82 Cancri - Misplaced Pages

(Redirected from Pi2 Cancri) Star in the constellation Cancer

82 Cancri
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Location of 82 Cancri (circled)
Constellation	Cancer
Right ascension	09 15 13.85196
Declination	+14° 56′ 29.4401″
Apparent magnitude (V)	+5.33
Characteristics
Spectral type	K1 III
U−B color index	+1.31
B−V color index	+1.32
Astrometry

Radial velocity (R_v)	+27.49±0.19 km/s
Proper motion (μ)	RA: −40.874 mas/yr Dec.: −11.835 mas/yr
Parallax (π)	6.0793 ± 0.1222 mas
Distance	540 ± 10 ly (164 ± 3 pc)
Absolute magnitude (M_V)	−0.98

Details

Mass	2.56±0.13 `M`_☉
Radius	31.01+1.09 −3.52 `R`_☉
Luminosity	307.4±7.3 `L`_☉
Temperature	4,340+270 −74 K
Metallicity	−0.195±0.099 dex
Rotational velocity (v sin i)	1.3±1.0 km/s

Other designations
π Cnc, 82 Cancri, BD+15° 2009, FK5 2733, HD 79554, HIP 45410, HR 3669, SAO 98456
Database references
SIMBAD	data

82 Cancri is a solitary, orange-hued star in the zodiac constellation of Cancer. It has the Bayer designation Pi Cancri, which is Latinized from π Cancri; 82 Cancri is the star's Flamsteed designation. The star lies just a degree to the south of the ecliptic. With an apparent visual magnitude of +5.33, it is dimly visible to the naked eye on a dark night. This star is located at a distance of approximately 540 light years from the Sun based on parallax. At that range, the visual magnitude is diminished by an extinction of 0.10 magnitudes due to interstellar dust. It is drifting further away with a radial velocity of +27 km/s.

This is an evolved K-type giant star with a stellar classification of K1 III, having exhausted the supply of hydrogen at its core then cooled and expanded off the main sequence. The star currently has 31 times the girth of the Sun and is spinning slowly with a projected rotational velocity. It is radiating over 300 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,340 K. Based on its abundance of iron, the star has a lower abundances of heavier elements than the Sun.

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.
^ Rybka, E. (1969), "The corrected magnitudes and colours of 278 stars near S.A. 1-139 in the UBV system", Acta Astronomica, 19: 229, Bibcode:1969AcA....19..229R.
^ 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.
^ 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.
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.
Kervella, Pierre; et al. (March 2019), "Stellar and substellar companions of nearby stars from Gaia DR2. Binarity from proper motion anomaly", Astronomy & Astrophysics, 623: 23, arXiv:1811.08902, Bibcode:2019A&A...623A..72K, doi:10.1051/0004-6361/201834371, S2CID 119491061, A72
^ Taylor, B. J. (February 1999), "Catalogs of temperatures and averages for evolved G and K stars", Astronomy and Astrophysics Supplement, 134 (3): 523–524, Bibcode:1999A&AS..134..523T, doi:10.1051/aas:1999153.
De Medeiros, J. R.; et al. (2014), "A catalog of rotational and radial velocities for evolved stars", Astronomy and Astrophysics, 561, A126, arXiv:1312.3474, Bibcode:2014A&A...561A.126D, doi:10.1051/0004-6361/201220762, S2CID 54046583.
"pi.02 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-06-14.
Sinnott, Roger W.; Perryman, Michael A. C. (1997), Millennium Star Atlas, vol. 2, Sky Publishing Corporation and the European Space Agency, p. 711, ISBN 0-933346-83-2.
Famaey, B.; et al. (January 2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics, 430 (1): 165–186, arXiv:astro-ph/0409579, Bibcode:2005A&A...430..165F, doi:10.1051/0004-6361:20041272, S2CID 17804304.

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

See also

References