Gam-1

Variable star

Its story

Gamma-1 Sagittarii is an exceptional star: a pulsating yellow supergiant of the classical Cepheid class, also catalogued as W Sagittarii, whose brightness varies with a strict rhythm that turns it into a cosmic calibration beacon. At 870 light-years it forms a triple system with two warmer companions. Cepheids like this are the clocks that let Hubble measure the scale of the universe in the 1920s.

Constellation: Sagittarius
Apparent magnitude: 4.66
Distance: 869.9 light years
Coordinates (J2000): RA 271.255° · Dec -29.580°
Catalogue: HIP 88567 · HD 164975

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