2 Andromedae
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Andromeda |
| Right ascension | 23h 02m 36.38s |
| Declination | +42° 45′ 28.1″ |
| Apparent magnitude (V) | 5.093 |
| Characteristics | |
| Spectral type | A3Vn |
| U−B color index | 0.11 |
| B−V color index | 0.09 |
| Astrometry | |
| 2 Andromedae A | |
| Radial velocity (Rv) | 2 km/s |
| Proper motion (μ) |
RA: 56.38 ± 0.30 mas/yr Dec.: −4.47 ± 0.38 mas/yr |
| Parallax (π) | 7.74 ± 0.51mas |
| Distance | 420 ± 30 ly (129 ± 9 pc) |
| Absolute magnitude (MV) | −0.39±0.16 |
| 2 Andromedae B | |
| Absolute magnitude (MV) | 1.88±0.16 |
| Orbit | |
| Companion | 2 Andromedae B |
| Period (P) | 73.997 ± 0.509 yr |
| Semi-major axis (a) | 0.225 ± 0.011″ |
| Eccentricity (e) | 0.800 ± 0.056 |
| Inclination (i) | 21.7 ± 46.0° |
| Longitude of the node (Ω) | 159.5 ± 2.0° |
| Periastron epoch (T) | 1870.280 ± 0.595 |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Database references | |
| SIMBAD | data |
2 Andromedae (abbreviated 2 And) is a binary star in the constellation Andromeda. 2 Andromedae is the Flamsteed designation. Its apparent magnitude is 5.09.
The binary nature of the star was discovered by Sherburne Wesley Burnham at Lick Observatory in 1889.
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