| Proper Names | Almach, Alamak, Almaac, Almaak | | Bayer Designation | Gamma1,2 Andromedae, Gamma Andromedae A, B, C | | Flamsteed Number | 57 Andromedae A, B, C | | HR (BSC) | 603 (A), 604 (B, C) | | HD | 12523 (A), 12534 (B, C) | | Constellation | Andromeda | | Right Ascension | 2h 3m 54s | | Declination | +42° 19' 47" | | Distance | 355 light years
109 parsecs | | Magnitude | Apparent: +2.2 (A), +4.8 (B)
Absolute: -3.2 (A), -0.6 (B) | | Spectral Class | K3IIb Orange Bright Giant (A), A0V White Main Sequence Star (B), B8V Blue Main Sequence Star (C) | | Optimum Visibility | November | | Notes | Almach 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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