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]
| 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 mas[1] |
| Distance | 417 ± 9 ly (128 ± 3 pc) |
| Absolute magnitude (MV) | 0.73[2] |
| Details | |
| Radius | 14.73+0.39 −0.52[1] R☉ |
| Luminosity | 98.5±2.6[1] L☉ |
| Temperature | 4,737+86 −61[1] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
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
edit- ^ a b c d e f g h i j k 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.
- ^ a b c d e f 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.
- ^ Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 1, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1975mcts.book.....H.
- ^ a b "zet01 mus". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-08-20.
- ^ 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.
- ^ a b 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.
- ^ 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.