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© Torben Krogh & Mogens Winther,
(Amtsgymnasiet and EUC Syd Gallery,
student photo used with permission)
107 Piscium is an orange-red dwarf
star, like Epsilon Eridani at left
center of meteor. (See a Digitized
Sky Survey field image of 107
Piscium from the Nearby Stars Database.)
This star is located about 24.4 light-years (ly) away from our Sun, Sol. It lies in the northeastern part (01:42:29.76+20:16:06.62, ICRS 2000.0) of Constellation Pisces, the Fish -- northwest of Sheratan (Beta Arietis) and southeast of the Triangulum Galaxy (M33).
107 Piscium is a orange-red main sequence dwarf star of spectral and luminosity type K1 V. The star has about 89 percent of Sol's mass, 80 to 86 percent of its diameter (Perrin and Karoji, 1987, page 236; and Johnson and Wright, 1983, page 649), and about 37 percent of its luminosity . It appears to be about 63 percent as enriched as Sol with elements heavier than hydrogen ("metallicity"), based on its abundance of iron (Cayrel de Strobel et al, 1991, page 278). 107 Piscium has the New Suspected Variable designation NSV 600 and possibly two optical companions. Useful star catalogue numbers for 107 Piscium include: 107 Psc, HR 493, Gl 68, Hip 7981, HD 10476, BD+19 279, SAO 74883, LHS 1287, LTT 10596, and LFT 153.
Hunt for Substellar Companions
The failure, thus far, to find large substellar objects like brown dwarfs or a Jupiter- or Saturn-class planet in a "torch" orbit (closer han the Mercury to Sun distance) around 107 Piscium -- with even the highly sensitive radial-velocity technique of Geoffrey W. Marcy and R. Paul Butler -- bodes well for the possibility of Earth-type terrestrial planets around this star (Cumming et al, 1999). Indeed, the distance from 107 Piscium where an Earth-type planet would be "comfortable" with liquid water is centered around only 0.62 AU -- between the orbital distances of Mercury and Venus in the Solar System. At that distance from the star, such a planet would have an orbital period of about 202 days -- less than two thirds of an Earth year. Astronomers would find it very difficult to detect using present methods.
The following star systems are located within 10 light-years of 107 Piscium.
|Star System||Spectra &|
|L 1157-47||M V||5.4|
|LP 469-206||M V||5.6|
|AC+25 7918||M3 V||6.5|
|LP 469-67||M V||7.0|
|Gliese 105 ABC||K3 V |
|BD+04 123||K1-2 V||8.4|
|L 1305-10||M4-6 V||9.5|
Up-to-date technical summaries on these stars can be found at: the Astronomiches Rechen-Institut at Heidelberg's ARICNS, the Nearb Stars Database, and the Research Consortium on Nearby Stars (RECONS). Additional information may be available at Roger Wilcox's Internet Stellar Database.
Constellation Pisces (the Fish) is faint but can be found along the celestial equator swimming north of Aquarius (the Water Bearer) and Cetus (the Whale or Sea Monster) and surrounded by Pegasus, Andromeda, Triangulum, and Aries. According to Greek mythology, Aphrodite and her son Eros turned into fish (commemorated as the Northern and Southern Fishes of Pisces) and jumped into a river in Egypt to escape from Typhon, who sought to overthrow Zeus and his group of gods. For more information on the constellation and an illustration, go to Christine Kronberg's Pisces. For another illustration, see David Haworth's Pisces.
For more information about stars including spectral and luminosity class codes, go to ChView's webpage on The Stars of the Milky Way.
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