70 Virginis

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70 Virginis
70 virginis.jpg
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 1.12[3] M
Radius 1.858 ± 0.124 [4] R
Luminosity 3.06 L
Surface gravity (log g) 3.58 cgs
Temperature 5770 K
Metallicity [Fe/H] −0.03 dex
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
Exoplanet Archive 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.[5] 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.[6]

Planetary system[edit]

The 70 Virginis planetary system[7]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b >7.49 ± 0.61 MJ 0.484 ± 0.028 116.6884 ± 0.0044 0.4007 ± 0.0035
Dust disc >3.4 AU

References[edit]

  1. ^ a b c d e f van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.  Vizier catalog entry
  2. ^ Holmberg et al. (2009). "HD 117176". Geneva-Copenhagen Survey of Solar neighbourhood III. Retrieved 2010-02-02. 
  3. ^ Shaya, Ed J.; Olling, Rob P. (January 2011), Very Wide Binaries and Other Comoving Stellar Companions: A Bayesian Analysis of the Hipparcos Catalogue, The Astrophysical Journal Supplement 192 (1): 2, arXiv:1007.0425, Bibcode:2011ApJS..192....2S, doi:10.1088/0067-0049/192/1/2 
  4. ^ 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. arXiv:0901.1206. Bibcode:2009ApJ...694.1085V. doi:10.1088/0004-637X/694/2/1085.  (web Preprint)
  5. ^ 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. 
  6. ^ Trilling, D. E. et al. (2008). "Debris Disks around Sun-like Stars". The Astrophysical Journal 674 (2): 1086–1105. arXiv:0710.5498. Bibcode:2008ApJ...674.1086T. doi:10.1086/525514. 
  7. ^ Butler, R. P. 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. 

External links[edit]

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