EZ Aquarii
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | 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 |
| Orbit | |
| Companion | EZ Aquarii B |
| Period (P) | 2.25 yr |
| Semi-major axis (a) | 0.346″ |
| Eccentricity (e) | 0.44 |
| Inclination (i) | 112.4° |
| Longitude of the node (Ω) | 162.1° |
| Periastron epoch (T) | 1987.24 |
| Other designations | |
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.
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.