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Jupiter is a big planet and it is located relatively near to us so as to be easily observed through a telescope. At opposition it almost measures 50 arcseconds. Callisto is one of its four Galilean moons. It is really small apparently, 1.6 arcseconds exactly in the picture above.

Even though it is really small to be explored through an earth-based telescope, Antonello Medugno has been able to extract some albedo features. He used its 14 inch Meade LX200 and an effective focal length of almost 9 meters. Figure out a refractor tube of 9 meters long ...

2015-11-13 12:03:39       
You have a real talent with your diwarng, especially your small stuff. I'm amazed by how much detail you manage to cram in there! :)Hip Hop Anonymous
2015-10-18 15:41:49       
A 4.5 reflector will get you there cheap about $200. You might even find a 6 in the crnlaaece section of a good astonomical website. But get a good one not Jason or Bushnell, and not the no-name brand cheapos on Ebay. Go with Orion, Celestron or Meade in that order. A 4.5 or 6 Starblaster is a good option. You'll see the rings on Saturn, Great Red Spot and bands on Jupiter, Polar cap on Mars, hundreds of craters on the moon. In Deep Space, you will not see any galaxies, but you will see nebula and star clusters, plus the occasional bright comet.For a beginnrer, a 4.5 or 6 Dobsonian reflector is a great way to go. Don't get an equatorial it's too complicated and heavy. In light polluted cities your best objects will be in the Solar System Moon, Saturn, Jupiter, Mars, Comets.Jim
2012-10-07 12:17:22       
Intelligence and slimpiicty - easy to understand how you think.
2011-08-20 17:09:29       
Your story was really inofrmtaive, thanks!
2011-04-11 22:49:40       
AWsDMy You've hit the ball out the park! Incredible!
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