Groombridge 34

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Groombridge 34 or ADS 246 A or Gliese 15 00h18m22.89s, +44°01'22.6"
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension 00h 18m 22.89s[1]
Declination +44° 01′ 22.6″[1]
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[1] mas/yr
Dec.: +410.10 ± 0.48[1] mas/yr
Parallax (π) 278.76 ± 0.77[1] 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[2] M
Radius 0.3863 ± 0.0021[3] R
Luminosity 0.0064 L
Surface gravity (log g) 4.89[2] cgs
Temperature 3,730 ± 49[2] K
Metallicity [Fe/H] -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[edit]

In August of 2014, a planet orbiting around Groombridge 34 A was reported. [4]

The Groombridge 34 A planetary system
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[edit]

References[edit]

  1. ^ a b c d e 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
  2. ^ a b c 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. 
  3. ^ http://arxiv.org/abs/1408.5645
  4. ^ 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[edit]

Components[edit]

NAME Right ascension Declination Apparent magnitude (V) Spectral type Database references
ADS 246 B (ADS 246 AB) 00h 18m 24s +44° 01' 00 11.0 Simbad
ADS 246 C (V* GQ And) 00h 18m 25.868s +44° 01' 38.44 11.4 M3.5 Simbad
ADS 246 D (GJ 15 C) 00h 18m 00.13s +44° 00' 29.2 11.4 M5 Simbad