What kind of star is Almach?
Almach, catalogued as Gamma Andromedae A (γ And A), appears in the official constellation Andromeda. Its apparent visual magnitude is about 2.10 combined, while its estimated distance is about 350 light-years. Astronomers classify the object as K3 IIb giant plus hot multiple companion system. These labels describe temperature, luminosity class or system components; they should not be read as a claim that every naked-eye point is a single isolated star.
The orange primary, Gamma Andromedae A, is an evolved bright giant. The blue visual companion, Gamma Andromedae B, is not one star: it contains a close pair, and another component makes the wider system at least quadruple. The strong eyepiece colours arise from genuine temperature differences, although human colour contrast can exaggerate their saturation. Orbital periods span from years in the close subsystem to thousands of years for the wide visual pair. Almach therefore gives amateur observers a direct view of one hierarchical level while spectroscopy and high-resolution techniques reveal the others.
The coordinate pair RA 02h 03m 53.95s, Dec +42° 19′ 47.0″ fixes the object's direction on the celestial sphere for the J2000 reference epoch. Right ascension works like celestial longitude measured in hours, while declination works like latitude north or south of the celestial equator. Proper motion and improved measurements can refine catalogue positions, but these coordinates are sufficiently precise for a finder chart or planetarium search.
Almach data at a glance
| Proper name | Almach | Catalogue designation | Gamma Andromedae A (γ And A) |
|---|---|---|---|
| Constellation | Andromeda | Apparent magnitude | about 2.10 combined |
| Spectral or system type | K3 IIb giant plus hot multiple companion system | Estimated distance | about 350 light-years |
| Right ascension (J2000) | 02h 03m 53.95s | Declination (J2000) | +42° 19′ 47.0″ |
Values are rounded for an observer-friendly overview. Consult the linked SIMBAD record for component-level identifiers, bibliography, measurement provenance and newer catalogue values.
The name Almach
Almach derives from Arabic ʿanāq al-arḍ, referring to a caracal or desert lynx. Spellings such as Almaak occur historically; the IAU standardized Almach.
The traditional name’s animal reference does not derive from the Greek Andromeda story, another example of layered sky cultures. Bayer designated the object Gamma Andromedae. William Herschel included it among the striking coloured double stars he studied, and later observers mapped the hierarchy inside the blue companion. In 2016, the IAU Working Group standardized Almach specifically for component A; Almaak remains a recognizable historical spelling.
Modern professional catalogues retain identifiers such as the Bayer designation alongside a proper name. The International Astronomical Union standardizes which name belongs to which component—an important distinction for systems whose combined light looks like one star from Earth.
How to find Almach
Trace Andromeda’s chain northeast through Mirach to its bright endpoint, Almach. A small telescope at about 75× splits a golden primary from a blue companion, one of the finest colour-contrast doubles. The blue component is itself a close multiple beyond ordinary visual resolution.
Best on northern autumn evenings and circumpolar from high northern latitudes. Visibility on a particular night still depends on latitude, season, time, horizon obstructions, weather and local light pollution. Use the interactive atlas below to check the surrounding field before observing.
Observation checklist
- Follow Andromeda’s main chain northeast from Mirach to reach Almach.
- Use 60–120× in a small telescope to separate the wide orange-and-blue pair.
- Slightly defocus if the colours seem washed out by brightness.
- Do not expect to split the blue component’s inner stars with ordinary backyard optics.
Interesting facts about Almach
- Almach is among the sky’s best-known colour-contrast double stars.
- The orange primary is an evolved K-type bright giant.
- The blue visual companion is itself a multiple system.
- The complete hierarchy contains at least four stars.
- The IAU proper name applies specifically to Gamma Andromedae A.
Continue from Almach into the night sky
Use the Andromeda constellation guide to place this star within its larger pattern. When you are ready to observe, compare dark-sky places, find a nearby observatory, or follow our practical guide to finding a star in the night sky. Symbolically registered names are kept separately in the searchable Star-Register catalogue.
Sources and further reading
Measurements are rounded for readability. Multiple systems, variable stars and distant supergiants can have component-specific or model-dependent values. Survey panels show photographic sky fields, not the physical surface of the star.