HD 180450 is a single[8] star in the northern constellation of Lyra, positioned about half a degree to the NNW of the globular cluster M56.[9] 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 950 light years from the Sun based on parallax measurements, but is drifting closer with a radial velocity of −64.4 km/s.[4]
| Observation data Epoch J2000.0 Equinox ICRS | |
|---|---|
| Constellation | Lyra[1] |
| Right ascension | 19h 15m 24.859s[2] |
| Declination | +30° 31′ 34.98″[2] |
| Apparent magnitude (V) | 5.88[1] |
| Characteristics | |
| Evolutionary stage | AGB[3] |
| Spectral type | M1IIIab[1] |
| U−B color index | +2.03[citation needed] |
| B−V color index | +1.665±0.007[1] |
| Astrometry | |
| Radial velocity (Rv) | −64.43±0.23[4] km/s |
| Proper motion (μ) | RA: 34.374 mas/yr[2] Dec.: −26.212 mas/yr[2] |
| Parallax (π) | 3.4206±0.0625 mas[2] |
| Distance | 950 ± 20 ly (292 ± 5 pc) |
| Absolute magnitude (MV) | −2.03[1] |
| Details | |
| Mass | 1.4[5] M☉ |
| Radius | 84[6] R☉ |
| Luminosity | 1,218[6] L☉ |
| Surface gravity (log g) | 1.58[5] cgs |
| Temperature | 3,733[6] K |
| Metallicity [Fe/H] | −0.23[5] dex |
| Other designations | |
| BD+30°3491, GC 26550, HD 180450, HIP 94630, HR 7302, SAO 68040, GSC 02653-01682[7] | |
| Database references | |
| SIMBAD | data |
This is an aging red giant star with a stellar classification of M1IIIab.[1] It is currently on the asymptotic giant branch,[10] having exhausted the supply of hydrogen in its core and evolved off the main sequence. The star has expanded to ~68 times the radius of the Sun and is radiating a thousand times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,947 K.[4]
References
edit- 1 2 3 4 5 6 7 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.
- 1 2 3 4 5 Vallenari, A.; et al. (Gaia collaboration) (2023), "Gaia Data Release 3. Summary of the content and survey properties", Astronomy and Astrophysics, 674: A1, arXiv:2208.00211, Bibcode:2023A&A...674A...1G, doi:10.1051/0004-6361/202243940, S2CID 244398875. Gaia DR3 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.
- 1 2 3 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.
- 1 2 3 Khalatyan, A.; et al. (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.
- 1 2 3 Van Belle, Gerard T.; et al. (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.
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