Geminids 2007: analyses of the observations
Abstract
The DMS Geminid-campaign was very successful with nearly 6000 Geminids observed in Teff = 84.6 hours. Maximum activity remained above 100 Geminids per hour for almost the entire night of December 13/14 and possibly in the early evening of December 14. As expected this shower peaked around mid-day of December 14. The decrease of in activity during the night of December 14/15 was compensated by an increased number of bright meteors. The calculated population index r showed a minimum value of approximately 2.1$, against 2.6 early that night and on December 13/14, close to the normal value. ZHRs were calculated with gamma = 1 instead of the normally used value of 1.4, this time. Because the Geminids showed a plateau in activity during the night of December 13/14, using gamma = 1.4 would `overestimate' the ZHR-values in the early evening hours because of the low altitude of the radiant (Fig. 4). Using gamma = 1.4 would in fact show a small decrease of activity, contradictory to the peak observed on December 14 by the IMO.
- Publication:
-
WGN, Journal of the International Meteor Organization
- Pub Date:
- October 2008
- Bibcode:
- 2008JIMO...36..105J