HD 222109
HD 222109 is a binary star system located in the northern constellation of Andromeda. It has a combined apparent visual magnitude of 5.80, which allows it to be visible to the naked eye as a single star. The system has a combined spectral classification of B8V. It is situated at a distance of approximately 800 light years from the Solar System, 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. Individually, the stars have apparent magnitudes of 6.08 and 7.38, respectively.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda |
| Right ascension | 23h 37m 32.04280s |
| Declination | +44° 25′ 44.3723″ |
| Apparent magnitude (V) | 5.80 (6.08 + 7.38) |
| Characteristics | |
| Spectral type | B8V |
| U−B color index | -0.32 |
| B−V color index | -0.06 |
| Astrometry | |
| Radial velocity (Rv) | −22.90±3.9 km/s |
| Proper motion (μ) | RA: 14.20±0.30 mas/yr Dec.: −17.63±0.45 mas/yr |
| Parallax (π) | 4.04 ± 0.52 mas |
| Distance | approx. 800 ly (approx. 250 pc) |
| Orbit | |
| 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 M☉ |
| Surface gravity (log g) | 3.932±0.021 cgs |
| Temperature | 12,157±100 K |
| Rotational velocity (v sin i) | 158±13 km/s |
| Age | 54 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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