RY Sagittarii

RY Sagittarii
Location of RY Sagittarii (circled)
Observation data
Epoch J2000.0 ICRS      Equinox J2000.0 ICRS
Constellation Sagittarius
Right ascension 19h 16m 32.76686s[1]
Declination −33° 31′ 20.3402″[1]
Apparent magnitude (V) 5.8-14.0[2]
Characteristics
Spectral type G0Iaep (C1,0)[2]
Variable type R CrB[2]
Astrometry
Radial velocity (Rv)−16.02[1] km/s
Proper motion (μ) RA: 8.957[1] mas/yr
Dec.: −0.277[1] mas/yr
Parallax (π)0.5880 ± 0.0273 mas[1]
Distance5,500 ± 300 ly
(1,700 ± 80 pc)
Absolute magnitude (MV)−5[3]
Details
Radius60[3] R☉
Luminosity9,120[3] L☉
Temperature7,250[4] K
Other designations
RY Sgr, CD−33 14076, HD 180093, HIP 94730, HR 7296, SAO 211117
Database references
SIMBADdata

RY Sagittarii is a yellow supergiant and an R Coronae Borealis type variable star in the constellation Sagittarius. Although it ostensibly has the spectrum of a G-type star, it differs markedly from most in that it has almost no hydrogen and much carbon.

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