The Last Orbital Period Of "new Comets"

Details The Last Orbital Period Of "new Comets" The Last Orbital Period Of "new Comets"

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.0505f&link_type=abstract

American Astronomical Society, DPS meeting #42, #5.05; Bulletin of the American Astronomical Society, Vol. 42, p.950

Astronomy and Astrophysics

Astronomy

Scientific paper

The question of the Oort cloud shape, size and even existence is becoming a more and more decisive question for the origin of "new" comets.
We have studied the effects of stars and tides during the very last orbital period of fictitious comets entering an observable region defined by
heliocentric distance smaller than 5 AU. It appears that, depending on the semi-major axis of the injected comets at injection, a synergy is
at work between the tidal effects and the stellar perturbations. More precisely, the stellar perturbations allow the tides to inject
comets at smaller semi-major axis than when the tides alone are at work. Considering only the stars which could have been observed by
the HIPPAROCS satellite, it appears that the number of injected comets is less than 20% of the total flux for semi-major axis smaller than 25 000 AU.
On the contrary, the stars which could be observed by the future GAIA mission will allow to obtain more than 80% of the total flux for
semi-major axis smaller than 40 000 AU and more than 90% for semi-major axis smaller than 25 000 AU.
In conclusion, because the stellar perturbations allow to inject comet at smaller semi-major axis than with only the tides, our view of the Oort cloud size and population may change.
We have also shown that it is hopeless to perform a backward integration over one orbital period of the known "new comets" in order to estimate this size since
our knowledge of the stellar neighborhood of the Sun is still too incomplete. However, future spatial mission like GAIA may fill this gap and allow us to perform such a study.
MF is grateful to PNP 2010 for financial support.

Affiliated with

Also associated with

No associations

Rating

The Last Orbital Period Of "new Comets" does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The Last Orbital Period Of "new Comets", we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Last Orbital Period Of "new Comets" will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1121200