Groombridge 34

Groombridge 34

Photo: ESO Online Digitized Sky Survey.

Groombridge 34 is a nearby binary star system consisting of two red dwarfs in a nearly circular orbit with a separation of about 147 astronomical units and an orbital period of 2,600 years. Both components are flare stars and have been given variable star names: the brighter member (Groombridge 34 A) is designated GX Andromedae and the other member is designated GQ And.


Groombridge 34 lies 11.6 light-years away in the constellation Andromeda. It was first listed by Stephen Groombridge (1755–1834) in "A Catalog of Circumpolar Stars" (commonly referred to as the Groombridge Catalogue), published posthumously in 1838.


visual magnitude 8.08 (A), 11.06 (B)
absolute magnitude 10.32 (A), 13.30 (B)
spectral type M1.5V (A), M3.5V (B)
distance 11.62 light-years (3.56 pc)
radial velocity +12.0 km/s
position RA 00h 18m 22.9/25.2s,
Dec +44° 01' 22/26"
other designations GX/GQ Andromedae, HD 1326,
GCTP 49, BD +43°44, LHS 3/4,
GJ 15 A/B, Gl 171-047/171-048,
SAO 36248, HIP 1475