Mu Normae
 Location of μ Nor (circled) |
|
| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Norma |
| Right ascension | 16h 34m 05.02028s |
| Declination | −44° 02′ 43.1281″ |
| Apparent magnitude (V) | 4.91 |
| Characteristics | |
| Spectral type | O9.7Iab |
| Apparent magnitude (U) | 4.05 |
| Apparent magnitude (B) | 4.99 |
| Apparent magnitude (J) | 4.74 |
| Apparent magnitude (H) | 4.679 |
| Apparent magnitude (K) | 4.612 |
| U−B color index | −0.84 |
| B−V color index | +0.05 |
| Variable type | Suspected α Cygni |
| Astrometry | |
| Radial velocity (Rv) | +6.30 km/s |
| Proper motion (μ) |
RA: 0.02 mas/yr Dec.: −1.98 mas/yr |
| Parallax (π) | 0.78 ± 0.33mas |
| Distance | 1,000pc |
| Absolute magnitude (MV) | -6.45 |
| Details | |
| Mass | 40 M☉ |
| Radius | 25 R☉ |
| Luminosity (bolometric) | 339,000 L☉ |
| Surface gravity (log g) | 3.10 cgs |
| Temperature | 28,500 K |
| Rotational velocity (v sin i) | 61 km/s |
| Age | 4.7 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Mu Normae is a blue supergiant star of spectral type O9.7 Iab in the constellation Norma.
It is 330,000 times the luminosity of the sun and 40 times its mass. It is suspected of being an Alpha Cygni variable, which are named after the similar star Deneb. Being a blue supergiant, it is likely to become a red supergiant in a few million years and eventually a type-II supernova.
It is in the same direction and at the same distance as the faint open cluster NGC 6169, although it is brighter than the combined magnitude of all the other stars in the cluster. It was considered the prototype of the μ Normae class of open clusters by Collinder.
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