Binary star in the constellation Coma Berenices

HD 106760  Observation data
Epoch J2000 Equinox J2000

Constellation | Coma Berenices
Right ascension | 12h 16m 30.12328s[1]
Declination | +33° 03′ 41.4198″[1]
Apparent magnitude (V) | 4.99[2]
Characteristics
Spectral type | K0.5 III–IIIb[3]
B−V color index | 1.140±0.002[2]
Astrometry
Radial velocity (Rv)| −40.4±0.3[2] km/s
Proper motion (μ)|  RA: −41.979[1] mas/yr
Dec.: −105.115[1] mas/yr
Parallax (π)| 10.2417 ± 0.2354 mas[1]
Distance| 318 ± 7 ly
(98 ± 2 pc)
Absolute magnitude (MV)| 0.06[2]
Orbit[4]
Period (P)| 3.598 years (1,314.3 d)
Eccentricity (e)| 0.43
Longitude of the node (Ω)| 303.6°
Periastron epoch (T)| 2441468.5 JD
Semi-amplitude (K1)
(primary)| 6.5 km/s
Details[5]
Mass| 1.85±0.14 M☉
Radius| 16.79±0.79 R☉
Luminosity| 112[6] L☉
Surface gravity (log g)| 2.48±0.10 cgs
Temperature| 4,581±28 K
Metallicity [Fe/H]| −0.12±0.05 dex
Rotational velocity (v sin i)| 0.9[6] km/s
Age| 1.57±0.32 Gyr
Other designations

BD+33° 2213, FK5 2983, HD 106760, HIP 59856, HR 4668, SAO 62928[7]

Database references
SIMBAD| data

HD 106760 is a single-lined spectroscopic binary[8] star system in the northern constellation of Coma Berenices. It is faintly visible to the naked eye, having an apparent visual magnitude of 4.99.[2] The system is located around 38 light years away, as determined from its annual parallax shift of 10.2417 mas.[1] It is moving closer with a heliocentric radial velocity of −40 km/s, and is expected to come as close as 259 ly in about 772,000 years.[2]

The variable radial velocity of HD 106760 was announced by W. W. Campbell of Lick Observatory in 1922, indicating the binary nature of this system. A preliminary orbit was determined by Mount Wilson Observatory astronomer W. H. Christie in 1936, then refined by English astronomer R. F. Griffin in 1984.[8] The components of this system orbit each other with a period of 3.6 years and an eccentricity of 0.43.[4]

The visible component has a stellar classification of K0.5 III–IIIb,[3] indicating it is an evolved K-type giant star. It is around 1.6 billion years old with 1.9 times the mass of the Sun and has expanded to 17 times the Sun's radius.[5] The star is radiating 112[6] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,581 K.[5]

## References[edit]

1. ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051.
2. ^ a b c d e f Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
3. ^ a b 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
4. ^ a b Pourbaix, D.; et al. (2004), "SB9: The Ninth Catalogue of Spectroscopic Binary Orbits", Astronomy & Astrophysics, 424: 727–732, arXiv:astro-ph/0406573, Bibcode:2004A&A...424..727P, doi:10.1051/0004-6361:20041213, S2CID 119387088.
5. ^ a b c Maldonado, J.; Villaver, E. (April 2016), "Evolved stars and the origin of abundance trends in planet hosts", Astronomy & Astrophysics, 588: 11, arXiv:1602.00835, Bibcode:2016A&A...588A..98M, doi:10.1051/0004-6361/201527883, S2CID 119212009, A98.
6. ^ a b c Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209, S2CID 121883397.
7. ^ "HD 106760". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-13.
8. ^ a b Griffin, R. F. (June 1984), "Spectroscopic binaries near the North Galactic Pole. X - HR 4668", Journal of Astrophysics and Astronomy, 5: 181−185, Bibcode:1984JApA....5..181G, doi:10.1007/BF02714990, S2CID 124007568.

* v
* t
* e

Constellation of Coma Berenices

* List of stars in Coma Berenices
* Coma Berenices in Chinese astronomy

Stars|

| Bayer|

* α (Diadem)
* β
* γ

|

Flamsteed|

* 7
* 11
* 12
* 13
* 14
* 16
* 17
* 21
* 23
* 24
* 31
* 35
* 36
* 37
* 41

Variable|

* FK
* GP
* IN
* LW

HR|

* 4668

HD|

* 107146
* 108863
* 108874
* 114762
* b
* 115404

Other|

* 2MASS J12195156+3128497
* KELT-6
* WASP-56
* WISE 1217+1626

| Exoplanets|

* HD 108874 b
* c
* KELT-6b
* c

|

| Star clusters|

* Coma Star Cluster
* Messier 53
* NGC 4147
* NGC 5053

|

| Nebulae|

* LoTr 5

|

Galaxies|

| Messier|

* 64 (Black Eye Galaxy)
* 85
* 88
* 91
* 98
* 99
* 100

|

NGC|

* 4055
* 4056
* 4060
* 4061
* 4065
* 4066
* 4070
* 4072
* 4074
* 4076
* 4084
* 4086
* 4089
* 4090
* 4091
* 4092
* 4093
* 4095
* 4098
* 4150
* 4203
* 4208
* 4212
* 4222
* 4237
* 4262
* 4274
* 4278
* 4293
* 4298
* 4302
* 4308
* 4312
* 4314
* 4323
* 4340
* 4394
* 4414
* 4448
* 4450
* 4455
* 4459
* 4468
* 4473
* 4474
* 4477
* 4479
* 4489
* 4494
* 4498
* 4506
* 4515
* 4516
* 4523
* 4540
* 4555
* 4559
* 4561
* 4565
* 4571
* 4595
* 4633
* 4634
* 4651
* 4659
* 4676 (Mice Galaxies)
* 4689
* 4710
* 4725
* 4860
* 4871
* 4872
* 4873
* 4874
* 4875
* 4876
* 4881
* 4882
* 4883
* 4886
* 4889
* 4892
* 4895
* 4896
* 4907
* 4911
* 4919
* 4921
* 5000
* 5004

Other|

* Coma Berenices
* Dragonfly 44
* IC 755 (NGC 4019)
* IOK-1
* LEDA 83677
* Malin 1
* PGC 44691

| Galaxy clusters|

* Abell 1413
* Coma I
* Coma Cluster
* M94 Group
* NGC 4631 Group

|

| Astronomical events|

* GRB 050509B
* iPTF14atg
* SN 1940B
* SN 1979C
* SN 2005ap
* SN 2006X
* SN 2020oi
* VIRGOHI21

|

Category
*[RA:]: Right Ascension
*[Dec.:]: Declination
*[v]: View this template
*[t]: Discuss this template
*[e]: Edit this template