Comet Lemmon (C/2012 F6)

C/2012 F6 (Lemmon) is a long-period comet discovered in Leo on 23 March 2012, by A. R. Gibbs using the 1.5-m reflector at the Mt. Lemmon Survey, located at the summit of Mount Lemmon in the Catalina Mountains north of Tucson, Arizona, USA. Initially, the object was considered to be of asteroidal nature before later observations confirmed its cometary appearance. Comet Lemmon has a highly eccentric orbit, bringing it as close to 0.73 AU from the sun at perihelion and as far as 973 AU from the sun at aphelion. This also leads to the comet’s long-period nature with an orbital period of approximately 8,000 years based on epoch 2050. The comet last reached perihelion on 24 March 2013. (from Wikepedia)

05/10/2013

Marine layer moved in to the valley, and it was forecasted to be an excellent night otherwise, so I packed my CGEM mount and AT72ED refractor and headed to Windy Hills OSP parking lots on Skyline Blvd. Since the parking lot overlooks the valley, the sky glow usually is very bright when it is clear, but when marine layer covers the valley, the sky glow is much better. I usually go to Henry Coe state park to observe the sky on the E and N, but it requires 30-40min highway drive which approves difficult after whole night observation. So I go to Windy Hills instead when marine layer moves in so sky glow impact is minimized.

It was crystal clear with excellent seeing, and warm (since it was above the marine layer) and calm. The marine layers covered entire valley, only mountain ranges surrounding the valley were visible. The city light was mostly blocked but it was still relatively bright upto 20 degrees on N and E horizon. The 1 min exposure still showed reddish background though it looked much better than my backyard shots.

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Comet Lemmon (C/2012L6) 05/10/2013

Exposure: 29 x 60″, ISO1600

Location: Turnout on E Dune road, Morgan Hill, CA

Condition: Excellent transparency, excellent seeing

Equipment: AT72ED F/6 + T3i on Celesstron CGEM

05/20/2013

I setup my telescope on E Dune Road to Henry Coe, the sky was great and there was not much light solution there. It saved ~30 mins drive to the submit. I took pictures of both Panstarrs and Lemmon.

Comet Lemmon (C/2012L6) 05/20/2013

Exposure: 45 x 60″, ISO1600

Location: Turnout on E Dune road, Morgan Hill, CA

Condition: Excellent transparency, excellent seeing

Equipment: AT72ED F/6 + T3i on Celesstron CGEM

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