82 Cancri

82 Cancri is a solitary,[3] orange-hued star in the zodiac constellation of Cancer. It has the Bayer designation Pi2 Cancri, which is Latinized from π2 Cancri; 82 Cancri is the star's Flamsteed designation. The star lies just a degree to the south of the ecliptic.[10] With an apparent visual magnitude of +5.33,[2] 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.[11] It is drifting further away with a radial velocity of +27 km/s.[4]

For other stars with this Bayer designation, see π Cancri.
82 Cancri
Location of 82 Cancri (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Cancer
Right ascension 09h 15m 13.85196s[1]
Declination +14° 56′ 29.4401″[1]
Apparent magnitude (V) +5.33[2]
Characteristics
Spectral type K1 III[3]
U−B color index +1.31[2]
B−V color index +1.32[2]
Astrometry
Radial velocity (Rv)+27.49±0.19[4] km/s
Proper motion (μ) RA: −40.874[1] mas/yr
Dec.: −11.835[1] mas/yr
Parallax (π)6.0793 ± 0.1222 mas[1]
Distance540 ± 10 ly
(164 ± 3 pc)
Absolute magnitude (MV)−0.98[5]
Details
Mass2.56±0.13[6] M☉
Radius31.01+1.09
−3.52[1] R☉
Luminosity307.4±7.3[1] L☉
Temperature4,340+270
−74[1] K
Metallicity [Fe/H]−0.195±0.099[7] dex
Rotational velocity (v sin i)1.3±1.0[8] km/s
Other designations
π2 Cnc, 82 Cancri, BD+15° 2009, FK5 2733, HD 79554, HIP 45410, HR 3669, SAO 98456[9]
Database references
SIMBADdata

This is an evolved K-type giant star with a stellar classification of K1 III,[3] having exhausted the supply of hydrogen at its core then cooled and expanded off the main sequence. The star currently has 31[1] 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.[1] Based on its abundance of iron, the star has a lower abundances of heavier elements than the Sun.[7]

References
  1. 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.
  2. 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.
  3. 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.
  4. 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.
  5. 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.
  6. 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
  7. Taylor, B. J. (February 1999), "Catalogs of temperatures and [Fe/H] 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.
  8. 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.
  9. "pi.02 Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-06-14.
  10. 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.
  11. 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.
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