Astronomy:HR 4699
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Corvus |
| Right ascension | 12h 20m 55.71287s[1] |
| Declination | –13° 33′ 56.6100″[1] |
| Apparent magnitude (V) | +5.14[2] |
| Characteristics | |
| Spectral type | K0 III[3] |
| U−B color index | +0.93[4] |
| B−V color index | +1.048±0.003[2] |
| Astrometry | |
| Radial velocity (Rv) | +14.0±0.7[2] km/s |
| Proper motion (μ) | RA: –4.93[1] mas/yr Dec.: +9.86[1] mas/yr |
| Parallax (π) | 16.21 ± 0.29[1] mas |
| Distance | 201 ± 4 ly (62 ± 1 pc) |
| Absolute magnitude (MV) | 1.18[2] |
| Details | |
| Mass | 1.76[5] M☉ |
| Radius | 9.92+0.11 −0.16[6] R☉ |
| Luminosity | 43±1[6] L☉ |
| Surface gravity (log g) | 3.01[7] cgs |
| Temperature | 4,707+38 −27[6] K |
| Metallicity [Fe/H] | 0.00±0.05[8] dex |
| Rotational velocity (v sin i) | 0.0[9] km/s |
| Age | 1.97[5] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HR 4699 is a single[11] star in the southern constellation of Corvus. It is orange in hue and is dimly visible to the naked eye with an apparent visual magnitude of +5.14.[2] This star is located at a distance of approximately 201 light years from the Sun based on parallax.[1] It is drifting further away with a radial velocity of +14 km/s, after come to within 45.1 light-years some four million years ago.[2]
This is an aging giant star with a stellar classification of K0 III,[3] having exhausted the supply of hydrogen at its core then cooled and expanded to almost ten[6] times the Sun's radius. It is nearly two[5] billion years old with 1.76 times the mass of the Sun.[5] The star is radiating 43 times the luminosity of the Sun from its photosphere at an effective temperature of 4,707 K.[6]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 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 Houk, Nancy; Smith-Moore, M. (1978). Michigan catalogue of two-dimensional spectral types for the HD stars. 4. Ann Arbor: Dept. of Astronomy, University of Michigan. Bibcode: 1988mcts.book.....H.
- ↑ Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode: 1986EgUBV........0M. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?1986EgUBV........0M&db_key=AST&nosetcookie=1.
- ↑ 5.0 5.1 5.2 5.3 Luck, R. Earle (2015). "Abundances in the Local Region. I. G and K Giants". The Astronomical Journal 150 (3): 88. doi:10.1088/0004-6256/150/3/88. Bibcode: 2015AJ....150...88L.
- ↑ 6.0 6.1 6.2 6.3 6.4 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.
- ↑ Luck, R. Earle; Heiter, Ulrike (June 2007). "Giants in the Local Region". The Astronomical Journal 133 (6): 2464–2486. doi:10.1086/513194. Bibcode: 2007AJ....133.2464L.
- ↑ Gáspár, András et al. (2016). "The Correlation between Metallicity and Debris Disk Mass". The Astrophysical Journal 826 (2): 171. doi:10.3847/0004-637X/826/2/171. Bibcode: 2016ApJ...826..171G.
- ↑ Massarotti, Alessandro et al. (January 2008). "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity". The Astronomical Journal 135 (1): 209–231. doi:10.1088/0004-6256/135/1/209. Bibcode: 2008AJ....135..209M.
- ↑ "HD 107418". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+107418.
- ↑ 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. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E.
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