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	'''Groombridge 34''' is a binary star system located about 11.7 light-years from the ]. It consists of two ]s in a nearly circular orbit with a separation of about 147 ]. 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'').		'''Groombridge 34''' is a binary star system located about 11.7 light-years from the ]. It consists of two ]s in a nearly circular orbit with a separation of about 147 ]. 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. <ref>http://arxiv.org/abs/1408.5645</ref>

			{{OrbitboxPlanet begin \|name=Groombridge 34 A
			\| table_ref =
			}}
			{{OrbitboxPlanet
			\| exoplanet = ]
			\| mass_earth = ≥ 5.35±0.75
			\| period = 11.4433±0.0017
			\| semimajor = 0.0717±0.0034
			\| eccentricity = 0.12?
			}}
			{{Orbitbox end}}



	==See also==		==See also==

Revision as of 03:12, 26 August 2014

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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	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 (R_v)	+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 (M_V)	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	0.379 ± 0.006 `R`_☉
Luminosity	0.0064 `L`_☉
Surface gravity (log g)	4.89 cgs
Temperature	3,730 ± 49 K
Metallicity	–0.46 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.

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?	—	—

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

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

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

← Celestial objects within 15–20 light-years

Primary member type

Celestial objects by systems.

Subgiant stars

G-type	Delta Pavonis (19.893±0.015 ly)

Main-sequence
stars

A-type	Altair (Alpha Aquilae) (16.730±0.049 ly)
G-type	Alsafi (Sigma Draconis) (18.7993±0.0081 ly) Achird (Eta Cassiopeiae) (19.3314±0.0025 ly) K-type main-sequence star B e (82 G.) Eridani (19.7045±0.0093 ly) 3 (6?) planets: b, c?, d (c), e?, f?, g?, d
K-type	Groombridge 1618 (15.8857±0.0017 ly) Omicron (40) Eridani (16.3330±0.0042 ly) white dwarf B red dwarf C 70 Ophiuchi (16.7074±0.0087 ly) K-type main-sequence star B Gliese 570 (19.1987±0.0074 ly) 2 red dwarfs: B, C T-type brown dwarf D 36 Ophiuchi (19.4185±0.0036 ly) 2 K-type main-sequence stars: B, C HR 7703 (19.609±0.013 ly) red dwarf B
M-type (red dwarfs)	GJ 1245 (15.2001±0.0034 ly) 2 red dwarfs: B, C Gliese 876 (15.2382±0.0025 ly) 4 planets: d, c, b, e LHS 288 (15.7586±0.0034 ly) GJ 1002 (15.8060±0.0036 ly) 2 planets: b, c Gliese 412 (15.9969±0.0026 ly) red dwarf B AD Leonis (16.1939±0.0024 ly) Gliese 832 (16.2005±0.0019 ly) planet b Gliese 682 (16.3328±0.0026 ly) 2? planets: b?, c? EV Lacertae (16.4761±0.0018 ly) G 9-38 (16.800±0.011 ly) red dwarf B GJ 3379 (16.9861±0.0027 ly) Gliese 445 (17.1368±0.0017 ly) 2M1540 (17.3738±0.0046 ly) GJ 3323 (17.5309±0.0026 ly) 2 planets: b, c Gliese 526 (17.7263±0.0024 ly) Stein 2051 (17.9925±0.0020 ly) white dwarf B Gliese 251 (18.2146±0.0028 ly) planet b LP 816-60 (18.3305±0.0038 ly) LSR J1835+3259 (18.5534±0.0049 ly) Gliese 205 (18.6042±0.0022 ly) Gliese 229 (18.7906±0.0018 ly) T-type brown dwarf B 2 planets: Ab, Ac Ross 47 (18.8883±0.0031 ly) Gliese 693 (19.2078±0.0053 ly) Gliese 754 (19.2724±0.0067 ly) Gliese 908 (19.2745±0.0032 ly) Gliese 752 (19.2922±0.0027 ly) red dwarf B (vB 10) planet Ab Gliese 588 (19.2996±0.0031 ly) 2? planets: b?, c? YZ Canis Minoris (19.5330±0.0040 ly) GJ 1005 (19.577±0.035 ly) red dwarf B Gliese 268 (19.7414±0.0076 ly) red dwarf B

Degenerate
stars

White dwarfs	Gliese 440 (15.1226±0.0013 ly)

Brown dwarfs

L-type	DENIS 0255−4700 (15.877±0.014 ly)
T-type	WISE 1741+2553 (15.22±0.20 ly) WISE 1506+7027 (16.856±0.052 ly) DENIS 0817-6155 (17.002±0.037 ly) 2MASS 0939-2448 (17.41±0.44 ly) T-type brown dwarf B 2MASS 1114-2618 (18.20±0.14 ly) 2MASS 0415-0935 (18.62±0.18 ly) SIMP0136 (19.955±0.057 ly) 2MASS 0937+2931 (19.96 _−0.21 ly)
Y-type	WISE 1639−6847 (15.450±0.041 ly) WISE 0350−5658 (18.49±0.24 ly)

Sub-brown dwarfs
and rogue planets

Y-type	WISE 1541−2250 (19.54±0.24 ly)

Constellation of Andromeda

Stars

Bayer	α (Alpheratz) β (Mirach) γ (Almach) δ ε ζ η θ ι κ λ μ ν ξ (Adhil) ο π ρ σ τ υ (Titawin) φ χ ψ ω A b c υ Per (Nembus)
Flamsteed	2 3 4 5 6 7 8 9 10 11 12 13 14 (Veritate) 15 18 22 23 26 28 32 36 39 41 44 45 47 55 56 58 59 63 64 65 66 6 Per
Variable	R T U W Z RT RV RX SU SW TU TW WZ XZ AB AC AD AE AF AR BM BX CC CG CN DS DX EG ET EU FF GO GP GQ GX GR GY HH HN IW KK KX KZ LL LN LP LQ OP OS OU PX PY QR QV QX V385 V428 V439 V455 V529 V807
HR	1 40 56 78 104 122 134 178 275 282 283 289 379 410 483 687 746 748 8884 8925 8950 8962 8973 9011 9074 9075 9105
HD	16175 (Buna) 222155
Other	3XMM J004232.1+411314 ADS 48 HAT-P-6 (Sterrennacht) HAT-P-16 HAT-P-19 HAT-P-28 M31-RV KELT-1 NGC 44 NGC 82 NGC 84 NGC 91 NGC 162 NGC 464 Qatar-3 Qatar-4 Qatar-5 PA-99-N2 WASP-1 WISE 0146+4234 WISE J0005+3737 WISE J004945.61+215120.0

Exoplanets	14 Andromedae b κ Andromedae b υ Andromedae b c d Gliese 15 Ab c HD 13931 b HD 16175 b HAT-P-6b HAT-P-32b WASP-1b WASP-33b Qatar-4b Qatar-5b

Star
clusters

NGC	206 272 752 956 7686
Other	Mayall II RBC EXT8

Nebulae

NGC	7662

Galaxies

Messier	32 110
NGC	5 11 13 19 20 21 27 39 43 48 49 51 67 68 69 70 71 72 74 76 79 80 81 83 85 86 90 93 94 96 97 108 109 112 140 149 160 169 181 183 184 214 218 226 228 229 233 243 252 258 260 262 280 304 317 389 393 404 425 431 477 512 513 523 528 529 531 536 542 561 605 620 668 679 687 700 703 704 705 708 709 710 712 714 717 721 732 753 759 801 812 834 891 906 910 911 912 913 920 937 980 995 996 999 1000 7640 7836
Numbered	I II III IV V VIII IX X XI XVIII XIX XXI
Other	3C 66A 3C 66B Andromeda Galaxy Arp 273 Donatiello I UGC 1840

Galaxy clusters	Abell 262 NGC 68 group

Astronomical events	GRB 101225A SN 1885A (S)

Revision as of 03:12, 26 August 2014

Planetary system

See also

References

External links

Components