Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Aquarius |
Right ascension | 22h 38m 33.73s[1] |
Declination | −15° 17′ 57.3″[1] |
Apparent magnitude (V) | 12.38[2] (13.03/13.27/15.07)[3] |
Characteristics | |
Spectral type | M5 V[3] |
B−V color index | +1.96[4] |
Variable type | Flare star + BY Dra[5] |
Astrometry | |
Radial velocity (Rv) | −59.9[6] km/s |
Proper motion (μ) | RA: +2314[7] mas/yr Dec.: +2295[7] mas/yr |
Parallax (π) | 293.6 ± 0.9 mas[8] |
Distance | 11.11 ± 0.03 ly (3.41 ± 0.01 pc) |
Absolute magnitude (MV) | 14.75[9] (15.33/15.58/17.37)[3] |
Orbit[10] | |
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° |
Details | |
EZ Aquarii A | |
Mass | 0.1187±0.0011[8] M☉ |
Luminosity | 0.00078[8] L☉ |
EZ Aquarii C | |
Mass | 0.0930±0.0008[8] M☉ |
Luminosity | 0.00012[8] L☉ |
EZ Aquarii B | |
Mass | 0.1145±0.0012[8] M☉ |
Radius | 0.21±0.04[8] R☉ |
Temperature | 2650±200[8] K |
Other designations | |
Database references | |
SIMBAD | data |
Location of EZ Aquarii in the constellation Aquarius |
EZ Aquarii is a triple star system 11.1 light-years (3.4 parsecs) from the Sun in the constellation Aquarius within the Milky Way. It is also known as Luyten 789-6, Gliese 866 and LHS 68. It is variable star showing flares as well as smaller brightness changes due to rotation. The aggregate mass of the system is 0.3262±0.0018 solar masses. All three seem to have masses close to the hydrogen burning mass limit[13]. The high proper motion of EZ Aquarii may have been discovered by Willem Jacob Luyten with his automated photographic plate scanner[14].
The configuration of the inner binary pair may permit a circumbinary planet to orbit near their habitable zone. 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. The ChView simulation shows that currently its nearest neighbouring star is Lacaille 9352 at about 4.1 ly (1.3 pc) from EZ Aquarii.
System
editAll 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. The A and B components of Luyten 789-6 together emit X-rays.
EZ Aquarii A
editThis star is a red dwarf of type M5V which has a mass of 0.1187±0.0011 solar masses. It has a parallax of 293.6±0.9 mas. Its period in days around EZ Aquarii C is 3.786516±0.000005 d with an eccentricity of 0 which together make up the primary of the system. It has an absolute magnitude at wavelengths centered at 5500 Angstroms of 15.33 making it the brightest of the three. Some alternate designations for it are EZ Aqr, GL 866A, L 789-6 A and LHS 68.
EZ Aquarii B
editThere is less known about this star compared to A. Its type is likely a type MV with a mass of 0.1145±0.0012 solar masses. It orbits the AC system with a period of 822.6±0.2 d at an eccentricity of 0.439±0.001. It has an absolute magnitude of 15.58, making it dimmer than A but brighter than C. Some alternate designations for it are GL 866B and L 789-6 B.
EZ Aquarii C
editLike the other two, this star is likely a type MV with a mass of 0.0930±0.0008 solar masses. It orbits A in a period of 3.786516±0.000005 d with a nearly circular orbit. It is the dimmest of the three with an absolute magnitude of 17.37. An alternate destination for it are GL 866C.
See also
editReferences
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Gliese1991
was invoked but never defined (see the help page). - ^ Cite error: The named reference
SIMBAD
was invoked but never defined (see the help page). - ^ Woitas, Jens; Leinert, Christoph; Jahreiß, Hartmut; Henry, Todd; Franz, Otto; Wasserman, Larry (1999-10-22). "The nearby M-dwarf system Gliese 866 revisited". arXiv:astro-ph/9910411.
- ^ "EZ Aquarii 3". www.solstation.com. Retrieved 2023-05-01.
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External links
edit- Image EZ Aquarii
- Solstation provides an orbital animation as well as a visualization of the habitable zone around EZ Aquarii B.