Oct 23-30 Meteors

The last week of October witnessed a gradual decrease in meteor rates. Much of the slow-down was due to the Orionids being past their peak. Also the Taurids are past their peak as well.

Obs  Date(UT)      Time    TOT SPO NTA STA ORI EGE LMI SSA OUI ETT BCN
TUS  2011-10-30   10h 40m   30  21  2   2   4   -   -   -   -   1   0
TUS  2011-10-29   04h 38m   25  13  0   4   8   -   -   -   -   0   0
TUS  2011-10-28   09h 30m   43  17  5   3   15  -   -   -   1   1   1
TUS  2011-10-27   09h 52m   64  23  1   5   31  2   1   -   0   2   0
TUS  2011-10-26   11h 16m   52  17  1   2   25  3   1   -   0   0   3
TUS  2011-10-25   09h 52m   54  16  1   4   28  1   2   -   0   0   2
TUS  2011-10-24   10h 41m   66  19  2   3   38  2   0   1   0   1   -
TUS  2011-10-23   10h 05m   66  18  1   3   43  0   1   0   0   -   -

SAL3 - SALSA3 camera in Tucson (Carl Hergenrother)
ALLS - Near all-sky camera in Tucson (Carl Hergenrother)
VIST - Visual observations from Tucson (Carl Hergenrother)
VISH - Visual observations from Hermosillo (Salvador Aguirre)
HERM - PARENI camera in Hermosillo (Salvador Aguirre)
SDG - Camera in San Diego operated by Bob Lunsford
Time - Total amount of time each camera looked for meteors
TOT - Total number of meteors detected
SPO - Sporadics (meteors not affiliated with any particular meteor shower)
NTA - Northern Taurids 
STA - Southern Taurids 
ORI - Orionids 
EGE - Epsilon Geminids 
LMI - Leo Minorids
SSA - Sigma Arietids
OUI - October Ursa Minorids
ETT - Eta Taurids
BCN - Beta Cancrids

Meteor Activity Outlook for October 29-November 4, 2011

The following is a slightly edited version of Bob Lunsford’s excellent weekly summary of meteor activity. The original version can be found at the American Meteor Society’s site.

As seen from the northern hemisphere, meteor rates continue to be strong in November. While no major activity is expected this month, the two Taurid radiants plus the Leonids keep the skies active. The addition of strong sporadic rates make November one of the better months to view meteor activity from north of the equator. Skies are fairly quiet as seen from the southern hemisphere this month. Activity from the three showers mentioned above may be seen from south of the equator, but the sporadic rates are much lower than those seen in the northern hemisphere.

During this period the moon reaches its first quarter phase on Wednesday November 2nd. At this time the moon will lie ninety degrees east of the sun and will set near midnight local daylight time (LDT). This weekend the waxing crescent moon will set during the early evening hours and will not interfere with meteor observing during the more active morning hours. The estimated total hourly rates for evening observers this week is near four as seen from the northern hemisphere and three as seen from the southern hemisphere. For morning observers the estimated total hourly rates should be near eighteen as seen from mid-northern latitudes and thirteen from mid-southern latitudes. The actual rates will also depend on factors such as personal light and motion perception, local weather conditions, alertness and experience in watching meteor activity. Evening rates are reduced this week due to moonlight.

The radiant (the area of the sky where meteors appear to shoot from) positions and rates listed below are exact for Saturday night/Sunday morning October 29/30. These positions do not change greatly day to day so the listed coordinates may be used during this entire period.

The following showers are expected to be active this week:

The Northern Taurids (NTA) are active from a large radiant centered at 03:12 (048) +21, which lies in eastern Aries, very close to the position of the fourth magnitude star Delta Arietis. The radiant is best placed near 0200 LDT, when it lies highest above the horizon. Meteors from the Northern Taurids strike the atmosphere at 29km/sec., which would produce meteors of slow velocity. Expected rates would be near two per hour, no matter your location.

The center of the Southern Taurid (STA) radiant now lies 03:15 (049) +12. This position lies in southeastern Aries, eight degrees south of the fourth magnitude star Delta Arietis The radiant is best placed near the meridian at 0200 LDT, but activity may be seen all night long. Striking the atmosphere at 29 km/sec., the average Southern Taurid meteor travels slowly through the skies. Rates should be near two per hour no matter your location.

A new radiant has been discovered in Taurus which is active during this period. The Eta Taurids (ETT) are active from October 24 through November 3, with maximum occurring on the 24th. The radiant position currently lies at 04:04 (061) +24, which lies in western Taurus, four degrees east of the famous Pleiades star cluster. The radiant is best placed near 0300 LDT, when it lies highest above the horizon. Meteors from the Eta Taurids strike the atmosphere at 47km/sec., which would produce meteors of average velocity. Expected rates would be less than one per hour, no matter your location.

The Orionids (ORI) have now passed maximum and hourly rates are now falling with each passing night. Rates are expected to be less than five per hour this week. The radiant is currently located at 06:49 (102) +16. This position lies in southern Gemini, two degrees southeast of the second magnitude star Alhena (Gamma Geminorum). The radiant is best placed near 0500 LDT, when it lies highest above the horizon. At 67km/sec., the average Orionid is swift.

Recent studies by Sirko Molau and Juergen Rendtel have revealed a radiant in Canis Minor that is active this time of year. Old radiant positions placed it within the borders of Cancer. The Beta Cancrids (BCN) are active from October 25 through November 3, with maximum occurring on the 27th. The radiant position currently lies at 07:32 (113) -03, which lies in central Canis Minor, five degrees south of the brilliant zero magnitude star Procyon (Alpha Canis Minoris. The radiant is best placed near 0600 LDT, when it lies highest above the horizon. Meteors from the Beta Cancrids strike the atmosphere at 65km/sec., which would produce meteors of swift velocity. Expected rates would be less than one per hour, no matter your location.

As seen from the mid-northern hemisphere (45N) one would expect to see approximately ten sporadic meteors per hour during the last hour before dawn as seen from rural observing sites. Evening rates would be near three per hour. As seen from the mid-southern hemisphere (45S), morning rates would be near five per hour as seen from rural observing sites and two per hour during the evening hours. Locations between these two extremes would see activity between the listed figures.

The list below presents a condensed version of the expected activity this week. Rates and positions are exact for Saturday night/Sunday morning.

Shower Name                 RA     DEC   Vel     Rates
                                         km/s   NH    SH
NTA Northern Taurids      03h 12m  +21    29     2     2
STA Southern Taurids      03h 15m  +12    27     2     2 
ETT Eta Taurids           04h 04m  +24    47    <1    <1 
ORI Orionids              06h 49m  +16    61     3     3
BCN Beta Cancrids         07h 32m  -03    65    <1    <1

RA - Right Ascension
DEC - Declination
Vel - Velocity relative to Earth (in km per sec)
Rates - Rate of visible meteors per hour from a dark site
NH - Northern Hemisphere
SH - Southern Hemisphere

Meteor Activity Outlook for October 12-28, 2011

Sorry, I’m a few days late posting this…

The following is a slightly edited version of Bob Lunsford’s excellent weekly summary of meteor activity. The original version can be found at the American Meteor Society’s site.

Meteor activity in general increases in October when compared to September. A major shower (the Orionids) is active most of the month along with many minor showers. Both branches of the Taurids become more active as the month progresses, providing slow, graceful meteors to the nighttime scene. The Orionids are the big story of the month reaching maximum activity on the 22nd. This display can be seen equally well from both hemispheres which definitely helps out observers located in the sporadic-poor southern hemisphere this time of year.

During this period the moon reaches its new phase on Wednesday October 26th. At this time the moon will lie near the sun and will be invisible at night. This weekend the waning crescent moon will rise during the late morning hours and will not interfere with meteor observing. The estimated total hourly rates for evening observers this week is near four as seen from the northern hemisphere and three as seen from the southern hemisphere. For morning observers the estimated total hourly rates should be near thirty three as seen from mid-northern latitudes and twenty eight from mid-southern latitudes. The actual rates will also depend on factors such as personal light and motion perception, local weather conditions, alertness and experience in watching meteor activity.

The radiant (the area of the sky where meteors appear to shoot from) positions and rates listed below are exact for Saturday night/Sunday morning October 22/23. These positions do not change greatly day to day so the listed coordinates may be used during this entire period.

The following showers are expected to be active this week:

A new radiant has been discovered by Sirko Molau and Juergen Rendtel in Draco which is active during this period. The October Ursa Minorids (OUI) are active from October 16-28, with maximum occurring on the 24th. The current radiant position lies at 18:18 (275) +75. This position lies in eastern Draco two degrees north of the faint star Chi Draconis. Older radiant positions were a bit further west in Ursa Minor.  The radiant is best placed just as soon as it becomes dark, when it lies highest in a dark sky. Meteors from the October Ursa Minorids strike the atmosphere at 28km/sec., which would produce meteors of slow velocity. Expected rates would be less than one per hour, as seen from the northern hemisphere. Activity from this shower is not visible in the southern hemisphere due to the high northerly location of the radiant.

The Northern Taurids (NTA) are now active from a large radiant centered at 02:48 (042) +20, which lies in central Aries, six degrees west of the fourth magnitude star Delta Arietis. The radiant is best placed near 0200 local daylight time (LDT), when it lies highest above the horizon. Meteors from the Northern Taurids strike the atmosphere at 29km/sec., which would produce meteors of slow velocity. Expected rates would be near two per hour, no matter your location.

The center of the Southern Taurid (STA) radiant now lies 02:51 (043) +11. This position lies on the Aries/Cetus border, three degrees east of the fourth magnitude star Mu Ceti. The radiant is best placed near the meridian at 0200 LDT, but activity may be seen all night long. Striking the atmosphere at 29 km/sec., the average Southern Taurid meteor travels slowly through the skies. Rates should be near two per hour no matter your location.

A new radiant has been discovered in Taurus which is active during this period. The Eta Taurids (ETT) are active from October 24 through November 3, with maximum occurring on the 24th. At maximum, the  radiant position lies at 03:42 (056) +24, which lies in western Taurus in the area of sky occupied by the famous Pleiades star cluster. The radiant is best placed near 0300 LDT, when it lies highest above the horizon. Meteors from the Eta Taurids strike the atmosphere at 47km/sec., which would produce meteors of average velocity. Expected rates would be less than one per hour, no matter your location.

The Orionids (ORI) reach maximum activity on morning of October 22nd. Rates are expected to peak between 10-20 shower members per hour on that morning. Moonlight from the waning crescent moon will reduce activity slightly. The radiant is currently located at 06:28 (97) +16. This position lies in western Gemini, close to the second magnitude star Alhena (Gamma Geminorum). The radiant is best placed near 0500 LDT, when it lies highest above the horizon. At 67km/sec., the average Orionid is swift.

The Epsilon Geminids (EGE) are active from October 16th through the 27th. Maximum activity occurred on the 19th. The radiant is currently located at 07:02 (105) +27. This position lies in central Gemini, three degrees northeast of the third magnitude star Epsilon Geminorum. This position is also close to the Orionid radiant so care must taken for correct shower association, especially since they have similar velocities. The Orionids will be more numerous. Current rates are near one per hour. The radiant is best placed near 0600 LDT, when it lies highest above the horizon. At 70km/sec., the average Epsilon Geminid is swift.

Recent studies by Sirko Molau and Juergen Rendtel have revealed a radiant in Canis Minor that is active this time of year. Old radiant positions placed it within the borders of Cancer. The Beta Cancrids (BCN) are active from October 25 through November 3, with maximum occurring on the 27th. The radiant position at maximum lies at 07:22 (111) -06, which lies in southwestern Canis Minor, three degrees west of the brilliant zero magnitude star Procyon (Alpha Canis Minoris. The radiant is best placed near 0600 LDT, when it lies highest above the horizon.Meteors from the Beta Cancrids strike the atmosphere at 65km/sec., which would produce meteors of swift velocity. Expected rates would be less than one per hour, no matter your location.

The Leonis Minorids (LMI) are active from October 16-27 with maximum activity occurring on October 23rd. ZHR’s are usually low but the radiant is far removed from the Orionids and Epsilon Geminids so that any possible shower members should be easily identified. Hourly rates should be near one this weekend. This radiant is currently located at 10:43 (161) +36, which places it in northeastern Leo Minor, two degrees east of the fourth magnitude star Beta Leonis Minoris . The radiant is best placed just before dawn when it lies highest in a dark sky. This shower is better situated for observers situated in the northern hemisphere where the radiant rises far higher into the sky before the start of morning twilight. At 60km/sec., the average Leonis Minorid is swift.

As seen from the mid-northern hemisphere (45N) one would expect to see approximately ten sporadic meteors per hour during the last hour before dawn as seen from rural observing sites. Evening rates would be near three per hour. As seen from the mid-southern hemisphere (45S), morning rates would be near five per hour as seen from rural observing sites and two per hour during the evening hours. Locations between these two extremes would see activity between the listed figures.

The list below presents a condensed version of the expected activity this week. Rates and positions are exact for Saturday night/Sunday morning.

Shower Name                 RA     DEC   Vel     Rates
                                         km/s   NH    SH
OUI Oct Ursa Minorids     18h 18m  +75    28    <1    <1
NTA Northern Taurids      02h 48m  +20    29     2     2
STA Southern Taurids      02h 51m  +11    27     2     2 
ETT Eta Taurids           03h 42m  +24    47    <1    <1 
ORI Orionids              06h 28m  +16    61    15    15
EGE Epsilon Geminids      07h 02m  +27    70     1     1
BCN Beta Cancrids         07h 22m  -06    65    <1    <1
LMI Leo Minorids          10h 43m  +36    60     2     2

RA - Right Ascension
DEC - Declination
Vel - Velocity relative to Earth (in km per sec)
Rates - Rate of visible meteors per hour from a dark site
NH - Northern Hemisphere
SH - Southern Hemisphere

Meteor Activity Outlook for October 30-November 5, 2010

The Meteor Activity Outlook is a weekly summary of expected meteor activity written by Robert Lunsford, Operations Manager of the American Meteor Society and contributor to this blog. The original unedited version of this week’s Meteor Activity Outlook can be found at the American Meteor Society’s site.

As seen from the northern hemisphere, meteor rates continue to be strong in November. While no major activity is expected this month, the two Taurid radiants plus the Leonids keep the skies active. The addition of strong sporadic rates make November one of the better months to view meteor activity from north of the equator. Skies are fairly quiet as seen from the southern hemisphere this month. Activity from the three showers mentioned above may be seen from south of the equator, but the sporadic rates are much lower than those seen in the northern hemisphere.

During this period the moon wanes from its last quarter phase to nearly new at the end of the period. This weekend the half illuminated last quarter moon will rise near 0100 LDT (Local Daylight Time) and will remain in the sky the remainder of the night. While the moon at this phase is still bright, it is nowhere as bright as the full moon encountered the previous week. Successful meteor observations can be undertaken by simply keeping the moon far from your field of view. The observing situation improves further as the week progresses as the moon wanes and rises later and later during the morning hours. The estimated total hourly rates for evening observers this week is near six from the northern hemisphere and three for observers south of the equator. For morning observers the estimated total hourly rates should be near twenty from the northern hemisphere and twelve as seen from the southern hemisphere. The actual rates will also depend on factors such as personal light and motion perception, local weather conditions, alertness and experience in watching meteor activity. Morning rates are reduced this week due to lunar interference.

The radiant (the area of the sky where meteors appear to shoot from) positions and rates listed below are exact for Saturday night/Sunday morning October 30/31. These positions do not change greatly day to day so the listed coordinates may be used during this entire period.

The following showers are expected to be active this week:

Northern Taurids (NTA)

The center of the large Northern Taurid (NTA) radiant lies at 03:12 (048) +21. This area of the sky is located in eastern Aries, ten degrees southwest of the famous naked eye open cluster known as the Pleiades. The radiant is best placed near 0200 local daylight time (LDT), when it lies highest above the horizon. This shower peaks on November 13, so rates are slowly increasing. Current rates would be near two per hour, no matter your location. Meteors from the Northern Taurids strike the atmosphere at 29km/sec., which would produce meteors of slow velocity. This shower is also responsible for many of the fireball reports seen in November.

Southern Taurids (STA)

The center of the large Southern Taurid (STA) radiant lies at 03:16 (049) +12. This area of the sky is located in eastern Aries, fifteen degrees southwest of the Pleiades. The radiant is also best placed near the meridian near 0200 LDT. We are now well past the October 10 maximum for this shower but rates will still remain near two per hour, no matter your location. Striking the atmosphere at 29 km/sec., the average Southern Taurid meteor travels slowly through the skies. This shower is also responsible for many of the fireball reports seen in October.

Eta Taurids (ETT)

Studies of the IMO video database by Sirko Molau and Juergen Rendtel has revealed a radiant located in Taurus this time of year. The Eta Taurids (ETT) are active from October 25 through November 3, with maximum occurring on October 25th. The current radiant position lies at 04:04 (061) +24, which lies in western Taurus, three degrees east of the Pleiades star cluster. The radiant is best placed near 0300 LDT, when it lies highest above the horizon. Meteors from the Eta Taurids strike the atmosphere at 47km/sec., which would produce meteors of average velocity. Expected rates would be less than one per hour, no matter your location.

Orionids (ORI)

The Orionids (ORI) reached maximum activity on October 22nd. Some activity may still be seen during the morning hours from a radiant located at 06:48 (102) +16. This position lies in southwestern Gemini, close to the second magnitude star Alhena (Gamma Geminorum). The radiant is best placed on the meridian near 0500 LDT. Current rates should be near three per hour no matter your location. At 67km/sec., the average Orionid is swift.

Beta Cancrids (BCN)

Another shower derived from the IMO video database is the Beta Cancrids (BCN). This shower is active from October 25-November 3 with a peak on the 27th. This shower has been known from visual observations for some time. Video analysis have confirmed the activity but from a slightly different portion of the sky. The radiant was suspected to be active from the Cancer/Gemini border when in fact the position actually lies in the constellation of Monoceros, to the south. The radiant is located at 07:32 (113) -10, which is fifteen degrees south of the brilliant zero magnitude star Procyon (Alpha Canis Minoris). The radiant is best placed during the last dark hour before dawn when it lies highest above the horizon in a dark sky. Rates should less than one per hour. With an entry velocity of 65 km/sec., most activity from this radiant would be swift.

Shower Name                 RA     DEC   Vel     Rates
                                         km/s   NH    SH
NTA Northern Taurids      02h 28m  +18    29     1     1
STA Southern Taurids      01h 20m  +06    30     2     2
ETT Eta Taurids           04h 04m  +24    47    <1    <1
ORI Orionids              06h 08m  +16    67     3     3
BCN Beta Cancrids         07h 32m  -10    65    <1    <1

RA - Right Ascension
DEC - Declination
Vel - Velocity relative to Earth (in km per sec)
Rates - Rate of visible meteors per hour from a
        dark site
NH - Northern Hemisphere
SH - Southern Hemisphere

Meteor Activity Outlook for October 23-29, 2010

The Meteor Activity Outlook is a weekly summary of expected meteor activity written by Robert Lunsford, Operations Manager of the American Meteor Society and contributor to this blog. The original unedited version of this week’s Meteor Activity Outlook can be found at the American Meteor Society’s site.

Meteor activity in general increases in October when compared to September. A major shower (the Orionids) is active most of the month along with several minor showers. Both branches of the Taurids become more active as the month progresses, providing slow, graceful meteors to the nighttime scene. The Orionids are usually the big story of the month but this year the Orionid peak coincides with the full moon, which will severely reduce the number of meteors seen. Orionid activity can be seen before and after maximum when the moon is not so troublesome. Unfortunately on these nights the Orionid rates will be low, most likely less than five per hour.

During this period the moon is full on the 23rd and wanes toward last quarter, which is reached on the 30th. The bright moon will make observing meteors difficult as only the brightest ones can be seen in the lunar glare. Those viewing under transparent skies will have better success as the moonlight will be less scattered. The estimated total hourly rates for evening observers this week is near four from the northern hemisphere and two for observers south of the equator. For morning observers the estimated total hourly rates should be near twelve from the northern hemisphere and nine as seen from the southern hemisphere. The actual rates will also depend on factors such as personal light and motion perception, local weather conditions, alertness and experience in watching meteor activity. Rates are reduced this week due to lunar interference.

The radiant (the area of the sky where meteors appear to shoot from) positions and rates listed below are exact for Saturday night/Sunday morning October 23/24. These positions do not change greatly day to day so the listed coordinates may be used during this entire period.

The following showers are expected to be active this week. The detailed descriptions will be continued next week when the moonlight is not as intense.

Shower Name                 RA     DEC   Vel     Rates
                                         km/s   NH    SH
OUI October Ursa Minorids 18h 12m  +74    28    <1    <1
NTA Northern Taurids      02h 52m  +20    29     1    <1
STA Southern Taurids      02h 32m  +11    30     2     2
ETT Eta Taurids           04h 00m  +24    47    <1    <1
ORI Orionids              06h 32m  +16    67     5     5
EGE Epsilon Geminids      07h 04m  +27    70    <1    <1
BCN Beta Cancrids         07h 12m  -03    65    <1    <1
LMI Leonis Minorids       10h 48m  +36    60    <1    <1

RA - Right Ascension
DEC - Declination
Vel - Velocity relative to Earth (in km per sec)
Rates - Rate of visible meteors per hour from a
        dark site
NH - Northern Hemisphere
SH - Southern Hemisphere

Meteor Activity Outlook for August 7-13, 2010

The Meteor Activity Outlook is a weekly summary of expected meteor activity written by Robert Lunsford, Operations Manager of the American Meteor Society and contributor to this blog. The original unedited version of this week’s Meteor Activity Outlook can be found at the American Meteor Society’s site.

Meteor activity kicks into high gear in August as seen from the northern hemisphere. The main reason for this activity surge is the Perseid shower that peaks on August 13. This shower is active most of the month and remains above the level of the sporadic background for a week centered on August 13. The sporadic activity is also increasing as seen from the northern hemisphere and is now nearly double the rates from just three months ago. As seen from south of the equator, meteor rates are still decent but falling rapidly. The sporadic rates seen at the beginning of the month will be twice as high as those seen during the last days of the month. The Perseid radiant does not rise high into the sky as seen in the southern hemisphere so rates from this shower are greatly reduced when compared to the northern hemisphere.

During this period the moon reaches its new phase on Tuesday August 10th. At this time the moon will be located near the sun and is not visible at night. This weekend the waning crescent moon will not cause any trouble for morning observers. The estimated total hourly rates for evening observers this week is ~4 no matter your location. For morning observers the estimated total hourly rates should be ~24 from the northern hemisphere and ~21 as seen from the southern hemisphere. The actual rates will also depend on factors such as personal light and motion perception, local weather conditions, alertness and experience in watching meteor activity. During this period, moonlight reduces activity seen during the morning hours.

The radiant positions and rates listed below are exact for Saturday night/Sunday morning August 7/8. These positions do not change greatly day to day so the listed coordinates may be used during this entire period.

The following showers are expected to be active this week:

August Draconids (AUG)

Activity from the August Draconids (AUD) can be first detected near August 11th from a radiant located at 18:00 (270) +61. This position lies in southern Draco, close to the second magnitude star Eltanin (Gamma Draconis). Maximum activity is not predicted until August 21st so current rates would be low, <1 per night. With an entry velocity of 23 km/sec. most of these meteors will appear to move slowly. The radiant is best placed near 2200 Local Daylight Time (10pm LDT) when it lies highest in the sky. Due to its high northern declination this shower is not well seen from the southern hemisphere.

Kappa Cygnids (KCG)

The Kappa Cygnids (KCG) are active from a wide radiant located at 18:50 (282) +47. This position is further south than previous publications. It has been updated through the use of video observations by the International Meteor Organization. The new location lies on the Lyra/Draco border, eight degrees northwest of the brilliant star Vega (Alpha Lyrae). Maximum activity is now predicted to occur on August 14th. Current rates would be 1 per hour from the northern hemisphere and <1 shower member per hour from south of the equator. With an entry velocity of 23 km/sec. most of these meteors will appear to travel slower than average. The radiant is best placed near 2300 LDT (11pm LDT) when it lies nearly overhead for much of the Northern Hemisphere. Due to its high northern declination this activity is not well seen from the southern hemisphere.

Alpha Capricornids (CAP)

The Alpha Capricornids (CAP) are active from a wide radiant located at 20:45 (311) -07. This position lies in western Aquarius near the faint star 3 Aquarii. The radiant is best placed near 0100 local daylight time (LDT), when it lies on the meridian and is highest in the sky. Current rates should be ~1 per hour no matter your location. Don’t confuse these meteors with the antihelion meteors, which have a radiant just to the east. Both radiants need to be in your field of view to properly sort these meteors. With an entry velocity of 25 km/sec., most activity from this radiant would be slow, a bit slower than the antihelions. This radiant is well seen except for far northern latitudes where it remains twilight all night long and the radiant does not rise as high into their sky.

Antihelions (ANT)

The wide Antihelion (ANT) radiant is now centered at 21:52 (328) -11. This area of the sky lies in northeastern Capricornus, 4 degrees northeast of Deneb Algedi (Delta Capricornii). This radiant is best placed near 0200 local daylight time (LDT) when it lies on the meridian and is located highest in the sky. Due to the large size of this radiant, any meteor radiating from northwestern Piscis Austrinus, Microscopium, Capricornus, western Aquarius, or southeastern Aquila could be a candidate for this shower. Rates at this time should be ~2 per hour as seen from the northern hemisphere and ~3 per hour as seen from south of the equator. With an entry velocity of 30 km/sec., the average Antihelion meteor would be of medium-slow speed.

Delta Aquariids (SDA)

The Delta Aquariids (SDA) reach maximum activity on Friday July 30th. The shower is still active from a radiant located at 23:12 (348) -14. This position lies in central Aquarius, 4 degrees northeast of the 3rd magnitude star Delta Aquarii. The radiant is best placed near 0300 LDT, when it lies highest in the sky. The optimal latitudes for viewing this shower lie in the southern tropics where the radiant passes overhead. With an entry velocity of 42 km/sec., most activity from this radiant would be of average velocities. Expect rates of 1 per hour north of the equator and 2 per hour from the southern hemisphere.

August Piscids (AUP)

A new shower discovered by Sirko Molau and Juergen Rendtel from the IMO’s video database are the August Piscids (AUP). This shower is only active on eight nights from August 2-9 with maximum activity occurring on the 4th. At maximum, the radiant is located at 00:44 (011) +19. This area of the sky is located in northern Pisces, 10 degrees north of the 4th magnitude star Delta Piscium. This radiant is best placed during the last hour before dawn when it lies highest in a dark sky. Hourly rates are expected to be <1. With an entry velocity of 66 km/sec., the average August Piscid meteor would be swift.

Perseids (PER)

The Perseids (PER) are active from a radiant located at 02:44 (041) +56. This position lies in northwestern Perseus very close to the 4th magnitude star Eta Persei. The radiant is best placed during the last hour before the start of morning twilight when it lies highest in a dark sky. Current rates would be ~5 per hour but this will swell to ~60 per hour at maximum activity on the mornings of the 12th and 13th. The latest predictions have the Earth encountering a trail of debris produced by comet 109P/Swift-Tuttle in the year 441 AD. This very old trail is not expected to produce an outburst but should enhance rates by 10-15 meteors per hour near 1200 Universal Time (05:00am PDT) on the 13th. Activity from the Perseids is not visible south of 40 degrees south latitude. With an entry velocity of 61 km/sec., most activity from this radiant would be swift.

Eridanids (ERI)

A second new shower discovered by Sirko Molau and Juergen Rendtel from the IMO’s video database are the Eridanids (ERI). This shower is active from August 4th through the 18th with maximum activity occurring on the 9th. Hourly rates could reach near two per hour at maximum. The radiant is currently located at 02:50 (042) -11. This area of the sky is located in extreme eastern Cetus about a dozen degrees south of Phycochroma (Delta Ceti). This radiant could account for the activity many observers have reported (including myself) this time of year from this portion of the sky. This radiant is best placed during the last hour before dawn when it lies highest in a dark sky. Hourly rates are expected to be <1. With an entry velocity of 64 km/sec., the average Eridanid meteor would be swift.

Beta Perseids (BPE)

Still another new shower discovered by Sirko Molau and Juergen Rendtel from the IMO’s video database are the Beta Perseids (BPE). This shower is active from August 4th through the 15th with maximum activity occurring on the 7th. Hourly rates are expected to remain low throughout this duration. The radiant is currently located at 03:02 (046) +40. This position lies only one degree southwest of the famous eclipsing variable star known as Algol (Beta Persei). This radiant has been suspected for many years and may have also been known as the Alpha-Beta Perseids. This radiant is best placed during the last hour before dawn when it lies highest in a dark sky. Hourly rates are expected to be <1. With an entry velocity of 67 km/sec., the average Beta Perseid meteor would be swift.

As seen from the mid-northern hemisphere (45N) one would expect to see approximately five sporadic meteors per hour during the last hour before dawn as seen from rural observing sites. Evening rates would be near two per hour. As seen from the mid-southern hemisphere (45S), morning rates would be near fourteen per hour as seen from rural observing sites and three per hour during the evening hours. Locations between these two extremes would see activity between the listed figures. Morning rates are slightly reduced due to moonlight.

The list below presents a condensed version of the expected activity this week. Rates and positions are exact for Saturday night/Sunday morning.

Shower Name                RA     DEC   Vel     Rates
                                        km/s   NH    SH
AUG August Draconids     18h 00m  +61    23    <1    <1
KCG Kappa Cygnids        18h 50m  +47    23     1    <1
CAP Alpha Capricornids   20h 45m  -07    25     1     1
ANT Antihelions          21h 52m  -11    30     2     3
SDA Delta Aquariids      23h 12m  -14    42     1     2
AUP August Piscids       00h 44m  +19    66    <1    <1
PER Perseids             00h 44m  +51    61     3     2
ERI Eridanids            02h 50m  -11    64     2     2
BPE Beta Perseids        03h 02m  +40    67    <1    <1

RA - Right Ascension
DEC - Declination
Vel - Velocity relative to Earth (in km per sec)
Rates - Rate of visible meteors per hour from a
        dark site
NH - Northern Hemisphere
SH - Southern Hemisphere

Oct 28/29 to Nov 2/3 Meteors

This is a big catch-up post. The fall months usually see the highest meteor rates of the year and this year is no exception. Even though the Orionids are 2 weeks past their peak they are still producing more meteors per hour than any other currently active shower. This should change this week as the Orionids move towards inactivity. The 2 branches of the Taurid stream are nearing their maximum and will produce a consistent, though minor, contribution to November’s meteor rates. Surprisingly, the Beta Cancrids are still doing well which isn’t bad for a minor shower that we know little about. The nearly Full Moon has become a problem and will suppress meteor rates for the rest of the week.

Bob’s notes for the night of Oct 28/29 : “There was a thin veil of cirrus throughout the night that reduced the number of meteors recorded. The waxing gibbous further brightened the sky while it was above the horizon. Nothing notable in the shower numbers seen last night.”

Oct 29/30 : “The thin high clouds continued all night long again. Rates were similar to the previous night.”

Oct 30/31 : “The thin high clouds finally moved out of the area leaving pristine skies. A bright gibbous moon had less effect under the transparent conditions.”

Oct 31/Nov 1 and Nov 1/2 : “Clear skies and a bright moon were present both nights. Nothing notable was observed except for a few bright meteors.”

Nov 2/3 : “There were occasional high clouds last night which seemed to have affected the meteor rates more than the full moon.”

Obs Date (UT)  TotTime TOT SPO NTA STA ORI BCN ETT
TUS 2009-11-03 09h 10m  21  10  2   0   3   4   2
SDG 2009-11-03 11h 13m  27  17  1   4   3   2   0
TUS 2009-11-02 11h 28m  19  13  2   0   3   1   0
SDG 2009-11-02 08h 03m  52  38  2   3   8   1   0
TUS 2009-11-01 11h 26m  46  23  4   4   8   6   1
SDG 2009-11-01 11h 12m  60  35  3   6   12  2   2
TUS 2009-10-31 11h 24m  46  20  5   4   14  3   0
SDG 2009-10-31 11h 12m  61  35  5   4   14  2   1
TUS 2009-10-30 11h 23m  37  14  4   1   11  6   0
SDG 2009-10-30 10h 41m  44  21  4   4   13  1   1
TUS 2009-10-29 11h 20m  37  17  2   1   23  0   0
SDG 2009-10-29 11h 15m  48  27  4   3   11  2   1

TUS – Camera in Tucson operated by Carl Hergenrother
SDG – Camera in San Diego operated by Bob Lunsford
TotTime – Total amount of time each camera looked for meteors
TOT – Total number of meteors detected
SPO – Sporadics (meteors not affiliated with any particular meteor shower)
NTA/STA – Northern and Southern Taurids (includes Antihelions)
ORI – Orionids
OUI – October Ursae Minorids
BCN – Beta Cancrids
ETT – Eta Taurids