Misplaced Pages

39 Cancri

Article snapshot taken from Wikipedia with creative commons attribution-sharealike license. Give it a read and then ask your questions in the chat. We can research this topic together.

Star in the constellation Cancer

39 Cancri
Observation data Epoch J2000.0 Equinox J2000.0
Constellation	Cancer
Right ascension	08 40 06.41823
Declination	+20° 00′ 28.0339″
Apparent magnitude (V)	6.39
Characteristics
Spectral type	G8+ III-IIIb
B−V color index	0.98
Astrometry

Radial velocity (R_v)	33.88 km/s
Proper motion (μ)	RA: −35.610 mas/yr Dec.: −11.964 mas/yr
Parallax (π)	5.3162 ± 0.0589 mas
Distance	614 ± 7 ly (188 ± 2 pc)

Details

Mass	2.88 `M`_☉
Radius	12 `R`_☉
Luminosity	105 `L`_☉
Surface gravity (log g)	2.70±0.11 cgs
Temperature	4,954±25 K
Metallicity	+0.21±0.05 dex
Age	460 Myr

Other designations
39 Cnc, BD+20°2158, HD 73665, HIP 42516, HR 3427, SAO 80333
Database references
SIMBAD	data

39 Cancri is a star in the constellation Cancer, located about 614 light years from the Sun in the Beehive Cluster (NGC 2632). It is a challenge to see with the naked eye, having an apparent visual magnitude of 6.39. This object is moving further from the Earth with a heliocentric radial velocity of 34 km/s.

This is an evolved giant star with a stellar classification of G8+ III-IIIb, indicating it has consumed the hydrogen at its core. It is 460 million years old with 2.88 times the mass of the Sun and about 12 times the Sun's radius. The star is radiating 105 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,954 K.

References

^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
^ Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal, 150 (3), 88, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, S2CID 118505114.
^ Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", The Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
^ Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (Third ed.): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
^ Prugniel, Ph.; et al. (July 2011), "The atmospheric parameters and spectral interpolator for the MILES stars", Astronomy & Astrophysics, 531: A165, arXiv:1104.4952, Bibcode:2011A&A...531A.165P, doi:10.1051/0004-6361/201116769, S2CID 54940439.
"39 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-03-03.

v
t
e

Constellation of Cancer

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

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

39 Cancri Add topic