EZ Aquarii
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Aquarius |
| Right ascension | 22h 38m 33.73s[1] |
| Declination | –15° 17′ 57.3″[1] |
| Apparent magnitude (V) | 12.87 (13.33/13.27/14.03)[2] |
| Characteristics | |
| Spectral type | M5 V[2] |
| U−B color index | +1.54 |
| B−V color index | +1.96[3] |
| R−I color index | +0.64[citation needed] |
| Astrometry | |
| Radial velocity (Rv) | –59.9[4] km/s |
| Proper motion (μ) | RA: +2314[5] mas/yr Dec.: +2295[5] mas/yr |
| Parallax (π) | 294.3 ± 3.5[6]:{{{3}}} mas |
| Distance | 11.1 ± 0.1 ly (3.40 ± 0.04 pc) |
| Absolute magnitude (MV) | 15.64/15.58/16.34[2] |
| Details | |
| Mass | 0.11/0.11/0.10[2] M☉ |
| Temperature | 2,650[7] K |
| Orbit[8] | |
| Primary | EZ Aquarii AC |
| Companion | EZ Aquarii B |
| Period (P) | 2.2506 ± 0.0033 yr |
| Semi-major axis (a) | 0.346″ ± 0.004" |
| Eccentricity (e) | 0.437 ± 0.007 |
| Inclination (i) | 112.4° ± 0.5° |
| Longitude of the node (Ω) | 162.1° ± 0.4° |
| Periastron epoch (T) | 1987.236 ± 0.014 |
| Argument of periastron (ω) (secondary) |
–17.7° ± 1.1° |
| Other designations | |
| Database references | |
| SIMBAD | data |
EZ Aquarii is a triple star system approximately 11.3 ly (3.5 pc) from the Sun in the constellation Aquarius. It is also known as Luyten 789-6 and Gliese 866 and all three components are M-type red dwarfs. The pair EZ Aquarii AC form a spectroscopic binary with a 3.8-day orbit and a 0.03 AU separation. This pair share an orbit with EZ Aquarii B that has an 823-day period.[9] The A and B components of Luyten 789-6 together emit X-rays.[10]
EZ Aquarii is approaching the Solar System and, in about 32,300 years, will be at its minimal distance of about 8.2 ly (2.5 pc) from the Sun.[11] The ChView simulation shows that currently its nearest neighbouring star is Lacaille 9352 at about 4.1 ly (1.3 pc) from EZ Aquarii.
See also
References
- ↑ 1.0 1.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 2.2 2.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 5.0 5.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
External links
- Image EZ Aquarii
- Solstation provides an orbital animation as well as a visualization of the habitable zone around EZ Aquarii B.
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