70 Virginis

70 Virginis

70 Virginis system as rendered in Celestia
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Virgo
Right ascension 13h 28m 25.81s [1]
Declination +13° 46′ 43.6″ [1]
Apparent magnitude (V) +5.00
Characteristics
Spectral type G2.5Va
U−B color index 0.26
B−V color index 0.71
V−R color index 0.39
R−I color index 0.36
Variable type none
Astrometry
Radial velocity (Rv) 5 km/s
Proper motion (μ) RA: −236.02 ± 0.24 [1] mas/yr
Dec.: −575.73 ± 0.19 [1] mas/yr
Parallax (π) 55.60 ± 0.17[1] mas
Distance 58.7 ± 0.2 ly
(17.99 ± 0.05 pc)
Absolute magnitude (MV) +3.70 ± 0.01 [2]
Details
Mass 1.1 M☉
Radius 1.858 ± 0.124 [3] R☉
Surface gravity (log g) 3.58
Luminosity 3.06 L☉
Temperature 5770 K
Metallicity −0.03 [Fe/H]
Rotation unknown
Age 8.2 × 109 years
Other designations
HD 117176, HIP 65721, HR 5072, BD+14°2621, Gl 512.1, WDS 13284+1347A, and SAO 100582.
Database references
SIMBAD data
NStED data
ARICNS data
Extrasolar Planets
Encyclopaedia		 data

70 Virginis (abbreviated 70 Vir) is a yellow dwarf star approximately 59 light-years away[1] 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.[4] There is also a dust disc with a maximum temperature of 153 K located at a minimum distance of 3.4 AU from the star.[5]

Planetary system

The 70 Virginis system[5][6]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity
b >7.49 ± 0.61 MJ 0.484 ± 0.028 116.6884 ± 0.0044 0.4007 ± 0.0035
Dust disc >3.4 AU

References

  1. ^ a b c d e f van Leeuwen, F. (2007). "HIP 65721". Hipparcos, the New Reduction. http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/311/hip2&recno=65500. Retrieved 2009-12-08. 
  2. ^ Holmberg et al. (2009). "HD 117176". Geneva-Copenhagen Survey of Solar neighbourhood III. http://vizier.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=V/130/gcs3&recno=9191. Retrieved 2010-02-02. 
  3. ^ Gerard T. van Belle and Kaspar von Braun (2009). "Directly Determined Linear Radii and Effective Temperatures of Exoplanet Host Stars" (abstract). The Astrophysical Journal 694 (2): 1085–1098. Bibcode 2009ApJ...694.1085V. doi:10.1088/0004-637X/694/2/1085. http://www.iop.org/EJ/abstract/0004-637X/694/2/1085/.  (web Preprint)
  4. ^ Marcy, Geoffrey W; Butler, R. Paul (1996). "A Planetary Companion to 70 Virginis". The Astrophysical Journal Letters 464 (1): L147–L151. Bibcode 1996ApJ...464L.147M. doi:10.1086/310096. http://www.iop.org/EJ/article/1538-4357/464/2/L147/5040.html. 
  5. ^ a b Trilling et al.; Bryden, G.; Beichman, C. A.; Rieke, G. H.; Su, K. Y. L.; Stansberry, J. A.; Blaylock, M.; Stapelfeldt, K. R. et al. (2008). "Debris Disks around Sun-like Stars". The Astrophysical Journal 674 (2): 1086–1105. Bibcode 2008ApJ...674.1086T. doi:10.1086/525514. http://www.iop.org/EJ/article/0004-637X/674/2/1086/72640.html. 
  6. ^ Butler et al.; Wright, J. T.; Marcy, G. W.; Fischer, D. A.; Vogt, S. S.; Tinney, C. G.; Jones, H. R. A.; Carter, B. D. et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal 646 (1): 505–522. arXiv:astro-ph/0607493. Bibcode 2006ApJ...646..505B. doi:10.1086/504701. http://www.iop.org/EJ/article/0004-637X/646/1/505/64046.html. 

External links

Stars
Stars of Virgo
Bayer
Flamsteed
Nearby
Galaxy cluster

Coordinates: 13h 28m 25.8s, +13° 46′ 43.5″