72 Pegasi

72 Pegasi


Location of 72 Pegasi (circled)

Observation data
Epoch J2000      Equinox J2000
Constellation Pegasus
Right ascension 23h 33m 57.18791s[1]
Declination 31° 19′ 31.0058″[1]
Apparent magnitude (V) 4.97[2]
Characteristics
Spectral type K4IIIb[3]
U−B color index +1.63[4]
B−V color index +1.39[4]
Astrometry
Radial velocity (Rv)-24.71[5] km/s
Proper motion (μ) RA: +50.81[1] mas/yr
Dec.: -17.46[1] mas/yr
Parallax (π)5.94 ± 0.45[1] mas
Distance550 ± 40 ly
(170 ± 10 pc)
Absolute magnitude (MV)-1.15[2]
Orbit[6]
Period (P)492.30 ± 75.96 a (179,811 ± 27,745 d)
Semi-major axis (a)0.568 ± 0.065″
Eccentricity (e)0.322 ± 0.047
Inclination (i)21.7 ± 8.3°
Longitude of the node (Ω)56.2 ± 6.0°
Periastron epoch (T)MJD 16818 ± 3658
Argument of periastron (ω)
(secondary)		293 ± 15°
Details
Mass2 / 2[6] M☉
Luminosity554[2] L☉
Surface gravity (log g)2.00[7] cgs
Temperature4,379[8] K
Metallicity [Fe/H]+0.06[2] dex
Rotational velocity (v sin i)1.4[9] km/s
Other designations
BD+30° 4978, CCDM J23340+3120AB, GC 32772, HIP 116310, HR 8943, HD 221673, SAO 73341, WDS J23340+3120AB
Database references
SIMBADdata

72 Pegasi (72 Peg) is a binary star in the constellation Pegasus. Its combined apparent magnitude is 4.97[2] and it is approximately 550 light years away, based on the system's parallax.[1]

72 Pegasi is a visual binary with an orbital period of 492 years. The two stars are relatively similar and are about twice the mass of the Sun each. The primary star, 72 Pegasi A, is a K-type giant with a magnitude of 5.67. The companion, 72 Pegasi B, is another K-type giant with an apparent magnitude of 6.11, and a separation of about 0.568″. 72 Pegasi B is thought to be a binary itself, with a brown dwarf in a 4.2-year period.[6]

References

  1. 1 2 3 4 5 6 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. Bibcode:2007A&A...474..653V. arXiv:0708.1752 Freely accessible. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. 1 2 3 4 5 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. Bibcode:2012AstL...38..331A. arXiv:1108.4971 Freely accessible. doi:10.1134/S1063773712050015. Vizier catalog entry
  3. ↑ Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally published in: 1964BS....C......0H. 5050. Bibcode:1995yCat.5050....0H.
  4. 1 2 Mermilliod, J. C. (2006). "VizieR Online Data Catalog: Homogeneous Means in the UBV System (Mermilliod 1991)". VizieR On-line Data Catalog: II/168. Originally published in: Institut d'Astronomie. 2168. Bibcode:2006yCat.2168....0M.Vizier catalog entry
  5. ↑ 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. Bibcode:2005A&A...430..165F. arXiv:astro-ph/0409579 Freely accessible. doi:10.1051/0004-6361:20041272.
  6. 1 2 3 Muterspaugh, Matthew W.; Lane, Benjamin F.; Kulkarni, S. R.; Konacki, Maciej; Burke, Bernard F.; Colavita, M. M.; Shao, M.; Hartkopf, William I.; Boss, Alan P.; Williamson, M. (2010). "The Phases Differential Astrometry Data Archive. V. Candidate Substellar Companions to Binary Systems". The Astronomical Journal. 140 (6): 1657. Bibcode:2010AJ....140.1657M. arXiv:1010.4048 Freely accessible. doi:10.1088/0004-6256/140/6/1657.
  7. ↑ Soubiran, Caroline; Le Campion, Jean-François; Brouillet, Nathalie; Chemin, Laurent (2016). "The PASTEL catalogue: 2016 version". Astronomy & Astrophysics. 591: A118. Bibcode:2016A&A...591A.118S. arXiv:1605.07384 Freely accessible. doi:10.1051/0004-6361/201628497.
  8. ↑ 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. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x. Vizier catalog entry
  9. ↑ 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. Bibcode:1999A&AS..139..433D. doi:10.1051/aas:1999401. Vizier catalog entry


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