Groombridge 34
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| Observation data Equinox J2000 |
|
|---|---|
| Constellation | 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 (Rv) | +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 (MV) | 10.33/13.30 |
| Visual binary orbit | |
| Companion | Gl 15 B |
| Period (P) | 2600 a |
| Semimajor axis (a) | 41.15" |
| Eccentricity (e) | 0.00 |
| Inclination (i) | 61.4° |
| Node (Ω) | 45.3° |
| Periastron epoch (T) | 1745 |
| Other designations | |
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.
[edit] See also
[edit] External links
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