Zeta1 Muscae

Zeta1 Muscae, Latinized from ζ1 Muscae and abbreviated ζ1 Mus, is a suspected astrometric binary[5] star system in the constellation Musca, located 2.6° west of Beta Muscae.[6] It is bright enough to be visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of 5.73,[2] forming a visual pair with nearby Zeta2 Muscae.[6] The ζ1 Mus system is around 417 light-years distant from the Sun, based on parallax, and is drifting further away with a radial velocity of +21 km/s.[2]

For other star systems with this Bayer designation see ζ Muscae
Zeta1 Muscae
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Musca
Right ascension 12h 22m 12.04737s[1]
Declination −68° 18′ 26.3733″[1]
Apparent magnitude (V) 5.73[2]
Characteristics
Spectral type K0III[3]
B−V color index +1.038±0.004[2]
Astrometry
Radial velocity (Rv)+21.13±0.40[2] km/s
Proper motion (μ) RA: −8.017[1] mas/yr
Dec.: −49.773[1] mas/yr
Parallax (π)7.8246 ± 0.1781[1] mas
Distance417 ± 9 ly
(128 ± 3 pc)
Absolute magnitude (MV)0.73[2]
Details
Radius14.73+0.39
−0.52[1] R☉
Luminosity98.5±2.6[1] L☉
Temperature4,737+86
−61[1] K
Other designations
ζ1 Mus, CPD−67°1939, HD 107567, HIP 60329, HR 4704, SAO 251868[4]
Database references
SIMBADdata

The suspected astrometric component of the ζ1 Mus system was identified from acceleration behavior in the proper motion of the main star.[7] The visible component is an aging giant star with a stellar classification of K0III;[4] a star that has used up its core hydrogen and is cooling and expanding. It now has 15[1] times the girth of the Sun and is radiating 98.5[1] times the Sun's luminosity from its swollen photosphere at an effective temperature of 4,737 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, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 1, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1975mcts.book.....H.
  4. "zet01 mus". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-08-20.
  5. 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.
  6. Streicher, M. (April 2006), "Musca, the Heavenly Fly", Monthly Notes of the Astronomical Society of South Africa, 65 (3 and 4): 56–59, Bibcode:2006MNSSA..65...56S.
  7. Makarov, V. V.; Kaplan, G. H. (May 2005), "Statistical Constraints for Astrometric Binaries with Nonlinear Motion", The Astronomical Journal, 129 (5): 2420–2427, Bibcode:2005AJ....129.2420M, doi:10.1086/429590.
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