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Epsilon Coronae Australis

Epsilon Coronae Australis

A light curve for Epsilon Coronae Australis plotted from TESS data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Corona Australis
Right ascension 18h 58m 43.37714s[2]
Declination −37° 06′ 26.4865″[2]
Apparent magnitude (V) +4.75[3]
Characteristics
Spectral type F4V Fe-0.8[4]
U−B color index +0.01[3]
B−V color index +0.39[3]
Variable type W UMa[5]
Astrometry
Radial velocity (Rv)57.90 ± 1.2[6] km/s
Proper motion (μ) RA: −132.40[2] mas/yr
Dec.: −110.62[2] mas/yr
Parallax (π)33.13 ± 0.33 mas[2]
Distance98.4 ± 1.0 ly
(30.2 ± 0.3 pc)
Absolute magnitude (MV)2.21[7]
Orbit[8]
Period (P)0.59143357 ± 0.00000016 d
Semi-major axis (a)3.795 ± 0.052 R☉
Eccentricity (e)0
Inclination (i)73.05 ± 0.16°
Longitude of the node (Ω)2.0113 ± 0.0033°
Periastron epoch (T)JD 2442296.95907 ± 0.0070
Details
ε CrA A
Mass1.9[8] M☉
Radius2.167[8][note 1] R☉
Temperature6481 ± 20[8] K
Rotational velocity (v sin i)148.5[9] km/s
ε CrA B
Mass0.24[8] M☉
Radius0.869[8][note 1] R☉
Temperature5939 ± 19[8] K
Other designations
ε CrA, CD−37°13001, CPD−37°8433, HD 175813, HIP 93174, HR 7152, SAO 210781[5]
Database references
SIMBADdata

Epsilon Coronae Australis (ε CrA), is a star system located in the constellation Corona Australis. Varying in brightness between apparent magnitudes of 4.74 to 5 over 14 hours, it is the brightest W Ursae Majoris variable (low mass contact binary) in the night sky.

  1. ^ Cite error: The named reference MAST was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference HIP was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference EgUBV was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Gray was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference RV was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference eker 2008 was invoked but never defined (see the help page).
  8. ^ a b c d e f g Cite error: The named reference Wilson was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference CaII was invoked but never defined (see the help page).


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