12 Comae Berenices

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12 Comae Berenices

12 Comae Berenices in optical light
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Coma Berenices
Right ascension 12h 22m 30.31076s[1]
Declination +25° 50′ 46.1896″[1]
Apparent magnitude (V) 4.80[2]
Characteristics
Spectral type F6 III + A3 V[3]
U−B color index 0.47/0.09[2]
B−V color index 0.82/0.11[2]
Distance
276 ± 5 ly
(85 ± 2 pc)
Absolute magnitude (MV)0.55±0.06 / 1.05±0.06[2]
Semi-amplitude
(K1)
(primary)		22.42±2.22 km/s
Details
Myr
12 Com B
Mass2.05±0.2 M☉
Radius2.5±0.3 R☉
Luminosity30.2+2.2
−2.2 L☉
Temperature8,500±500 K
HR 4707, SAO 82273, WDS J12225+2551A[7]
Database references
SIMBADdata

12 Comae Berenices is a

spectroscopic binary with an orbital period of 396.5 days and an eccentricity of 0.566.[6]

This system consists of two

Sun's luminosity from its enlarged photosphere at an effective temperature of 5,300 K. Its companion, component B, has double the Sun's mass and 2.5 times the radius. It shines with 30 times the luminosity of the Sun at 8,500 K.[2]

References

  1. ^
    doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR
    .
  2. ^
    doi:10.1002/asna.201011514
  3. ^
    doi:10.1086/525529
    .
  4. Bibcode:1967IAUS...30...57E
    .
  5. S2CID 119387088
    .
  6. ^
    doi:10.1051/0004-6361:20078007
    .
  7. ^ "12 Com". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved December 30, 2018.
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