EZ Aquarii

**EZ Aquarii**
Observation data Epoch J2000
Constellation (pronunciation)	Aquarius
Right ascension	22h 38m 33.4s
Declination	-15° 18' 07"
Apparent magnitude (V)	12.87
Characteristics
Spectral type	M5 V
U-B color index	1.50
B-V color index	1.99
Variable type	Flare star
Astrometry
Radial velocity (R_v)	-59.9 km/s
Proper motion (μ)	RA: 2364 mas/yr Dec.: 2236 mas/yr
Parallax (π)	289.50 ± 4.40 mas
Distance	11.3 ± 0.2 ly (3.45 ± 0.05 pc)
Absolute magnitude (M_V)	14.68
Visual binary orbit
Companion	EZ Aquarii B
Period (P)	2.25 yr
Semimajor axis (a)	0.346"
Eccentricity (e)	0.44
Inclination (i)	112.4°
Longitude of the node (Ω)	162.1°
Periastron epoch (T)	1987.24
Visual binary orbit
Companion	EZ Aquarii C
Period (P)	? yr
Semimajor axis (a)	?"
Eccentricity (e)	?
Inclination (i)	?°
Longitude of the node (Ω)	?°
Periastron epoch (T)	?
Other designations
Luyten 789-6, GCTP 5475.00, LHS 68, GJ 866 A, G 156-031.
Database references
SIMBAD	data

EZ Aquarii is a triple star system approximately 3.4 pc or 11.3 light-years from the Sun, in the constellation Aquarius. It is also known as Luyten 789-6. All three components are M-type red dwarfs. The main component is also a spectroscopic binary.

The nearest neighbouring star is Lacaille 9352, 1.29 pc or 4.21 ly away.

Aquarius Constellation

[edit] Components

NAME	Right ascension	Declination	Apparent magnitude (V)	Spectral type	Database references
EZ Aquarii B (GJ 866 B)	22^h 38^m 00^s	-15° 18' 00	12.33	M5e	Simbad
EZ Aquarii C (GJ 866 C)	22^h 38^m 37.25^s	-15° 17' 07.1			Simbad

van Maanen, A., "Preliminary Parallaxes of Luyten 789-6 and Wolf 424", 12/1939, Publications of the Astronomical Society of the Pacific, Vol. 51, No. 304.
Woitas, J.; Leinert, Ch.; Jahreiß, H.; Henry, T.; Franz, O. G.; Wasserman, L. H., "The nearby M-dwarf system Gliese 866 revisited", 1/2000, Astronomy and Astrophysics, v. 353.