December Monocerotids and November Orionids are weak but established annual meteor showers active throughout November and December. Analysis of a high quality orbits subset of the SonotaCo video meteor data base shows that the distribution of orbital elements, geocentric velocity and also the orbital evolution of the meteors and potential parent body may imply a common origin for these meteors coming from the parent comet C/1917 F1 Mellish. This is also confirmed by the physical properties and activity of these shower meteors. An assumed release of meteoroids at the perihelion of the comet in the past and the sky-plane radiant distribution reveal that the December Monocerotid stream might be younger than the November Orionids. A meteoroid transversal component of ejection velocity at the perihelion must be larger than 100 m s-1. A few authors have also associated December Canis Minorids with the comet C/1917 F1 Mellish. However, we did not find any connection.
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- March 2011
- celestial mechanics;
- individual: C/1917 F1 Mellish;
- Astrophysics - Earth and Planetary Astrophysics;
- 11 pages, 11 figures and 5 tables