Comet C/2018 N1 (NEOWISE) Gif

Mike Olason
Location of photo
Denver, Colorado
Date/Time of photo
19 July 2018, 0854UT
11" SCT f/6.4 and STF-8300M CCD Camera
Comet C/2018 N1 (NEOWISE) was at perihelion August 1 when it was 121 million miles from the Sun. In this GIF the comet was 39 million miles from the Earth and magnitude 13.9. The images were only 30 seconds long due to the fact that the comet was moving at 0.15 degrees per hour across Earth's night sky, longer images with my equipment would have shown a streaked comet. With such short images the magnitude estimate may more correctly reflect the magnitude of the nucleus rather than the overall magnitude of the coma and dust cloud. Overall comet brightness estimates by others show a rather wide range of from 9 to 13.
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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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