Astronomy:8 Vulpeculae
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Vulpecula |
| Right ascension | 19h 28m 57.08327s[1] |
| Declination | 24° 46′ 07.2656″[1] |
| Apparent magnitude (V) | 5.82[2] |
| Characteristics | |
| Spectral type | K0 III[3] |
| B−V color index | 1.023±0.005[2] |
| Astrometry | |
| Radial velocity (Rv) | −28.58±0.20[2] km/s |
| Proper motion (μ) | RA: 8.750[1] mas/yr Dec.: 16.334[1] mas/yr |
| Parallax (π) | 7.1397 ± 0.0739[1] mas |
| Distance | 457 ± 5 ly (140 ± 1 pc) |
| Absolute magnitude (MV) | −0.16[2] |
| Details | |
| Mass | 3.07[4] M☉ |
| Radius | 13.8+0.2 −0.4[1] R☉ |
| Luminosity | 100.5±1.3[1] L☉ |
| Surface gravity (log g) | 2.63[4] cgs |
| Temperature | 4,915+71 −30[1] K |
| Metallicity [Fe/H] | +0.11[4] dex |
| Age | 324[5] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
8 Vulpeculae is star located about 457[1] light years away in the northern constellation of Vulpecula.[6] It lies just 7′ from Alpha Vulpeculae and the two form an optical double.[7] 8 Vulpeculae is visible to the naked eye as a faint, yellow-orange hued star with an apparent visual magnitude of 5.82. It is moving closer to the Earth with a heliocentric radial velocity of −29 km/s.[2]
This is an aging giant star with a stellar classification of K0 III,[3] which indicates it has exhausted the hydrogen supply at its core and evolved away from the main sequence. It is 324[5] million years old with three[4] times the mass of the Sun and has expanded to 14[1] times the Sun's radius. The star is radiating 100[1] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,915 K.[1]
References
- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 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.
- ↑ 2.0 2.1 2.2 2.3 2.4 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 Yoss, Kenneth M. (November 1961), "Spectral and Luminosity Classifications and Measurements of the Strength of Cyanogen Absorption for Late-Type Stars from Objective-Prism Spectra.", Astrophysical Journal 134: 809, doi:10.1086/147209, Bibcode: 1961ApJ...134..809Y
- ↑ 4.0 4.1 4.2 4.3 Liu, Y. J. et al. (April 2014), "The Lithium Abundances of a Large Sample of Red Giants", The Astrophysical Journal 785 (2): 12, doi:10.1088/0004-637X/785/2/94, 94, Bibcode: 2014ApJ...785...94L.
- ↑ 5.0 5.1 Takeda, Yoichi et al. (August 2008), "Stellar parameters and elemental abundances of late-G giants", Publications of the Astronomical Society of Japan 60 (4): 781–802, doi:10.1093/pasj/60.4.781, Bibcode: 2008PASJ...60..781T
- ↑ 6.0 6.1 "8 Vul". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=8+Vul.
- ↑ Mason, Brian D. et al. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal 122 (6): 3466–3471. doi:10.1086/323920. ISSN 0004-6256. Bibcode: 2001AJ....122.3466M.
External links
- 8 Vulpeculae on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
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