This less-dense cratering suggests past internal activity and resurfacing of the terrain. The ancient Teiresias impact site is so badly overprinted and eroded by impact weathering and degradation that only a circular pattern of hummocks remains to indicate the old crater rim.Ĭloser to the equator, the terrain is darker and has fewer craters. For instance, near the prominent peaked crater Telemachus (Odysseus’ son in “The Odyssey”) are the remnants of Teiresias crater (named after a famous soothsayer of ancient Greece). The Tethyan northern hemisphere is lighter coloured and heavily reworked from ages of bombardment. Also contributing to the high reflectivity is that Tethys is bombarded by Saturn E-ring water-ice particles generated by geysers on Enceladus. Many of the crater floors on Tethys are bright, which also suggest an abundance of water ice. Tethys has a high visual albedo of 1.229, again suggesting a composition largely of water ice, which would behave like rock in the Tethyan average temperature of −187☌. This, in turn, implies that Lagrangian points around the Earth and the Moon might be more stable than previously thought to be in the past. The fact that Tethys and other Saturnian moons have such objects implies that Lagrangian points might be stable for millions of years. These smaller moons are held in Lagrangian points (L4 and L5, respectively), where objects are stable with the larger controlling body. Calypso is an irregular body 34 × 22 × 22 km that orbits 60° behind Tethys. Telesto is an irregular body 34 × 28 × 36 km that orbits 60° ahead of Tethys. Likewise, Tethys has gravitationally locked two smaller moons into its own subsystem – Telesto and Calypso.
#Moon atlas with images at 24km plus#
Tethys’s density is 0.97 times that of liquid water, which suggests that Tethys is composed almost entirely of water ice plus a small amount of rock.Īs with all but two of the major Saturnian moons, Tethys is tidally locked in phase with its parent planet – one side always faces toward Saturn. This may be because its proximity to Saturn causes more tidal warming, and that warming kept Tethys partially molten longer, erasing or dulling more of the early terrain. This cold, airless and heavily scarred body is very similar to sister moons Dione and Rhea except that Tethys is not as heavily cratered as the other two. Tethys is a small moon 1,066 km in diameter that orbits 294,660 km from Saturn. Notes: A negative orbital period indicates a retrograde orbit It’s such a big gap that you could just about fit the other seven significant planets into the space between the two worlds.Some of the More Interesting Moons of Saturn Index The Moon is farther away from Earth than people often think.Ī good ballpark number to remember is that the Moon is about a quarter of a million miles away, or just about 400,000 kilometers. And also how you can find the landing site of Apollo 11. Here are five things about the Moon that you can share with others when you’re gazing up at our natural satellite. However, it isn’t at all hard to scan the unique region of the moon as Mare Tranquillitatis, or the Sea of Tranquility, where the two Apollo 11 astronauts Neil Armstrong and Edwin “Buzz” Aldrin gambol for a few short hours on the lunar surface.ġ969, Sunday 20th of July the night when the well-known event took place, the moon was in a waxing crescent phase, 35.4% brightened by the sun. The picture is displaying the map of the Moon showing prospective sites for Apollo 11.
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