象限仪座流星雨的IMO分析报告已出

http://www.imo.net/news/quadrantids2006

Quadrantids 2006, visual

Visual observations of the 2006 Quadrantids received by the IMO before January 8 were used to provide a rough estimate of the 2006 activity of the meteor shower. A total of 303 Quadrantids seen during 34 hours of effective observing time were reported by 21 observers.

The maximum of the shower was lower than usual, with a ZHR of about 85 near January 3, 23h-24h or a solar longitude of 283.39 degrees (J2000.0). The expected maximum would have occurred at 18h20 UT on January 3. Only a single observer from Japan was able to report his data for that time (first line in below table) with a ZHR clearly below 100, too.

The number of individual observing periods is very small. The shape of the activity profile depends on the sampling of these data. The below table is not 'hand-picked' but still it is a selected one out of three different compu- ter-generated samplings. The selection is arbitrary; we can find out what happened only more additional data.

If you have not yet sent your report, please do so.

Jan (UT)  Solarlong  Nint  NQUA  ZHR  lm
03 19h00  283.1864  1  12  60.6 +- 16.8  5.40
03 20h10  283.2356  3  9  36.9 +- 11.7  5.42
03 22h00  283.3137  9  25  54.6 +- 10.7  5.62
03 23h00  283.3609  11  71  67.2 +- 7.9  5.56
03 23h40  283.3898  3  24  85.4 +- 17.1  5.74
04 02h30  283.5075  4  6  42.3 +- 16.0  4.72
04 03h10  283.5374  3  15  36.6 +- 9.2  5.33

We are grateful to Pierre Bader (Germany), Rohit Belapurkar (India), Sushrut Bhanushali (India), Charuta Deshpande (India), William Godley (USA), Lew Gramer (USA), Shy Halatzi (Israel), Manali Kulkarni (India), Omkar Kulkarni (India), Rhishikesh Kulkarni (India), Jens Lacorne (France), Alastair McBeath (UK), Tushar Purohit (India), Pulin Raje (India), Aaditya Ramdas (India), Trupti Ranka (India), Jurgen Rendtel (Germany), Rahul Sangole (India), Amit Shukrun (Israel), Shigeo Uchiyama (Japan), and Michel Vandeputte (Belgium) for their quick submission of the observing reports.

The Zenithal Hourly Rates (ZHR) were computed with an assumed population index of r=2, and a simple radiant elevation correction, 1/sin(hR). Solar longitudes refer to equinox J2000.0.