55 Cancri information

55 Cancri
	Location of 55 Cancri (circled in red)
Observation data; Epoch J2000.0 Equinox J2000.0
Constellation	Cancer
Pronunciation	/ˈkæŋkraɪ/ or /ˈkæŋkriː/
	55 Cancri A
Right ascension	08h 52m 35.8111s
Declination	+28° 19′ 50.955″
Apparent magnitude (V)	5.95
	55 Cancri B
Right ascension	08h 52m 40.8627s
Declination	+28° 19′ 58.821″
Apparent magnitude (V)	13.15
Characteristics
55 Cancri A
Evolutionary stage	Main sequence or subgiant
Spectral type	K0IV–V
U−B color index	0.63
B−V color index	0.87
55 Cancri B
Evolutionary stage	Main sequence (red dwarf)
Spectral type	M4.5V
B−V color index	1.7
Astrometry
55 Cancri A
Radial velocity (Rv)	27.51 km/s
Proper motion (μ)	RA: −485.681±0.040 mas/yr ; Dec.: −233.517±0.037 mas/yr
Parallax (π)	79.4482 ± 0.0429 mas
Distance	41.05 ± 0.02 ly ; (12.587 ± 0.007 pc)
Absolute magnitude (MV)	+5.50
55 Cancri B
Proper motion (μ)	RA: −481.176±0.041 mas/yr ; Dec.: −244.544±0.032 mas/yr
Parallax (π)	79.6560 ± 0.0475 mas
Distance	40.95 ± 0.02 ly ; (12.554 ± 0.007 pc)
Absolute magnitude (MV)	+12.58±0.088
Details
55 Cnc A
Mass	0.905±0.015 M☉
Radius	0.943±0.010 R☉
Luminosity	0.582±0.014 L☉
Surface gravity (log g)	4.45±0.01 cgs
Temperature	5,172±18 K
Metallicity [Fe/H]	0.35±0.10 dex
Rotation	38.8±0.05 days
Rotational velocity (v sin i)	<1.23±0.01 km/s
Age	8.6±1 Gyr
55 Cnc B
Mass	0.264±0.007 M☉
Radius	0.268±0.009 R☉
Luminosity	0.00788±0.00013 L☉
Temperature	3,320±51 K
Metallicity [Fe/H]	0.15±0.16 dex
Rotation	6.11+3.2; −1.9 days
Rotational velocity (v sin i)	2.36 km/s
Other designations
	Copernicus, Rho1 Cancri, 55 Cnc, BD+28°1660, GJ 324, HD 75732, HIP 43587, HR 3522, SAO 80585
Database references
SIMBAD	data
	55 Cnc B
Exoplanet Archive	data
ARICNS	data

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).

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.

^ ^a ^b ^c ^d ^e ^f ^g Cite error: The named reference edr3a was invoked but never defined (see the help page).
^ Cite error: The named reference vanbelle was invoked but never defined (see the help page).
^ ^a ^b ^c ^d ^e Cite error: The named reference edr3b was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference ucac4 was invoked but never defined (see the help page).
^ Cite error: The named reference nstars was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference hr was invoked but never defined (see the help page).
^ Cite error: The named reference carmenes was invoked but never defined (see the help page).
^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
^ ^a ^b ^c Cite error: The named reference houdebine was invoked but never defined (see the help page).
^ ^a ^b ^c ^d Cite error: The named reference vonbraun2011 was invoked but never defined (see the help page).
^ ^a ^b ^c ^d ^e Cite error: The named reference Bourrier2018 was invoked but never defined (see the help page).
^ ^a ^b ^c ^d ^e Cite error: The named reference Carmenes2019 was invoked but never defined (see the help page).
^ Cite error: The named reference IAU-CSN was invoked but never defined (see the help page).

[edr3a-1] ^ ^a ^b ^c ^d ^e ^f ^g Cite error: The named reference edr3a was invoked but never defined (see the help page).

[vanbelle-2] Cite error: The named reference vanbelle was invoked but never defined (see the help page).

[edr3b-3] Cite error: The named reference edr3b was invoked but never defined (see the help page).

[ucac4-4] Cite error: The named reference ucac4 was invoked but never defined (see the help page).

[nstars-5] Cite error: The named reference nstars was invoked but never defined (see the help page).

[hr-6] Cite error: The named reference hr was invoked but never defined (see the help page).

[carmenes-7] Cite error: The named reference carmenes was invoked but never defined (see the help page).

[Anderson2012-8] Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).

[houdebine-9] Cite error: The named reference houdebine was invoked but never defined (see the help page).

[vonbraun2011-10] Cite error: The named reference vonbraun2011 was invoked but never defined (see the help page).

[Bourrier2018-11] Cite error: The named reference Bourrier2018 was invoked but never defined (see the help page).

[Carmenes2019-12] Cite error: The named reference Carmenes2019 was invoked but never defined (see the help page).

[IAU-CSN-13] Cite error: The named reference IAU-CSN was invoked but never defined (see the help page).

Observation data Epoch J2000.0 Equinox J2000.0
Location of 55 Cancri (circled in red)
Constellation	Cancer
Pronunciation	/ˈkæŋkraɪ/ or /ˈkæŋkriː/
55 Cancri A
Right ascension	08^h 52^m 35.8111^s^[1]
Declination	+28° 19′ 50.955″^[1]
Apparent magnitude (V)	5.95^[2]
55 Cancri B
Right ascension	08^h 52^m 40.8627^s^[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 (R_v)	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 (M_V)	+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 (M_V)	+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
Copernicus, Rho¹ Cancri, 55 Cnc, BD+28°1660, GJ 324, HD 75732, HIP 43587, HR 3522, SAO 80585
Database references
SIMBAD	data
	55 Cnc B
Exoplanet Archive	data
ARICNS	data

55 Cancri information

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