NO DEATH STAR - FOR NOW

Authors
Citation
Ja. Frogel et A. Gould, NO DEATH STAR - FOR NOW, The Astrophysical journal, 499(2), 1998, pp. 219-222
Citations number
21
Categorie Soggetti
Astronomy & Astrophysics
Journal title
ISSN journal
0004637X
Volume
499
Issue
2
Year of publication
1998
Part
2
Pages
219 - 222
Database
ISI
SICI code
0004-637X(1998)499:2<219:>2.0.ZU;2-O
Abstract
A star passing within similar to 10(4) AU of the Sun would trigger a c omet shower that would reach the inner solar system about 0.18 Myr lat er. We calculate an a priori probability of similar to 0.4% that a sta r has passed this close to the Sun but that the comet shower has not y et reached the Earth. We search the Hipparcos catalogue for such recen t close-encounter candidates and, in agreement with Garcia-Sanchez et al., find none. The new result reported in this Letter is an estimatio n of the completeness of the search. Because of the relatively bright completeness limit of the catalogue itself, V similar to 8, the search is sensitive to only about half the stars that could have had such a near encounter. On the other hand, we show that the search is sensitiv e to nearly all of the past encounters that would lead to a major show er in the future and conclude that it is highly unlikely that one will occur during the next 0.5 Myr.