8 Cancri - Misplaced Pages

Star in the constellation Cancer

8 Cancri
Observation data Epoch J2000 Equinox J2000
Constellation	Cancer
Right ascension	08 05 04.48834
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 (R_v)	+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 (M_V)	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

8 Cancri is a single, white-hued star in the zodiac constellation of Cancer. It has an apparent visual magnitude of +5.14, 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, is around 215 light years. A radial velocity of +21 km/s indicates it is moving away from the Sun.

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

References

^ van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
^ Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
^ 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, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
^ 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, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
"8 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-02-09.
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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.

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