Updated June 28, 2005
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*New 11/28/01* Notes on regional, local and GPS-Specific site seeing forecasts and prediction
*New 11/29/01* Using Skew-T/Log-P Diagrams to determine and possibly forecast seeing and transparency conditions
The star Betelgeuse photographed at an
effective focal length of 15,000mm
through the ASO Planetary Imaging Telescope on January 20, 2002. The
seeing
steadiness rating (ASO scale 1-10, with "10" best, perfect) was
about an
8.5, about the best it gets in Arkansas Winter. This clearly
illustrates
that nothing is "perfect." Although the images of Jupiter
and Saturn
appeared rock-solid even at about 600x in the CCTV system, the details were
slightly washed out due to the slight degree of turbulence seen clearly in
this image. You can plainly see the diffraction rings and central
obstruction image of Betelgeuse (about 12% intra-focus), but the slight
turbulence clearly masks a perfect view.
This images was obtained through the 12" telescope operating at f/55
afocally with a 10mm Televue Radian eyepiece; exposure was ISO 100 @ 1/2
sec.
Copyright Arkansas Sky Observatory © 2001 [A.S.O.] All rights reserved. Revised: June 28, 2005
