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Old 18-04-2020, 07:25 PM
Startrek (Martin)
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NGC 4945 Tweezers Galaxy ( Golden Coin Galaxy )

This my second attempt in 2 years to capture this dim 9.5 magnitude galaxy in the constellation of Centaurus
Discovered by Scottish born James Dunlop at Parramatta Sydney in 1826 this barred spiral galaxy is often compared to our own Milky Way. Located about 11 million light years from earth
Captured last night between 8.30pm and 1.00am

8” f5 Bintel newt on an EQ6- R mount
Canon 600D stock with Baader coma corrector ( no filters )
Orion 60mm guide scope with helical focuser and ZWOASI120MM-S guide camera
ISO 800
62 x 3minute dithered guided subs
30 x darks
PHD2 guiding at 0.80 to 0.90 arc sec error
Medium dither every sub
Goto and tracking EQMOD, StellariumScope and Stellarium
Frame focus and capture BYEOS
Stacked in DSS
Processed in Startools V1.5 linear

*** I have been unable to name the tiny prominent galaxy in the top left corner
Any ideas ?

Comments welcome
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Old 18-04-2020, 08:20 PM
raymo
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Nice job Martin,-------it is NGC 4976.
raymo

Last edited by raymo; 19-04-2020 at 01:00 AM. Reason: more text
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  #3  
Old 18-04-2020, 10:39 PM
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muletopia (Chris)
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comparison

Martin,
Last year I had a go at this galaxy. AN 8 inch scope (Melon 210) with a stock standard
Canon 60Da at prime focus.
The attache pic is a stack of 24 60 second shots. Off axis guiding with PHD2, no dither

Darks but no flats,
Stacked with .Siril and processed with Nebulosity

I have Startools 1.5 now.I have not tried it on this stack, I will soon.
ST 1.5 seems to produce less intese results than ST 1.4 and for a couple of subjects i use Neb after ST.
But the wipe function in ST 1.5 is magic.
.
This game needs lots of patience.


Chris
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Old 19-04-2020, 11:51 AM
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ChrisV (Chris)
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Nice Martin.

You can also just make out ngc4945a under a star nearer the centre of the image. Get sky safari!
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Old 19-04-2020, 08:30 PM
Startrek (Martin)
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Raymo
Thanks for identifying it
Chris
Thanks , I use both Startools V1.4 and V1.5 and yes Wipe is a very powerful tool
ChrisV
I checked back on Stellarium and zoomed in and both those galaxies were there ( I get a bit lazy )
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Old 20-04-2020, 07:14 PM
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Sunfish (Ray)
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Great shot. Can I see another unidentifiable little fuzzy just to the right also.?
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Old 20-04-2020, 10:05 PM
Startrek (Martin)
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Thanks Ray
Yes there are quite a few faint fuzzies spread around interstellar space
I was surprised how well NGC 4976 ( top left ) came out especially using a DSLR running at 25degC
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