Enceladus is the 6th largest moon of Saturn. It has the distinction of being the most reflective object in the solar system.
The bond albedo of Enceladus is 0.81.
Let’s figure out what the average temperature of Enceladus should be using the standard approach. This is determined by 2 things:
- Longwave Radiation from Saturn.
The combined formula is:
( ( TSI*(1-Ea)/4 + (TSI*(1-Sa)/(Ds/Rs)^2)/4 )/σ )^0.25
TSI = Total Solar Irradiance
Ea = Enceladus Bond Albedo, Sa = Saturn Albedo
Rs = Saturn Radius, Ds = Distance from Saturn to Enceladus
Do the math:
14.82*(1-0.81)/4 + (14.82*(1-0.342)/3.9494^2)/4 = 0.704 + 0.156 = 0.86 (0.86 / 5.67e-8)^0.25 = 62.4K
So 62.4 K should be the average temperature of Enceladus. Is it?
No it’s not.
The average is about 13 K higher. This just goes to show that the standard climate science approach of using greybody calculations is wrong. It’s wrong everywhere except where temperatures accidently correspond.
There is also definitely no explanation for Enceladus’ south pole aside from internal heat.
And if tiny planetary bodies have plenty of leaking internal heat, may not the Earth?
Based on data from previous flybys, which did not show the south pole well, team members expected that the south pole would be very cold, as shown in the left panel. Enceladus is one of the coldest places in the Saturn system because its extremely bright surface reflects 80 percent of the sunlight that hits it, so only 20 percent is available to heat the surface. As on Earth, the poles should be even colder than the equator because the sun shines at such an oblique angle there…
Equatorial temperatures are much as expected, topping out at about 80 degrees Kelvin (-315 degrees Fahrenheit), but the south pole is occupied by a well-defined warm region reaching 85 Kelvin (-305 degrees Fahrenheit). That is 15 degrees Kelvin (27 degrees Fahrenheit) warmer than expected. The composite infrared spectrometer data further suggest that small areas of the pole are at even higher temperatures, well over 110 degrees Kelvin (-261 degrees Fahrenheit). Evaporation of this relatively warm ice probably generates the cloud of water vapor detected above Enceladus’ south pole by several other Cassini instruments.
The south polar temperatures are very difficult to explain if sunlight is the only energy source heating the surface, though exotic sunlight-trapping mechanisms have not yet been completely ruled out. It therefore seems likely that portions of the polar region are warmed by heat escaping from the interior of the moon. This would make Enceladus only the third solid body in the solar system, after Earth and Jupiter’s volcanic moon Io, where hot spots powered by internal heat have been detected.— NASA
Don’t expect NASA to tell you how much Earth’s internal hotspots contribute to recent warming.