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Ursa Astronomical Association

Telescopic comet NEOWISE - 17.7.2020 at 01.22 Vesanto Observation number 92048

Visibility Unclassified

Esko Lyytinen, Ursa (Helsinki)

I spotted a comet with the same old tried and tested technique

As an improvement on the previous one, a little tracking stand was now in use.

The image and reference image are each 40x0.5 s ISO 100 exposures, with a Canon EOS 6 camera and a 135mm F / 3.5 small telescope.

Pictured is the north at the top left.

NLC clouds interfere with tail length measurement. It should stand out by a degree. In the larger picture, up to two degrees may take shape. With the eyes and not in a normal single image, these clouds were not separated, but at the end of the observation session, apparently, even bright NLC clouds were apparently visible at a higher angle in the NE direction. I still couldn't see the comet with 20x80 binoculars.

There were no brighter stars in the image, but it does stand out with the dimest characters (lm 8) on the HvAb map. Maybe I’ll still try to measure the brightness of the comet Koma (the brightness of the star-shaped core in the picture) with some sort of semi-manual pixel integration, as long as the right time is found.

The sun was about 6 degrees below the horizon and the comet at just over 20 degrees.

With the naked eye, I just separated Capella when I had first found it with binoculars.

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Additional information
  • Observation target
    • Comet
  • Name of the observation target
    • C/2020 F3 (NEOWISE)
    • Luokittelematon
  • Visibility of the comet
    • Telescopic comet
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