| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Coma Berenices |
| Right ascension | 12h 30m 19.9101s[1] |
| Declination | +21° 56′ 53.6794″[1] |
| Apparent magnitude (V) | 7.71[2] |
| Characteristics | |
| Evolutionary stage | subgiant |
| Spectral type | K0III-IV[3] |
| B−Vcolor index | 0.99[4] |
| Astrometry | |
| Radial velocity (Rv) | −27.832 km/s |
| Proper motion (μ) | RA: −75.501mas/yr Dec.: −33.669mas/yr |
| Parallax (π) | 6.0417±0.0485 mas[5] |
| Distance | 540 ± 4 ly (166 ± 1 pc) |
| Orbit[6] | |
| Primary | HD 108863 |
| Companion | HD 108863 B |
| Semi-major axis (a) | 0.115" (16.065AU) |
| Details[2] | |
| Mass | 1.59 M☉ |
| Radius | 5.74 R☉ |
| Surface gravity (log g) | 3.07 cgs |
| Temperature | 4,878 K |
| Metallicity | 0.02[7] |
| Rotational velocity (v sin i) | 1.6±0.6[7] km/s |
| Age | 1.8±0.4[8] Gyr |
| Other designations | |
| BD+22 2478,Gaia DR2 3952692457305436800,HD 108863,HIP 61020,TYC 1447-2345-1,2MASS J12301991+2156537[1] | |
| Database references | |
| SIMBAD | data |
HD 108863 is asubgiant star, the primary of a binary star system540 light-years away, belonging tospectral class K0. Its age is younger than the Sun's at1.8±0.4 billion years.[8] The primary star is slightly enriched in heavy elements, having 115% of solar abundance.[7] The primary star does not have detectable flare activity.[9]
In 2014, a poorly characterized co-moving stellar companion HD 108863 B, likely amain sequence star of spectral class between F6 and G4, was discovered at a projected separation of 16.065AU.[6]
In 2011 onesuperjovian planet, HD 108863 b, on a nearly circular orbit around star HD 108863 was discovered utilizing theradial velocity method.[4] The planet does not transit its host star.[2]
| Companion (in order from star) | Mass | Semimajor axis (AU) | Orbital period (days) | Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| HD 108863 b | ≥2.6±0.2 MJ | 1.40±0.03 | 443.4±4.2 | <0.1 | — | — |
