8 Cancri

8 Cancri
Observation data; Equinox J2000.0]] (ICRS)
Constellation	Cancer
Right ascension	08h 05m 04.48834s
Declination	+13° 07′ 05.5757″
Apparent magnitude (V)	+5.14
Characteristics
Spectral type	A1 V
B−V color index	0.018±0.005
Astrometry
Radial velocity (Rv)	+21.0±4.2 km/s
Proper motion (μ)	RA: −35.78 mas/yr ; Dec.: −63.81 mas/yr
Parallax (π)	15.20 ± 0.32 mas
Distance	215 ± 5 ly ; (66 ± 1 pc)
Absolute magnitude (MV)	1.05
Details
Mass	2.37 M☉
Luminosity	36.6 L☉
Surface gravity (log g)	4.29±0.14 cgs
Temperature	10,352±352 K
Rotational velocity (v sin i)	173 km/s
Age	144 Myr
Other designations
	8 Cnc, BD+13°1831, FK5 2625, GC 10959, HD 66664, HIP 39567, HR 3163, SAO 97542
Database references
SIMBAD	data

Short description: Star in the constellation Cancer

8 Cancri is a single,^[7] white-hued star in the zodiac constellation of Cancer. It has an apparent visual magnitude of +5.14,^[2] which indicates it is faintly visible to the naked eye under suitable viewing conditions. The distance to this star, as determined from its annual parallax shift of 15.20 mas,^[1] is around 215 light years. A radial velocity of +21 km/s indicates it is moving away from the Sun.^[4]

This is an A-type main-sequence star with a stellar classification of A1 V.^[3] It is a young star with an estimated age of just 144^[5] million years, and has a high rate of spin with a projected rotational velocity of 173 km/s.^[5] 8 Cancri has 2.37^[5] times the mass of the Sun and is radiating 36.6^[2] times the Sun's luminosity from its photosphere at an effective temperature of around 10,352 K.^[5]

References

↑ ^1.0 ^1.1 ^1.2 ^1.3 ^1.4 ^1.5 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 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
↑ ^3.0 ^3.1 Cowley, A. et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal 74: 375–406, doi:10.1086/110819, Bibcode: 1969AJ.....74..375C.
↑ ^4.0 ^4.1 de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics 546: 14, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D.
↑ ^5.0 ^5.1 ^5.2 ^5.3 ^5.4 ^5.5 ^5.6 ^5.7 ^5.8 David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal 804 (2): 146, doi:10.1088/0004-637X/804/2/146, Bibcode: 2015ApJ...804..146D.
↑ "8 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=8+Cnc.
↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869–879, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.

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[vanLeeuwen2007-1] 1.0 ^1.1 ^1.2 ^1.3 ^1.4 ^1.5 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.

[Anderson2012-2] 2.0 ^2.1 ^2.2 ^2.3 ^2.4 ^2.5 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.

[Cowley1969-3] 3.0 ^3.1 Cowley, A. et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal 74: 375–406, doi:10.1086/110819, Bibcode: 1969AJ.....74..375C.

[deBruijne2012-4] 4.0 ^4.1 de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics 546: 14, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D.

[David2015-5] 5.0 ^5.1 ^5.2 ^5.3 ^5.4 ^5.5 ^5.6 ^5.7 ^5.8 David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal 804 (2): 146, doi:10.1088/0004-637X/804/2/146, Bibcode: 2015ApJ...804..146D.

[SIMBAD-6] "8 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=8+Cnc.

[Eggleton2008-7] Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869–879, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.

Observation data Equinox J2000.0]] (ICRS)
Constellation	Cancer
Right ascension	08^h 05^m 04.48834^s^[1]
Declination	+13° 07′ 05.5757″^[1]
Apparent magnitude (V)	+5.14^[2]
Characteristics
Spectral type	A1 V^[3]
B−V color index	0.018±0.005^[2]
Astrometry

Radial velocity (R_v)	+21.0±4.2^[4] km/s
Proper motion (μ)	RA: −35.78^[1] mas/yr Dec.: −63.81^[1] mas/yr
Parallax (π)	15.20 ± 0.32^[1] mas
Distance	215 ± 5 ly (66 ± 1 pc)
Absolute magnitude (M_V)	1.05^[2]

Details

Mass	2.37^[5] `M`_☉
Luminosity	36.6^[2] `L`_☉
Surface gravity (log g)	4.29±0.14^[5] cgs
Temperature	10,352±352^[5] K
Rotational velocity (v sin i)	173^[5] km/s
Age	144^[5] Myr

Other designations
8 Cnc, BD+13°1831, FK5 2625, GC 10959, HD 66664, HIP 39567, HR 3163, SAO 97542^[6]
Database references
SIMBAD	data