We present the report of Quadrantids 2004 visual data totaled by the Nippon Meteor Society
We used the visual data that was contributed until 10th Jan. 2004 to the mailing list of meteor observers and researcher in Japan (NMS-ML) and direct e-mail.
Adopted data is personal observation, radiant height >15deg, limiting magnitude>4.1mag. and clouds <40%.
Zenithal hourly rate(ZHR), which are we visible meteors on the ideal condition, is calculated from reported data by using luminous index = 2.5 and radiant height correction = 1/sin(RP.H) that based on the method of International Meteor Organization(IMO).
<Err.> on the table means ZHR division by square root of total meteor number.
The Chart of Quadrantids 2003 Activity
Daily Activity
Result per Day Month day Nind. Teff QUA HRave ZHRave Err. ----------------------------------------------- 12 27/28 2 2.0 5 2.5 5.5 2.5 12 28/29 1 1.0 2 2.0 6.7 4.7 12 29/30 2 2.0 6 3.0 6.8 2.8 12 30/31 0 0 0 - - - 1 31/ 1 2 2.3 8 3.5 8.7 3.1 1 1/ 2 2 4.5 17 3.8 15.6 3.8 1 2/ 3 4 5.2 58 11.2 27.8 3.7 1 3/ 4 17 27.7 812 29.3 104.3 3.7 1 4/ 5 1 4.0 70 17.5 53.9 6.4
Result per Hour
Month day hr Nobs Teff QUA HRave ZHRave Err.
-----------------------------------------------
1 4 1 3 3.3 51 15.5 102.1 14.3
1 4 2 6 5.7 77 13.5 95.5 10.9
1 4 3 10 9.2 213 23.2 104.3 7.1
1 4 4 20 17.7 533 30.1 103.5 4.5
1 4 5 18 14.8 521 35.2 102.2 4.5
1 4 6 6 4.3 202 47 110.4 7.8
Total Observing Time: 48.7 hr
Total Observations: 978 meteors (QUA)
Observers: 11 persons