R Doradus

R Doradus

Infrared interferometric image of the star
Credit: ESO
Observation data
Epoch J2000      Equinox J2000
Constellation Dorado
Right ascension 04h 36m 45.59127s[1]
Declination −62° 04′ 37.7974″[1]
Apparent magnitude (V) 4.78 – 6.32[2]
Characteristics
Evolutionary stage AGB
Spectral type M8III:e[3]
Apparent magnitude (J) −2.6[4]
Apparent magnitude (K) −4.2[4]
U−B color index +0.86[1]
B−V color index +1.58[1]
Variable type SRb[5]
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]
Distance178 ± 10 ly
(55 ± 3 pc)
Absolute magnitude (MV)1.61 / 1.90
Details
Mass0.7–1.0[7] M☉
Radius298±21[7] R☉
Luminosity4,350±520[7] L☉
Surface gravity (log g)−0.6±0.1[7] cgs
Temperature2,710±70[7] K
Metallicity0.0[7]
Rotation57.5 years[8]
Rotational velocity (v sin i)1±0.1[8] km/s
Age6–14[7] Gyr
Other designations
P Dor, R Dor, AAVSO 0435-62, CCDM J04368-6205A CD−62°175, CPC 20.1 1002, CPD−62°372, GCRV 2726, GSC 08880-01071, HD 29712, HIC 21479, HIP 21479, HR 1492, 2MASS J04364544-6204379, PPM 354226, SAO 249066, WDS J04368-6205A[9]
Database references
SIMBADdata

R Doradus (HD 29712 or P Doradus) is a red giant variable star in the far-southern constellation Dorado, close to the border with Reticulum. 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.

  1. ^ a b c d e f g Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference aavso was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference perkins was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference 2mass was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference GCVS-R-Dor was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference gcsrv was invoked but never defined (see the help page).
  7. ^ a b c d e f g Cite error: The named reference ohnaka2019 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference vlemmings2018 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).