S Normae
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Norma |
| Right ascension | 16h 18m 51.8325s |
| Declination | −57° 53′ 59.244″ |
| Apparent magnitude (V) | 6.394 (6.12 - 6.77) |
| Characteristics | |
| Spectral type | F8-G0Ib + B9.5V |
| U−B color index | +0.66 |
| B−V color index | +1.00 |
| Variable type | δ Cepheid |
| Astrometry | |
| Radial velocity (Rv) | 5.83 km/s |
| Proper motion (μ) | RA: 0.07 mas/yr Dec.: 0.04 mas/yr |
| Parallax (π) | 1.16±0.76 mas |
| Distance | 924 pc |
| Absolute magnitude (MV) | -4.02 |
| Orbit | |
| Period (P) | 8,660 yr |
| Semi-major axis (a) | 794 AU |
| Details | |
| Mass | 6.3 M☉ |
| Radius | 65.6 R☉ |
| Luminosity | 3,630 L☉ |
| Temperature | 6,350 K |
| Metallicity | +0.10 |
| companion | |
| Mass | 2.4 M☉ |
| Age | 80 Myr |
| Other designations | |
| S Nor, HR 6062, SAO 243586, CD−57°6342, GSC 08719-00158, HD 146323, NGC 6087 132, GC 21898, HIP 79932, NGC 6087 155 | |
| Database references | |
| SIMBAD | data |
S Normae (S Nor) is a yellow supergiant variable star in the constellation Norma. It is the brightest member of the open cluster NGC 6087.
S Normae is a Classical Cepheid variable with a visual magnitude range of 6.12 to 6.77 and a period of 9.75411 days. The spectral type varies during the pulsation cycle from F8 to G0. Its mass has been measured at 6.3 M☉ with reference to a close orbital companion, and it is over 3,000 times as luminous as the sun.