The 1995 outburst and possible origin of the alpha-Monocerotid meteoroid stream

Astronomy and Astrophysics – Astronomy

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Celestial Mechanics, Stellar Dynamics, Comets: Individual: C/1943 W1, Meteors, Meteoroids

Scientific paper

A short-duration outburst of the alpha-Monocerotids was observed on 1995 November 22 between 01:15 and 01:45 UT. The highest equivalent zenithal hourly rate (EZHR) occurred in the 5-min interval 01:25-01:30 UT, reaching a value of 420+/-50. The peak time derived from the available data is 1995 November 22, 01:28 UT+/-3 min, or lambda_solar=239.˚320+/-0.˚002 (J2000). The FWHM of the peak as derived from a Gaussian fit to the rate profile amounts to 0.˚016 in solar longitude or 22 min. The population index, r, is found from visual magnitude estimates to be r=2.36+/-0.17. The radiant for the shower has been determined from video observations to be alpha=117 deg+/-3 deg, delta=+1 deg+/-2 deg. The potential orbits associated with this radiant for plausible entry velocities suggest that the shower is not associated with C/1943 W1 (Van Gent-Peltier-Daimaca or 1944 I) as first suggested by Kresak. The most probable parent is a small comet with a 10-yr period and a node very near the Earth.

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