C/2021 A1 Leonard comet over Montsec

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Last Thursday 9th of December I travelled to Àger (Lleida, Catalonia – Spain) to capture the C/2021 A1 Leonard comet. Night was predicted to be clear. I was capturing the comet with my friend Ignasi Llorens from Agrupació Astronòmica de Sabadell remote observatories.

I captured many 180″ exposures. The image shown is only one single 180″ exposure blended with the landscape layer (same night and location).


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Image Details

Landscape: 2 pane mosaic 2×30″ 1600 ISO f/2.8

Sky: 1 single 180″ image 800ISO f/2.8

Calibrated with: darks, flats and dark-flats


Data acquisition: 9th of December 2021.

Location: Àger (Lleida, Catalonia – Spain).

Darkness: 21.50 mag/arcsec2



Lens: Samyang 135mm

Camera: SonyA7S mod

Mount: Eq6




Aleix Roig – Prades (Tarragona, Spain), December 2021.

Additional information

Image use

Non-commercial use, Commercial Use