A GAIA Revised Oort Cloud Encounter with Gliese 710
American Journal of Astronomy and Astrophysics
Volume 4, Issue 6, November 2016, Pages: 83-88
Received: Oct. 27, 2016; Accepted: Nov. 9, 2016; Published: Dec. 12, 2016
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Martin Beech, Campion College, University of Regina, Regina, Canada; Department of Physics, University of Regina, Regina, Canada
Lowell Peltier, Department of Physics, University of Regina, Regina, Canada
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The encounter between Gliese 710 and the solar system is re-examined in light of the newly published parallax and proper motion measurements within the GAIA data 1 release. The up-dated astrometric parameters are found to be significantly different from those implicated by the earlier Hipparcos Catalog and the revised encounter will see GL 710 pass some 5 times closer to the Sun than previously indicated. The closest encounter distance is now found to be 0.064  0.020 pc at a time 1.36  0.12 million years from the present. There is now a 100% certainty that GL 710 will pass through the outer boundary of the Oort cloud, and it will possibly pass as close as 5200 AU to the Sun, indicating the potential for non-negligible gravitational perturbations of those cometary nuclei located close to the inner boundary of the Oort cloud. The revised encounter conditions indicate that a relatively strong cometary shower is likely within the inner solar system, although how this will modify the terrestrial impact probability remains unclear. We find that GL 710 might be expected to capture and accrete several thousands of cometary nuclei as it moves through the Oort cloud, and such impacts can be expected to drive anomalous flare activity. We additionally find that GL 710 will quite likely trigger sublimation-driven outgassing from cometary nuclei situated within a few astronomical units of its path across the Oort cloud.
Gliese 710, GAIA Data 1 Release, Flare Activity, Oort Cloud, Cometary Impacts
To cite this article
Martin Beech, Lowell Peltier, A GAIA Revised Oort Cloud Encounter with Gliese 710, American Journal of Astronomy and Astrophysics. Vol. 4, No. 6, 2016, pp. 83-88. doi: 10.11648/j.ajaa.20160406.13
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