Alpha Vulpeculae
Star in the constellation Vulpecula / From Wikipedia, the free encyclopedia
Alpha Vulpeculae (α Vulpeculae, abbreviated Alpha Vul, α Vul), officially named Anser /ˈænsər/,[10] is the brightest star in the constellation of Vulpecula. It is approximately 291 light-years from Earth. It forms a wide optical binary with 8 Vulpeculae.[11]
Quick Facts Observation data Epoch J2000.0 Equinox J2000.0, Constellation ...
Observation data Epoch J2000.0 Equinox J2000.0 | |
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Constellation | Vulpecula |
Right ascension | 19h 28m 42.3299s[1] |
Declination | +24° 39′ 53.661″[1] |
Apparent magnitude (V) | 4.40[2] |
Characteristics | |
Evolutionary stage | red giant[3] |
Spectral type | M1 III[4] |
U−B color index | +1.81[2] |
B−V color index | 1.487[5] |
Variable type | suspected[3] |
Astrometry | |
Radial velocity (Rv) | −84.91±0.26[5] km/s |
Proper motion (μ) | RA: −126.197±0.071[1] mas/yr Dec.: −106.865±0.111[1] mas/yr |
Parallax (π) | 11.2238 ± 0.1129 mas[1] |
Distance | 291 ± 3 ly (89.1 ± 0.9 pc) |
Absolute magnitude (MV) | −0.36[6] |
Details[7] | |
Mass | 0.97 M☉ |
Radius | 43.14 R☉ |
Luminosity | 415.9 L☉ |
Surface gravity (log g) | 1.30 cgs |
Temperature | 3,690 K |
Metallicity [Fe/H] | -0.38[8] dex |
Rotational velocity (v sin i) | 4.6[5] km/s |
Age | 11.30 Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Close
Alpha Vulpeculae is a red giant of spectral class M1 and has an apparent magnitude of +4.4. It has been analyzed as a member of the Arcturus stream, a group of stars with high proper motion and metal-poor properties thought to be the remnants of a small galaxy consumed by the Milky Way.[12]