| AVERAGE DISTANCE FROM SUN: | 4500 MILLION KILOMETRES |
| DIAMETER: | 49,000 KILOMETRES |
| VOLUME: | 44 TIMES EARTH STANDARD |
| MASS: | 17 1/4 TIMES EARTH STANDARD |
| GRAVITY: | 1.05 TIMES EARTH STANDARD |
| ATMOSPHERE: | VERY COLD GASES |
| NUMBER OF MOONS: | 2, TRITON, NEREID |
| NEPTUNE YEAR: | 165 EARTH YEARS |
| NEPTUNE DAY: | 19 HOURS |