Alpha Vulpeculae
Alpha Vulpeculae (α Vulpeculae, abbreviated Alpha Vul, α Vul), officially named Anser /ˈænsər/, 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.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Vulpecula |
| Right ascension | 19h 28m 42.3299s |
| Declination | +24° 39′ 53.661″ |
| Apparent magnitude (V) | 4.40 |
| Characteristics | |
| Evolutionary stage | red giant |
| Spectral type | M1 III |
| U−B color index | +1.81 |
| B−V color index | 1.487 |
| Variable type | suspected |
| Astrometry | |
| Radial velocity (Rv) | −84.91±0.26 km/s |
| Proper motion (μ) | RA: −126.197±0.071 mas/yr Dec.: −106.865±0.111 mas/yr |
| Parallax (π) | 11.2238 ± 0.1129 mas |
| Distance | 291 ± 3 ly (89.1 ± 0.9 pc) |
| Absolute magnitude (MV) | −0.36 |
| Details | |
| 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 dex |
| Rotational velocity (v sin i) | 4.6 km/s |
| Age | 11.30 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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.
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