HD 76700
Star in the constellation Volans
From Wikipedia, the free encyclopedia
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 197 light years from the Sun based on stellar parallax.[1] It is drifting further away with a radial velocity of +39 km/s.[2]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Volans |
| Right ascension | 08h 53m 55.5161s[1] |
| Declination | −66° 48′ 03.576″[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: −282.929(47) mas/yr[1] Dec.: 120.479(43) mas/yr[1] |
| Parallax (π) | 16.5671±0.0387 mas[1] |
| Distance | 196.9 ± 0.5 ly (60.4 ± 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 | |
| CD−66°656, HD 76700, HIP 43686, SAO 250370, LTT 3291, NLTT 20555, 2MASS J08535550-6648034[5] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
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 system
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 |