R Scuti
Variable star in the constellation Scutum / From Wikipedia, the free encyclopedia
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R Scuti (R Sct) is a star in the constellation of Scutum. It is a yellow supergiant and is a pulsating variable known as an RV Tauri variable. It was discovered in 1795 by Edward Pigott at a time when only a few variable stars were known to exist.[11]
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Scutum |
Right ascension | 18h 47m 28.95s[1] |
Declination | −05° 42′ 18.5″[1] |
Apparent magnitude (V) | 4.2–8.6[2] |
Characteristics | |
Evolutionary stage | Asymptotic giant branch[3] |
Spectral type | G0Iae-K2p(M3)Ibe[4] |
U−B color index | 1.53[5] |
B−V color index | 1.47[5] |
Variable type | RV Tau[2] |
Astrometry | |
Radial velocity (Rv) | 43.80[6] km/s |
Proper motion (μ) | RA: −45.399[7] mas/yr Dec.: −32.410[7] mas/yr |
Parallax (π) | 0.8572 ± 0.2549 mas[7] |
Distance | approx. 4,000 ly (approx. 1,200 pc) |
Absolute magnitude (MV) | ~ −2 – −3[8] |
Details | |
Mass | 0.55–0.68[9] M☉ |
Radius | 84[3] R☉ |
Luminosity | 5,000[3] - 9,400[10] L☉ |
Surface gravity (log g) | 0.0[10] cgs |
Temperature | 4,000[3] - 4,500[10] K |
Metallicity [Fe/H] | –0.4[10] dex |
Other designations | |
Database references | |
SIMBAD | data |
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