56 Pegasi

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56 Pegasi
Pegasus constellation map.svg
Red circle.svg

Location of 56 Pegasi (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Pegasus
Right ascension 23h 07m 06.73908s[1]
Declination 25° 28′ 05.7329″[1]
Apparent magnitude (V) 4.74[2]
Spectral type K0IIp + sdO[3][4]
U−B color index +1.14[2]
B−V color index +1.32[2]
Radial velocity (Rv) -27.55[5] km/s
Proper motion (μ) RA: -0.03[1] mas/yr
Dec.: -33.07[1] mas/yr
Parallax (π) 5.51 ± 0.23[1] mas
Distance 590 ± 20 ly
(181 ± 8 pc)
Absolute magnitude (MV) −1.32[6]
Mass 5.4[7] M
Luminosity 680[8] L
Surface gravity (log g) 0.50[9] cgs
Temperature 4,416[10] K
Metallicity [Fe/H] -0.21[8] dex
Rotational velocity (v sin i) 4.4[11] km/s
Other designations
BD+24°4716, FK5 3848, GC 32201, HIP 114155, HR 8796, HD 218356, NSV 14429, SAO 91019
Database references

56 Pegasi (56 Peg) is a spectroscopic binary star in the constellation Pegasus. Its apparent magnitude is 4.74[2] and it is approximately 590 light years away based on parallax.[1]

The companion, a subdwarf O star, has a period of about 111 days.[4]


  1. ^ a b c d e f Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.  Vizier catalog entry
  2. ^ a b c d 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. ^ Simon, T.; Linsky, J. L.; Stencel, R. E. (1982). "On the reality of a boundary in the H-R diagram between late-type stars with and without high temperature outer atmospheres". Astrophysical Journal. 257: 225. Bibcode:1982ApJ...257..225S. doi:10.1086/159981. 
  4. ^ a b Griffin, R. F. (2006). "Spectroscopic binary orbits from photoelectric radial velocities - Paper 186: 56 Pegasi". The Observatory. 126: 1. Bibcode:2006Obs...126....1G. 
  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. arXiv:astro-ph/0409579Freely accessible. Bibcode:2005A&A...430..165F. doi:10.1051/0004-6361:20041272. 
  6. ^ Frankowski, A.; Jorissen, A. (2006). "The puzzling case of 56 Pegasi: A fast rotator seen nearly pole-on". The Observatory. 126: 25. Bibcode:2006Obs...126...25F. 
  7. ^ Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society. 410: 190. arXiv:1007.4883Freely accessible. Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x.  Vizier catalog entry
  8. ^ a b Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971Freely accessible. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015.  Vizier catalog entry
  9. ^ Soubiran, Caroline; Le Campion, Jean-François; Brouillet, Nathalie; Chemin, Laurent (2016). "The PASTEL catalogue: 2016 version". Astronomy & Astrophysics. 591: A118. arXiv:1605.07384Freely accessible. Bibcode:2016A&A...591A.118S. doi:10.1051/0004-6361/201628497. 
  10. ^ Martínez, M. Isabel Pérez; Schröder, K.-P.; Cuntz, M. (2011). "The basal chromospheric Mg ii h+k flux of evolved stars: Probing the energy dissipation of giant chromospheres". Monthly Notices of the Royal Astronomical Society. 414: 418. arXiv:1102.4832Freely accessible. Bibcode:2011MNRAS.414..418P. doi:10.1111/j.1365-2966.2011.18421.x.  Vizier catalog entry
  11. ^ 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