Zeta2 Muscae

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Zeta2 Muscae
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Musca
Right ascension 12h 22m 07.34002s[1]
Declination −67° 31′ 19.5871″[1]
Apparent magnitude (V) 5.14[2] + 8.71[3] + 10.7[4]
Spectral type A5 V[5] + G8-K0V[3]
U−B color index +0.13[2]
B−V color index +0.19[2]
Radial velocity (Rv) −17.0[6] km/s
Proper motion (μ) RA: −30.50[1] mas/yr
Dec.: -6.10[1] mas/yr
Parallax (π) 9.89 ± 0.34[1] mas
Distance 330 ± 10 ly
(101 ± 3 pc)
Luminosity 66.7[7] L
Temperature 7,400[7] K
Other designations
CPD−66°1747, FK5 2990, HIP 60320, HR 4703, SAO 251866.[8]

Zeta2 Muscae is a star[9] in the southern constellation of Musca. Its apparent magnitude is 5.16. This is a white main sequence star of spectral type A5V around 330 light-years distant from Earth.[8] Like several other stars in the constellation, it is a member of the Lower Centaurus Crux subgroup of the Scorpius–Centaurus Association, a group of predominantly hot blue-white stars that share a common origin and proper motion across the galaxy.[10] It is part of a triple star system with faint companions at 0.5 and 32.4 arc seconds distance.[11] The former is an infrared source,[12] the latter has a visual magnitude of 10.7.[4]


  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 Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV data. SIMBAD. Bibcode:1986EgUBV........0M. 
  3. ^ a b Schröder, C.; Schmitt, J. H. M. M. (November 2007). "X-ray emission from A-type stars". Astronomy and Astrophysics. 475 (2): 677–684. Bibcode:2007A&A...475..677S. doi:10.1051/0004-6361:20077429. 
  4. ^ a b "CPD-66 1747B – Star in Double System". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 25 December 2013. 
  5. ^ 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. 
  6. ^ Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. 
  7. ^ a b McDonald, I.; et al. (2012). "Fundamental Parameters and Infrared Excesses of Hipparcos Stars". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–57. arXiv:1208.2037Freely accessible. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x. 
  8. ^ a b "HR 4703 – Star in Double System". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 25 December 2013. 
  9. ^ 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. 
  10. ^ de Zeeuw, P.T.; Hoogerwerf, R.; de Bruijne, J.H.J.; Brown, A.G.A.; et al. (1999). "A Hipparcos Census of Nearby OB Associations". Astronomical Journal. 117 (1): 354–399. arXiv:astro-ph/9809227Freely accessible. Bibcode:1999AJ....117..354D. doi:10.1086/300682. 
  11. ^ Chen, Christine H.; Pecaut, Mark; Mamajek, Eric E.; Su, Kate Y. L.; et al. (2012). "A Spitzer MIPS Study of 2.5-2.0 M☉ Stars in Scorpius-Centaurus". The Astrophysical Journal. 756 (2): 133–57. arXiv:1207.3415Freely accessible. Bibcode:2012ApJ...756..133C. doi:10.1088/0004-637x/756/2/133. 
  12. ^ "IRAS 12193-6714 – Star". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 25 December 2013.