Meteor Activity Outlook for April 10-16, 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 picks up a bit during April as two major showers are active during the month. The first of these, the Lyrids, are active from the 16th through the 25th, with a pronounced maximum on the 22nd. The Eta Aquariids start appearing near the 28th and reach maximum activity during the first week in May. Sporadic rates are low but steady as seen from the mid-northern hemisphere (45 N). Sporadic rates seen from the mid-southern hemisphere (45 S) rise this month toward a maximum in July.

During this period the moon reaches its new phase on Wednesday April 14th. At this time the moon lies near the sun and cannot be seen at night. This weekend the waning crescent moon will not cause any interference to meteor observers. The estimated total hourly rates for evening observers this week is ~3 for those in the northern hemisphere and ~4 for those south of the equator. For morning observers the estimated total hourly rates should be ~10 from the northern hemisphere and ~16 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.

The radiant positions and rates listed below are exact for Saturday night/Sunday morning April 10/11. 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:

Antihelions (ANT)

The wide Antihelion (ANT) radiant is now centered at 14:16 (214) -13. This area of the sky lies on the Virgo/Libra border, ten degrees west of the second magnitude star Zubenelgenubi (Alpha Librae). 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 eastern Hydra, Libra, or Virgo could be a candidate for this shower. Rates at this time should be near two per hour no matter your location. With an entry velocity of 30 km/sec., the average Antihelion meteor would be of medium-slow speed.

Zeta Cygnids (ZCG)

The team of Sirko Molau and Juergen Rendtel have discovered a weak radiant active at this time in the constellation of Cygnus. Video data shows that the Zeta Cygnids (ZCY) are active from March 27th through April 18th. Maximum activity occurs on the morning of April 6th. The radiant is currently located at 20:08 (302) +42. This position lies in central Cygnus, six degrees west of the second  magnitude star Sadr (Gamma Cygni). The radiant is best placed during the last dark hour before dawn, when it lies highest above the horizon in a dark sky. At 44km/sec. the Zeta Cygnids would produce meteors of medium velocity. Expected rates are near one per hour during the last dark hour before dawn. Due to the northerly declination, these meteors are not well seen from south of the equator.

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
ANT Antihelions          14h 16m  -13    30     1     2
ZCY Zeta Cygnids         20h 08m  +42    44     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

About Carl Hergenrother
I am a professional astronomer specializing in the study of comets, asteroids and meteors. This blog will focus on my professional and amateur work in this field

4 Responses to Meteor Activity Outlook for April 10-16, 2010

  1. debbie-lee says:

    hi – i was leaving work at about 6 / 6.30 ish on friday (16th april 2010) i saw what i believed at the time to be a meteor.
    pardon my ignorance, but i was wondering is there a specific area / country where they would be seen? I saw it in sunninghill jhb.
    what i saw was quite low, maybe about 6-10m upwards from where i was, it was an incredibly bright ‘comet’ shaped object, with quite a long tail. as it passed over my head it changed from blue to red and orange and then dissipated completely. At first i thought it could have been fireworks but it was silent and looked unlike anything i had ever seen before. could this have been a meteor?

    • Carl Hergenrother says:

      Hi Debbie-Lee,

      From your description, I sounds like you saw bright meteor (sometimes called a fireball) and a nice one too.

      Meteors (bright or faint) can be seen from anywhere in the world and at any times (even in bright daylight if the fireball is bright enough).

      Though the meteor can look like it is real close, they are usually very high in the sky (40-100 km up) and moving 10-70 km/s.

      Hope that helps,
      – Carl

  2. Dean Y says:

    Saw a large light green “fireball” going south easterly direction, early morning .
    My location is in Vernon BC. Was this the shuttle?it sure did not look like that to me.

    • Carl Hergenrother says:

      Hi Dean,

      That might have been the shuttle. Looks like the shuttle flew over your area at about 12:45 am GMT (5:45 am PDT)? Does that match the time you saw your “fireball”?

      The one time I saw the shuttle re-enter over Tucson, it was a brilliant red star followed by a ghostly white trail that eventually crossed the entire sky. The shuttle also moved much slower than any meteor I’d seen. It definitely ranks as one of the coolest sights that I’ve seen in the sky. Unfortunately once the Shuttle became dedicated to ISS missions, re-entries over the SW US have stopped.

      – Carl

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