By W. Romanishin
An advent to Astronomical Photometry utilizing CCDs through W. Romanishin
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Extra info for astronomy - introduction to astronomical photometry using ccd - romanishin
Pixels that cover too large an angle on the sky will not capture all the detail that the optics and seeing allow. Pixels too small in angular size will result in a very small total field of view and problems with read noise and other fixed noise sources, as the light will be spread over too many pixels. To balance field of view and resolution, it is ideal to have the pixel sizes correspond to about one third to one half of the seeing FWHM. ) The best time to aim for this is before the telescope is purchased and the CCD is purchased.
This results in a system with an effective focal length much larger than the focal length of the primary mirror. 4. Cassegrain and related systems can fit a large focal length into a relatively short tube. 9 meters in length. 5 Field of View and Sky Coverage The field of view (FOV) is the sky area covered by an image taken with a telescope. the FOV depends on both the focal length of the telescope and the area of the imaging detector. With single CCD detectors, the angular area covered tends to be smaller with larger telescopes, as larger telescopes usually mean longer focal lengths.
LARGE TELESCOPES: EXPENSIVE TOYS FOR GOOD BOYS AND GIRLS Mexico State U. First light in 1994. edu) IRTF (Infrared Telescope Facility) 3 meter on Mauna Kea. Funded by NASA, optimized for infrared work. Half of all time devoted to solar system studies. edu) Shane 3m (Lick 120 inch). Built in 1959, and was the worlds 2nd largest telescope for quite a time. On Mt Hamilton, 20 miles from San Jose, California, the site is no longer a dark one, due to rapid growth of San Jose. Chapter 7 The Atmosphere: Bane of the Astronomer The Earth’s atmosphere is, overall, a Good Thing- it provides us with oxygen and at least mostly shields us from nasty DNA- destroying things like x-ray and ultraviolet EMR and cosmic rays.
astronomy - introduction to astronomical photometry using ccd - romanishin by W. Romanishin