54 Cancri - Misplaced Pages

Star in the constellation Cancer

54 Cancri
Observation data Epoch J2000 Equinox J2000
Constellation	Cancer
Right ascension	08 51 01.4644
Declination	+15° 21′ 02.364″
Apparent magnitude (V)	6.38
Characteristics
Spectral type	G5 V-IV or G1V
B−V color index	0.629±0.020
Astrometry

Radial velocity (R_v)	+45.098±0.032 km/s
Proper motion (μ)	RA: −112.475 mas/yr Dec.: +75.099 mas/yr
Parallax (π)	24.79 ± 0.33 mas
Distance	132 ± 2 ly (40.3 ± 0.5 pc)
Absolute magnitude (M_V)	3.39

Details

Mass	1.23±0.05 `M`_☉
Radius	1.81±0.20 `R`_☉
Luminosity	3.72+0.55 −0.48 `L`_☉
Surface gravity (log g)	4.04±0.04 cgs
Temperature	5,862±15 K
Rotational velocity (v sin i)	3.10±0.56 km/s
Age	5.0+0.7 −0.4 Gyr

Other designations
54 Cnc, BD+15° 1917, FK5 2699, HD 75528, HIP 43454, HR 3510, SAO 98168
Database references
SIMBAD	data

54 Cancri is a star in the zodiac constellation of Cancer. It has an apparent visual magnitude of 6.38, which places it just below the normal brightness limit of stars visible to the naked eye. The annual parallax shift is 24.79 mas as measured from Earth's orbit, which yields a distance estimate of about 132 light years. It is moving away from the Sun with a radial velocity of +45 km/s.

Measurement of the stars proper motion over time suggest changes due to an acceleration component, which may indicate it is a close binary system. The visible component has a stellar classification of G5 V, indicating it is an ordinary G-type main-sequence star that is generating energy through hydrogen fusion in its core region. Hall et al. (2007) classify it as a low-activity variable star. The star is about five billion years old with a projected rotational velocity of 3.1 km/s. It has 1.23 times the mass of the Sun and 1.81 times the Sun's radius.

References

^ Gaia Collaboration; et al. (November 2016), "Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties", Astronomy & Astrophysics, 595: 23, arXiv:1609.04172, Bibcode:2016A&A...595A...2G, doi:10.1051/0004-6361/201629512, S2CID 1828208, A2.
^ Niedzielski, A.; et al. (January 2016), "The Penn State - Toruń Centre for Astronomy Planet Search stars", Astronomy & Astrophysics, 585: 14, arXiv:1407.4956, Bibcode:2016A&A...585A..73N, doi:10.1051/0004-6361/201527362, A73.
^ Hall, Jeffrey C.; et al. (March 2007), "The Activity and Variability of the Sun and Sun-like Stars. I. Synoptic Ca II H and K Observations", The Astronomical Journal, 133 (3): 862–881, Bibcode:2007AJ....133..862H, doi:10.1086/510356.
^ "54 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-02-09.
Mason, Brian D.; et al. (1999), "Speckle Interferometry of New and Problem HIPPARCOS Binaries", The Astronomical Journal, 117 (4): 1890−1904, Bibcode:1999AJ....117.1890M, doi:10.1086/300823.

Constellation of Cancer

Stars

Bayer	α (Acubens) β (Tarf) γ (Asellus Borealis) δ (Asellus Australis) ε (Meleph) ζ (Tegmine) ζ η θ ι κ λ (Piautos) μ μ ν ξ (Nahn) ο ο π π ρ (Copernicus) ρ σ σ σ τ υ υ φ φ χ ψ ψ ω ω
Flamsteed	1 3 5 7 8 11 12 15 20 (d) 21 24 25 (d) 27 28 (CX) 29 34 35 36 (c) 37 38 39 40 42 44 45 (A) 46 49 (b) 50 (A) 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