• Source: EZ Aquarii

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 a 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.
William E. Kunkel announced that Luyten 789-6 was a flare star in 1972, after having observed seven flares. It was given its variable star designation, EZ Aquarii, in 1978.
The configuration of the inner binary pair may permit a circumbinary planet to orbit near their habitable zone, however no exoplanets have yet been observed. 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



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. The A and B components of Luyten 789-6 together emit X-rays.




= EZ Aquarii A

=
This 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

=
There 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

=
Like 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 designation for it is GL 866C.




Other details


The high proper motion of EZ Aquarii may have been discovered by Willem Jacob Luyten with his automated photographic plate scanner.




See also


List of nearest stars and brown dwarfs




References






External links


Image EZ Aquarii
Solstation provides an orbital animation as well as a visualization of the habitable zone around EZ Aquarii B.

Kata Kunci Pencarian:

• Daftar bintang terdekat
• Daftar bintang di rasi bintang Akuarius
• Nao Nagasawa
• EZ Aquarii
• EZ
• Lacaille 9352
• Lists of stars
• Kapteyn's Star
• Altair
• Procyon
• Eta Cassiopeiae
• Luyten (disambiguation)
• List of nearest stars