Beta Comae Berenices

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Template:Short description

Beta Comae Berenices
File:Coma Berenices constellation map.png
Location of β Coma Bernices (upper left)
Observation data
Epoch J2000      Equinox J2000
Constellation Coma Berenices
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 4.26[2]
Characteristics
Spectral type G0 V[3]
U−B Template:Engvar +0.08[2]
B−V Template:Engvar +0.58[4]
Astrometry
Radial velocity (Rv)+6.1[5] km/s
Proper motion (μ) RA: -803.372 ± 1.370[6] mas/yr
Dec.: +882.512 ± 0.526[6] mas/yr
Parallax (π)108.8951±0.3487 mas[6]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)4.46[7]
Details
Mass1.15[8] Template:Solar mass
RadiusScript error: No such module "val".[9] Template:Solar radius
LuminosityScript error: No such module "val".[10] Template:Solar luminosity
Surface gravity (log g)4.38[4] cgs
TemperatureScript error: No such module "val".[10] K
Metallicity [Fe/H]+0.07[4] dex
RotationScript error: No such module "val".[11] days
Rotational velocity (v sin i)4.10 ± 0.06[12] km/s
Age1.5–2.5[13] Gyr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
43 Com, β Com, BD+28°2193, FK5 492, Gl 502, HD 114710, HIP 64394, HR 4983, LHS 348, LTT 13815, SAO 82706.[14]
Database references
SIMBADdata

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File:Beta Comae Berenices.jpg
β Comae Berenices in optical light

Beta Comae Berenices (β Comae Berenices, β Com) is a solar-type star in the northern constellation of Coma Berenices. It is located at a distance of about Script error: No such module "convert". from Earth. The Greek letter beta (β) usually indicates that the star has the second highest visual magnitude in the constellation. However, with an apparent visual magnitude of 4.3,[2] this star is actually slightly brighter than α Comae Berenices. It can be seen with the naked eye, but may be too dim to be viewed from a built-up urban area.

The star has a stellar classification of G0 V,[3] compared to G2 V for the Sun. It has a mass of 1.15 solar masses[8] and a radius of 1.14 solar radii.[9] The effective temperature of the outer envelope is 5,936 K,[10] giving it a yellow hue of a G-type star.[15] In terms of age it is younger than the Sun, being about 2 billion years old.[13]

Observations of short term variations in the chromatic activity suggest that the star undergoes differential rotation,[16] with a rotation period of about 11–13 days.[12] Its surface has a measured activity cycle of 16.6 years, compared to 11 years on the Sun. It may also have a secondary activity cycle of 9.6 years.[17] At one time it was thought that this star might have a spectroscopic companion. However, this was ruled out by means of more accurate radial velocity measurements. No planets have yet been detected around it, and there is no evidence of a dusty disk.

The habitable zone for this star, defined as the locations where liquid water could be present on an Earth-like planet, is 0.918–1.96 AU, where 1 AU is the average distance from the Earth to the Sun.[18]

See also

References

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  1. ↑ a b Script error: No such module "citation/CS1". Note: see VizieR catalogue I/311.
  2. ↑ a b c Script error: No such module "citation/CS1".
  3. ↑ a b Script error: No such module "citation/CS1".
  4. ↑ a b c Script error: No such module "citation/CS1".
  5. ↑ Script error: No such module "citation/CS1".
  6. ↑ a b c Template:Cite DR2
  7. ↑ Script error: No such module "citation/CS1".
  8. ↑ a b Script error: No such module "citation/CS1". Note: see VizieR catalogue J/ApJS/168/297.
  9. ↑ a b Script error: No such module "citation/CS1".
  10. ↑ a b c Script error: No such module "citation/CS1".. See Table 10.
  11. ↑ Script error: No such module "citation/CS1".
  12. ↑ a b Script error: No such module "citation/CS1".
  13. ↑ a b Script error: No such module "citation/CS1".
  14. ↑ Script error: No such module "citation/CS1".
  15. ↑ Script error: No such module "citation/CS1".
  16. ↑ Script error: No such module "citation/CS1".
  17. ↑ Script error: No such module "citation/CS1". See appendix A.
  18. ↑ Script error: No such module "citation/CS1".

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External links

Template:Stars of Coma Berenices

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