41 Comae Berenices is a single,[8] 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 8.6 mas, it is located around 379 light years away. It is moving closer to the Earth with a heliocentric radial velocity of −16 km/s.[1]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Coma Berenices |
| Right ascension | 13h 07m 10.72992s[1] |
| Declination | +27° 37′ 29.0554″[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) | −15.89±0.13[1] km/s |
| Proper motion (μ) | RA: +34.155 mas/yr[1] Dec.: −69.539 mas/yr[1] |
| Parallax (π) | 8.5989 ± 0.1327 mas[1] |
| Distance | 379 ± 6 ly (116 ± 2 pc) |
| Absolute magnitude (MV) | −0.04[5] |
| Details[2] | |
| Mass | 1.21±0.19 M☉ |
| Radius | 33.75±0.77 R☉ |
| Luminosity | 323.0±21.7 L☉ |
| Surface gravity (log g) | 1.70 cgs |
| Temperature | 4,211±54 K |
| Metallicity [Fe/H] | −0.09 dex |
| Rotational velocity (v sin i) | 1.8[6] km/s |
| Age | 4.51±1.84 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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.[9] 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.[9][10]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥6.3±1.0 MJ | 1.6±0.1 | 610.2±3.8 | 0.28±0.12 | — | — |
References
edit- ^ a b c d e f Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b c d 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, S2CID 119427037.
- ^ a b 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.
- ^ 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.
- ^ 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, S2CID 12136256.
- ^ 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.
- ^ "41 Com". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 7 January 2019.
- ^ 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.
- ^ a b c 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, S2CID 119209663, A3.
- ^ HD 113996 b at the Open Exoplanet Catalogue. Available at https://exoplanet.eu/catalog/hd_113996_b--6676/. Accessed 28 November 2017.