75 Cancri

Binary star system in the constellation Cancer

75 Cancri  Observation data
Epoch J2000 Equinox J2000

Constellation | Cancer
Right ascension | 09h 08m 47.33104s[1]
Declination | +26° 37′ 44.8062″[1]
Apparent magnitude (V) | 5.98[2]
Characteristics
Spectral type | G5 IV-V[2]
U−B color index | +0.20[3]
B−V color index | +0.65[3]
Astrometry
Radial velocity (Rv)| 9.7478(60)[2] km/s
Proper motion (μ)|  RA: −138.07[1] mas/yr
Dec.: −369.97[1] mas/yr
Parallax (π)| 32.004 ± 0.052 mas[1]
Distance| 101.9 ± 0.2 ly
(31.25 ± 0.05 pc)
Orbit[2]
Period (P)| 19.412347(23) d
Semi-major axis (a)| 5.8696(96) mas
Eccentricity (e)| 0.19494(11)
Inclination (i)| 19.412347(23)°
Longitude of the node (Ω)| 171.892(85)°
Periastron epoch (T)| JD 2453895.9025(24)
Argument of periastron (ω)
(secondary)| 283.389(39)°
Semi-amplitude (K1)
(primary)| 26.4961(35) km/s
Semi-amplitude (K2)
(secondary)| 30.7579(65) km/s
Details[2]
75 Cnc A
Mass| 1.173(24) M☉
Temperature| 6000 K
Metallicity [Fe/H]| −0.09 dex
75 Cnc B
Mass| 1.011(21) M☉
Temperature| 5900 K
Other designations

BD+27° 1715, FK5 2724, GJ 9286, HD 78418, HIP 44892, HR 3626, SAO 80659[4]

Database references
SIMBAD| data

75 Cancri (abbreviated to 75 Cnc) is a binary star in the constellation of Cancer. The system is located about 102 light-years (31 parsecs) away, based on its stellar properties.[2]

75 Cancri is a spectroscopic binary, which means the two stellar components are too close to be resolved, but periodic Doppler shifts in their spectra indicate orbital motion. In this case, light from both stars can be detected, and it is a double-lined spectroscopic binary. The orbital period of the system is 19.41 days, and the eccentricity of the system is 0.19494, implying a slightly elliptical orbit. The primary has a mass of 1.173 M☉, and is a G-type main-sequence star or subgiant. The secondary is less massive, at 1.011 M☉.[2]

## References

[edit]

1. ^ a b c d e van Leeuwen, F.; et al. (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. S2CID 18759600.653-664&rft.date=2007&rft_id=info:arxiv/0708.1752&rft_id=https://api.semanticscholar.org/CorpusID:18759600#id-name=S2CID&rft_id=info:doi/10.1051/0004-6361:20078357&rft_id=info:bibcode/2007A&A...474..653V;&rft.au=van+Leeuwen,+F.&rfr_id=info:sid/en.wikipedia.org:75+Cancri" class="Z3988">
2. ^ a b c d e f g Konacki, Maciej; et al. (2010). "High-precision Orbital and Physical Parameters of Double-lined Spectroscopic Binary Stars—HD78418, HD123999, HD160922, HD200077, and HD210027". The Astrophysical Journal. 719 (2): 1293–1314\. arXiv:0910.4482. Bibcode:2010ApJ...719.1293K. doi:10.1088/0004-637X/719/2/1293. S2CID 119253596.1293-1314&rft.date=2010&rft_id=info:arxiv/0910.4482&rft_id=https://api.semanticscholar.org/CorpusID:119253596#id-name=S2CID&rft_id=info:doi/10.1088/0004-637X/719/2/1293&rft_id=info:bibcode/2010ApJ...719.1293K&rft.aulast=Konacki&rft.aufirst=Maciej&rft.au=Muterspaugh,+Matthew+W.&rft.au=Kulkarni,+Shrinivas+R.&rft.au=Hełminiak,+Krzysztof+G.&rfr_id=info:sid/en.wikipedia.org:75+Cancri" class="Z3988">
3. ^ a b Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
4. ^ "* 75 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 21 August 2017.

* v
* t
* e

Constellation of Cancer

* Cancer in Chinese astronomy
* List of stars in Cancer

Stars|

| Bayer|

* α (Acubens)
* β (Tarf)
* γ (Asellus Borealis)
* δ (Asellus Australis)
* ε (Meleph)
* ζ1 (Tegmine)
* ζ2
* η
* θ
* ι
* κ
* λ (Piautos)
* μ1
* μ2
* ν
* ξ (Nahn)
* ο1
* ο2
* π1
* π2
* ρ1 (Copernicus)
* ρ2
* σ1
* σ2
* σ3
* τ
* υ1
* υ2
* φ1
* φ2
* χ
* ψ1
* ψ2
* ω1
* ω2

|

Flamsteed|

* 1
* 3
* 5
* 7
* 8
* 11
* 12
* 15
* 20 (d1)
* 21
* 24
* 25 (d2)
* 27
* 28 (CX)
* 29
* 34
* 35
* 36 (c)
* 37
* 38
* 39
* 40
* 42
* 44
* 45 (A1)
* 46
* 49 (b)
* 50 (A2)
* 53
* 54
* 57
* 60
* 61
* 66
* 67
* 68
* 70
* 71
* 75
* 78
* 79
* 80
* 83

Variable|

* R
* X
* RS
* VZ
* AZ
* DX
* EI
* HL
* HM

HD|

* 72945
* 72946
* 73534 (Gakyid)
* 79498

Other|

* GJ 3470 (Kaewkosin)
* HIP 41378
* K2-187
* LHS 2090
* Pr0211
* WD J0914+1914
* YBP 1194

| Exoplanets|

* 55 Cancri b
* c
* d
* e
* f
* β Cancri b
* GJ 3470 b
* HD 73534 b
* HIP 41378 b
* c
* d
* e
* f
* Pr0201 b

|

| Star clusters|

* Beehive Cluster
* Messier 67

|

| Nebulae|

* Abell 30
* Abell 31

|

Galaxies|

| NGC|

* 2503
* 2535
* 2536
* 2608
* 2623
* 2648
* 2775
* 2801
* 2803
* 2804
* 2812

|

Other|

* 3C 191
* 3C 212
* 3C 215
* DLA0817g
* IC 2431
* OJ 287
* QSO B0839+187
* UGC 4457
* 4C +29.30
* SDSS J0849+1114

| Galaxy clusters|

* Abell 671
* Musket Ball Cluster

|

Category

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*[Dec.:]: Declination
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