Eta Muscae

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Eta Muscae
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Musca
Right ascension 13h 15m 14.94123s [1]
Declination −67° 53′ 40.5276″ [1]
Absolute magnitude (V) −0.81[2]
Distance 405.7[2] ly
(124.4[2] pc)
Spectral type B8V [1]
Other designations
CPD-67 2224, HD 114911, HIP 64661, HR 4993, SAO 252224

Eta Muscae (η Mus) is a star in the constellation Musca. A multiple star system, the two main components form an eclipsing binary that has a spectral type of B8V and an apparent magnitude of 4.77 that dips by 0.05 magnitude every 2.39 days.[3] Further away are stars of magnitude 7.3 and 10—termed Eta Muscae B and C. It is unclear if these stars are gravitationally bound to the main pair.[4]


  1. ^ a b c SIMBAD, Eta Muscae (accessed 21 December 2012)
  2. ^ a b c Hubrig, S.; et al. (June 2001), "Search for low-mass PMS companions around X-ray selected late B stars", Astronomy and Astrophysics, 372: 152–164, arXiv:astro-ph/0103201Freely accessible, Bibcode:2001A&A...372..152H, doi:10.1051/0004-6361:20010452. 
  3. ^ Zasche, P.; Wolf, M.; Hartkopf, W. I.; Svoboda, P.; Uhlař, R.; Liakos, A.; Gazeas, K. (2009). "A catalog of visual double and multiple stars with eclipsing components" (PDF). The Astronomical Journal. 138 (2): 664–79. arXiv:0907.5172Freely accessible. Bibcode:2009AJ....138..664Z. doi:10.1088/0004-6256/138/2/664. 
  4. ^ Butland, R.J.; Budding, E. (2011). "Another component in the multiple system Eta Mus". COMMISSIONS 27 AND 42 OF THE IAU INFORMATION BULLETIN ON VARIABLE STARS (6004).