23 Vulpeculae

23 Vulpeculae is a triple star[12] system in the northern constellation of Vulpecula. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.52[2] and it is located approximately 340 light years away from the Sun based on parallax.[1] The system is moving further from the Earth with a heliocentric radial velocity of +1.47 km/s.[4]

23 Vulpeculae
Location of 23 Vulpeculae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Vulpecula
Right ascension  20h 15m 46.13481s[1]
Declination 27° 48′ 51.2787″[1]
Apparent magnitude (V) 4.52[2]
Characteristics
Spectral type K3- III Fe-1[3]
U−B color index +1.11[2]
B−V color index +1.26[2]
Astrometry
Radial velocity (Rv)+1.47[4] km/s
Proper motion (μ) RA: −34.27[1] mas/yr
Dec.: +6.41[1] mas/yr
Parallax (π)9.63 ± 0.46[1] mas
Distance340 ± 20 ly
(104 ± 5 pc)
Absolute magnitude (MV)-0.58[5]
Orbit[6]
Primary23 Vul Aa
Companion23 Vul Ab
Period (P)25.33 yr
Semi-major axis (a)0.111″
Eccentricity (e)0.400
Inclination (i)71.5°
Longitude of the node (Ω)97.5°
Periastron epoch (T)2009.56
Argument of periastron (ω)
(secondary)		293.8°
Details
23 Vul A
Mass2.4[7] M☉
Luminosity146[5] L☉
Surface gravity (log g)0.89[8] cgs
Temperature4,429[9] K
Metallicity [Fe/H]+0.03[5] dex
Rotational velocity (v sin i)3.7[10] km/s
Other designations
23 Vul, BD+27°3666, GC 28152, HD 192806, HIP 99874, HR 7744, SAO 88428, WDS J20158+2749AB[11]
Database references
SIMBADdata

Component A forms a binary system with an orbital period of 25.33 years, an eccentricity of 0.40, and a semimajor axis of 0.11″.[6] The 4.80 magnitude member of this pair, component Aa is an aging giant star with a stellar classification of K3- III Fe-1,[3] where the suffix indicates an underabundance of iron in the spectrum. This star has 2.4[7] times the mass of the Sun and is radiating 146[5] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,429 K.[9] Its companion, component Ab, has magnitude 6.5.[6] The tertiary member, component B, has a separation of 0.26" and a magnitude of 6.94.[7][13][12]

References
  1. Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  3. Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins Catalog of Revised MK Types for the Cooler Stars". The Astrophysical Journal Supplement Series. 71: 245. Bibcode:1989ApJS...71..245K. doi:10.1086/191373.
  4. Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. (2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data". Astronomy & Astrophysics. 430: 165. arXiv:astro-ph/0409579. Bibcode:2005A&A...430..165F. doi:10.1051/0004-6361:20041272.
  5. 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. Vizier catalog entry
  6. "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Archived from the original on 2017-04-30. Retrieved 2017-06-02 – via Naval Oceanography Portal. Contains data from Hartkopf, W. I.; Mason, B. D.; Worley, C. E. (2001). Fifth Catalog of Orbits of Visual Binary Stars.
  7. Malkov, O. Yu.; Tamazian, V. S.; Docobo, J. A.; Chulkov, D. A. (2012). "Dynamical masses of a selected sample of orbital binaries". Astronomy & Astrophysics. 546: A69. Bibcode:2012A&A...546A..69M. doi:10.1051/0004-6361/201219774. Vizier catalog entry
  8. Soubiran, Caroline; Le Campion, Jean-François; Brouillet, Nathalie; Chemin, Laurent (2016). "The PASTEL catalogue: 2016 version". Astronomy & Astrophysics. 591: A118. arXiv:1605.07384. Bibcode:2016A&A...591A.118S. doi:10.1051/0004-6361/201628497.
  9. McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012). "Fundamental parameters and infrared excesses of Hipparcos stars". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–357. arXiv:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x. Vizier catalog entry
  10. De Medeiros, J. R.; Mayor, M. (1999). "A catalog of rotational and radial velocities for evolved stars". Astronomy and Astrophysics Supplement Series. 139 (3): 433. arXiv:astro-ph/0608248. Bibcode:1999A&AS..139..433D. doi:10.1051/aas:1999401. Vizier catalog entry
  11. "23 Vul". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-05-26.
  12. Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. Vizier catalog entry
  13. Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ....122.3466M. doi:10.1086/323920. Vizier catalog entry
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