70 Virginis
From Wikipedia, the free encyclopedia
| Observation data Equinox J2000.0 |
|
|---|---|
| Constellation | Virgo |
| Right ascension | 13h 28m 25.8s |
| Declination | +13° 46′ 43.5″ |
| Apparent magnitude (V) | +4.98 |
| Characteristics | |
| Spectral type | G2.5Va |
| U-B color index | 0.26 |
| B-V color index | 0.71 |
| Variable type | none |
| Astrometry | |
| Radial velocity (Rv) | 5 km/s |
| Proper motion (μ) | RA: −234.81 mas/yr Dec.: −576.19 mas/yr |
| Parallax (π) | 55.22 ± 0.73 mas |
| Distance | 59.1 ly (18.1 pc) |
| Absolute magnitude (MV) | 3.68 |
| Details | |
| Mass | 1.1 M☉ |
| Radius | 1.76 R☉ |
| Luminosity | 3.06 L☉ |
| Temperature | 5770 K |
| Metallicity | −0.03 [Fe/H] |
| Rotation | ? |
| Age | 8200 million years |
| Other designations | |
| Database references | |
| SIMBAD | data |
70 Virginis is a yellow dwarf star approximately 59 light-years away in the constellation Virgo. It is rather unusually bright for its spectral type and may be just starting to evolve into the subgiant phase.
In 1996, 70 Virginis was discovered to have an extrasolar planet in orbit around it.[1]
[edit] 70 Virginis b
| Extrasolar planet | Lists of extrasolar planets | |
|---|---|---|
| Orbital elements | ||
| Semimajor axis | (a) | 0.484 ± 0.028 AU |
| Eccentricity | (e) | 0.4007 ± 0.0035 |
| Orbital period | (P) | 116.6884 ± 0.0044 d |
| Inclination | (i) | ° |
| Longitude of periastron |
(ω) | 358.71 ± 0.54° |
| Time of periastron | (τ) | 2,447,239.82 ± 0.21 JD |
| Physical characteristics | ||
| Mass | (m) | >7.49 ± 0.61 MJ |
| Radius | (r) | ? RJ |
| Density | (ρ) | ? kg/m3 |
| Temperature | (T) | ? K |
| Discovery information | ||
| Discovery date | 1996 | |
| Discoverer(s) | Marcy, Butler | |
| Detection method | Doppler Spectroscopy | |
| Discovery status | Confirmed | |
70 Virignis b is an eccentric Jupiter type extrasolar planet which orbits its sun every 116 days. At the time of discovery, 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). 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.[3]
[edit] References
- ^ G. Marcy et al. (1996). "A Planetary Companion to 70 Virginis". The Astrophysical Journal 464: L147-L151.
- ^ Butler, R. et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal 646: 505 – 522. (web Preprint)
- ^ 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.
[edit] External links
- SIMBAD: HD 117176 -- High proper-motion Star
- SolStation: 70 Virginis
- Extrasolar Planets Encyclopaedia: 70 Virginis + 70 Virginis b
- Extrasolar Visions: 70 Virginis + 70 Virginis b
 |
This main sequence star-related article is a stub. You can help Wikipedia by expanding it. |
 |
This extrasolar planet related article is a stub. You can help Wikipedia by expanding it. |
