ε Persei

Epsilon Persei is a blue-white giant (although it has also been classified as a dwarf) with about seven times the Sun's radius and an extremely hot surface at 27,600 Kelvins. Although quite young at around 10 million years old, in just another few million years it will explode as a supernova.

The star is about ten degrees (i.e. two binocular fields) east of beta Persei, easily seen with the naked eye in the company of nu Persei: binoculars.

Epsilon Persei is a double (Struve 471) with two white stars: 2.9, 8.9; 10, 8.7".

In the same field of view, near the southwestern edge, is the lovely binocular double Struve 434; AB (orange and blue): 7.8, 8.3; 83, 33.4".


A little over one binocular field south is zeta Persei. In this field are xi to the north and omicron to the extreme southwest.

Just north of xi Persei is the elusive California Nebula, an emission nebula bright enough (perhaps) to be seen in binoculars. A small telescope may bring out more details, but this remains one of the most difficult deep sky objects to study.

With zeta on the southern edge omicron is in the same field; both are telescopic binaries:
      zeta (Struve 464)AB (pale white and grayish white): 2.9, 9.2; 209, 12.9".
      omicron (BU 535): 3.9, 6.7; 23, 1.0".

East a little over one binocular field is a small grouping of stars, including 56 Persei. Including this star there are two binaries in this field:
      56 Persei (Otto Struve 81)AB, two yellow stars: 5.8, 9.3; 16, 4.3".
      Struve 533AB, a yellow primary and blue companion: 7.3, 8.5; 62, 19.6".

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1999-2014 by Richard Dibon-Smith.