Comet C/2025 A6 (Lemmon) beautifully captured by Petr Horálek on October 9, from the shore of Seč Lake, Czech Republic. The big dipper shines bright above the comet.

Petr is a freelance photographer and popularizer of astronomy with degrees in Astrophysics and the 1st Czech Photo Ambassador of the European Southern Observatory.

Check out his other works at https://www.petrhoralek.com/ and https://www.instagram.com/petrhoralek/?hl=en

Quiz: Was this photo taken before sunrise or after sunset?

Credit: Petr Horálek
6/n

Location and trajectory of comet C/2025 A6 (Lemmon) as seen in the evening sky from the northern hemisphere over the next 2 weeks.

Hope you get to see and photograph it.
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https://stellarium-web.org/
7/n

Outstanding image of Comet C/2025 A6 (Lemmon), along with a diffuse aurora, taken by astro-photographer Josh Dury from Mendip Hills, Somerset, U.K., after sunset on Oct 12 or 13, 2025.

Comet C/2025 A6 (Lemmon) is currently at magnitude 4.7, bright enough to be seen by the naked eye under good observing conditions. Better seen with binoculars. It will brighten further to mag 4.1 during closest approach on Oct 21.

https://www.instagram.com/p/DPvzi95DfB_/
https://www.joshduryphoto-media.com/
8/n

Comet C/2025 A6 (Lemmon) over Mt Shasta, California, beautifully captured by professional photographer Kenneth LeRose last night.
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Kenneth LeRose's website - https://www.krlphoto.com/shop-art
9/n

Telescopic shot of Comet C/2025 A6 (Lemmon) with fine details of its tail imaged by astro-photographers Michael Jäger and Gerald Rhemann on October 13, probably using their remote telescope in Namibia.

How many galaxies do you see in the star background?

Equipment: LRGB 8/1/1/1 min 11" RASA QHY 600
Credit: Michael Jäger, Gerald Rhemann
10/n

Closer shot of Comet C/2025 A6 (Lemmon) taken last night in Austria by Michael Jäger and Gerald Rhemann, with some interesting details in its tail.

Date: 2025-10-20 17.51 UT
Equipment: RGB 15min 11" RASA QHY600 field 3x1,7°

C/2025 A6 (Lemmon) will be closest to Earth and at its brightest today. Hope you get a chance to catch it within the next few days with your binoculars or camera.

https://spaceweathergallery2.com/indiv_upload.php?upload_id=227080
11/n

Yet another outstanding image of Comet C/2025 A6 (Lemmon) by Petr Horálek taken on October 18, from the shore of Seč Lake, Czech Republic.

The pic also captures the aurora caused by a G2 geomagnetic storm that day and the storm's effect on the comet's long ion tail.
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Also, watch the reflections.

Camera: Canon Ra, Sigma Art 50mm, f 1.4, ISO 4000, 43x8s.

Check out Petr's other works at https://www.petrhoralek.com/ and https://www.instagram.com/petrhoralek/?hl=en
#Comet #Lemmon
12/n

A close-up shot of Comet C/2025 A6 (Lemmon) captured by Petr Horálek on Oct 18, from the shore of Seč Lake, Czech Republic.

The G2 geomagnetic storm that day, caused by a CME ejected by the Sun few days earlier, disrupted the comet's long wispy ion tail, but not the shorter and thicker white dust tail.
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Camera: Nikon Z6III, Nikkor 135mm, ISO 1000, f1.8, stack of 40x20s, tracked on Vixen Polarie U.

https://www.petrhoralek.com/?p=25820
#Comet #Lemmon
13/n

Here is another outstanding (composite) image of Comet C/2025 A6 (Lemmon) captured by Lukasz Remkowicz in Poland.

The short thick dust tail and the long ion tail can be seen distinctly in this image.

The dust tail, consisting of vaporized ejecta from the comet, points behind the comet's track and slightly away from the sun, while the ion tail, made of ionized gases, points along the streamlines of the solar wind.

Equipment: Canon EOS R, Samyang 135mm F2.0 ED UMC
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https://app.astrobin.com/u/LukaszRemkowicz#gallery
14/n

Another fabulous shot of Comet C/2025 A6 (Lemmon) over Suotojärvi Lake, northern Sweden, by Petr Horálek, with the multi-color Aurora Borealis lighting up the sky.

Date: 24 October 2025
Equipment: Canon Ra, Sigma 50mm, f1.4, ISO 2500, 3.2s exposure from tripod

https://www.petrhoralek.com/?p=25820
15/n

One more artistic shot of Comet C/2025 A6 (Lemmon), this one by astro-photographer Marina Prol from the Canary Islands, taken probably on October 25.

https://www.marinaprol.com/astroandnightscapes
Credit: Marina Prol
16/n

The horror of the night sky destroyed by Starlink satellites.

This is a still from a time-lapse video of comet C/2025 A6 (Lemmon) by Michael Jäger and Gerald Rhemann. The long exposure image is marred by Starlink satellites crisscrossing the field of view.

@sundogplanets @cosmos4u
Time-lapse video at https://spaceweathergallery2.com/indiv_upload.php?upload_id=227308
Cleaned up images at https://skyweek.wordpress.com/2025/10/27/das-nordliche-finale-der-komet-lemmon-show/
17/n