Iota1 Muscae

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For other stars with this Bayer designation, see ι Muscae.
Iota1 Muscae
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Musca
Right ascension 13h 25m 07.11916s[1]
Declination −74° 53′ 16.1478″[1]
Apparent magnitude (V) 5.05[2]
Spectral type K0 III[3]
U−B color index +1.01[2]
B−V color index +1.11[2]
Radial velocity (Rv) 27.5±0.8[4] km/s
Proper motion (μ) RA: −107.80[1] mas/yr
Dec.: −132.25[1] mas/yr
Parallax (π) 14.75 ± 0.19[1] mas
Distance 221 ± 3 ly
(67.8 ± 0.9 pc)
Radius 11[5] R
Other designations
ι1 Mus, CPD−°74 1057, FK5 3070, HD 116244, HIP 65468, HR 5042, SAO 257041.[6]

Iota1 Muscae is a solitary[7] star in the constellation Musca. Its apparent magnitude is 5.04. Located around 67.80 parsecs (221.1 ly) distant, it is an orange giant of spectral type K0III, a star that has used up its core hydrogen and is cooling and expanding. The measured angular diameter is 1.50±0.02 mas.[8] At the estimated distance of the star, this yields a physical size of about 11 times the radius of the Sun.[5]


  1. ^ a b c d e van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752Freely accessible, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c 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, 
  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:1208.3048Freely accessible, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, A61. 
  5. ^ a b Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1.  The radius (R*) is given by:
  6. ^ "iot01 Mus -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-03-15. 
  7. ^ 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:0806.2878Freely accessible, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x. 
  8. ^ Richichi, A.; et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431 (2): 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039.