Mu1 Chamaeleontis

μ1 Chamaeleontis, Latinized as Mu1 Chamaeleontis, is a single[9] star in the southern circumpolar constellation of Chamaeleon. It is a white-hued star that is dimly visible to the naked eye with an apparent visual magnitude of 5.53.[2] Based upon parallax measurements, it is located approximately 408 light-years' distance from the Sun.[1] The radial velocity is poorly constrained, but it appears to be drifting further away at the rate of about +16 km/s.[5]

For other stars with this Bayer designation, see μ Chamaeleontis.
μ1 Chamaeleontis
Observation data
Epoch J2000      Equinox J2000
Constellation Chamaeleon
Right ascension 10h 00m 43.79873s[1]
Declination −82° 12′ 52.8128″[1]
Apparent magnitude (V) 5.53[2]
Characteristics
Spectral type A0IV[3]
U−B color index +0.05[4]
B−V color index +0.035±0.001[2]
Astrometry
Radial velocity (Rv)+16±10[5] km/s
Proper motion (μ) RA: -26.639[1] mas/yr
Dec.: +31.129[1] mas/yr
Parallax (π)7.9879 ± 0.1013[1] mas
Distance408 ± 5 ly
(125 ± 2 pc)
Absolute magnitude (MV)+0.23[2]
Details
Luminosity65.65[6] L☉
Surface gravity (log g)4.15[7] cgs
Temperature8,720 K[6] K
Other designations
μ1 Cha, CPD−81° 399, FK5 3980, HD 87971, HIP 49065, HR 3983, SAO 258554[8]
Database references
SIMBADdata

This object has a stellar classification of A0IV,[3] matching an A-type subgiant star.[3] It has an absolute magnitude of +0.23,[2] and is radiating 66 times the luminosity of the Sun from its photosphere at an effective temperature of 8,720 K.[6]

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". 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. Kharchenko, N. V.; et al. (2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ~55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten. 328 (9): 889. arXiv:0705.0878. Bibcode:2007AN....328..889K. doi:10.1002/asna.200710776.
  6. McDonald, I.; et al. (2012). "Fundamental parameters and infrared excesses of Hipparcos stars". Monthly Notices of the Royal Astronomical Society. 427: 343. arXiv:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x.
  7. Davis, Philip A.; Egret, D. (1980). "An Analysis of the Hauck / Mermilliod Catalogue of Homgeneous Four-Color Data - Part Two". Astronomy and Astrophysics Supplement. 40: 199. Bibcode:1980A&AS...40..199P.
  8. "mu. Cha". SIMBAD. Centre de données astronomiques de Strasbourg.
  9. 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.
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