R Scuti
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Scutum |
| Right ascension | 18h 47m 28.95s |
| Declination | −05° 42′ 18.5″ |
| Apparent magnitude (V) | 4.2–8.6 |
| Characteristics | |
| Evolutionary stage | Asymptotic giant branch |
| Spectral type | G0Iae-K2p(M3)Ibe |
| U−B color index | 1.53 |
| B−V color index | 1.47 |
| Variable type | RV Tau |
| Astrometry | |
| Radial velocity (Rv) | 43.80 km/s |
| Proper motion (μ) | RA: −45.399 mas/yr Dec.: −32.410 mas/yr |
| Parallax (π) | 0.8572±0.2549 mas |
| Distance | approx. 4,000 ly (approx. 1,200 pc) |
| Absolute magnitude (MV) | ~ −2 – −3 |
| Details | |
| Mass | 0.55–0.68 M☉ |
| Radius | 160 R☉ |
| Luminosity | 9,400 L☉ |
| Surface gravity (log g) | 0.0 cgs |
| Temperature | 4,500 K |
| Metallicity [Fe/H] | –0.4 dex |
| Other designations | |
| HD 173819, HIP 92202, 2MASS J18472894-0542185, SAO 142620, BD−05°4760, AAVSO 1842-05 | |
| Database references | |
| SIMBAD | data |
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.