M51 (Mark Manner)

M51

June 15, 16, 19, 2012.
17 x 600 sec L, bin 1, data from RCOS24 at Spot Observatory.
6 x 600 sec R, G & B, bin 2, data from CDK24 at MBA Observatory.

The revision images show a stretched luminance to show the outer star halo of the galaxy. Another revision is a comparison of a short exposure image with a modern 24" telescope to the famous image taken decades ago at Mt. Palomar with the 200″ Hale telescope, at the time the largest telescope in the world. The Hale telescope image was on a poster in my 1970 college dorm room! Images taken today by the Hale telescope would surpass today's amateur images, but the comparison shows how much technology has changed over the decades. Much of the change is a result of the use of high sensitivity/low noise CCD and CMOS cameras.

The Whirlpool Galaxy, also known as Messier 51, is a grand-design spiral galaxy that is interacting with the smaller galaxy (NGC 5195) visible behind its extended arm. It lies in the constellation Canes Venatici, and was discovered in 1773 by Charles Messier, who categorized it as a 'nebula'. Edwin Hubble later concluded that it was a distant galaxy and not a gaseous nebula inside the Milky Way, and it became the first galaxy to be classified as a spiral galaxy. It is approximately 25 million light-years away and 100,000 ly in diameter.

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Title: Comparison Mt. Palomar Poster

Description: This is a comparison of a short exposure image with a modern 24" telescope to the famous image taken decades ago at Mt. Palomar with the 200″ Hale telescope, at the time the largest telescope in the world. This image was on a poster in my 1970 college dorm room! Images taken today by the Hale telescope would surpass today's amateur images, but the comparison shows how much technology has changed over the decades. Much of the change is a result of the use of high sensitivity/low noise CCD and CMOS cameras.

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Title: Equipment

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Title: M51 Wide Field

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Title: M51 Luminance

Description: Luminance revised with PI tools in December 2023

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	Distinct awarded users	Total awarded images
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	Image of the day	Top pick	Top pick nominations	Total submitted
Deep sky
Solar system
Extremely wide field
Star trails
Northern lights
Noctilucent clouds
Landscape

	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
Traveller
Own remote observatory
Amateur hosting facility
Public amaeteur data
Professional, scientific grade data
Mix of multiple sources
Other
Unknown

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Status	Advanced success
Started	...
Astrometry.net job	8635509
PixInsight job	IY6U7HW5SOZM2MRXVL0DADST3SMRG5QC
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	13h29m50s.888
RA (top/left)	13h30m24s.992
RA (top/right)	13h28m40s.155
RA (bottom/right)	13h29m17s.360
RA (bottom/left)	13h31m01s.542

Dec (center)	+47°11′48″.50
Dec (top/left)	+47°22′24″.10
Dec (top/right)	+47°13′01″.68
Dec (bottom/right)	+47°01′11″.69
Dec (bottom/left)	+47°10′31″.86

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