HR 4699

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]

HR 4699
Observation data
Epoch J2000      Equinox J2000
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 mas[1]
Distance201 ± 4 ly
(62 ± 1 pc)
Absolute magnitude (MV)1.18[2]
Details
Mass1.76[5] M☉
Radius9.92+0.11
−0.16[6] R☉
Luminosity43±1[6] L☉
Surface gravity (log g)3.01[7] cgs
Temperature4,707+38
−27[6] K
Metallicity [Fe/H]0.00±0.05[8] dex
Rotational velocity (v sin i)0.0[9] km/s
Age1.97[5] Gyr
Other designations
BD–12°3614, HD 107418, HIP 60221, HR 4699, SAO 157226[10]
Database references
SIMBADdata

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. van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
  2. 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. S2CID 119257644.
  3. Houk, Nancy; Smith-Moore, M. (1978). Michigan catalogue of two-dimensional spectral types for the HD stars. Vol. 4. Ann Arbor: Dept. of Astronomy, University of Michigan. Bibcode:1988mcts.book.....H.
  4. Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
  5. Luck, R. Earle (2015). "Abundances in the Local Region. I. G and K Giants". The Astronomical Journal. 150 (3): 88. arXiv:1507.01466. Bibcode:2015AJ....150...88L. doi:10.1088/0004-6256/150/3/88. S2CID 118505114.
  6. 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.
  7. Luck, R. Earle; Heiter, Ulrike (June 2007). "Giants in the Local Region". The Astronomical Journal. 133 (6): 2464–2486. Bibcode:2007AJ....133.2464L. doi:10.1086/513194.
  8. Gáspár, András; et al. (2016). "The Correlation between Metallicity and Debris Disk Mass". The Astrophysical Journal. 826 (2): 171. arXiv:1604.07403. Bibcode:2016ApJ...826..171G. doi:10.3847/0004-637X/826/2/171. S2CID 119241004.
  9. 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. Bibcode:2008AJ....135..209M. doi:10.1088/0004-6256/135/1/209. S2CID 121883397.
  10. "HD 107418". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-12-07.
  11. 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.
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