Mu2 Chamaeleontis

Mu2 Chamaeleontis (μ2 Cha) is a star located in the constellation Chamaeleon. It is not bright enough to be readily visible to the naked eye, having an apparent visual magnitude of 6.60, but has an absolute magnitude of 0.59.[2] The distance to this object is approximately 556 light years, based on the star's parallax.[1] The star's radial velocity is poorly constrained, but it appears to be drifting further away at the rate of around +3 km/s.[1]

For other stars with this Bayer designation, see μ Chamaeleontis.
μ2 Chamaeleontis
Observation data
Epoch J2000      Equinox J2000
Constellation Chamaeleon
Right ascension  10h 04m 07.14960s[1]
Declination −81° 33′ 55.7280″[1]
Apparent magnitude (V) 6.60[2]
Characteristics
Spectral type G6/8 III[3]
U−B color index +0.53[4]
B−V color index +0.919±0.002[2]
Variable type Suspected[5]
Astrometry
Radial velocity (Rv)+3.30±1.65[1] km/s
Proper motion (μ) RA: −47.094[1] mas/yr
Dec.: 49.541[1] mas/yr
Parallax (π)5.8632 ± 0.0583[1] mas
Distance556 ± 6 ly
(171 ± 2 pc)
Absolute magnitude (MV)0.59[2]
Details
Radius11.35+0.32
−0.16[1] R☉
Luminosity70.6±0.9[1] L☉
Temperature4,967+36
−69[1] K
Rotational velocity (v sin i)2.7±1.3[6] km/s
Other designations
CD−80°365, HD 88351, HIP 49326, HR 3997, SAO 258561[7]
Database references
SIMBADdata

This object is an aging G-type giant star with a stellar classification of G6/8 III.[3] Having exhausted the supply of hydrogen at its core, the star has cooled and expanded until now it has 11 times the girth of the Sun.[1] It is a suspected variable star of unknown type.[5] The star is radiating 71 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,967 K.[1]

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. 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.
  3. Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. 1. Bibcode:1975mcts.book.....H.
  4. Johnson, H. L. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99. Bibcode:1966CoLPL...4...99J.
  5. Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, GCVS 5.1, 61 (1): 80–88, Bibcode:2017ARep...61...80S.
  6. de Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (2014). "A catalog of rotational and radial velocities for evolved stars. V. Southern stars". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762.
  7. "HD 88351". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 19 August 2017.
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