HD 101930
| HD 101930 | |
|---|---|
|
|
|
Observation data for epoch J2000.0 |
|
| Constellation | centaur |
| Right ascension | 11 h 43 m 30 s |
| declination | −58 ° 0 ′ 24 ″ |
| Apparent brightness | 8.21 |
| Known exoplanets | 1 |
| Characteristics | |
| Spectral class | K1V |
| BV color index | 0.908 |
| Astrometry | |
| Proper movement |
RA : 15.00 mas / year Dec. : 347.49 mas / year |
| parallax | 32.79 mas |
| distance | 99.45 light years |
| Details | |
| Dimensions | 0.74 M ☉ |
| radius | 0.93 R ☉ |
| Luminosity | 0.49 L ☉ |
| Surface temperature : | 5079 K (approx. 4806 ° C ) |
| Metallicity ( Fe / H ) | 0.17 |
| Rotation time | 46 days |
| Age | 5.39 billion years |
| Other names | |
| CD -57 ° 4096, HIP 57172, SAO 239322, GJ 3683 | |
HD 101930 is a star system in the constellation Centaur almost 100 light-years away . HD 101930 consists of a main sequence star of the spectral class K1, which is orbited by a red dwarf ( HD 101930 B ) and an exoplanet ( HD 101930 b ). The main sequence star and the red dwarf form a wide binary star system with an angular distance of 73 "(approx. 2200 AU).
The surface temperature of the main component is about 5000 K lower than that of the sun and it is a little less bright and smaller than our central star . Because of this, the star is expected to be around 25 billion years old.
HD 101930 b
HD 101930 b is the name of the exoplanet orbiting the central star. It is the only exoplanet so far that could be detected in this star system. It accompanies the main component at a distance of about 0.3 astronomical units and takes about 70 days to orbit it. The exoplanet has at least 0.3 times the mass of Jupiter ; based on this, it is assumed that it is a gas planet . The exoplanet was discovered within the HARPS project using the radial velocity method. The discovery was published in 2005 by Christophe Lovis, Michel Mayor , Francesco Pepe, and others.
Web links
- Entry in the Encyclopedia of extrasolar planets (English)
- Entry in SIMBAD database (English)