| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Coma Berenices |
| Right ascension | 13h 12m 19.7427s |
| Declination | +17° 31′ 01.643″ |
| Apparent magnitude (V) | 7.30 |
| Distance | 132.3 ly (40.6 pc) |
| Spectral type | sdF9/sdM9 |
| Other designations | |
| Database references | |
| SIMBAD | data |
| NStED | data |
| ARICNS | data |
| Extrasolar Planets Encyclopaedia |
data |
HD 114762 is a binary star system approximately 132 light years away in the constellation Coma Berenices. It consists of a yellow-white main sequence star and a red dwarf companion approximately 130 AU apart. Both are low-metal subdwarfs. To see it, one needs a telescope or good binoculars.
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In 1989, a possible brown dwarf or planet was found orbiting HD 114762A by David Latham using Doppler spectroscopy.[1] This object wasn’t fully confirmed until 1996 by Geoffrey Marcy. If it is a planet it is one of the most massive found to date, at the very least 11 Jupiter masses. However, the mass will be known more accurately when the inclination is finally determined. This object is very likely to be a brown dwarf or less likely a red dwarf with upper-mass limit 145 Jupiter masses. It orbits at about the same mean distance and has about the same time of revolution around the central star as Mercury, although HD 114762 b's orbit is eccentric.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity |
|---|---|---|---|---|
| b | ≥11.68 ± 0.96 MJ | 0.363 ± 0.021 | 83.8881 ± 0.0086 | 0.3359 ± 0.0091 |