13 Vulpeculae

13 Vulpeculae is a blue giant with a stellar classification of class B9.5III[2] in the northern constellation Vulpecula. It is visible to the naked eye as a faint, blue-white hued star with an apparent visual magnitude of 4.57[2] and it is approximately 335 light years away from the Sun based on parallax.[1] The star is radiating 180[2] times the luminosity of the Sun from its photosphere at an effective temperature of 8,801 K.[7]

13 Vulpeculae
Location of 13 Vulpeculae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Vulpecula
Right ascension  19h 53m 27.69557s[1]
Declination 24° 04′ 46.6099″[1]
Apparent magnitude (V) 4.57[2]
Characteristics
Spectral type B9.5III[2]
U−B color index −0.13[3]
B−V color index −0.06[3]
Astrometry
Radial velocity (Rv)−28.10[4] km/s
Proper motion (μ) RA: +23.06[1] mas/yr
Dec.: +36.28[1] mas/yr
Parallax (π)9.75 ± 0.54[1] mas
Distance330 ± 20 ly
(103 ± 6 pc)
Absolute magnitude (MV)−0.48[2]
Orbit[5]
Period (P)615.25±104.12 yr
Semi-major axis (a)1.555±0.241″
Eccentricity (e)0.079±0.042
Inclination (i)85.9±1.5°
Longitude of the node (Ω)68.1±0.3°
Periastron epoch (T)2027.82±94.79
Argument of periastron (ω)
(secondary)		169.7±4.4°
Details
13 Vul A
Radius1.3[6] R☉
Luminosity180[2] L☉
Temperature8,801[7] K
Metallicity [Fe/H]−0.11[2] dex
Rotational velocity (v sin i)45.0[8] km/s
Other designations
13 Vul, BD+23°3820, GC 27544, HD 188260, HIP 97886, HR 7592, SAO 87883, CCDM J19535+2405AB, WDS J19535+2405AB, 2MASS J19532768+2404464[9]
Database references
SIMBADdata

There is one reported companion, designated component B, with a magnitude of 7.37, an orbital period of roughly 615 years, and an angular separation of 1.55″.[10] The system is moving closer to the Earth with a heliocentric radial velocity of −28 km/s.[4]

References
  1. Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. 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
  3. Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers. 42: 443. Bibcode:2014JAVSO..42..443M.Vizier catalog entry
  4. Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
  5. Hartkopf, W. I.; et al. (June 30, 2006), Sixth Catalog of Orbits of Visual Binary Stars, United States Naval Observatory, retrieved 2017-06-02.
  6. Pasinetti Fracassini, L. E.; et al. (February 2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)". Astronomy and Astrophysics (Third ed.). 367 (2): 521–524. arXiv:astro-ph/0012289. Bibcode:2001A&A...367..521P. doi:10.1051/0004-6361:20000451.
  7. 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: 343. arXiv:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x. Vizier catalog entry
  8. Glebocki, R.; Gnacinski, P. (2005). "VizieR Online Data Catalog: Catalog of Stellar Rotational Velocities (Glebocki+ 2005)". VizieR On-line Data Catalog: III/244. Originally Published in: 2005csss...13..571G; 2005yCat.3244....0G. 3244. Bibcode:2005yCat.3244....0G. Vizier catalog entry
  9. "13 Vul". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-03-15.
  10. 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
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