HD 202259

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HD 202259
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 21h 14m 37.04960s[1]
Declination +00° 05′ 32.1167″[1]
Apparent magnitude (V) 6.39[2]
Spectral type M1 III[3]
U−B color index +1.937[2]
B−V color index +1.608[2]
Variable type Suspected[4]
Radial velocity (Rv) −123.5[3] km/s
Proper motion (μ) RA: +35.74[1] mas/yr
Dec.: –13.46[1] mas/yr
Parallax (π) 3.45 ± 0.49[1] mas
Distance approx. 900 ly
(approx. 290 pc)
Other designations
BD-00° 4186, HD 202259, HIP 104872, HR 8121, NSV 13614, SAO 145229.
Database references
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)

HD 202259 is a suspected variable star in the equatorial constellation of Aquarius. With an apparent magnitude of 6.39,[2] according to the Bortle scale it is faintly visible to the naked eye from dark rural skies. It has a stellar classification of M1 III,[3] and is a red giant located along the asymptotic giant branch of the HR diagram.[5] Located about 900 light years away,[1] its radial velocity of −123.5 km/s[3] indicates this is a high-velocity star.[6]


  1. ^ a b c d e f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752Freely accessible, doi:10.1051/0004-6361:20078357 
  2. ^ a b c d Cousins, A. W. J. (1984), "Standardization of Broadband Photometry of Equatorial Standards", South African Astronomical Observatory Circulars, 8: 59, Bibcode:1984SAAOC...8...59C 
  3. ^ a b c d Valdes, Francisco; et al. (June 2004), "The Indo-US Library of Coudé Feed Stellar Spectra", The Astrophysical Journal Supplement Series, 152 (2): 251–259, Bibcode:2004ApJS..152..251V, arXiv:astro-ph/0402435Freely accessible, doi:10.1086/386343 
  4. ^ Kazarovets, E. V.; et al. (December 1998), "New Catalogue of Suspected Variable Stars. Supplement - Version 1.0", Information Bulletin on Variable Stars, 4655 (1), Bibcode:1998IBVS.4655....1K 
  5. ^ Eggen, O. J. (1992). "Asymptotic giant branch stars near the sun". The Astronomical Journal. 104: 275. Bibcode:1992AJ....104..275E. doi:10.1086/116239. 
  6. ^ Keenan, P.; McNeil, R. (October 1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245–266, Bibcode:1989ApJS...71..245K, doi:10.1086/191373 

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