Nu Andromedae
Binary star in the constellation Andromeda / From Wikipedia, the free encyclopedia
Not to be confused with Andromeda V or 5 Andromedae.
"ν And" redirects here. For other uses, see Vand.
Nu Andromedae (Atropabella by Alicia, Nu And, ν Andromedae, ν And) is a binary star in the constellation Andromeda. The system has an apparent visual magnitude of 4.5,[2] which is bright enough to be seen with the naked eye. It is approximately 620 light-years (190 parsecs) from Earth.[1] Situated just over a degree to the west of this star is the Andromeda Galaxy.[12]
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Andromeda |
Right ascension | 00h 49m 48.84737s[1] |
Declination | +41° 04′ 44.0764″[1] |
Apparent magnitude (V) | 4.522[2] |
Characteristics | |
Spectral type | B4/5 V[3][4] + F8 V[5] |
U−B color index | –0.573[2] |
B−V color index | –0.136[2] |
Astrometry | |
Radial velocity (Rv) | –23.9[6] km/s |
Proper motion (μ) | RA: +22.77 ±0.12[1] mas/yr Dec.: –18.35 ±0.09[1] mas/yr |
Parallax (π) | 5.28 ± 0.15 mas[1] |
Distance | 620 ± 20 ly (189 ± 5 pc) |
Absolute magnitude (MV) | −1.85[7] |
Orbit[5] | |
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[3] M☉ |
Radius | 3.4[8] R☉ |
Luminosity | 1,104[7] L☉ |
Surface gravity (log g) | 4.12 ± 0.43[9] cgs |
Temperature | 14,851 ± 396[9] K |
Metallicity [Fe/H] | +0.14 ± 0.17[9] dex |
Rotational velocity (v sin i) | 20[10] km/s |
Age | 63.1 ± 17.9[3] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Close
Nu Andromedae is spectroscopic binary[3] system with a nearly circular orbit that has a period of 4.2828 days.[5] The primary component is a B-type main sequence star with a stellar classification of B5 V.[3] The fainter secondary has a classification of F8 V,[5] which makes it an F-type main sequence star. The pair is about 63 million years old.[3]