S Cassiopeiae
S Cassiopeiae in 2MASS Credit: SIMBAD Astronomical Database | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cassiopeia |
| Right ascension | 01h 19m 41.980s |
| Declination | 72° 36′ 40.85″ |
| Apparent magnitude (V) | +7.9 – +16.1 |
| Characteristics | |
| Evolutionary stage | AGB |
| Spectral type | S3,4 – S5,8 |
| Variable type | Mira |
| Astrometry | |
| Proper motion (μ) | RA: 1.980 mas/yr Dec.: 1.515 mas/yr |
| Parallax (π) | 1.0515±0.0907 mas |
| Distance | 3,100 ± 300 ly (950 ± 80 pc) |
| Details | |
| Mass | 4.1 M☉ |
| Radius | 930 R☉ |
| Luminosity | 5,210 L☉ |
| Surface gravity (log g) | 1.32 cgs |
| Temperature | 1,800 K |
| Metallicity [Fe/H] | −0.51 dex |
| Other designations | |
| S Cas, HD 7769, BD+71°66, 2MASS J01194198+7236407, GSC 04305-01322, IRAS 01159+7220, IRC+70024, AAVSO 0112+72 | |
| Database references | |
| SIMBAD | data |
S Cassiopeiae (S Cas, HD 7769) is a Mira variable and S-type star in the constellation Cassiopeia. It is an unusually cool star, rapidly losing mass and surrounded by dense gas and dust producing masers.