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Exoplanet List of exoplanets
An artist's impression of MOA-2007-BLG-192Lb orbiting its primary.
Parent star
Star MOA-2007-BLG-192L
Constellation Sagittarius
Right ascension (α) 18h 08m 04s[1]
Declination (δ) −27° 09′ 00″[1]
Distance3000±1000 ly
(1000±400[2] pc)
Observed separation
Projected separation (d) 0.62+0.22−0.16[2] AU
Physical characteristics
Mass(m)3.3+4.9−1.6[2] M
Discovery information
Discovery date 30 May 2008
Discoverer(s) Bennett et al.
Discovery method Gravitational microlensing
Discovery site Mount John University
 New Zealand
Discovery status Announced[2]
Database references
Extrasolar Planets
Exoplanet Archivedata
Open Exoplanet Cataloguedata

MOA-2007-BLG-192Lb, occasionally shortened to MOA-192 b,[3] is an extrasolar planet approximately 3,000 light-years away in the constellation of Sagittarius. The planet was discovered orbiting the brown dwarf or low-mass star MOA-2007-BLG-192L. At a mass of approximately 3.3 times Earth, it is one of the lowest-mass extrasolar planets at the time of discovery. It was found when it caused a gravitational microlensing event on May 24, 2007, which was detected as part of the MOA-II microlensing survey at the Mount John University Observatory in New Zealand.[2]

The system's primary is small as well. At roughly 6% the mass of the Sun, it is probably too small to sustain fusion reactions, making it a dimly glowing brown dwarf.[4] Also, the estimated projected distance between MOA-2007-BLG-192Lb and its primary is approximately 0.62 astronomical units.[2] That means the planet probably formed with lots of ice and gases, more like Neptune (an ice giant planet) in composition than Earth (a terrestrial planet), according to astronomer David Bennett of the University of Notre Dame.[4]


  1. ^ a b "Notes for star MOA-2007-BLG-192-L". The Extrasolar Planets Encyclopaedia. Archived from the original on 2008-09-26. Retrieved 2008-06-16.
  2. ^ a b c d e f Bennett, D. P.; Bond, I. A.; Udalski, A.; et al. (2008), "A Low-Mass Planet with a Possible Sub-Stellar-Mass Host in Microlensing Event MOA-2007-BLG-192", The Astrophysical Journal, 684 (1): 663–683, arXiv:0806.0025, Bibcode:2008ApJ...684..663B, doi:10.1086/589940
  3. ^ Planet Quest: New Worlds Atlas Archived 2008-07-01 at the Wayback Machine., JPL. Accessed on line July 2, 2008.
  4. ^ a b Smallest Extrasolar Planet Portends Other Earths, Richard A. Kerr, ScienceNOW Daily News, June 2, 2008. Accessed on line June 16, 2008.

External links[edit]

Coordinates: Sky map 18h 08m 04s, −27° 09′ 00″