Dec 15/16/17/18 Meteors
December 18, 2009 1 Comment
Meteor rates continue to be elevated. Though the Geminids are now history for 2009, a number of minor showers are displaying an impressive amount of activity. In particular, the December Leonis Minorids are producing between 10 and 25% of the nightly total. It will be interesting to see if this shower remains active over the next few days.
From Bob’s note for the night of Dec 15/16 : “There was scattered cirrus at dusk last night. Conditions were still good enough for video observations. Unfortunately conditions quickly deteriorated and thicker cirrus prevented the recording of any activity between 0400 and 0900 UT (8pm-1am PST). Conditions improved during the remainder of the morning allowing the recording of some activity before dawn arrived.”
… for the night of Dec 16/17 : “The cirrus was less widespread than yesterday. It was more prevalent during the evening hours and then cleared during the morning hours. It’s puzzling to see the dip in rates between 11-12 UT when it was mostly clear. It’s also surprising not to see any Antihelions prior to midnight, as the radiant is high in the sky.”
… and for the night of Dec 17/18 : “The cirrus clouds were back tonight with vengeance. It was mostly cloudy until 11UT (3am PST). The next hour seemed to be totally clear and then clouds interfered again the next hour. The last 46 minutes had mostly clear skies again. The new “COM’s” have been a disappointment. They are supposed to be slightly weaker than the “DLM’s” but the difference to me is striking with the “DLM’s” being the far stronger shower. Note that my first Ursid was detected tonight.”
Obs Date(UT) Time TOT SPO ANT GEM HYD MON DLM DAD COM URS TUS 2009-12-18 12h 12m 36 13 2 - 5 4 9 - 2 1 SDG 2009-12-18 11h 55m 33 23 4 - 2 1 2 - 0 1 TUS 2009-12-17 12h 12m 48 29 2 0 1 1 9 - 3 2 SDG 2009-12-17 12h 00m 64 47 4 - 4 1 7 - 1 0 TUS 2009-12-16 12h 06m 13 4 2 3 2 0 0 - 2 - SDG 2009-12-16 11h 58m 32 23 2 2 1 1 2 1 0 - 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) ANT - Antihelions GEM - Geminids HYD - Sigma Hydrids MON - Monocerotids DLM - December Leonis Minorids DAD - December Alpha Draconids COM - Coma Berenicids URS - Ursid