Such "warm" temperatures are unlikely to be due to heating of the surface by the feeble sunlight striking Enceladus' south pole. Time record 33, the last full 5-s integration before ingress, shows the deepest absorption. It reflects almost 100% of the sunlight it receives.
Enceladus' surface is composed mostly of nearly pure water ice except near its south pole, where there are light organics, CO2, and amorphous and crystalline water ice, particularly in the region dubbed the “tiger stripes.”
Regardless of the fissure temperature, surface temperatures above 200K can only be maintained by conduction within a few tens of centimeters of the assumed fissure wall. The high sublimation erosion rates (0.25 m/yr at 180K, rising to over 100 m/yr at 220K) imply that the fixed boundaries we have previously assumed are unrealistic. This high reflectivity is caused by a very smooth surface of fresh water ice. Cassini discovered that Enceladus conceals a global ocean of liquid saltwater below its surface, and photographed jets of that water shooting into space. They are a strong indication that internal heat is leaking out of Enceladus and warming the surface along these fractures. Surface Temperature: – 198 degrees C History: On August 28, 1789, William Herschel, the famed British astronomer discovered Enceladus in its orbit around Saturn. Enceladus is a medium-size moon of Saturn, with a diameter of about 500 km.Its surface temperature is quite chilly, ranging between 32.9 K (-240 degrees Celsius) and 145 K (-128 degrees Celsius); this is partially because of its distance from the Sun, and also because of its highly reflective surface.
Observations of Saturn's satellite Enceladus using Cassini's Visual and Infrared Mapping Spectrometer instrument were obtained during three flybys of Enceladus in 2005.
They did this to avoid contaminating Enceladus or Titan, another nearby moon that could also harbour life, with Earthly microbes. Enceladus has the highest albedo of any known object in the Solar System. The ray altitude above Enceladus' surface corresponding to time record 33 ranged from 30 to 7 km. Since Enceladus reflects so much of the sunlight it receives, its surface temperature is a chilling … Whatever Enceladus's near-surface temperatures, things are presumably warmer deeper down.
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