M92 imaged in the boreal forest (Ian Dixon)

Celestial hemisphere: Northern · Constellation: Hercules (Her) · Contains: IC 4645 · IC 4648 · M 92 · NGC 6301 · NGC 6311 · NGC 6312 · NGC 6320 · NGC 6323 · NGC 6327 · NGC 6329 · NGC 6332 · NGC 6336 · NGC 6339 · NGC 6341 · NGC 6343 · NGC 6344 · NGC 6348 · NGC 6350 · NGC 6363

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M92 imaged in the boreal forest

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M92 imaged in the boreal forest

This is M92 in Hercules, taken with my portable gear.

Only 13 light subs, hope to get some extra data soon.

I enjoy studying globular clusters, due to their extreme nature - fascinating composition and incredibly ancient - beyond my feeble ability to grasp.

Sky Safari has much to say:

"M 92 is about 26,000 light years distant, only little farther away than its brighter apparent neighbor M 13; and it is intrinsically smaller and fainter. Its true diameter is about 100 light years; its absolute magnitude is -8.1, a luminosity of 150,000 Suns (60% that of M 13), and it may contain a mass of up to 330,000 Suns. M 92 is approaching us at 112 km/sec.

The stars of M 92 are exceptionally poor in iron and other elements heavier than hydrogen. This suggests that M 92 was formed before the gas and dust of our galaxy were enriched with heavy elements, and therefore that M 92 is exceptionally old, even for a globular cluster. M 92 may be a bit younger than M 13, or about 12 billion years old.

Only 16 variable stars have been discovered in this globular, 14 of which are of the RR Lyrae type. One is of the W Ursae Majoris type, and one of the very few eclipsing binaries found in a globular cluster. In these dense stellar agglomerates, close encounters occur frequently, so that binary systems will be disturbed, and eventually destroyed."

Final
Original
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B

Description: This is the first stretch as it was deposited from APP, the stacker I use. Some strange stripes artefact in the top right corner.

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Samyang 135 f/2
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Status	Advanced success
Started	...
Astrometry.net job	3520100
PixInsight job	JDPCQOZJHP2ZKH4TPYRNCNPPIYKASNXP
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	17h17m24s.97
RA (top/left)	17h06m20s.95
RA (top/right)	17h06m58s.67
RA (bottom/right)	17h27m24s.54
RA (bottom/left)	17h28m57s.21

Dec (center)	+43°06′52″.8
Dec (top/left)	+46°11′23″.9
Dec (top/right)	+40°02′01″.0
Dec (bottom/right)	+39°58′55″.0
Dec (bottom/left)	+46°07′59″.1

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M92 imaged in the boreal forest

M92 imaged in the boreal forest

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M92 imaged in the boreal forest

M92 imaged in the boreal forest

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