Description
Size:
Neptune is a comparatively small planet for our solar system with an average
mass of 102.43×1024 kg and an average diameter of 49,572 km. It is roughly 388% the
size of the planet Earth.
Orbital Characteristics:
The planet Neptune obits our Sun at an average speed of 5.43 km/s. At this speed
it takes this planet 60,190 Earth days to complete one revolution around the Sun. One
day on Neptune lasts 16.11 hours.
Distance from Earth:
Neptune is the eigth closest planet to our Sun and the seventh closest planet
Earth. During its revolution of the sun, its maximum distance
from Earth is 4,686,510,980 km and its shortest distance
is 4,306,660,020 km.
Brightness:
Neptune is a relatively bright planet with a
brightness rating of -6.87 V(1,0) and an irradiance of 1.51 W/m2.
Atmosphere:
Neptune has a relatively thin atmosphere with an average density
of 1,638 kg/m3 and a mean surface pressure
of 100 KPa (Cloud Level). The atmosphere is composed of
Molecular hydrogen (80.0%), Helium (19.0%), Methane (1.5%), and other trace elements.
The mean temperature of Neptune is -220 degrees Celsius.
Moons:
Neptune has 13 moons including the following: Naiad,
Thalassa,
Despina,
Galatea,
Larissa,
Proteus,
Triton,
Nereid.
