Astronomy:HD 76700
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Volans |
| Right ascension | 08h 53m 55.5159s[1] |
| Declination | −66° 48′ 03.5743″[1] |
| Apparent magnitude (V) | 8.16[2] |
| Characteristics | |
| Spectral type | G6V[3] |
| B−V color index | 0.745±0.010[2] |
| Astrometry | |
| Radial velocity (Rv) | +38.90±1.46[2] km/s |
| Proper motion (μ) | RA: −282.828±0.056[1] mas/yr Dec.: +120.362±0.056[1] mas/yr |
| Parallax (π) | 16.3960 ± 0.0314[1] mas |
| Distance | 198.9 ± 0.4 ly (61.0 ± 0.1 pc) |
| Absolute magnitude (MV) | 4.26[2] |
| Details[4] | |
| Mass | 1.10±0.02 M☉ |
| Radius | 1.34±0.03 R☉ |
| Luminosity | 1.69±0.01 L☉ |
| Surface gravity (log g) | 4.22±0.03 cgs |
| Temperature | 5,694±44 K |
| Metallicity [Fe/H] | +0.31±0.02[2] dex |
| Age | 6.9±0.8 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia | data |
HD 76700 is a star in the southern constellation of Volans. It is yellow in hue and is too faint to be visible to the naked eye, having an apparent visual magnitude of 8.16.[2] This object is located at a distance of 199 light years from the Sun based on stellar parallax.[1] It is drifting further away with a radial velocity of +39 km/s.[2]
Properties
This object is a G-type main-sequence star with a stellar classification of G6V,[3] which indicates it is generating energy through core hydrogen fusion. It is a metal-enriched star, showing a much higher metallicity than the Sun.[6] This may be explained by prior accretion of refractory-rich planetary bodies into the stellar atmosphere.[7] The mass of HD 76700 is very similar to (1.1 times) that of the Sun, but it is cooler and brighter (with an effective temperature of 5,694 K and luminosity of 1.69 Suns) and thus much older—around 6.9 billion years old.[4]
Planetary
HD 76700 is orbited by a giant planet that was discovered in 2003 via the radial velocity method.[6] Designated HD 76700 b, this planet is orbiting very close to the star with a period of just four days.[8]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥ 0.23 MJ | 0.0511±0.0030[9] | 3.97101±0.00020 | 0.0616+0.0426 −0.0587 |
— | 0.99 RJ |
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 Houk, Nancy; Cowley, A. P. (1979). Michigan catalogue of two-dimensional spectral types for the HD stars. 1. Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan. Bibcode: 1978mcts.book.....H.
- ↑ 4.0 4.1 Bonfanti, A. et al. (2015). "Revising the ages of planet-hosting stars". Astronomy & Astrophysics 575 (A18): 17. doi:10.1051/0004-6361/201424951. Bibcode: 2015A&A...575A..18B.
- ↑ "HD 76700". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+76700.
- ↑ 6.0 6.1 Tinney, C. G. et al. (2003). "Four New Planets Orbiting Metal-enriched Stars". The Astrophysical Journal 587 (1): 423–428. doi:10.1086/368068. Bibcode: 2003ApJ...587..423T.
- ↑ Schuler, Simon C. et al. (May 2011). "Abundances of Stars with Planets: Trends with Condensation Temperature". The Astrophysical Journal 732 (1): 15. doi:10.1088/0004-637X/732/1/55. 55. Bibcode: 2011ApJ...732...55S.
- ↑ 8.0 8.1 Wang, Ji; Ford, Eric B. (December 2011). "On the eccentricity distribution of short-period single-planet systems". Monthly Notices of the Royal Astronomical Society 418 (3): 1822–1833. doi:10.1111/j.1365-2966.2011.19600.x. Bibcode: 2011MNRAS.418.1822W.
- ↑ Butler, R. P. et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal 646 (1): 505–522. doi:10.1086/504701. Bibcode: 2006ApJ...646..505B.
Coordinates: 
08h 53m 55.5153s, −66° 48′ 03.571″
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