HD 180450
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Lyra[1] |
| Right ascension | 19h 15m 24.85937s[2] |
| Declination | +30° 31′ 34.9760″[2] |
| Apparent magnitude (V) | 5.88[1] |
| Characteristics | |
| Evolutionary stage | AGB[3] |
| Spectral type | M1IIIab[1] |
| U−B color index | +2.03 |
| B−V color index | +1.665±0.007[1] |
| Astrometry | |
| Radial velocity (Rv) | −64.43±0.23[2] km/s |
| Proper motion (μ) | RA: 34.425[2] mas/yr Dec.: −26.081[2] mas/yr |
| Parallax (π) | 2.37±0.61 mas[2] |
| Distance | approx. 1,400 ly (approx. 400 pc) |
| Absolute magnitude (MV) | −2.03[1] |
| Details | |
| Mass | 1.4[4] M☉ |
| Radius | 84[5] R☉ |
| Luminosity | 1,218[5] L☉ |
| Surface gravity (log g) | 1.58[4] cgs |
| Temperature | 3,733[5] K |
| Metallicity [Fe/H] | −0.23[4] dex |
| Other designations | |
| BD+30°3491, GC 26550, HD 180450, HIP 94630, HR 7302, SAO 68040, GSC 02653-01682[6] | |
| Database references | |
| SIMBAD | data |
HD 180450 is a single[7] star in the northern constellation of Lyra, positioned about half a degree to the NNW of the globular cluster M56.[8] At an apparent visual magnitude of 5.88,[1] 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.[2]
This is an aging red giant star with a stellar classification of M1IIIab,[1] It is currently on the asymptotic giant branch,[9] 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.[2]
References
[edit]- ^ a b c d e f g 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. XHIP record for this object at VizieR.
- ^ a b c d e f g h 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.
- ^ Eggen, Olin J. (1992). "Asymptotic Giant Branch Stars Near the Sun". The Astronomical Journal. 104: 275. Bibcode:1992AJ....104..275E. doi:10.1086/116239.
- ^ a b c Khalatyan, A.; Anders, F.; Chiappini, C.; Queiroz, A. B. A.; Nepal, S.; Dal Ponte, M.; Jordi, C.; Guiglion, G.; Valentini, M.; Torralba Elipe, G.; Steinmetz, M.; Pantaleoni-González, M.; Malhotra, S.; Jiménez-Arranz, Ó.; Enke, H.; Casamiquela, L.; Ardèvol, J. (2024). "Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost". Astronomy and Astrophysics. 691: A98. arXiv:2407.06963. Bibcode:2024A&A...691A..98K. doi:10.1051/0004-6361/202451427.
- ^ a b c Van Belle, Gerard T.; von Braun, Kaspar; Ciardi, David R.; Pilyavsky, Genady; Buckingham, Ryan S.; Boden, Andrew F.; Clark, Catherine A.; Hartman, Zachary; Van Belle, Gerald; Bucknew, William; Cole, Gary (2021). "Direct Measurements of Giant Star Effective Temperatures and Linear Radii: Calibration against Spectral Types and V - K Color". The Astrophysical Journal. 922 (2): 163. arXiv:2107.09205. Bibcode:2021ApJ...922..163V. doi:10.3847/1538-4357/ac1687.
- ^ "HD 180450". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-10-14.
- ^ 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.
- ^ 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.
- ^ 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.
 | This giant-star-related article is a stub. You can help Wikipedia by expanding it. |