Iota2 Muscae

ι2 Muscae, Latinised as Iota2 Muscae, is a blue-white hued star in the southern constellation Musca, near the souther constellation border with Chamaeleon. It has an apparent visual magnitude of 6.62,[2] which is just below the normal limit of stellar brightness visible to the naked eye. Based upon parallax measurements, it is located around 508 light-years (156 pc) from the Sun. It is a member of the Hyades Stream, but is not part of the Hyades or Praesepe open clusters.[7]

For other stars with this Bayer designation, see ι Muscae.
Iota2 Muscae
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Grus
Right ascension 13h 27m 18.49881s[1]
Declination −74° 41′ 30.3200″[1]
Apparent magnitude (V) 6.62[2]
Characteristics
Evolutionary stage main sequence[3]
Spectral type B9V[4]
B−V color index −0.056±0.004[2]
Astrometry
Radial velocity (Rv)−3.0±7.4[5] km/s
Proper motion (μ) RA: +35.155[1] mas/yr
Dec.: +13.846[1] mas/yr
Parallax (π)6.4238 ± 0.0523[1] mas
Distance508 ± 4 ly
(156 ± 1 pc)
Absolute magnitude (MV)0.61[2]
Details
Mass2.74±0.05[3] M☉
Luminosity73.3+8.0
−7.2[3] L☉
Temperature10,641+99
−97[3] K
Rotational velocity (v sin i)116[3] km/s
Other designations
ι2 Mus, CD−74° 793, HD 116579, HIP 65628, HR 5051, SAO 257047[6]
Database references
SIMBADdata

This is a B-type main-sequence star with a stellar classification of B9V.[4] It has a high rate of spin, showing a projected rotational velocity of 116 km/s.[3] The star has 2.7[3] times the mass of the Sun and is radiating 73[3] times the Sun's luminosity from its photosphere at an effective temperature of about 10,641 K.[3]

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. 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.
  3. Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691.
  4. Houk, Nancy (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
  5. 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.
  6. "iot02 Mus". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-08-26.
  7. Eggen, O. J.; Iben, Icko, Jr. (1988), "Starbursts, binary stars, and blue stragglers in local superclusters and groups. I - The very young disk and young disk populations", Astronomical Journal, 96: 635–669, Bibcode:1988AJ.....96..635E, doi:10.1086/114834.
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