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) +4.97[2]
Characteristics
Spectral type G4 V-IV[3]
U−B color index 0.26
B−V color index 0.714±0.007[2]
V−R color index 0.39
R−I color index 0.36
Variable type none
Astrometry
Radial velocity (Rv)4.44±0.13[2] 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
Distance58.7 ± 0.2 ly
(17.99 ± 0.05 pc)
Absolute magnitude (MV)+3.70±0.01[4]
Details
Mass1.12[5] M
Radius1.9±0.1[6] R
Luminosity2.92±0.03[7] L
Surface gravity (log g)3.58 cgs
Temperature5,406±64[7] K
Metallicity [Fe/H]−0.06[7] dex
Age7.9[7] Gyr
Other designations
70 Vir, BD+14°2621, GJ 512.1, HD 117176, HIP 65721, HR 5072, SAO 100582, WDS 13284+1347A
Database references
SIMBADdata
Exoplanet Archivedata
ARICNSdata
Extrasolar Planets
Encyclopaedia
data

70 Virginis (abbreviated 70 Vir) is the Flamsteed designation of 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.[8] 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.[9]

Planetary system[edit]

The discovery of the planet around 70 Virginis was announced on January 17, 1996 at the meeting of the American Astronomical Society in San Antonio, Texas; the planet was detected using radial velocity measurements taken with the C. Donald Shane telescope at Lick Observatory.[10][8]

The 70 Virginis planetary system[11]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b >7.40±0.02 MJ 0.481±0.003 116.6926±0.0014 0.399±0.002
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. ^ a b c Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015.
  3. ^ Strassmeier, K. G.; Ilyin, I.; Weber, M. (2017). "PEPSI deep spectra. II. Gaia benchmark stars and other M-K standards". arXiv:1712.06967 [astro-ph.EP].
  4. ^ Holmberg; et al. (2009). "HD 117176". Geneva-Copenhagen Survey of Solar neighbourhood III. Retrieved 2010-02-02.
  5. ^ 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
  6. ^ Gerard T. van Belle & 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)
  7. ^ a b c d Boyajian, Tabetha S.; et al. (July 2013), "Stellar Diameters and Temperatures. III. Main-sequence A, F, G, and K Stars: Additional High-precision Measurements and Empirical Relations", The Astrophysical Journal, 771 (1): 31, arXiv:1306.2974, Bibcode:2013ApJ...771...40B, doi:10.1088/0004-637X/771/1/40, 40. See Table 3.
  8. ^ a b 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.
  9. ^ 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.
  10. ^ Sanders, Robert (January 17, 1996). "Discovery of two new planets -- the second and third within the last three months -- proves they aren't rare in our galaxy" (Press release). University of California, Berkeley. Retrieved December 22, 2017.
  11. ^ Kane, Stephen R.; et al. (2015). "A Comprehensive Characterization of the 70 Virginis Planetary System". The Astrophysical Journal. 806. 60. arXiv:1504.04066. Bibcode:2015ApJ...806...60K. doi:10.1088/0004-637X/806/1/60.

External links[edit]

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