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Alpha Vulpeculae

α Vulpeculae
Location of α Vulpeculae (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
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]
Distance291 ± 3 ly
(89.1 ± 0.9 pc)
Absolute magnitude (MV)−0.36[6]
Details[7]
Mass0.97 M☉
Radius43.14 R☉
Luminosity415.9 L☉
Surface gravity (log g)1.30 cgs
Temperature3,690 K
Metallicity [Fe/H]-0.38[8] dex
Rotational velocity (v sin i)4.6[5] km/s
Age11.30 Gyr
Other designations
Anser, α Vul, 6 Vulpeculae, BD+24°3759, FK5 1508, HD 183439, HIP 95771, HR 7405, SAO 87261, CCDM J19288+2442A, WDS J19287+2440A[9]
Database references
SIMBADdata

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]

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]

  1. ^ a b c d e Cite error: The named reference Gaia EDR3 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference mermilliod was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference lebzelter2018 was invoked but never defined (see the help page).
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  5. ^ a b c Cite error: The named reference aj135_1_209 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference baines2018 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference huang2016 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference IAU-LSN was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference WDS was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference eggen71a was invoked but never defined (see the help page).

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