Eta Cygni

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η Cygni[1]

Photo of Eta Cygni by MICROSOFT world wide telescope
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cygnus
Right ascension 19h 56m 18.3719s[1]
Declination +35° 05′ 00.325″[1]
Apparent magnitude (V) 3.909[1]
Spectral type K0III[1]
U−B color index +0.89[2]
B−V color index +1.03[2]
Radial velocity (Rv) −26.5[1] km/s
Proper motion (μ) RA: −34.00[1] mas/yr
Dec.: −27.60[1] mas/yr
Parallax (π) 23.40 ± 0.54[1] mas
Distance 139 ± 3 ly
(42.7 ± 1.0 pc)
Other designations
21 Cygni, HR 7615, BD+34°3798, HD 188947, SAO 69116, FK5 1521, HIP 98110.[1]

Eta Cygni (η Cyg) is a star in the constellation Cygnus. It is located about 137 light years from the Sun and is categorised as an orange giant star of spectral class K0III.[1]


  1. ^ a b c d e f g h i j k "Simbad Query Result: eta Cyg -- Star in double system". Centre de Données astronomiques de Strasbourg. Retrieved 2008-04-29. 
  2. ^ a b Johnson, H. L.; Iriarte, B.; Mitchell, R. I.; Wisniewskj, W. Z. (1999). "UBVRIJKL photometry of the bright stars". Commission Lunar and Planetary Laboratory. 4: 99. Bibcode:1966CoLPL...4...99J.