Epsilon Capricorni

Starbox short
name=ε Capricorni A/B
epoch=J2000.0
constell=Capricornus
ra=21^h37^m04.8^s
dec=−19°27′58″
spectral=B2.5Vpe/K1III-IV
appmag_v=+4.51/+9.5
dist_ly=660 ± 120
dist_pc=203 ± 38
names=Kastra, 39 Capricorni, HR 8260, HD 205637, BD−20°6251/BD−20°6253, FK5 3724, HIP 106723, SAO 164520, GC 30252, BDS 11077, CCDM J21371-1928

Epsilon Capricorni (ε Cap / ε Capricorni) is a triple star system in the constellation Capricornus. It also has the traditional star name Castra or Kastra, meaning "fort" or "military camp" in Latin. It is approximately 660 light years from Earth.

The primary component, ε Capricorni A, is a blue-white B-type main sequence dwarf with a mean apparent magnitude of +4.51. It is classified as a Gamma Cassiopeiae type variable star and its brightness varies from magnitude +4.48 to +4.72. It is a spectroscopic binary, and the two subcomponents have apparent magnitudes of +5.0 and +6.3 and are separated by 0.0047 arcseconds (1 AU).

Further out, 68 arcseconds away, is ε Capricorni B which is at least 13,000 AU, or 0.22 light years away from the close binary. It is an orange K-type giant with an apparent magnitude of +9.5.

References

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* [http://users.winshop.com.au/annew/Castra.html Castra]