Mu Normae

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Mu Normae
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Norma
Right ascension 16h 34m 05.0207s
Declination −44° 02′ 43.133″
Apparent magnitude (V) 4.914
Spectral type O9.7Iab[1]
Apparent magnitude (U) 4.14
Apparent magnitude (B) 4.951
Apparent magnitude (J) 4.912
Apparent magnitude (H) 4.679
Apparent magnitude (K) 4.612
U−B color index -0.811
B−V color index +0.0369
Variable type Suspected Alpha Cygni
Radial velocity (Rv) +8.6 km/s
Proper motion (μ) RA: 0.52 mas/yr
Dec.: -2.53 mas/yr
Parallax (π) 0.70 ± 0.73 mas
Distance 1,000[2] pc
Absolute magnitude (MV) -6.45[1]
Mass 30 M
Radius 25[1] R
Luminosity 210,000 L
Luminosity (visual, LV) 339,000[1] L
Surface gravity (log g) 2.91[1] cgs
Temperature 28,000[1] K
Rotational velocity (v sin i) 57[1] km/s
Age ~4 million years
Other designations
Database references

Mu Normae is a blue supergiant star of spectral type O9.71ab in the constellation Norma.[3]It is suspected of being an Alpha Cygni variable, which are named after the also similar star Deneb. Being a blue supergiant, it is destined to become a red supergiant in a few million years and eventually a type-II supernova.


  1. ^ a b c d e f g Lefever, K.; Puls, J.; Aerts, C. (2007). "Statistical properties of a sample of periodically variable B-type supergiants". Astronomy and Astrophysics 463 (3): 1093. doi:10.1051/0004-6361:20066038.  edit
  2. ^ Fullerton, A. W.; Massa, D. L.; Prinja, R. K. (2006). "The Discordance of Mass‐Loss Estimates for Galactic O‐Type Stars". The Astrophysical Journal 637 (2): 1025. doi:10.1086/498560.  edit
  3. ^ Sota, A.; Maíz Apellániz, J.; Morrell, N.I.; Barbá, R.H.; Walborn, N.R.; Gamen, R.C.; Arias, J.I.; Alfaro, E.J. (2014). "The Galactic O-Star Spectroscopic Survey (GOSSS). II. Bright Southern Stars". The Astrophysical Journal Supplement 211 (1): 84. Bibcode:2014ApJS..211...10S. doi:10.1088/0067-0049/211/1/10. 10.