Astronomy:HD 177809
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Short description: Red giant star in the constellation Lyra
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[2] mas |
| 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 | |
| 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
- ↑ 1.0 1.1 1.2 1.3 1.4 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A XHIP record for this object at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ Eggen, Olin J. (1992). "Asymptotic Giant Branch Stars Near the Sun". The Astronomical Journal 104: 275. doi:10.1086/116239. Bibcode: 1992AJ....104..275E.
- ↑ Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 5.0 5.1 5.2 Khalatyan, A.; Anders, F.; Chiappini, C.; Queiroz, A. B. A.; Nepal, S.; Dal Ponte, M.; Jordi, C.; Guiglion, G. et al. (2024). "Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost". Astronomy and Astrophysics 691: A98. doi:10.1051/0004-6361/202451427. Bibcode: 2024A&A...691A..98K.
- ↑ 6.0 6.1 6.2 Fetherolf, Tara; Pepper, Joshua; Simpson, Emilie; Kane, Stephen R.; Močnik, Teo; English, John Edward; Antoci, Victoria; Huber, Daniel et al. (2023). "Variability Catalog of Stars Observed during the TESS Prime Mission". The Astrophysical Journal Supplement Series 268 (1): 4. doi:10.3847/1538-4365/acdee5. Bibcode: 2023ApJS..268....4F.
- ↑ "HD 177809". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+177809.
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