54 Cancri

54 Cancri
Observation data; Epoch J2000 Equinox J2000
Constellation	Cancer
Right ascension	08h 51m 01.4644s[1]
Declination	+15° 21′ 02.364″[1]
Apparent magnitude (V)	6.38[2]
Characteristics
Spectral type	G5 V[3]
B−V color index	0.629±0.020[2]
Astrometry
Radial velocity (Rv)	+45.098±0.032[2] km/s
Proper motion (μ)	RA: −112.475[1] mas/yr ; Dec.: +75.099[1] mas/yr
Parallax (π)	24.79 ± 0.33[1] mas
Distance	132 ± 2 ly ; (40.3 ± 0.5 pc)
Absolute magnitude (MV)	3.39[2]
Details[2]
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[4]
Database references
SIMBAD	data

54 Cancri is a star in the zodiac constellation of Cancer. It has an apparent visual magnitude of 6.38,[2] 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.[2]

Measurement of the stars proper motion over time suggest changes due to an acceleration component, which may indicate it is a close binary system.[5] The visible component has a stellar classification of G5 V,[3] 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.[3] 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.[2]

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, 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.

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[Gaia2016-1] 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, A2.

[Niedzielski2016-2] 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.

[Hall2007-3] 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.

[SIMBAD-4] "54 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-02-09.

[mason1999-5] 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.