S Scuti
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Scutum |
| Right ascension | 18h 50m 20.03715s |
| Declination | −07° 54′ 27.4270″ |
| Apparent magnitude (V) | 6.80 |
| Characteristics | |
| Spectral type | C64 |
| Variable type | SRb |
| Astrometry | |
| Radial velocity (Rv) | −0.20 ± 1.6 km/s |
| Proper motion (μ) | RA: 7.92 mas/yr Dec.: −4.55 mas/yr |
| Parallax (π) | 2.59±0.57 mas |
| Distance | approx. 1,300 ly (approx. 390 pc) |
| Details | |
| Radius | 288 R☉ |
| Luminosity | 4,300±100 L☉ |
| Temperature | 2,755 K |
| Other designations | |
| BD−08° 4726, HD 174325, HIP 92442, HR 7089, SAO 142674 | |
| Database references | |
| SIMBAD | data |
S Scuti is a carbon star located in the constellation Scutum. Parallax measurements by Hipparcos put it at a distance of approximately 1,300 light-years (390 parsecs). Its apparent magnitude is 6.80, making it not quite bright enough to be seen with the naked eye.
Louisa Dennison Wells discovered that the star is a variable star. Her discovery was announced in 1901. It was listed with its variable star designation, S Scuti, in Annie Jump Cannon's 1907 work Second Catalog of Variable Stars. S Scuti is a semiregular variable star. Its class is SRb, and its pulsation cycle lasts 148 days. S Scuti is also surrounded by a roughly spherical shell of dust. The shell was known earlier from its carbon monoxide emission lines. The total mass of the dust is (7 ± 2)×10−5 M☉.