Sunday, April 29, 2012

Uranus and [star] 44 Piscium rise

Event Date: May 7th
Time: 5:30 AM

Brief


We have a slightly brighter target this morning to feature, in comparison to Neptune: Uranus is coming back into view!  Although we will not easily see it this month, it is visible enough through binoculars to see low towards the horizon.  Whereas Neptune easily gets lost in atmospheric pollution at nearly-8th magnitude, Uranus is better than 6th magnitude, albeit slightly. 
Here is a zoom-out with the labeling of the 7th planet from the Sun, about 1.8 billion miles away from us.  It is 12º in altitude at the time shown, although can be seen longer through a strong enough telescope until about Sunrise time.



Detailed


By early June, despite the long morning twilight time, we will have a much better view of Uranus, and may even beable to see a little of the green-blue color of the planet from its methane makeup.  Find out more about Uranus' gaseous combination here, noticing that the small percentage of methane gives the most interesting color in my opinion.  The second image shows this color, although it will be fainter when seen in real life at low altitude through small telescopes.  A we see Uranus closer to transit later this year while still dark enough, further out of atmospheric pollution, the color will be seen better.  Try a 6" telescope at minimum, although an 8 or 10" is ideal.  Remember to also keep magnification less than a small telescope's recommended maximum when looking for color, as stronger magnifications can lead to contrast becoming worse; the result of this is less of the blue-green color.  Interestingly, at an identical magnification, the star 44 Piscium is seem only 0,1º from the planet.  A couple of days ago, the two were at their closest in separation, at less than 3 arc-minutes.  As Uranus moves west to east against the stars in pro-grade motion, we can notice the star and Uranus separate further.
The field of view is 1/2º, which easily fits the close pair.

click on images to enlarge: courtesy of Starry Night Pro Plus, version 6.4.3, by Simulation Curriculum Corp.

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