· · · ·

Eta Cygni

21 Cygni

Proper NameNone
Bayer DesignationEta Cygni
Flamsteed Number21 Cygni
HR (BSC)7615
Right Ascension19h 56m 18s
Declination+35° 5' 0"
Distance135 light years
41 parsecs
MagnitudeApparent: +3.9
Absolute: +0.8
Spectral ClassK0III orange giant
Optimum VisibilityJuly / August
NotesEta Cygni is positioned approximately halfway between the brighter stars Sadr and Albireo in the prominent northern constellation of Cygnus the Swan. The primary star is an ancient orange giant, with a red dwarf companion making this a binary system. Three other stars lie close by in the sky, but these are optical companions and not physically associated with Eta Cygni itself.


Related Entries