35 Comae Berenices

35 Comae Berenices is a multiple star system in the northern constellation of Coma Berenices, located about 6° from the north galactic pole. It is faintly visible to the naked eye with an apparent visual magnitude of 4.93.[2] Based upon parallax measurements, it is located around 280 light years from the Sun.[1] The system is moving closer to the Earth with a heliocentric radial velocity of −6 km/s.[4]

35 Comae Berenices
Observation data
Epoch J2000      Equinox J2000
Constellation Coma Berenices
Right ascension  12h 53m 17.74703s[1]
Declination +21° 14′ 41.8092″[1]
Apparent magnitude (V) 4.93[2]
Characteristics
Spectral type G5 III + F:[2]
U−B color index 0.65[3]
B−V color index 0.90[3]
Astrometry
Radial velocity (Rv)−6.091±0.075[4] km/s
Proper motion (μ) RA: −37.66[1] mas/yr
Dec.: −30.14[1] mas/yr
Parallax (π)11.52 ± 0.87[1] mas
Distance280 ± 20 ly
(87 ± 7 pc)
Orbit[5]
Period (P)539.4±95.4 yr
Semi-major axis (a)1.405±0.046″
Eccentricity (e)0.208±0.100
Inclination (i)28.4±13.4°
Longitude of the node (Ω)238.7±2.7°
Periastron epoch (T)1949.4±7.9
Argument of periastron (ω)
(secondary)		251.6±7.3°
Other designations
35 Com, BD+22°2519, HD 112033, HIP 62886, HR 4894, SAO 82550, WDS J12533+2115AB[6]
Database references
SIMBADdata

This was found to be a wide binary by Struve in 1828,[3] but it has completed less than half an orbit since then and the orbital elements remain poorly constrained. It has an orbital period of 539±95 years and an eccentricity of 0.2±0.1.[5] The pair have been resolved into stellar classifications of an evolved G-type giant primary of class G5 III and an F-type secondary,[2] most likely main sequence with a class of F1 V.[3] The primary component is a spectroscopic binary[3] with a period of 7.9624 ± 0.0117 years and an eccentricity of 0.63.[4] A fourth component, 35 Com C, is located 29″ from the primary and may have a physical association.[3]

References
  1. 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.
  2. 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.
  3. Griffin, R. F.; et al. (March 1988), "The giant spectroscopic binary 35 Comae", Publications of the Astronomical Society of the Pacific, 100: 358–361, Bibcode:1988PASP..100..358G, doi:10.1086/132177.
  4. Halbwachs, J.-L.; et al. (May 2012), "Double stars with wide separations in the AGK3 - I. Components that are themselves spectroscopic binaries", Monthly Notices of the Royal Astronomical Society, 422 (1): 14–24, Bibcode:2012MNRAS.422...14H, doi:10.1111/j.1365-2966.2012.20308.x.
  5. Drummond, Jack D. (March 2014), "Binary Stars Observed with Adaptive Optics at the Starfire Optical Range", The Astronomical Journal, 147 (3): 10, Bibcode:2014AJ....147...65D, doi:10.1088/0004-6256/147/3/65, 65.
  6. "35 Com". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-01-05.
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