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).[2] Its apparent magnitude is 6.80,[3] making it visible to the naked eye only under excellent conditions.
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Scutum |
Right ascension | 18h 50m 20.03715s[2] |
Declination | −07° 54′ 27.4270″[2] |
Apparent magnitude (V) | 6.80[3] |
Characteristics | |
Spectral type | C64[4] |
Variable type | SRb |
Astrometry | |
Radial velocity (Rv) | −0.20 ± 1.6[5] km/s |
Proper motion (μ) | RA: 7.92[2] mas/yr Dec.: −4.55[2] mas/yr |
Parallax (π) | 2.59 ± 0.57 mas[2] |
Distance | approx. 1,300 ly (approx. 390 pc) |
Details | |
Radius | 386[4] R☉ |
Luminosity | 4634[4] L☉ |
Temperature | 2425[4] K |
Other designations | |
Database references | |
SIMBAD | data |
S Scuti is a semiregular variable star. Its class is SRb, and its pulsation cycle lasts 148 days.[4] It has a radius of 386 R☉.[4] S Scuti is also surrounded by a roughly spherical shell of dust. The shell was known earlier from its carbon monoxide emission lines.[6] The total mass of the dust is (7 ± 2)×10−5 M☉.[6]