HD 202259

HD 202259
Observation data; Epoch J2000 Equinox J2000
Constellation	Aquarius
Right ascension	21h 14m 37.04960s
Declination	+00° 05′ 32.1167″
Apparent magnitude (V)	6.39
Characteristics
Spectral type	M1 III
U−B color index	+1.937
B−V color index	+1.608
Variable type	Suspected
Astrometry
Radial velocity (Rv)	−123.5 km/s
Proper motion (μ)	RA: +35.74 mas/yr ; Dec.: –13.46 mas/yr
Parallax (π)	3.45 ± 0.49 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
SIMBAD	data
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

^ ^a ^b ^c ^d ^e ^f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600
^ ^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
^ ^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, arXiv:astro-ph/0402435, Bibcode:2004ApJS..152..251V, doi:10.1086/386343, S2CID 119434884
^ 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, Bibcode:1998IBVS.4655....1K
^ Eggen, O. J. (1992). "Asymptotic giant branch stars near the sun". The Astronomical Journal. 104: 275. Bibcode:1992AJ....104..275E. doi:10.1086/116239.
^ 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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Observation data Epoch J2000 Equinox J2000
Constellation	Aquarius
Right ascension	21^h 14^m 37.04960^s^[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 (R_v)	−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 mas^[1]
Distance	approx. 900 ly (approx. 290 pc)

Other designations
BD-00° 4186, HD 202259, HIP 104872, HR 8121, NSV 13614, SAO 145229.
Database references
SIMBAD	data
Data sources:
Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.)