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Júpiter - 2015-02-10 - 23h06 - C9,25 f13 0,25ap ASI 120MM RGB.

In Europa the picture on the left of the planet and Io and its shadow in transit on the disk of Jupiter.

The image is obtained with the C9,25 "and ASI 120MM working an image scale of 0.25" / pixel.

The most prominent feature of Io is an equatorial band of yellow-white color that is covered with highly reflective ice materials. With a visual albedo of 0.6, this bright spot in stark contrast to the polar regions satellite reddish-brown color, with a visual albedo of just 0.3. These dark polar regions were sources of confusion for astronomers.

When viewed against a dark sky, dark polar caps Io tend to blend and easily confused with the sky background, distorting the shape of the moon. This deceptive appearance led William Herschel, one of the best observers of his time, to suggest that Io was not spherical. Pickering, a century later, also confused the bright equatorial band with the satellite itself and concluded that Io was a body of elongated shape. It was not until 1891, that Barnard dispel this notion. Noting with 91cm refractor of Lick, Barnard saw Io as a circulated tiny disk clearly topped by dark ice caps separated by a bright band approximately parallel to Ecuador Jupiter.

It was not until recently that this striking aspect has been captured by some fans.

I'm very, very happy with this, because it is difficult to record details of Ganymede, most details that seem to be in amateur images of Ganymede, often processing artifacts, noise, effects of seeing and / or diffraction. And Calixto discs and Io image I sent a few weeks ago showing the gloom around the shadow of Callisto. That image despite having a scale image almost double this (0.13 "/ pixel), was quite softer and did not have enough to show details on the moons resolution.

In Calixto image a few weeks ago, and he announced beforehand, that the apparent details about moons did not believe they were real. But in the picture accompanying today it seems so obvious and without doubt, I have registered the polar ice caps and equatorial band of this small lunita that neither I ask your opinion.

Ganymede reaches almost 2 "in opposition, but Io is much smaller and at the time of this picture, had only 1.1". Recording details in a small world of just 1.1 "...

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