Comet 158P Kowal-Linear passed by Comet 45P Honda-Mrkos-Pajdusakova

Mike Olason
Location of photo
Denver Colorado
Date/Time of photo
24 & 25 May 2017, 0349UT & 0342UT
11" SCT f/6.4 and STF-8300M CCD Camera
Comet 45P approached and passed the background Comet 158P on the nights of May 24 & 25 as seen from the night skies of Denver. Unfortunately, it was daylight in Denver when 45P was just 0.017 degrees from 158P with 158P undoubtedly in the dusty glow of 45P. This mosaic of the images from the 2 consecutive nights is not very pretty until one realizes both comets are about magnitude 20 and the individual images stacked on comet 158P are a combined 110 minutes (May 24) and 80 minutes (May25) taken from the light polluted skies of Denver with only an 11" SCT. The comets were about 0.1 degree apart on both nights. 158P has a well defined nucleus while 45P has become a dusty glow with a hard to find nucleus on images that are stacked on 45P.
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Mike Olason

About Mike Olason

I started imaging comets in 1994 with an ST-5 CCD Camera and an 11" SC Telescope. Since then the CCD cameras have changed (ST-7, ST-402ME and STF-8300M), but I am still using the 11" SC Telescope. Naturally I have used a lot of smaller telescopes to obtain larger fields of view. I live south of Denver at an elevation of 6150 feet which allows me to image comets down to almost magnitude 21 on a perfect night. Unfortunately ChemTrails have turned Denver cloudy and dry. I use the camera software CCDOps to process my images. All I do to each image is dark subtraction and flat field, stack images as required to show faint comets, contrast/bright adjust the final image and maybe use a median filter to reduce the image noise. The result is an image that reflects reality and will never win any picture of the day award. If you would like to use my images for a project or ask a question send me an email to "".
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