Size Comparison: Jupiter vs Neptune

Comparison of size and physical characteristics between the gas giant planets Jupiter and Neptune.

We see here the immeasurable time required for Neptune to go around the sun. A human on Neptune would not reach a year if we took this planet as a reference. The temperatures are very low. The number of natural satellites for these two celestial bodies are quite high. The compositions of the respective atmospheres are quite similar. We see that Jupiter is much more massive than Neptune.

Color difference.

Yet their colors are different. Jupiter presents orangeish, reddish, brown colors, due to the presence of ammonia crystals on the surface. While Neptune is deep blue, methane largely absorbs light, especially red wavelengths resulting in blue. But in theory its color should rather be similar to that of Uranus, if it were only due to methane, ie aquamarine blue (very light sky blue). There are therefore other chemical elements unknown for the moment which cause Neptune's blue to tend towards dark blue.

Object	Jupiter	Neptune
Type	Gaseous planet	Gaseous planet
Age	4.5 billion years	4.5 billion years
Diameter	139,820 km	49,244 km
Mean radius	69,911 km	24,622 km
Mass	1.89 × 1027 kg	1.02 × 1026 kg
Orbital period	12 years	164.8 years
Rotation duration	10 hours	16 hours
Surface temperature (average)	112 K -161 °C -258 °F	55 K -218 °C -360 °F
Surface gravity	24.79 m/s²	11.15 m/s²
Mean density	1.36 g/cm3	1.63 g/cm3
Orbital distance	760 million km	4.5 billion km
Circumference	439,264 km	154,704 km
Surface area	6.14 × 1010 km2	7.6 × 109 km2
Volume	1.43 × 1015 km3	62.5 × 1012 km3
Escape velocity	59.5 km/s	23.5 km/s
Average orbital speed	13.07 km/s	5.43 km/s
Aphelion	816 million km	4.54 billion km
Perihelion	740 million km	4.46 billion km
Semi major axis	778 million km	4.50 billion km
Inclination	1.3°	1.77°
Satellites	79 natural satellites 0 quasi-satellite 0 artificial satellite	14 natural satellites 1 quasi-satellite 0 artificial satellite
Surface pressure	70 kPa	1 Pa
Atmosphere composition	89% hydrogen, 10% helium, 0.3% methane, 0.026% ammonia	80% hydrogen, 19% helium, 1.5% methane, 0.019% hydrogen deuteride
Distance from the Milky Way center	27,200 light years	27,200 light years

Note: if one of the objects is not visible, it just means that it is too tiny to be displayed compared to the other one.