R Doradus
Star in the constellation Dorado / From Wikipedia, the free encyclopedia
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R Doradus (HD 29712 or P Doradus) is a red giant variable star in the far-southern constellation Dorado. Its distance from Earth is 178 light-years (55 parsecs). Having a uniform disk diameter of 57±5 mas, it is thought to be the extrasolar star with the largest apparent size as viewed from Earth.
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Dorado |
Right ascension | 04h 36m 45.59127s[1] |
Declination | −62° 04′ 37.7974″[1] |
Apparent magnitude (V) | 4.8–6.6[2] 5.40[3] |
Characteristics | |
Evolutionary stage | AGB |
Spectral type | M8III:e[4] |
Apparent magnitude (J) | −2.6[5] |
Apparent magnitude (K) | −4.2[5] |
U−B color index | +0.86[1] |
B−V color index | +1.58[1] |
Variable type | SRb[2] |
Astrometry | |
Radial velocity (Rv) | +26.1[6] km/s |
Proper motion (μ) | RA: −69.36[1] mas/yr Dec.: −75.78[1] mas/yr |
Parallax (π) | 18.31 ± 0.99 mas[1] |
Distance | 178 ± 10 ly (55 ± 3 pc) |
Details | |
Mass | 0.7–1.0[7] M☉ |
Radius | 298±21[7] R☉ |
Luminosity | 4,350±520[7] L☉ |
Surface gravity (log g) | −0.6±0.1[7] cgs |
Temperature | 2,710±70[7] K |
Metallicity | 0.0[7] |
Rotation | 57.5 years[8] |
Rotational velocity (v sin i) | 1±0.1[8] km/s |
Age | 6–14[7] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
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