MOA-2007-BLG-400L
Encyclopedia
MOA-2007-BLG-400L is a star
located approximately 20000 light-year
s away in the constellation
of Sagittarius
. This star is presumed to be a red dwarf
with a spectral type of M3V, based on its mass of 0.35 MS.
was announced by the Microlensing Observations in Astrophysics
(MOA) Collaboration. This planet was detected by the gravitational microlensing method based on an event recorded in September 2007. The Microlensing Follow Up Network (μFUN) has not yet positively identified the source star.
Star
A star is a massive, luminous sphere of plasma held together by gravity. At the end of its lifetime, a star can also contain a proportion of degenerate matter. The nearest star to Earth is the Sun, which is the source of most of the energy on Earth...
located approximately 20000 light-year
Light-year
A light-year, also light year or lightyear is a unit of length, equal to just under 10 trillion kilometres...
s away in the constellation
Constellation
In modern astronomy, a constellation is an internationally defined area of the celestial sphere. These areas are grouped around asterisms, patterns formed by prominent stars within apparent proximity to one another on Earth's night sky....
of Sagittarius
Sagittarius (constellation)
Sagittarius is a constellation of the zodiac, the one containing the galactic center. Its name is Latin for the archer, and its symbol is , a stylized arrow. Sagittarius is commonly represented as a centaur drawing a bow...
. This star is presumed to be a red dwarf
Red dwarf
According to the Hertzsprung-Russell diagram, a red dwarf star is a small and relatively cool star, of the main sequence, either late K or M spectral type....
with a spectral type of M3V, based on its mass of 0.35 MS.
Planetary system
In September 2008, the discovery of an extrasolar planetExtrasolar planet
An extrasolar planet, or exoplanet, is a planet outside the Solar System. A total of such planets have been identified as of . It is now known that a substantial fraction of stars have planets, including perhaps half of all Sun-like stars...
was announced by the Microlensing Observations in Astrophysics
Microlensing Observations in Astrophysics
Microlensing Observations in Astrophysics is a collaborative project between researchers in New Zealand and Japan, led by Professor Yasushi Muraki of Nagoya University. They use microlensing to observe dark matter, extra-solar planets, and stellar atmospheres from the Southern Hemisphere...
(MOA) Collaboration. This planet was detected by the gravitational microlensing method based on an event recorded in September 2007. The Microlensing Follow Up Network (μFUN) has not yet positively identified the source star.