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I beleive you will find all you need to know, and more, in the Australian National University/edX MOOC ANU-Astro2x on Exoplanets which I highly recommend.


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The smallest natural object that I know of that has been detected from an Earth-bound telescope is 2011 CQ1, a one-meter asteroid observed while specifically looking for NEOs. As DeerHunter mentions in a comment, smaller artificial objects are identified and tracked, mostly by NORAD and some other national defence centers.


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Stromgren u just about incorporates 330nm, as does Bessel U, RGO U (all filter responses found here). But the bluest one appears to be the Gunn u-band filter (response reproduced below). Of course this is the response without taking into account the atmosphere, which is sharply falling at wavelengths of 330nm, the response of the CCD and efficiency of ...


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Designs where the curved primary mirror is fixed, and steering is achieved via a moving flat mirror (siderostat) in front of it (or a set of flats) have been done before. One example is the Pfund telescope. The main design constraint that led to the invention of the Pfund telescope was the need to have a focal point which is fixed in space and easily ...


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The obvious answer is our own, the Mikyway. The only problem is, Where you are in the world? We all will see it differently, many factors play into this, your elevation,city lights,e.t.c One of the biggest problems is light, it has plagued astronomers for years. Depending on how good your telescope is, the next closest galaxy to us is the Andromada galaxy ...


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The nearest one is the one you are on: Milky Way. It can be seen from any place, as it is all around us. If you want to actually look at a whole galaxy in a simple view, then the nearest galaxies easy to be observed are the Small and Large Magellan Clouds, and the Galaxy of Andromeda. There are galaxies nearer that those, but harder to be observed. A quite ...



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