11 Comae Berenices

11 Comae Berenices
Location of 11 Comae Berenices (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Coma Berenices
Right ascension 12h 20m 43.027s[1]
Declination +17° 47′ 34.33″[1]
Apparent magnitude (V) 4.74
Characteristics
Spectral type K0 III[2]
Astrometry
Proper motion (μ) RA: −108.81±0.29[1] mas/yr
Dec.: 89.44±0.14[1] mas/yr
Parallax (π)11.25 ± 0.22[1] mas
Distance290 ± 6 ly
(89 ± 2 pc)
Details[2]
Radius15.781±0.3444 R☉
Luminosity109.51±4.3256 L☉
Temperature4705±24 K
Metallicity [Fe/H]−0.30 dex
Other designations
BD+18 2592, FK5 2987, HD 107383, HIP 60202, HR 4697, SAO 100053[3]
Database references
SIMBADdata

11 Comae Berenices (11 Com) is an orange giant K0 III star in the constellation of Coma Berenices, located in the sky, east and slightly north of Denebola in Leo, but not nearly as far east as ε Virginis in Virgo. It is about a degree from the elliptical galaxy M85 and two degrees north of the spiral galaxy M100. Its apparent magnitude is 4.74.

11 Com is a low metallicity star with an iron abundance about half that of the Sun.[2]

11 Com has a substellar companion with a minimum mass of about 19.4 Jupiter masses orbiting at about 1.3 AU around it. The object's mass is well within the range of deuterium burning brown dwarfs.[4][5]

The 11 Comae Berenices system
Companion MassSemimajor axis
(AU)		Orbital periodEccentricityDiscovery year
b≥19.4 ± 1.5 MJ1.29 ± 0.05326.03 ± 0.32 days0.231 ± 0.0052007

References

  1. 1 2 3 4 5 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. Vizier catalog entry
  2. 1 2 3 von Braun, Kaspar; et al. (2014). "Stellar diameters and temperatures – V. 11 newly characterized exoplanet host stars". Monthly Notices of the Royal Astronomical Society. 438 (3): 2413–2425. arXiv:1312.1792. Bibcode:2014MNRAS.438.2413V. doi:10.1093/mnras/stt2360.
  3. ↑ "* 11 Com". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 8 September 2012.
  4. ↑ Liu, Y.‐J.; et al. (2008). "A Substellar Companion to the Intermediate‐Mass Giant 11 Comae". The Astrophysical Journal. 672: 553–557. arXiv:0709.0645. Bibcode:2008ApJ...672..553L. doi:10.1086/523297.
  5. ↑ 11 Com -b


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