Astronomy:41 Comae Berenices
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[1] mas/yr Dec.: −69.539[1] mas/yr |
| Parallax (π) | 8.5989 ± 0.1327[1] mas |
| 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 |
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]
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 Jupiter mass, a semi-major axis of 1.6±0.1 astronomical unit|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
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 Baines, E. et al. (2017), "Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer", The Astronomical Journal 155 (1): 30, doi:10.3847/1538-3881/aa9d8b, Bibcode: 2018AJ....155...30B.
- ↑ 3.0 3.1 Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series 71: 245, doi:10.1086/191373, Bibcode: 1989ApJS...71..245K.
- ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ Cardini, D. (January 2005), "Mg II chromospheric radiative loss rates in cool active and quiet stars", Astronomy and Astrophysics 430: 303–311, doi:10.1051/0004-6361:20041440, Bibcode: 2005A&A...430..303C.
- ↑ De Medeiros, J. R. et al. (November 2000), "Rotation and lithium in single giant stars", Astronomy and Astrophysics 363: 239–243, Bibcode: 2000A&A...363..239D.
- ↑ "41 Com". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=41+Com.
- ↑ 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.
- ↑ 9.0 9.1 9.2 Jeong, G. et al. (February 2018), "Detection of planet candidates around K giants. HD 40956, HD 111591, and HD 113996", Astronomy & Astrophysics 610: 8, doi:10.1051/0004-6361/201629185, A3, Bibcode: 2018A&A...610A...3J.
- ↑ HD 113996 b at the Open Exoplanet Catalogue. Available at https://exoplanet.eu/catalog/hd_113996_b--6676/. Accessed 28 November 2017.
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