Gamma Coronae Australis

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γ Coronae Australis
Location of γ Coronae Australis (circled)
Observation data
ICRS
)
Constellation
Corona Australis
Right ascension 19h 06m 25.11014s[1]
Declination −37° 03′ 48.3901″[1]
Apparent magnitude (V) 4.20[2]
Characteristics
Spectral type F8V + F8V[3]
U−B color index +0.51[4]
B−V color index +0.01[4]
Distance
56.4 ± 0.7 ly
(17.3 ± 0.2 pc)
Absolute magnitude (MV)3.73 / 3.80[6]
Argument of periastron
(ω)
(secondary)		349.0°
Details
Gyr
HR 7227[9]
Database references
SIMBADγ CrA
γ CrA A
γ CrA B

Gamma Coronae Australis (γ CrA), is a binary star located in the constellation Corona Australis. The system has a combined apparent visual magnitude of 4.20,[2] making it faintly visible to the naked eye. It is located 56.4 light-years (17.3 parsecs) from the Sun, based on its parallax.[1] Gamma Coronae Australis is a member of the Milky Way's thin disk.[6]

The system is a visual binary, where the orbit is calculated from observations of one star orbiting the other. The primary, Gamma Coronae Australis A, is a late F-type main-sequence star with an effective temperature of 6,090 K.[6] It has an absolute an absolute magnitude of +3.73, and a mass of 1.15 solar masses.[6] The secondary, Gamma Coronae Australis B, is also F-type. With an effective temperature of 6,100 K, an absolute magnitude of +3.80, and a mass of 1.14 solar masses, the companion is almost identical to the primary.[6] Gamma Coronae Australis has been known to be a binary for a long time, and its two components have been given Henry Draper Catalogue designations of HD 177474[8] and HD 177475,[9] respectively. The two stars are separated by 1.896″ and orbit each other every 121.76 years.[7]

References

  1. ^
    S2CID 18759600
    .
  2. ^ a b c "* gam CrA". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 20 June 2017.
  3. doi:10.1093/mnras/sts257
    .
  4. ^
    Bibcode:1986EgUBV........0M
    .
  5. S2CID 119231169
    .
  6. ^
    S2CID 126218052
    .
  7. ^ a b "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Archived from the original on 1 August 2017. Retrieved 20 June 2017.
  8. ^ a b "* gam CrA A". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 20 June 2017.
  9. ^ a b "* gam CrA B". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 20 June 2017.
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