Iota1 Muscae

ι1 Muscae, Latinised as Iota1 Muscae, is a solitary[8] star in the southern constellation of Musca, near the southern constellation border with Chamaeleon. It is visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude is 5.05.[2] The star is located around 222 light years distant from the Sun based on parallax, and is drifting further away with a radial velocity of 27.5 km/s.[4]

For other stars with this Bayer designation, see ι Muscae.
ι1 Muscae
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Musca
Right ascension  13h 25m 07.11942s[1]
Declination −74° 53′ 16.1512″[1]
Apparent magnitude (V) 5.05[2]
Characteristics
Spectral type K0 III[3]
U−B color index +1.01[2]
B−V color index +1.11[2]
Astrometry
Radial velocity (Rv)27.5±0.8[4] km/s
Proper motion (μ) RA: −107.80[5] mas/yr
Dec.: −132.25[5] mas/yr
Parallax (π)14.7839 ± 0.1205[1] mas
Distance221 ± 2 ly
(67.6 ± 0.6 pc)
Absolute magnitude (MV)+0.88[6]
Details
Radius11.78+0.22
−0.47[1] R☉
Luminosity56.5±0.6[1] L☉
Temperature4,610+96
−42[1] K
Other designations
ι1 Mus, CPD−74°1057, FK5 3070, HD 116244, HIP 65468, HR 5042, SAO 257041[7]
Database references
SIMBADdata

This object is an aging giant star with a stellar classification of K0III;[3] a star that has used up its core hydrogen and is cooling and expanding. At present it has nearly 12[1] times the girth of the Sun. The star is radiating 56.5 times the luminosity of the Sun from its swollen photosphere at an effective temperature of about 4,610 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. Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99), Bibcode:1966CoLPL...4...99J.
  3. Houk, Nancy; Cowley, A. P. (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
  4. de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, A61.
  5. van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
  6. 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.
  7. "iot02 Mus". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-09-11.
  8. 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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