Nu Andromedae
Nu Andromedae (Nu And, ν Andromedae, ν And) is a binary star in the constellation Andromeda. The system has an apparent visual magnitude of 4.5, which is bright enough to be seen with the naked eye. It is approximately 620 light-years (190 parsecs) from Earth. Situated just over a degree to the west of this star is the Andromeda Galaxy.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda |
| Right ascension | 00h 49m 48.84737s |
| Declination | +41° 04′ 44.0764″ |
| 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: +22.77 ±0.12 mas/yr Dec.: –18.35 ±0.09 mas/yr |
| Parallax (π) | 5.28 ± 0.15 mas |
| Distance | 620 ± 20 ly (189 ± 5 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) | 18155.67 |
| 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 | |
| Database references | |
| SIMBAD | data |
Nu Andromedae is spectroscopic binary system with a nearly circular orbit that has a period of 4.2828 days. 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.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.