33 Vulpeculae

33 Vulpeculae is a single[6] star located around 500 light years away from the Sun in the northern constellation of Vulpecula. It is visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of 5.31.[2] The object is drifting closer to the Earth with a heliocentric radial velocity of −25 km/s.[3]

33 Vulpeculae
Observation data
Epoch J2000      Equinox J2000
Constellation Vulpecula
Right ascension  20h 58m 16.34942s[1]
Declination +22° 19′ 33.2638″[1]
Apparent magnitude (V) 5.31[2]
Characteristics
Spectral type K3.5 III[2]
B−V color index 1.419±0.005[3]
Astrometry
Radial velocity (Rv)−25.23±0.24[3] km/s
Proper motion (μ) RA: −2.327[1] mas/yr
Dec.: −4.511[1] mas/yr
Parallax (π)6.5257 ± 0.1689[1] mas
Distance500 ± 10 ly
(153 ± 4 pc)
Absolute magnitude (MV)−0.41[3]
Details
Radius35.34+1.13
−2.22[1] R☉
Luminosity333.7±9.9[1] L☉
Surface gravity (log g)1.91[4] cgs
Temperature4,070[4] K
Metallicity [Fe/H]−0.12[4] dex
Other designations
33 Vul, BD+21° 4424, FK5 1549, HD 199697, HIP 103511, HR 8032, SAO 89332[5]
Database references
SIMBADdata

This is an evolved giant star with a stellar classification of K3.5 III,[2] having exhausted the supply of hydrogen at it its core and expanded to 35[1] times the Sun's radius. It serves as a spectral standard for stars of its particular class.[7] This star is radiating 334[1] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,070 K.[4]

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
  3. Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015.
  4. Soubiran, C.; et al. (June 2010), "The PASTEL catalogue of stellar parameters", Astronomy and Astrophysics, 515: A111, arXiv:1004.1069, Bibcode:2010A&A...515A.111S, doi:10.1051/0004-6361/201014247.
  5. "33 Vul". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-04-21.
  6. Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
  7. Keenan, P. C.; Yorka, S. B. (1988), "1988 Revised MK Spectral Standards for Stars GO and Later", Bulletin d'Information du Centre de Données Stellaires, 35: 37, Bibcode:1988BICDS..35...37K.
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