55 Pegasi

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55 Pegasi
Pegasus constellation map.svg
Red circle.svg

Location of 55 Pegasi (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Pegasus
Right ascension 23h 07m 00.25965s[1]
Declination 9° 24′ 34.1703″[1]
Apparent magnitude (V) 4.51[2]
Spectral type M1IIIab[3]
U−B color index +1.88[2]
B−V color index +1.58[2]
Radial velocity (Rv) -5.34[4] km/s
Proper motion (μ) RA: +6.41[1] mas/yr
Dec.: -12.71[1] mas/yr
Parallax (π) 9.92 ± 0.29[1] mas
Distance 329 ± 10 ly
(101 ± 3 pc)
Absolute magnitude (MV) -0.48[5]
Luminosity 443[5] L
Temperature 3,929[6] K
Other designations
BD+08°4997, FK5 1603, GC 32196, HIP 114144, HR 8795, HD 218329, NSV 14428, SAO 127976
Database references

55 Pegasi (55 Peg) is a class M1III[3] (red giant) star in the constellation Pegasus. Its apparent magnitude is 4.51[2] and it is approximately 329 light years away based on parallax.[1]

It is a suspected variable, with an observed magnitude range from 4.50 to 4.56.[7]


  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. ^ a b 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. ^ 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. 
  5. ^ 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
  6. ^ 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:1208.2037Freely accessible. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x.  Vizier catalog entry
  7. ^ Watson, C. L. (2006). "The International Variable Star Index (VSX)". The Society for Astronomical Sciences 25th Annual Symposium on Telescope Science. Held May 23–25. 25: 47. Bibcode:2006SASS...25...47W.