Lyrids 2004, Visual

Reports from only 21 observers have been received reporting
about the activity of the 2004 Lyrids. A first ZHR profile
was constructed from these data. The maximum time is near
April 22.0 and is a few hours earlier than the average maximum time of the last decade.

  
  ------------------------------------------------------  
  Date (UT) Time Solarlong nINT nLYR ZHR  
  ------------------------------------------------------  
  Apr 20.06 01:26 30.261 2 8 5 +- 2  
  Apr 21.09 02:10 31.267 2 11 16 +- 5  
  Apr 22.01 00:14 32.164 5 45 21 +- 3  
  Apr 22.07 01:41 32.223 6 51 16 +- 2  
  Apr 22.29 06:58 32.438 9 54 10 +- 1  
  Apr 23.00 00:00 33.130 19 80 7 +- 1  
  Apr 23.97 23:17 34.075 4 9 4 +- 1  
  Apr 25.00 00:00 35.079 2 2 4 +- 2  
  ------------------------------------------------------  
  

The ZHR was comuted by ZHR = nLYR*r^(6.5-LM)/(sin hR * Teff)
where r = 2.1, LM is the limiting magnitude, hR is the
radiant elevation and Teff is the effective observing time.

The data by the group from India delivered ZHRs which are
2-3 times higher than those of the other observers. They
have been excluded for this preliminary analysis.

The contributors are:

  
  ADEHA Harshil Adesara (India; not used)  
  BANAN Ana Bankovic (Serbia)  
  CERAN Ana Cernok (Serbia)  
  GLIGE George W. Gliba (USA)  
  KACJA Javor Kac (Slovenia)  
  KOTMA Marija Kotur (Serbia)  
  KULRI Rishikesh Kulkarni (India; not used)  
  MASMI Mikhail Maslov (Russia)  
  MILIV Ivan Milic (Serbia)  
  MISKO Koen Miskotte (Netherlands)  
  MOLSI Sirko Molau (Germany)  
  PAWNI Nikhil Pawar (India; not used)  
  PUNNI Nilesh Puntambekar (India; not used)  
  SAVBR Branislav Savic (Serbia)  
  STOWE Welsey Stone (USA)  
  TAIRI Richard Taibi (USA)  
  VANMC Michel Vandeputte (Belgium)  
  VELKR Kristina Veljkovic (Serbia)  
  VELVA Valentin Velkov (Bulgaria)  
  WEITH Thomas Weiland (Austria)  
  YOUKI Kim Youmans (USA)