Astronomy:75 Cancri
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Short description: Binary star system in the constellation Cancer
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[1] mas |
| 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 | |
| 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
- ↑ 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 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. doi:10.1088/0004-637X/719/2/1293. Bibcode: 2010ApJ...719.1293K.
- ↑ 3.0 3.1 Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode: 1986EgUBV........0M.
- ↑ "* 75 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=%2A+75+Cnc.
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