M45 (the Pleiades) (Anders Johannesson)

Celestial hemisphere: Northern · Constellation: Taurus (Tau) · Contains: 16 Tau · 17 Tau · 18 Tau · 19 q Tau · 20 Tau · 21 Tau · 22 Tau · 23 Tau · 24 Tau · 25 eta Tau · 26 Tau · 27 Tau · 28 Tau · Alcyone · Asterope · Atlas · Celaeno · Electra · IC 349 · LBN 770 · LBN 771 · LBN 772 · LBN 776 · Maia · Maia nebula · Merope · Merope nebula · NGC 1432 · NGC 1435 · Pleiades · And 12 more.

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M45 (the Pleiades)

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M45 (the Pleiades)

M45 (The Pleiades) is a 100 million years old, open star cluster that is just passing through some dust clouds that are beautifully illuminated by the bright stars of the cluster. The distance to M45 is 450 light years.

The image is a bit of an experiment. The total exposure time is only 9 minutes and the F-number of the telescope 5.8. The 8 um pixels of the CMOS sensor managed to pick-up quite some details anyway including the blue nebulosity. The ISO setting was 6400 to increase the signal-to-noise in the darkest parts of the image and to make possible to use a set of short exposure images instead of one long. No guiding was used, only the tracking of the mount.

"Nordish by nature"

Sony a7s images

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Status	Advanced success
Started	...
PixInsight job	LVA3427821HYB7TVXHICWO4TVVRD3N5V
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	03h47m55s.83
RA (top/left)	03h50m01s.27
RA (top/right)	03h41m09s.60
RA (bottom/right)	03h45m52s.95
RA (bottom/left)	03h54m42s.30

Dec (center)	+24°19′10″.2
Dec (top/left)	+25°47′20″.0
Dec (top/right)	+24°13′23″.0
Dec (bottom/right)	+22°50′42″.10
Dec (bottom/left)	+24°23′43″.10

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