η Persei

Eta Persei (Struve 307) is a golden-orange supergiant with a blue companion, suitable for small telescopes; AB: 3.8, 8.5; 295º, 31.4". The other four members are quite faint.

The star is northwest of alpha Persei and is convenient for locating the Double Cluster:
     First hop up to gamma—just northwest of alpha, barely out of the same field of view. Now placing gamma a little east of centre eta comes into view: binoculars.

Gamma Persei is also a binary (h2170), with a faint but wide companion: 2.9, 10.8; 330º, 56.8".

In the same field of view is Struve 331, a white primary and blue companion: 5.1, 6.2; 85º, 11.9".

With eta centred, move one binocular field northwest; the famous Double Cluster is nearly centred.

Click on this object on the map for its details.

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© 1999-2014 by Richard Dibon-Smith.