Astronomy:HD 202259

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Short description: Star in the constellation Aquarius
HD 202259
Observation data
Equinox J2000.0]] (ICRS)
Constellation Aquarius
Right ascension  21h 14m 37.04960s[1]
Declination +00° 05′ 32.1167″[1]
Apparent magnitude (V) 6.39[2]
Characteristics
Spectral type M1 III[3]
U−B color index +1.937[2]
B−V color index +1.608[2]
Variable type Suspected[4]
Astrometry
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
Distanceapprox. 900 ly
(approx. 290 pc)
Other designations
BD-00° 4186, HD 202259, HIP 104872, HR 8121, NSV 13614, SAO 145229.
Database references
SIMBADdata
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]

References

  1. 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode2007A&A...474..653V 
  2. 2.0 2.1 2.2 2.3 Cousins, A. W. J. (1984), "Standardization of Broadband Photometry of Equatorial Standards", South African Astronomical Observatory Circulars 8: 59, Bibcode1984SAAOC...8...59C 
  3. 3.0 3.1 3.2 3.3 Valdes, Francisco et al. (June 2004), "The Indo-US Library of Coudé Feed Stellar Spectra", The Astrophysical Journal Supplement Series 152 (2): 251–259, doi:10.1086/386343, Bibcode2004ApJS..152..251V 
  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): 1, Bibcode1998IBVS.4655....1K 
  5. Eggen, O. J. (1992). "Asymptotic giant branch stars near the sun". The Astronomical Journal 104: 275. doi:10.1086/116239. Bibcode1992AJ....104..275E. 
  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, doi:10.1086/191373, Bibcode1989ApJS...71..245K 

External links