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Comet Leonard (C2021 A1) (Dec 10 200mm).jpg

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Comet Leonard (C/2021 A1) on the morning of December 10, 2021, with a 200mm telephoto lens for a field of view of 10° x 6.8°. The tail appears to be about 3.5° long here. Taken about 6:30 am MST with the comet as high as it would be, though the sky is already beginning to brighten with the blue of dawn twilight. The distinctive cyan tint of a comet's coma is prominent.

The comet was in Serpens at the time, with the magnitude 2.6 star Alpha Sepentis (aka Unukalhai) at far right (I framed the image to include the star). The reddish double star 47 Serpentis is below the comet.

This is a stack of 4 x 2-minute exposures at f/2.8 (wide open) with the 200mm Canon EF lens on the Canon EOS Ra camera at ISO 800. The comet has trailed a bit over the 4 minutes of exposure time as it was just past its closest to Earth and moving quite quickly eastward toward the Sun at this time. Taken from home in southern Alberta.
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Comets
Comet Leonard (C/2021 A1) on the morning of December 10, 2021, with a 200mm telephoto lens for a field of view of 10° x 6.8°. The tail appears to be about 3.5° long here. Taken about 6:30 am MST with the comet as high as it would be, though the sky is already beginning to brighten with the blue of dawn twilight. The distinctive cyan tint of a comet's coma is prominent. <br /> <br /> The comet was in Serpens at the time, with the magnitude 2.6 star Alpha Sepentis (aka Unukalhai) at far right (I framed the image to include the star). The reddish double star 47 Serpentis is below the comet. <br /> <br /> This is a stack of 4 x 2-minute exposures at f/2.8 (wide open) with the 200mm Canon EF lens on the Canon EOS Ra camera at ISO 800. The comet has trailed a bit over the 4 minutes of exposure time as it was just past its closest to Earth and moving quite quickly eastward toward the Sun at this time. Taken from home in southern Alberta.