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Almach

Alamak, Almaac, Almaak, Gamma1,2 Andromedae, 57 Andromedae

Proper NamesAlmach, Alamak, Almaac, Almaak
Bayer DesignationGamma1,2 Andromedae, Gamma Andromedae A, B, C
Flamsteed Number57 Andromedae A, B, C
BSC603 (A), 604 (B, C)
HD12523 (A), 12534 (B, C)
ConstellationAndromeda
Right Ascension2h 5m 7s
Declination+42° 25' 26"
Distance355 light years
109 parsecs
MagnitudeApparent: +2.2 (A), +4.8 (B)
Absolute: -3.2 (A), -0.6 (B)
Spectral ClassK3IIb Orange Bright Giant (A), A0V White Main Sequence Star (B), B8V Blue Dwarf (C)
Optimum VisibilityNovember
NotesAlmach is a complex multiple system. Almach A is an orange giant, which rotates around a common centre of gravity with a triple system consisting of the Almach B (itself a binary system) and a blue star designated Almach C.

In the east of Andromeda, towards the hero Perseus, is one of the sky's most famous multiple systems. Two close bright stars, one blue and one yellow-orange, converged with one another to meet in 2012, and are now separating again. Meanwhile, a third component circles these two along a decades-long orbit.

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