C/2020 F3 (NEOWISE) and Merriam Crater | 7 July 2020 | San Francisco Volcanic Field, Arizona, USA (Jeremy Perez)

Celestial hemisphere: Northern · Constellation: Auriga (Aur) · Contains: Solar system body or event

C/2020 F3 (NEOWISE) and Merriam Crater | 7 July 2020 | San Francisco Volcanic Field, Arizona, USA, Jeremy Perez

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C/2020 F3 (NEOWISE) and Merriam Crater | 7 July 2020 | San Francisco Volcanic Field, Arizona, USA

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C/2020 F3 (NEOWISE) and Merriam Crater | 7 July 2020 | San Francisco Volcanic Field, Arizona, USA

This was my third early morning observing the comet as it began its spectacular apparition. There were no nearby clouds to contend and that permitted the view I was after above Merriam Crater. On any given day that old cinder cone is perfect—then catching it sharing the horizon with this graceful comet gets kind of goosebumpy for me.

I tried to see how long I could observe it visually with binoculars and was able to see it from 3:31–4:54AM—basically right on the horizon up to 13° at the end when the sun was 5° below the horizon. I was able to observe it naked eye, including the tail, up to the last 20 minutes or so.

Theta Auriga was conveniently 3° away for comparison, so naked eye the tail appeared about 1° in length. Through binoculars more like 2.5° long and photographically, about 3.5°. It kept its yellowish color up to the last 20 minutes or so when the sky was pretty bright and making it hard to detect. The pseudonucleus appeared more neutral in color and the tail had that bifurcation both visually through binoculars and photographically. I made a quick field sketch — first one I've done in a while.

Photographically I think I was picking up a hint of an ion tail very faintly just left of the curving dust tail.

Image is from east of Flagstaff, Arizona, USA. 3:44AM MST/1044 UT.
The comet is 2° above horizon/sun is 16° below horizon.
Image comprised of 6 sequential exposures stacked and aligned to improve signal-to-noise ratio.
Canon EOS 6D Mark II, Canon EF 70-300mm lens at 130mm, f/5.0, 2 sec, ISO 6400.

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C/2020 F3 (NEOWISE) and Merriam Crater | 7 July 2020 | San Francisco Volcanic Field, Arizona, USA

C/2020 F3 (NEOWISE) and Merriam Crater | 7 July 2020 | San Francisco Volcanic Field, Arizona, USA

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C/2020 F3 (NEOWISE) and Merriam Crater | 7 July 2020 | San Francisco Volcanic Field, Arizona, USA

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