Asteroid 3200 Phaethon near Close Approach to Earth

Mike Olason
Location of photo
Denver, Colorado
Date/Time of photo
17 December 2017, 0011UT
11" SCT f/6.4 and STF-8300M CCD Camera
In these images Asteroid 3200 Phaethon was magnitude 11.0 moving to the southwest across Earth's evening twilight at 0.64 degrees per hour and was about 6.41 million miles from Earth. These images were taken in Evening Twilight about 1 hour after Phaethon's close approach to Earth at 2300UT 2017/12/16.
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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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