Eta Cygni

η Cygni^[1]

Photo of Eta Cygni by MICROSOFT world wide telescope
Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Cygnus
Right ascension	19^h 56^m 18.3719^s[1]
Declination	+35° 05′ 00.325″[1]
Apparent magnitude (V)	3.909[1]
Characteristics
Spectral type	K0III[1]
U−B color index	+0.89[2]
B−V color index	+1.03[2]
Astrometry
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]

References

1. "Simbad Query Result: eta Cyg -- Star in double system". Centre de Données astronomiques de Strasbourg. Retrieved 2008-04-29.
2. 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.