Groombridge 34

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**Groombridge 34 A/B**
Observation data Epoch J2000
Constellation (pronunciation)	Andromeda
Right ascension	00h 18m 22.9/25.2s
Declination	+44° 01' 22/26"
Apparent magnitude (V)	8.09/11.06
Characteristics
Spectral type	M1.5V/M3.5V
U-B color index	1.24/1.40
B-V color index	1.56/1.81
Variable type	Flare stars
Astrometry
Radial velocity (R_v)	+12.0 km/s
Proper motion (μ)	RA: 2888.92 mas/yr Dec.: 410.58 mas/yr
Parallax (π)	280.59 ± 0.95 mas
Distance	11.62 ± 0.04 ly (3.56 ± 0.01 pc)
Absolute magnitude (M_V)	10.33/13.30
Visual binary orbit
Companion	Gl 15 B
Period (P)	2600 yr
Semimajor axis (a)	41.15"
Eccentricity (e)	0.00
Inclination (i)	61.4°
Longitude of the node (Ω)	45.3°
Periastron epoch (T)	1745
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, LTT 10108/10109, LFT 31/32, Vys 085 A/B HIP 1475.
Database references
SIMBAD	data

Groombridge 34 is a binary star system that consists of two red dwarf stars in a nearly circular orbit with a separation of about 147 astronomical units. Both stars in this pair exhibit variability due to random flares, and they have been given variable star designations. (The brighter member Groombridge 34 A is designated GX And, and the other member is designated GQ And).

[edit] References

Lippincott, S. L., "Parallax and orbital motion of the 2 nearby long-period visual binaries Groombridge 34 and ADS 9090", 1972, Astronomical Journal, 77, 165.