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Did the moons merge?

Rare Cassini image - two of Saturn's moons, Dion and Ra perform an optical illusion of merging

Saturn's moons Dion (above) and see a unique Cassini image, June 27, 2010
Saturn's moons Dion (above) and see a unique Cassini image, June 27, 2010

The Saturnian moons Dione and Rhea appear to merge in an optical illusion-like image taken by the Cassini spacecraft. Photo: NASA

An interesting image was recently sent by the Cassini spacecraft. Quite a few times several moons appeared in one frame, but not in this way. This is of course an optical illusion, but the two moons appear to cross and they also appear to be identical twins.

וIndeed, the two moons are quite close in size, but Dion, the smaller of the two, which is at the top of the image, is closer to the spacecraft, so the differences in size disappear. Due to the similar albedo or light reflectance between the two moons and due to the location of a relatively large crater near the south pole area of ​​Dune, the moon appears to be transparently merging with Ra.

The diameter of Dion is 1,123 km and of Ra 1,528 km. The image was taken in visible light with Cassini's narrow-angle camera on July 27, 2010.

For the news in Universe Today

9 תגובות

  1. What entertainment: I subtracted 1.1 from 1.6 and got 0.6 instead of 0.5.
    Indeed, the number reported on him in the link given by Gadi is correct - also according to the data in the link I provided.

  2. Michael, thanks for the direction.
    Some of my books are not with me at the moment but you definitely gave me points to follow.

  3. Oops….
    The article from which I took the data is from an event that happened at a different time, so the calculation is based on incorrect data.

  4. As far as I have dug into the matter, see or the ancient 'rea' is, as has been told since the days of the mythological dynasties, an innate product of the force of gravity: between Uranos (sky) and Gaia (earth).
    In any case see it is the 'pulse'. That is, the breath [a life-giving soul].
    But who is D'on?? Does anyone know by any chance..

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