Astronomy:MOA-2011-BLG-262L

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Short description: Astronomical object
MOA-2011-BLG-262L
PIA17998-NASA-FirstExomoonCandidate-Or-StarPlanet-20140410.jpg
Artist's impression showing the two models of the MOA-2011-BLG-262L system
Observation data
Equinox J2000.0]] (ICRS)
Constellation Sagittarius[1]
Right ascension  18h 00m 23.48s[2]
Declination −31° 14′ 42.93″[2]
Astrometry
Distance~1,800 or ~23,000 ly
(~560 or ~7,200[2] pc)
Details[2]
Mass0.11+0.21
−0.06
or 0.003 M
Mass115.2327 or 3.6+2.0
−1.7
 MJup
Database references
SIMBADdata

MOA-2011-BLG-262L is an astronomical object of uncertain nature with an orbiting companion, detected through the gravitational microlensing event MOA-2011-BLG-262 in the constellation Sagittarius. Two different models fit the observation equally well - an object of ~3.2 Jupiter mass, likely a rogue planet, at a distance of about 0.56 kiloparsecs (1,800 light-years) and orbited by a ~0.47 M exomoon; or an object of ~0.11 M, likely a red dwarf star, at a distance of about 7.2 kiloparsecs (23,000 light-years) in the galactic bulge, and orbited by a ~17 M planet. The discovery team considers the latter scenario to be more likely, but the former is a better fit.[2][3]

Planetary system

The MOA-2011-BLG-262L planetary system[2]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b 18+28
−10
or 0.54+0.30
−0.19
 M
0.84+0.25
−0.14
or 0.13+0.06
−0.04

References

  1. "Finding the constellation which contains given sky coordinates". 2 August 2008. http://djm.cc/constellation.html. 
  2. 2.0 2.1 2.2 2.3 2.4 2.5 Bennett, D.P. et al. (13 December 2013). "A Sub-Earth-Mass Moon Orbiting a Gas Giant Primary or a High Velocity Planetary System in the Galactic Bulge". The Astrophysical Journal 785 (2): 155. doi:10.1088/0004-637X/785/2/155. Bibcode2014ApJ...785..155B. 
  3. Clavin, Whitney (10 April 2014). "Faraway Moon or Faint Star? Possible Exomoon Found". NASA. https://www.jpl.nasa.gov/news/faraway-moon-or-faint-star-possible-exomoon-found.