| MOA-2007-BLG-400Lb | |
| Discoverer: | Dong et al. |
| Discovery Site: | Mount John University Observatory,  New Zealand |
| Discovered: | September 18, 2008 |
| Apsis: | astron |
| Mass: | 0.9 ± 0.4 |
MOA-2007-BLG-400Lb is an extrasolar planet located approximately 20000 light-years away in the constellation of Sagittarius, orbiting the star MOA-2007-BLG-400L. This planet was detected on September 18, 2008 by the gravitational microlensing by Dong. It has mass between 50% and 130% of Jupiter and orbits between 0.6 and 1.1 AU.