Sunday, November 9, 2025

Scraps from last night

 Last night I was able to get in only one shot of Comet Lemmon with the AT80EDT refractor before it set behind the Bristol Head ridgeline.  A second shot showed only the tail:

Tail of Comet C/2025 A6 (Lemmon).  AT80EDT refractor.


The comet is past peak brightness, but without the moon it still shows a nice tail in photographs.

After the comet sank out of sight I turned the telescope to the open star cluster M23 in Sagittarius:

M23

 M23 is just one cluster among many in this densely populated section of the Milky Way.  Here is a finder chart for context:

credit: SkySafariAstronomy.com

 After the star cluster, the dwarf-planet Pluto was a good target:

Pluto (circled) on 08 Nov.

Here is an image from 16 Oct with about the same FOV, taken with a 135mm f/2 lens:

Pluto (circled) on 16 Oct.

Comparison of the two images reveals how much Pluto has moved with respect to the background stars over three weeks.  Pluto is currently about magnitude 14.6 in the constellation Capricornus.

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