2 Pegasi

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2 Pegasi
Pegasus constellation map.svg
Red circle.svg

Location of 2 Pegasi (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Pegasus
Right ascension 21h 29m 56.89545s[1]
Declination 23° 38′ 19.8170″[1]
Apparent magnitude (V) 4.52[2]
Spectral type M1+III[3]
U−B color index +1.93[4]
B−V color index +1.62[4]
Radial velocity (Rv) -18.92[5] km/s
Proper motion (μ) RA: +24.74[1] mas/yr
Dec.: +3.63[1] mas/yr
Parallax (π) 8.28 ± 0.18[1] mas
Distance 394 ± 9 ly
(121 ± 3 pc)
Absolute magnitude (MV) -0.89[2]
Luminosity 581[6] L
Temperature 3,949[6] K
Other designations
BD+23°4325, CCDM J21299+2338A, FK5 1565, GC 30109, HIP 106140, HR 8225, HD 204724, NSV 25624, SAO 89752, WDS J21299+2338A
Database references

2 Pegasi is a class M1III[3] (red giant) star in the constellation Pegasus. Its apparent magnitude is 4.52[2] and it is approximately 394 light years away based on parallax.[1]

It is a binary star with one companion, B, at a separation of 30.4" and magnitude 12.7.[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 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
  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. ^ a b 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
  5. ^ Famaey, B.; Pourbaix, D.; Frankowski, A.; Van Eck, S.; Mayor, M.; Udry, S.; Jorissen, A. (2009). "Spectroscopic binaries among Hipparcos M giants". Astronomy and Astrophysics. 498 (2): 627. arXiv:0901.0934Freely accessible. Bibcode:2009A&A...498..627F. doi:10.1051/0004-6361/200810698. 
  6. ^ a b 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. ^ 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