EZ Aquarii

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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 (Rv) -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 (MV) 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
Aquarius Constellation

Contents

[edit] Components

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


[edit] References

  • 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.

[edit] See also

[edit] External links