Eta Capricorni

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η Capricorni
Observation data
Equinox J2000.0
Constellation Capricornus
Right ascension 21h04m24.3s
Declination −19°51′18″
Apparent magnitude (V) +4.82
Distance 158 ± 11 ly
(48 ± 3 pc)
Spectral type A5V
Other designations
Arm, 22 Capricorni, HR 8060, HD 200499, Gl 816.2, BD−20°6115, HIP 104019, SAO 189986, GC 29419, CCDM J21044-1951

Eta Capricorni (η Cap / η Capricorni) is a binary star in the constellation Capricornus. It also has the traditional star name Arm. It is approximately 158 light years from Earth.

The primary component, η Capricorni A, is a white A-type main sequence dwarf with an apparent magnitude of +4.82. Its companion, η Capricorni B, has an apparent magnitude of +6.5 and is located 0.34 arcseconds from the primary.


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