Nu Andromedae
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda |
| Right ascension | 00h 49m 48.846s |
| Declination | +41° 04′ 44.08″ |
| Apparent magnitude (V) | 4.522 |
| Characteristics | |
| Spectral type | B4/5 V + F8 V |
| U−B color index | –0.573 |
| B−V color index | –0.136 |
| Astrometry | |
| Radial velocity (Rv) | –23.9 km/s |
| Proper motion (μ) | RA: +21.711 mas/yr Dec.: –18.694 mas/yr |
| Parallax (π) | 5.7868±0.1857 mas |
| Distance | 560 ± 20 ly (173 ± 6 pc) |
| Absolute magnitude (MV) | −1.85 |
| Orbit | |
| Period (P) | 4.2827 d |
| Eccentricity (e) | 0.03 |
| Longitude of the node (Ω) | 25.° |
| Periastron epoch (T) | 18,155.67 |
| Semi-amplitude (K1) (primary) | 71.7 km/s |
| Semi-amplitude (K2) (secondary) | 101.9 km/s |
| Details | |
| ν And A | |
| Mass | 5.9±0.2 M☉ |
| Radius | 3.4 R☉ |
| Luminosity | 1,104 L☉ |
| Surface gravity (log g) | 4.12±0.43 cgs |
| Temperature | 14,851±396 K |
| Metallicity [Fe/H] | +0.14±0.17 dex |
| Rotational velocity (v sin i) | 20 km/s |
| Age | 63.1±17.9 Myr |
| Other designations | |
| ν Andromedae, ν And, Nu And, 35 Andromedae, 35 And, BD+40 171, FK5 1021, HD 4727, HIP 3881, HR 226, SAO 36699, PPM 43365 | |
| Database references | |
| SIMBAD | data |
Nu Andromedae is a binary star system in the constellation Andromeda. Its Bayer designation is Latinized from ν Andromedae, and abbreviated Nu And or ν And, respectively. The system has an apparent visual magnitude of 4.5, which is bright enough to be seen with the naked eye. Based on parallax measurements, it is located at a distance of approximately 560 light-years (170 parsecs) from Earth. The pair are drifting closer with a heliocentric radial velocity of –24 km/s. Situated just over a degree to the west of this star is the Andromeda Galaxy.
Nu Andromedae is close spectroscopic binary system with a period of 4.2828 days and a nearly circular orbit. The primary component is a B-type main sequence star with a stellar classification of B5 V. The fainter secondary has a classification of F8 V, which makes it an F-type main sequence star. The pair is about 63 million years old.
The pair have a peculiar velocity of 22.16±0.87 km/s relative to neighboring stars, which doesn't qualify it to be a runaway star system but does suggest it escaped its star cluster of origin. The trajectory indicates it may have left the NGC 6405 cluster some 25 million years ago.