M13 - 2021 Season (lowenthalm)

M13 - 2021 Season

Acquisition type: Lucky imaging

M13 is passing through its best position from my backyard, so I thought I would collect some images on a couple of nights of good seeing and try for some better detail and color than in my previous images from a couple years ago.

Tons of blue stragglers stars are visible, a common sight in large globular clusters, as well as a number of brighter orange stars stars that are probably getting toward the end of their lives (sun-like stars nearing their red giant stages). The blue stragglers are thought to be created by the merger of smaller cooler stars to produce more massive, hotter and therefore bluer stars that look younger than they actually are.

The little distant 16th magnitude spiral IC 4217 can be seen at the far left, while 18th magnitude galaxy (irregular, probably) PGC 3501401 can be seen at the bottom center edge. IC 4217 is about 540 million light years away, while PGC 3501401 is more like 1.2 billion light years away.

Just to the right of top center, you can see a very distant cluster of galaxies, anchored by a couple of "bright" elliptical galaxy. These galaxy clusters are probably at least 2 billion light years away. No names or IDs, just anonymous galaxies! Another anonymous galaxy cluster can be seen at the right center edge of the field.

The dimmest stars are around visual magnitude 21, which is a little lower than I usually get. Contributing factors here were that transparency probably wasn't so great those nights, I used shorter exposures than usual to get better core detail and I also had a little field tilt that distorted stars one one edge of the field (so focus wasn't as good). This tilt issue seems to come and go, so is probably probably something a little loose somewhere that I've been trying to track down the last few observing nights

Each 8 minute sub was actually a live stack of 320 x one second exposures.

Suburban Astrophotography
Astrophotography with Dobson

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Status	Advanced failed
Started	...
Astrometry.net job	4557965
PixInsight job	E51WKXYQNNHMENV7AKBI0G6FNOI5U80A
PixInsight queue size	n/a
PixInsight stage	PLATE_SOLVING_IMAGE

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M13 - 2021 Season

M13 - 2021 Season

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M13 - 2021 Season

M13 - 2021 Season

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