Sigma Persei

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Sigma Persei
Perseus constellation map.svg
Cercle rouge 100%.svg

Location of σ Persei (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Perseus
Right ascension 03h 30m 34.48s
Declination +47° 59' 42.6"
Apparent magnitude (V) +4.36
Distance 353 ly
(108 pc)
Spectral type K3III
Other designations
σ Persei, σ Per, Sigma Per, 35 Persei, BD+47 843, FK5 124, GC 4158, HD 21552, HIP 16335, HR 1052, PPM 46257, SAO 38890.

Sigma Persei (Sigma Per, σ Persei, σ Per) is an orange K-type giant with an apparent magnitude of +4.36. It is approximately 353 light years from Earth.

Sigma Persei is moving through the Galaxy at a speed of 17.4 km/s relative to the Sun. Its projected Galactic orbit carries it between 24,400 and 43,600 light years from the center of the Galaxy. It came closest to the Sun 5.1 million years ago when it had brightened to magnitude 3.11 from a distance of 202 light years.[1]

Name and etymology[edit]

This star, together with δ Per, ψ Per, α Per, γ Per and η Per, has been called the Segment of Perseus.[2]


  1. ^ Sigma Persei (HIP 16335)
  2. ^ Allen, R. H. (1963). Star Names: Their Lore and Meaning (Reprint ed.). New York: Dover Publications Inc. p. 331. ISBN 0-486-21079-0. Retrieved 2012-09-04.