HD 222109
Binary star system in the constellation Andromeda
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HD 222109 is a binary star system located in the northern constellation of Andromeda. It has a combined apparent visual magnitude of 5.80,[3] which allows it to be visible to the naked eye as a single star. The system has a combined spectral classification of B8V.[5] It is situated at a distance of approximately 800 light years from the Solar System,[2] and the two stars orbit each other with a period of 351.22 years. They are separated by a distance of 0.41″ and have an orbital eccentricity of 0.39.[4] Individually, the stars have apparent magnitudes of 6.08 and 7.38, respectively.[4]
Right ascension23h 37m 32.04280s[2]
Declination+44° 25′ 44.3723″[2]
Apparentmagnitude(V)5.80[3] (6.08 + 7.38)[4]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda[1] |
| Right ascension | 23h 37m 32.04280s[2] |
| Declination | +44° 25′ 44.3723″[2] |
| Apparent magnitude (V) | 5.80[3] (6.08 + 7.38)[4] |
| Characteristics | |
| Spectral type | B8V[5] |
| U−B color index | −0.32[3] |
| B−V color index | −0.06[3] |
| Astrometry | |
| Radial velocity (Rv) | −22.90±3.9[6] km/s |
| Proper motion (μ) | RA: 14.20±0.30[2] mas/yr Dec.: −17.63±0.45[2] mas/yr |
| Parallax (π) | 4.04±0.52 mas[2] |
| Distance | approx. 800 ly (approx. 250 pc) |
| Absolute magnitude (MV) | −1.12[1] |
| Orbit[7] | |
| Period (P) | 351.22 yr |
| Semi-major axis (a) | 0.41″ |
| Eccentricity (e) | 0.39 |
| Inclination (i) | 40.3° |
| Longitude of the node (Ω) | 157.1° |
| Periastron epoch (T) | B 2103.29 |
| Argument of periastron (ω) (secondary) | 0.0° |
| Details | |
| Mass | 2.9[8] M☉ |
| Surface gravity (log g) | 3.932±0.021[9] cgs |
| Temperature | 12,157±100[9] K |
| Rotational velocity (v sin i) | 158±13[9] km/s |
| Age | 54[8] Myr |
| Other designations | |
| BD+43°4508, HD 222109, HIP 116582, HR 8962, SAO 53202 | |
| Database references | |
| SIMBAD | data |
