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Dynamics of the Oort Cloud In the Gaia Era I: Close Encounters
- Source :
- Astrometry and Astrophysics in the Gaia Sky, 269-270. IAU, ISSUE=12;STARTPAGE=269;ENDPAGE=270;TITLE=Astrometry and Astrophysics in the Gaia Sky
- Publication Year :
- 2017
- Publisher :
- Cambridge University Press (CUP), 2017.
-
Abstract
- Comets in the Oort cloud evolve under the influence of internal and external perturbations from giant planets to stellar passages, the Galactic tides, and the interstellar medium.Using the positions, parallaxes and proper motions from TGAS in Gaia DR1 and combining them with the radial velocities from the RAVE-DR5, Geneva-Copenhagen and Pulkovo catalogues, we calculated the closest encounters the Sun has had with other stars in the recent past and will have in the near future. We find that the stars with high proper motions near to the present time are missing in the Gaia-TGAS, and those to tend to be the closest ones. The quality of the data allows putting better constraints on the encounter parameters, compared to previous surveys.
- Subjects :
- Physics
Solar System
010504 meteorology & atmospheric sciences
business.industry
Astronomy and Astrophysics
Cloud computing
Astrophysics::Cosmology and Extragalactic Astrophysics
01 natural sciences
Astrobiology
Space and Planetary Science
Dynamics (music)
0103 physical sciences
Astrophysics::Solar and Stellar Astrophysics
Astrophysics::Earth and Planetary Astrophysics
business
010303 astronomy & astrophysics
Astrophysics::Galaxy Astrophysics
0105 earth and related environmental sciences
Subjects
Details
- ISSN :
- 17439221 and 17439213
- Volume :
- 12
- Database :
- OpenAIRE
- Journal :
- Proceedings of the International Astronomical Union
- Accession number :
- edsair.doi.dedup.....44b780e54dfbbf2aeee33a8821087111