70 Virginis b
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| Extrasolar planet | List of extrasolar planets | |
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| Parent star | ||
| Star | 70 Virginis | |
| Constellation | Virgo | |
| Right ascension | (α) | 13h 28m 25.8s |
| Declination | (δ) | +13° 46′ 43.5″ |
| Apparent magnitude | (mV) | 5 |
| Distance | 59.1 ly (18.1 pc) |
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| Spectral type | G2.5Va | |
| Orbital elements | ||
| Semimajor axis | (a) | 0.484 ± 0.028 AU |
| Eccentricity | (e) | 0.4007 ± 0.0035 |
| Orbital period | (P) | 116.6884 ± 0.0044 d |
| Argument of periastron |
(ω) | 358.71 ± 0.54° |
| Time of periastron | (T0) | 2,447,239.82 ± 0.21 JD |
| Semi-amplitude | (K) | 316.3 ± 1.7 m/s |
| Physical characteristics | ||
| Minimum mass | (m sin i) | 7.49 ± 0.61 MJ |
| Discovery information | ||
| Discovery date | 17 January 1996 | |
| Discoverer(s) | Geoffrey Marcy R. Paul Butler |
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| Detection method | Doppler Spectroscopy | |
| Discovery site |  United States |
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| Discovery status | Confirmed | |
| Other designations | ||
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HD 117176 b, HR 5072 b, "Goldilocks"
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| Database references | ||
| Extrasolar Planets Encyclopaedia |
data | |
| SIMBAD | data | |
70 Virginis b is an extrasolar planet approximately 60 light-years away in the constellation of Virgo. Announced in 1996 by Geoffrey Marcy and R. Paul Butler, 70 Virginis was one of the first stars confirmed to have planets orbiting it. When first announced, 70 Virginis b was considered to be within its star's habitable zone (preferably in the "Goldilocks zone"), but would later be confirmed that the planet has an eccentric orbit, closer to its parent.
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[edit] Characteristics
70 Virginis b is an eccentric Jupiter type extrasolar planet which orbits its sun every 116 days with 7.5 times the mass of Jupiter. Its surface Gravity must be about two - three times that of Jupiter's. At the time of discovery in January 1996, it was believed that the star was only 29 ly away resulting in the star being less luminous based on its apparent magnitude. As a result the planet's orbit was thought to be in the habitable zone and the planet was nicknamed Goldilocks (not too cold or too hot).[1] The Hipparcos satellite later showed that the star was more distant and therefore brighter resulting in the planet being too hot to be in the habitable zone.[2]
[edit] See also
[edit] References
- ^ Powell, Corey (1996-05-27). "A Parade of New Planets". Scientific American. http://www.sciam.com/article.cfm?articleID=000BAF7C-7457-1C76-9B81809EC588EF21. Retrieved on 2007-05-13.
- ^ Perryman, M. A. C., et al. (1996). "Hipparcos distances and mass limits for the planetary candidates: 47 Ursae Majoris, 70 Virginis, 51 Pegasi". Astron. Astrophys. 310: L21–L24. http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996A%26A...310L..21P&link_type=ARTICLE&db_key=AST&high=41f529900e10089.
[edit] External links
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