η Serpentis

Eta Serpentis is an orange giant, six times the radius of the Sun; it's the brightest star in Serpens Cauda (the eastern portion) and is half-way up the 'tail' of the serpent.

Start from the triangle of stars at the southern tip of Serpens Cauda: binoculars.

Now with the naked eye, follow the northeast line from omicron up to nu Ser and about twice more this distance to eta.

At one time it was thought eta had a companion B (catalogued Struve II 8), however it now appears this is just a passing star in the line of sight.

Theta Ser is two fields to the northeast, a delicate pair of white stars (although some report two light blues):
      AB: 4.6, 4.9; 104, 22.3".

Click on theta on the map for more details.

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1999-2014 by Richard Dibon-Smith.