HD 177809
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Lyra[1] |
| Right ascension | 19h 04m 58.2870s[2] |
| Declination | +30° 44′ 00.257″[2] |
| Apparent magnitude (V) | 6.07[1] |
| Characteristics | |
| Evolutionary stage | AGB[3] |
| Spectral type | M3- IIIab[1] |
| B−V color index | +1.575[1] |
| Astrometry | |
| Radial velocity (Rv) | −19.35[4] km/s |
| Proper motion (μ) | RA: +31.265[2] mas/yr Dec.: −25.486[2] mas/yr |
| Parallax (π) | 4.9114±0.0698 mas[2] |
| Distance | 664 ± 9 ly (204 ± 3 pc) |
| Absolute magnitude (MV) | −0.39[1] |
| Details | |
| Mass | 1.3[5] M☉ |
| Radius | 50[6] R☉ |
| Luminosity | 477[6] L☉ |
| Surface gravity (log g) | 1.81[5] cgs |
| Temperature | 3,798[6] K |
| Metallicity [Fe/H] | −0.22[5] dex |
| Other designations | |
| BD+30°3409, GC 26264, HD 177809, HIP 93720, HR 7238, SAO 67781[7] | |
| Database references | |
| SIMBAD | data |
HD 177809 is a 6th magnitude star in the constellation Lyra, approximately 664 light years away from Earth. It is a red giant star of the spectral type M3- IIIab<, meaning it possesses a surface temperature of under 4,000 K. In comparison to the Sun, it is much larger and brighter, but its surface is cooler.
References
[edit]- ^ a b c d e 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 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.
- ^ 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.
- ^ 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 Fetherolf, Tara; Pepper, Joshua; Simpson, Emilie; Kane, Stephen R.; Močnik, Teo; English, John Edward; Antoci, Victoria; Huber, Daniel; Jenkins, Jon M.; Stassun, Keivan; Twicken, Joseph D.; Vanderspek, Roland; Winn, Joshua N. (2023). "Variability Catalog of Stars Observed during the TESS Prime Mission". The Astrophysical Journal Supplement Series. 268 (1): 4. arXiv:2208.11721. Bibcode:2023ApJS..268....4F. doi:10.3847/1538-4365/acdee5.
- ^ "HD 177809". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2025-05-05.
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