Upsilon Pegasi

υ Pegasi
Location of υ Pegasi (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Pegasus
Right ascension 23h 25m 22.78350s[1]
Declination 23° 24′ 14.7606″[1]
Apparent magnitude (V) 4.40[2]
Characteristics
Spectral type F8III[3][4]
U−B color index +0.14[2]
B−V color index +0.61[2]
Astrometry
Radial velocity (Rv)-8.59[5] km/s
Proper motion (μ) RA: +192.19[1] mas/yr
Dec.: +36.12[1] mas/yr
Parallax (π)19.14 ± 0.18[1] mas
Distance170 ± 2 ly
(52.2 ± 0.5 pc)
Absolute magnitude (MV)0.83[6]
Details
Mass2.17[7] M☉
Radius6.0[7] R☉
Luminosity42.35[6] L☉
Surface gravity (log g)3.22[7] cgs
Temperature5,888[7] K
Metallicity [Fe/H]-0.01[6] dex
Rotational velocity (v sin i)33.7[8] km/s
Other designations
Alkarab, BD+22°4833, 68 Pegasi, FK5 881, GC 32585, HIP 115623, HR 8905, HD 220657, SAO 91253
Database references
SIMBADdata

Upsilon Pegasi (υ Pegasi, abbreviated Ups Peg, υ Peg), also named Alkarab,[9] is a star in the constellation of Pegasus. Its apparent magnitude is 4.40[2] and it is approximately 170.4 light-years distant from the Sun based on parallax.[1]

Nomenclature

υ Pegasi (Latinised to Upsilon Pegasi) is the star's Bayer designation.

The star bore the traditional Arabic name Al Karab ("the Bucket-rope").[10] In 2016, the IAU organized a Working Group on Star Names (WGSN)[11] to catalog and standardize proper names for stars. The WGSN approved the name Alkarab for this star on 5 September 2017 and it is now so included in the List of IAU-approved Star Names.[9]

Properties

Upsilon Pegasi is a spectral class F8III[3][4] yellow-white giant star.

Its iron abundance is -0.01 (97.7% of the Sun). It is moving through the Galaxy at a speed of 50.6 km/s relative to the Sun. Its projected Galactic orbit carries it between 18,600 and 26,300 light-years from the center of the Galaxy. [12]

References

  1. 1 2 3 4 5 6 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. 1 2 3 4 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. 1 2 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 Gray, R. O.; Napier, M. G.; Winkler, L. I. (2001). "The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. I. Precise Spectral Types for 372 Stars". The Astronomical Journal. 121 (4): 2148. Bibcode:2001AJ....121.2148G. doi:10.1086/319956.
  5. ↑ Massarotti, Alessandro; Latham, David W.; Stefanik, Robert P.; Fogel, Jeffrey (2008). "Rotational and Radial Velocities for a Sample of 761 Hipparcos Giants and the Role of Binarity". The Astronomical Journal. 135: 209. Bibcode:2008AJ....135..209M. doi:10.1088/0004-6256/135/1/209.
  6. 1 2 3 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
  7. 1 2 3 4 Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures". Astronomy and Astrophysics. 352: 555. arXiv:astro-ph/9911002. Bibcode:1999A&A...352..555A. Vizier catalog entry
  8. ↑ 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. arXiv:astro-ph/0608248. Bibcode:1999A&AS..139..433D. doi:10.1051/aas:1999401. Vizier catalog entry
  9. 1 2 "Naming Stars". IAU.org. Retrieved 16 December 2017.
  10. ↑ Allen, Richard Hinckley (1963) [1899]. Star Names: Their Lore and Meaning (Reprint ed.). New York, NY: Dover Publications Inc. p. 329. ISBN 0-486-21079-0.
  11. ↑ "IAU Working Group on Star Names (WGSN)". Retrieved 22 May 2016.
  12. ↑ http://www.astrostudio.org/xhip.php?hip=115623
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