Van Biesbroeck 8
Epoch J2000.0 Equinox J2000.0 (ICRS)
|Right ascension||16h 55m 28.755s|
|Declination||−08° 20′ 10.84″|
|Apparent magnitude (V)||9.048|
|U−B color index||16.7|
|B−V color index||18.7|
|Proper motion (μ)||RA: 3.160889 mas/yr
Dec.: -7.84639 mas/yr
|Parallax (π)||154.96 ± 0.52 mas|
|Distance||21.05 ± 0.07 ly
(6.45 ± 0.02 pc)
|Absolute magnitude (MV)||17.75|
Van Biesbroeck 8 (vB 8, Gliese 644 C) is a low-luminosity star in the constellation Ophiuchus, cataloged in the 20th century (in 1961) by the astronomer George Van Biesbroeck. It is the smallest, faintest, and most separated component of the quintuple star system Gliese 644/643 — the richest stellar system in the immediate solar neighbourhood (d<10pc). Classified as a red dwarf star, it is approximately 18.7 light years from our solar system and possesses about 9% of the mass of the Sun. In 1984, apparently erroneous information led to the belief that the first extra-solar "planet" (later deemed to possibly be a brown dwarf) was orbiting Van Biewsbroeck 8. The object, termed Van Biesbroeck 8b, was twice confirmed, but subsequent attempts to locate it were unsuccessful.
- THE ONE HUNDRED NEAREST STAR SYSTEMS brought to you by RECONS (Research Consortium On Nearby Stars)
- Mazeh, Tsevi; Latham, David W.; Goldberg, Elad; Torres, Guillermo; Stefanik, Robert P.; Henry, Todd J.; Zucker, Shay; Gnat, Orly; Ofek, Eran O. (2001). "Studies of multiple stellar systems - IV. The triple-lined spectroscopic system Gliese 644". Monthly Notices of the Royal Astronomical Society 325: 343–357. arXiv:astro-ph/0102451. Bibcode:2001MNRAS.325..343M. doi:10.1046/j.1365-8711.2001.04419.x.
- Ségransan, D.; Delfosse, X.; Forveille, T.; Beuzit, J.-L.; Udry, S.; Perrier, C.; Mayor, M. (2000). "Accurate masses of very low mass stars. III. 16 new or improved masses". Astronomy and Astrophysics 364: 665–673. arXiv:astro-ph/0010585. Bibcode:2000A&A...364..665S.
- Van Biesbroeck 8 The Encyclopedia of Astrobiology, Astronomy and Spaceflight
- Van Biesbroeck 8 http://simbad.u-strasbg.fr
- Van Biesbroeck 8 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
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