HD 202259

Last updated
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]
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
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]

Variable star star whose brightness as seen from Earth fluctuates

A variable star is a star whose brightness as seen from Earth fluctuates.

Constellation one of the 88 divisions of the celestial sphere, defined by the IAU, many of which derive from traditional asterisms

A constellation is a group of stars that forms an imaginary outline or pattern on the celestial sphere, typically representing an animal, mythological person or creature, a god, or an inanimate object.

Aquarius (constellation) zodiac constellation straddling the celestial equator

Aquarius is a constellation of the zodiac, situated between Capricornus and Pisces. Its name is Latin for "water-carrier" or "cup-carrier", and its symbol is , a representation of water. Aquarius is one of the oldest of the recognized constellations along the zodiac. It was one of the 48 constellations listed by the 2nd century astronomer Ptolemy, and it remains one of the 88 modern constellations. It is found in a region often called the Sea due to its profusion of constellations with watery associations such as Cetus the whale, Pisces the fish, and Eridanus the river.

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27 Aquilae star

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83 Ursae Majoris is a candidate binary star system in the northern circumpolar constellation of Ursa Major. This is a semiregular variable star, like Mira; for that reason it has been given the variable star designation IQ Ursae Majoris. It ranges in brightness from apparent visual magnitude 4.69 to 4.75. Percy and Au (1994) identified it as a small amplitude red variable with an irregular behavior, having a characteristic time scale of 20 days. Based upon an annual parallax shift of 6.23±0.22 mas, it is located roughly 520 light years from the Sun. The system is moving closer with a heliocentric radial velocity of −18.6 km/s.

HD 23753 is a single star in the equatorial zodiac constellation of Taurus, and is a member of the Pleiades open cluster. It is dimly visible to the naked eye with an apparent visual magnitude of 5.44. The distance to this star, as determined from its annual parallax shift of 7.7 mas, is about 420 light years. It is moving further from the Earth with a heliocentric radial velocity of +8 km/s. The star is positioned near the ecliptic and so is subject to lunar occultations.

References

  1. 1 2 3 4 5 6 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv: 0708.1752  Lock-green.svg, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357
  2. 1 2 3 4 Cousins, A. W. J. (1984), "Standardization of Broadband Photometry of Equatorial Standards", South African Astronomical Observatory Circulars, 8: 59, Bibcode:1984SAAOC...8...59C
  3. 1 2 3 4 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  Lock-green.svg, Bibcode:2004ApJS..152..251V, 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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