Astronomy:Zeta1 Muscae
  | |
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Musca[1] |
| Right ascension | 12h 22m 12.02893s[2] |
| Declination | −68° 18′ 26.4093″[2] |
| Apparent magnitude (V) | 5.73[1] |
| Characteristics | |
| Evolutionary stage | Red-giant branch[2] |
| Spectral type | K0III[3] |
| B−V color index | +1.038±0.004[1] |
| Astrometry | |
| Radial velocity (Rv) | +21.13±0.40[1] km/s |
| Proper motion (μ) | RA: −1.467[2] mas/yr Dec.: −47.437[2] mas/yr |
| Parallax (π) | 9.1234 ± 0.2059[2] mas |
| Distance | 357 ± 8 ly (110 ± 2 pc) |
| Absolute magnitude (MV) | 0.73[1] |
| Details | |
| Mass | 2.80[2] M☉ |
| Radius | 12.1 or 14.1[2] R☉ |
| Luminosity | 82[2] L☉ |
| Surface gravity (log g) | 2.531[2] cgs |
| Temperature | 5,000[2] K |
| Metallicity [Fe/H] | −0.21[4] dex |
| Rotational velocity (v sin i) | 3.92[4] km/s |
| Age | 456[2] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Zeta1 Muscae, Latinized from ζ1 Muscae and abbreviated ζ1 Mus, is a suspected astrometric binary[6] star system in the constellation Musca, located 2.6° west of Beta Muscae.[7] 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,[1] forming a visual pair with nearby Zeta2 Muscae.[7] 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.[1]
The suspected astrometric component of the ζ1 Mus system was identified from acceleration behavior in the proper motion of the main star.[8] The visible component is an aging giant star with a stellar classification of K0III;[5] a star that has used up its core hydrogen and is cooling and expanding. It now has 12 or 14 times the radius of the Sun and is radiating 82 times the Sun's luminosity from its swollen photosphere at an effective temperature of 5,000 K.[2]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A XHIP record for this object at VizieR.
- ↑ 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 2.11 2.12 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 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.
- ↑ 4.0 4.1 Perdelwitz, V.; Trifonov, T.; Teklu, J. T.; Sreenivas, K. R.; Tal-Or, L. (2024). "Analysis of the public HARPS/ESO spectroscopic archive. Ca II H&K time series for the HARPS radial velocity database". Astronomy and Astrophysics 683. doi:10.1051/0004-6361/202348263. Bibcode: 2024A&A...683A.125P.
- ↑ 5.0 5.1 "zet01 mus". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=zet01+mus.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ 7.0 7.1 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, doi:10.1086/429590, Bibcode: 2005AJ....129.2420M.
 |  |
