ο1 and ο2 Cygni and 30 Cygni

30 Cyg and 31 Cyg (omicron1) form a celebrated multiple system of binaries. The omicrons are just over one binocular field west-northwest of alpha Cygni: binoculars.
     31 Cyg (omicron1) has components ABC, with B a faint (13m) component with an orbit of just over 10 years. 30 Cygni is component D.
      31 Cyg (omicron1) is an orange-yellow giant while the others all have a blueish tint.

The binaries go under different labels:
      31 Cyg (h1495AB): 3.9, 13.4; 330, 36.3".
      31 Cyg (Struve App 50AC): 3.9, 7.0; 174, 111.0".
      31-30 Cyg (Struve App 50AD): 3.9, 4.8; 325, 333.8".

32 Cyg is also an orange giant, and is a binary system as well:
      32 Cyg (S 743): 4.2, 8.4; 175, 208"

Finally, and most obviously, omicron1 and omicron2 form a wide naked-eye optical double of two orange stars 61.3' apart (i.e one degree and a bit).


North-northwest one binocular field will bring you to psi Cygni and several other binaries.

Psi is a multiple system; AB is too close for most observers, but AC is accessible with telescopes: 5.0, 7.5; 175, 2.8".

More accessible are the two Flamsteed stars, 16 Cygni and 26 Cygni.
      16 Cygni - a pair of golden stars: 6.0, 6.2; 133, 39.7".
      26 Cygni - a golden primary and bluish companion: 5.5, 8.5; 148, 42".


Continuing in this part of the constellation, move one binocular field northeast with 33 Cygni at the northern edge. There are three fine binaries in this field:
      Otto Struve 404: yellow primary, bluish companion: 7.6, 9.8; 115, 28.5"
      Struve 2658: yellow primary, blue companion: 7.2, 9.4; 105, 6.8" (with two more, fainter, companions)
      Struve 2671, two white stars: 6.0, 7.5; 336, 3.7".

Now move back to psi Cygni (one field southwest). Then sweep your glasses west a little over a binocular field, to reveal iota and kappa Cygni. A nice yellow pair, Struve 2486, is found in a gorgeous field of stars:
      6.5, 6.7; 204, 7.3".

In the same field of view is a fine binocular double, Otto Struve (Appendix) 182:
      AB: 7.5, 8.6; 297, 73.2".


We now move about two binocular fields southeast to delta Cygni. In the same field is the open cluster NGC 6811. Click on delta on the map for its details.

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1999-2014 by Richard Dibon-Smith.