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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda |
| Right ascension | 00 18 22.89 |
| Declination | +44° 01′ 22.6″ |
| Apparent magnitude (V) | 8.09/11.06 |
| Characteristics | |
| Spectral type | M1.5V + M3.5V |
| U−B color index | 1.24 |
| B−V color index | 1.56 |
| Variable type | Flare stars |
| Astrometry | |
| Radial velocity (Rv) | +12.0 km/s |
| Proper motion (μ) | RA: +2888.92 ± 0.60 mas/yr Dec.: +410.10 ± 0.48 mas/yr |
| Parallax (π) | 278.76 ± 0.77 mas |
| Distance | 11.70 ± 0.03 ly (3.587 ± 0.010 pc) |
| Absolute magnitude (MV) | 10.33/13.29 |
| Orbit | |
| Companion | Groombridge 34 B Gl 15 B |
| Period (P) | 2,600 yr |
| Semi-major axis (a) | 41.15″ |
| Eccentricity (e) | 0.00 |
| Inclination (i) | 61.4° |
| Longitude of the node (Ω) | 45.3° |
| Periastron epoch (T) | 1745 |
| Details | |
| GX And | |
| Mass | 0.404 M☉ |
| Radius | 0.3863 ± 0.0021 R☉ |
| Luminosity | 0.0064 L☉ |
| Surface gravity (log g) | 4.89 cgs |
| Temperature | 3,730 ± 49 K |
| Metallicity | -0.32 dex |
| GQ And | |
| Mass | 0.163 M☉ |
| Radius | 0.19 R☉ |
| Luminosity | 0.00042 L☉ |
| Temperature | ~3,000 K |
| Other designations | |
| GX/GQ Andromedae, BD +43°44, GCTP 49, GJ 15 A/B, Gl 171-047/171-048, HD 1326, HIP 1475, LHS 3/4, LTT 10108/10109, LFT 31/32, SAO 36248, Vys 085 A/B. | |
| Database references | |
| SIMBAD | data |
| Database references | |
| SIMBAD | data |
Groombridge 34 is a binary star system located about 11.7 light-years from the Sun. It consists of two red dwarfs in a nearly circular orbit with a separation of about 147 AU. 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).
Planetary system
In August of 2014, a planet orbiting around Groombridge 34 A was reported.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥ 5.35±0.75 M🜨 | 0.0717±0.0034 | 11.4433±0.0017 | 0.12? | — | — |
See also
References
- ^ van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
- ^ Berger, D. H.; et al. (2006). "First Results from the CHARA Array. IV. The Interferometric Radii of Low-Mass Stars". The Astrophysical Journal. 644 (1): 475–483. arXiv:astro-ph/0602105. Bibcode:2006ApJ...644..475B. doi:10.1086/503318.
{{cite journal}}: Explicit use of et al. in:|author=(help) - http://arxiv.org/abs/1408.5645
- http://arxiv.org/abs/1408.5645
- 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.
External links
- SolStation entry
- www.richweb.f9.co.uk/
- Image Groombridge 34
- The One Hundred Nearest Star Systems, RECONS
Components
| NAME | Right ascension | Declination | Apparent magnitude (V) | Spectral type | Database references |
|---|---|---|---|---|---|
| ADS 246 B (ADS 246 AB) | 00 18 24 | +44° 01' 00 | 11.0 | Simbad | |
| ADS 246 C (V* GQ And) | 00 18 25.868 | +44° 01' 38.44 | 11.4 | M3.5 | Simbad |
| ADS 246 D (GJ 15 C) | 00 18 00.13 | +44° 00' 29.2 | 11.4 | M5 | Simbad |
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- Spectroscopic binaries
- Andromeda (constellation)
- Flare stars
- M-type main-sequence stars
- Binary stars
- Henry Draper Catalogue objects
- Hipparcos objects
- Gliese and GJ objects
- Groombridge objects
- Durchmusterung objects
- Objects named with variable star designations
- Objects within 100 ly of Earth
- Main-sequence-star stubs
- Multiple star stubs
- Variable star stubs