HD 180450

Last updated
HD 180450
Observation data
Epoch J2000.0       Equinox J2000.0
Constellation Lyra
Right ascension 19h 15m 24.85937s [1]
Declination +30° 31 34.9760 [1]
Apparent magnitude  (V)5.88 [2]
Characteristics
Spectral type M1IIIab [2]
U−B color index +2.03
B−V color index +1.665±0.007 [2]
Astrometry
Radial velocity (Rv)−64.43±0.23 [1]  km/s
Proper motion (μ)RA: 34.425 [1]   mas/yr
Dec.: −26.081 [1]   mas/yr
Parallax (π)2.37 ± 0.61  mas [1]
Distance approx. 1,400  ly
(approx. 400  pc)
Absolute magnitude  (MV)−2.03 [2]
Details
Radius 68+12
−13
[1]   R
Luminosity 1,002±34 [1]   L
Temperature 3,947+433
−305
[1]   K
Other designations
BD+30°3491, GC  26550, HD  180450, HIP  94630, HR  7302, SAO  68040, GSC  02653-01682 [3]
Database references
SIMBAD data

HD 180450 is a single [4] star in the northern constellation of Lyra, positioned about half a degree to the NNW of the globular cluster M56. [5] At an apparent visual magnitude of 5.88, [2] it is dimly visible to the naked eye under good viewing conditions. This star is located at a distance of approximately 1,400  light years from the Sun based on parallax measurements, but is drifting closer with a radial velocity of −64.4 km/s. [1]

This is an aging red giant star with a stellar classification of M1IIIab, [2] It is currently on the asymptotic giant branch, [6] having exhausted the supply of hydrogen in its core and evolved of the main sequence. It has expanded to ~68 times the radius of the Sun and is radiating a thousand times the Sun' luminosity from its enlarged photosphere at en effective temperature of 3,947 K. [1]

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References

  1. 1 2 3 4 5 6 7 8 9 10 11 Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics . 616. A1. arXiv: 1804.09365 . Bibcode: 2018A&A...616A...1G . doi: 10.1051/0004-6361/201833051 . Gaia DR2 record for this source at VizieR.
  2. 1 2 3 4 5 6 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, S2CID   119257644.
  3. "HD 180450". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2021-10-14.
  4. Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv: 0806.2878 , Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID   14878976.
  5. Sinnott, Roger W.; Perryman, Michael A. C. (1997), Millennium Star Atlas, vol. 3, Sky Publishing Corporation and the European Space Agency, p. 1174, ISBN   0-933346-84-0.
  6. Eggen, Olin J. (July 1992), "Asymptotic giant branch stars near the sun", Astronomical Journal, 104 (1): 275–313, Bibcode:1992AJ....104..275E, doi:10.1086/116239.