M51 (Whirlpool Galaxy) and NGC5195; Canes Venatici (Thomas V. Davis)

Celestial hemisphere: Northern · Constellation: Canes Venatici (CVn) · Contains: IC 4263 · IC 4278 · M 51 · NGC 5169 · NGC 5173 · NGC 5194 · NGC 5195 · NGC 5198 · Whirlpool galaxy

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M51 (Whirlpool Galaxy) and NGC5195; Canes Venatici

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M51 (Whirlpool Galaxy) and NGC5195; Canes Venatici

M51 Whirlpool Galaxy and NGC5195; Canes Venatici

Astro Systeme Austria 12" f/3.5 astrograph

KAI-11000M; SBIG STL

Total Exposure: 7.5 hours (LRGB 120:90:120:120 minutes; unbinned)

March-April 2008; Inkom, ID

Comments: M51 was the first spiral structure ever observed by Lord Rosse in 1850 at a time when the true nature of galaxies was unknown. Its undeniable beauty explains its recognition as a true showpiece of the night sky. Probably less appreciated is that M51 represents a dramatic demonstration of an interacting pair of galaxies. As truly immense structures, galaxies are relatively large compared to the average distance between them. Most galaxies are separated by a distance of only 20 times their diameter compared to stars which are separated by 10 million times their diameter. As a result most galaxies are likely to encounter other galaxies at least a few times over their immense lifetimes. The encounters run the gamut from "major" mergers involving the collision of two comparable mass galaxies to more "minor" mergers involving the consumption of a small companion or satellite galaxy by the more dominant galaxy (Gendler).

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	Image of the day	Top pick	Top pick nominations	Total submitted
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Other
Unknown

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Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
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Status	Advanced success
Started	...
Astrometry.net job	2172075
PixInsight job	COJEGE9A3QV5UGO32G9BMJ1DCU4ZXMMN
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	13h29m55s.84
RA (top/left)	13h33m15s.97
RA (top/right)	13h33m23s.38
RA (bottom/right)	13h26m29s.48
RA (bottom/left)	13h26m34s.22

Dec (center)	+47°14′05″.10
Dec (top/left)	+46°25′22″.9
Dec (top/right)	+48°02′13″.3
Dec (bottom/right)	+48°02′24″.6
Dec (bottom/left)	+46°25′32″.9

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M51 (Whirlpool Galaxy) and NGC5195; Canes Venatici

M51 (Whirlpool Galaxy) and NGC5195; Canes Venatici

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M51 (Whirlpool Galaxy) and NGC5195; Canes Venatici

M51 (Whirlpool Galaxy) and NGC5195; Canes Venatici

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