1) Position in the solar system: 8th planet from the sun
2) Closest distance to the sun: Perihelion: 4.444x10^9 km
3) Furthest distance from the sun: Aphelion: 4.546x10^9 km
4) Minimum distance to Earth: 4.292x10^9 km
5) Neptunian day: 16.11 hr
6) Neptunian year: 164.8 Earth years
7) Axis tilt: 28.32°
8) Orbital inclination to ecliptic: 1.77°
9) Orbital eccentricity: 0.0086
10) Diameter (equatorial): 49,528 km
11) Mass: 1.024x10^26 kg, approx. 17.1 times that of Earth
12) Gravity: 1.14 (Earth = 1)
13) Escape velocity: 23.5 km/s
14) Temperature: -201°C at 1.0 bar pressure
15) Mean surface pressure: >1000 bars
16) Atmospheric composition: 80% hydrogen, 19% helium, 1.5% methane (numbers do not add up to 100% due to uncertainty) with trace amounts of hydrogen deuteride ("heavy" hydrogen) and ethane, and aerosolized crystals of ammonia ice, water ice, ammonia hydrosulfide, and methane ice
17) Number of moons: 13
18) Ringed system? Yes
19) Magnetic Field? Yes