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R Scuti

R Scuti
Location of R Scuti (circled)
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]
Distanceapprox. 4,000 ly
(approx. 1,200 pc)
Absolute magnitude (MV)~ −2 – −3[8]
Details
Mass0.55–0.68[9] M☉
Radius160[10][a] R☉
Luminosity9,400[10] L☉
Surface gravity (log g)0.0[10] cgs
Temperature4,500[10] K
Metallicity [Fe/H]–0.4[10] dex
Other designations
HD 173819, HIP 92202, 2MASS J18472894-0542185, SAO 142620, BD−05°4760, AAVSO 1842-05
Database references
SIMBADdata

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]

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  5. ^ a b Cite error: The named reference ducati was invoked but never defined (see the help page).
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  10. ^ a b c d e Cite error: The named reference Ruyter2005 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference pigott was invoked but never defined (see the help page).


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