Mu Normae

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
Characteristics
Spectral type	B0Ia
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
Astrometry
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	4,657.13 ly (1,428.57 pc)
Absolute magnitude (MV)	-5.86
Details
Mass	30 M☉
Radius	15.4 R☉
Luminosity	210,000 L☉
Temperature	31,500 K
Age	~4 million years
Other designations
Mu Normae, HD 149038, HR 6155, HIP 81122

Mu Normae is a blue supergiant star in the constellation Norma. Though it has an apparent magnitude of only 4.914, its absolute visual magnitude -5.86 and a bolometric luminosity of 210,000 times that of the Sun. This star is comparable to Epsilon Orionis (Alnilam) in that they are both of class B0 and are supergiants, but this star is less massive at a probable mass of 30 solar masses. Both stars are also suspected of being Alpha Cygni variables 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.

See also

• Alpha Cygni variable
• List of stars in Norma