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]