41 Comae Berenices

41 Comae Berenices is a single,[9] orange-hued star in the northern constellation of Coma Berenices. It is visible to the naked eye, having an apparent visual magnitude of 4.80.[2] Based upon an annual parallax shift of 9.8 mas,[1] it is located around 331 light years away. It is moving closer to the Earth with a heliocentric radial velocity of −17 km/s.[5]

41 Comae Berenices
Observation data
Epoch J2000      Equinox J2000
Constellation Coma Berenices
Right ascension  13h 07m 10.73003s[1]
Declination +27° 37′ 29.0585″[1]
Apparent magnitude (V) 4.80±0.02[2]
Characteristics
Evolutionary stage giant star
Spectral type K5-III[3]
B−V color index 1.482±0.003[4]
Astrometry
Radial velocity (Rv)−17.38±0.65[5] km/s
Proper motion (μ) RA: +33.68[1] mas/yr
Dec.: −69.18[1] mas/yr
Parallax (π)9.84 ± 0.22[1] mas
Distance331 ± 7 ly
(102 ± 2 pc)
Absolute magnitude (MV)−0.04[6]
Details[2]
Mass1.21±0.19 M☉
Radius33.75±0.77 R☉
Luminosity323.0±21.7 L☉
Surface gravity (log g)1.70 cgs
Temperature4,211±54 K
Metallicity [Fe/H]−0.09 dex
Rotational velocity (v sin i)1.8[7] km/s
Age4.51±1.84 Gyr
Other designations
36 Com, BD+28°2185, FK5 3045, HD 113996, HIP 64022, HR 4954, SAO 82659[8]
Database references
SIMBADdata

At the age of about 4.5 billion years, this is an evolved giant star with a stellar classification of K5-III,[3] currently on the red giant branch.[10] It has 1.2 times the mass of the Sun and, after consuming the hydrogen at its core, has expanded to 34 times the Sun's radius. The star is radiating 323 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,211 K.[2]

In 2017, one planet (HD 113996 b) was found orbiting it via the radial velocity method. The planet has a mass of at least 6.3±1.0 MJ, a semi-major axis of 1.6±0.1 AU, an orbital period of 610.2±3.8 d, and an eccentricity of 0.28±0.12.[10][11]

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.
  2. Baines, E.; et al. (2017), "Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer", The Astronomical Journal, 155 (1): 30, arXiv:1712.08109, Bibcode:2018AJ....155...30B, doi:10.3847/1538-3881/aa9d8b.
  3. Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
  4. 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.
  5. 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.
  6. Cardini, D. (January 2005), "Mg II chromospheric radiative loss rates in cool active and quiet stars", Astronomy and Astrophysics, 430: 303–311, arXiv:astro-ph/0409683, Bibcode:2005A&A...430..303C, doi:10.1051/0004-6361:20041440.
  7. De Medeiros, J. R.; et al. (November 2000), "Rotation and lithium in single giant stars", Astronomy and Astrophysics, 363: 239–243, arXiv:astro-ph/0010273, Bibcode:2000A&A...363..239D.
  8. "41 Com". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 7 January 2019.
  9. 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.
  10. Jeong, G.; et al. (February 2018), "Detection of planet candidates around K giants. HD 40956, HD 111591, and HD 113996", Astronomy & Astrophysics, 610: 8, arXiv:1711.07173, Bibcode:2018A&A...610A...3J, doi:10.1051/0004-6361/201629185, A3.
  11. HD 113996 b at the Open Exoplanet Catalogue. Available at http://exoplanet.eu/catalog/hd_113996_b/. Accessed 28 November 2017.
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