55 Cancri
Binary star with at least five exoplanets 41 light-years away / From Wikipedia, the free encyclopedia
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For other stars with this Bayer designation, see ρ Cancri.
55 Cancri is a binary star system located 41[1] light-years away from the Sun in the zodiac constellation of Cancer. It has the Bayer designation Rho1 Cancri (ρ1 Cancri); 55 Cancri is the Flamsteed designation (abbreviated 55 Cnc). The system consists of a K-type star (designated 55 Cancri A, also named Copernicus /koʊˈpɜːrnɪkəs/)[13] and a smaller red dwarf (55 Cancri B).
Quick Facts Observation data Epoch J2000.0 Equinox J2000.0, Pronunciation ...
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Cancer |
Pronunciation | /ˈkæŋkraɪ/ or /ˈkæŋkriː/ |
55 Cancri A | |
Right ascension | 08h 52m 35.8111s[1] |
Declination | +28° 19′ 50.955″[1] |
Apparent magnitude (V) | 5.95[2] |
55 Cancri B | |
Right ascension | 08h 52m 40.8627s[3] |
Declination | +28° 19′ 58.821″[3] |
Apparent magnitude (V) | 13.15[4] |
Characteristics | |
55 Cancri A | |
Evolutionary stage | Main sequence or subgiant |
Spectral type | K0IV–V[5] |
U−B color index | 0.63[6] |
B−V color index | 0.87[6] |
55 Cancri B | |
Evolutionary stage | Main sequence (red dwarf) |
Spectral type | M4.5V[7] |
B−V color index | 1.7[4] |
Astrometry | |
55 Cancri A | |
Radial velocity (Rv) | 27.51[1] km/s |
Proper motion (μ) | RA: −485.681±0.040[1] mas/yr Dec.: −233.517±0.037[1] mas/yr |
Parallax (π) | 79.4482 ± 0.0429 mas[1] |
Distance | 41.05 ± 0.02 ly (12.587 ± 0.007 pc) |
Absolute magnitude (MV) | +5.50[8] |
55 Cancri B | |
Proper motion (μ) | RA: −481.176±0.041[3] mas/yr Dec.: −244.544±0.032[3] mas/yr |
Parallax (π) | 79.6560 ± 0.0475 mas[3] |
Distance | 40.95 ± 0.02 ly (12.554 ± 0.007 pc) |
Absolute magnitude (MV) | +12.58±0.088[9] |
Details | |
55 Cnc A | |
Mass | 0.905±0.015[10] M☉ |
Radius | 0.943±0.010[10] R☉ |
Luminosity | 0.582±0.014[10] L☉ |
Surface gravity (log g) | 4.45±0.01[10] cgs |
Temperature | 5,172±18[11] K |
Metallicity [Fe/H] | 0.35±0.10[11] dex |
Rotation | 38.8±0.05 days[11] |
Rotational velocity (v sin i) | <1.23±0.01[11] km/s |
Age | 8.6±1[11] Gyr |
55 Cnc B | |
Mass | 0.264±0.007[12] M☉ |
Radius | 0.268±0.009[12] R☉ |
Luminosity | 0.00788±0.00013[12] L☉ |
Temperature | 3,320±51[12] K |
Metallicity [Fe/H] | 0.15±0.16[12] dex |
Rotation | 6.11+3.2 −1.9 days[9] |
Rotational velocity (v sin i) | 2.36[9] km/s |
Other designations | |
Database references | |
SIMBAD | data |
55 Cnc B | |
Exoplanet Archive | data |
ARICNS | data |
Close
As of 2015[update], five extrasolar planets (designated 55 Cancri b, c, d, e and f; named Galileo, Brahe, Lipperhey, Janssen and Harriot, respectively) are known to orbit 55 Cancri A.