The 2007 Orionids from visual observations

Details The 2007 Orionids from visual observations The 2007 Orionids from visual observations

Jun 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jimo...36...55a&link_type=abstract

WGN, Journal of the International Meteor Organization, vol. 36, no. 3, p. 55-60

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Scientific paper

Following up on the enhanced activity of the 2006 Orionids, we present an analysis of the 2007 Orionids based on visual observations. A maximum activity of ZHR 80 +-5 meteors per hour is found at a solar longitude of 208.45 deg (eq. J2000.0) corresponding to about 2007 October 22, 08h UT. The peak was preceded by another maximum of 70+-4 meteors per hour near a solar longitude of 280.1 deg, corresponding to about 2007 October 22, 0h UT. The visual activity was a bit higher than in 2006 when ZHRs reached values near 60 meteor per hour. The population index was slightly below 2.0, while it went down to 1.6 in 2006. During the times of highest activity, the population index was 2.1 and 2.2, respectively. The maximum spatial number density was about 100 particles in a cube with edges of 1000 km length, which corresponds to a flux density of 0.024 particles per square kilometer per hour. The mass index was around 1.7 with 1.6 being the minimum value. Enhanced rates above the average pre-2006 profile were observed for a duration of at least 5 days. The enhanced rates in 2006 and 2007 are likely due to dust in 1:6 mean motion resonance with Jupiter, according to Sato & Watanabe (2007). The corresponding dust trails were laid down during perihelion passages of 1P/Hally 30-45 revolutions ago.

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