NGC4565 Needle Galaxy (Chris Ashford)

Celestial hemisphere: Northern · Constellation: Coma Berenices (Com) · Contains: HD109718 · IC 3543 · IC 3546 · IC 3571 · IC 3582 · NGC 4562 · NGC 4565 · Needle Galaxy

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NGC4565 Needle Galaxy

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NGC4565 Needle Galaxy

This was an experiment: after carefully calculating my optimum sub-exposure lengths using the formula proposed by Robin Glover is his YouTube presentation: Choosing the right gain for Deep Sky imaging with CMOS cameras I decided to stop imaging for 120 or 180 seconds and use 30 and 60 second exposures. There is some margin for error in the calculation but using his method I calculated 24 seconds to be my optimum sub-exposure length with my ED127 scope, Optolong L-Pro filter, ASI294MC Pro at unity gain, and Keller Texas Backyard Light Pollution.

PixInsight's SubFrameSelector reported SNR weighting to be almost the same for 30s and 60s frames, with 60s frames being marginally better. I also integrated 64x60s frames and 128x30s frames as a comparison (same integration time) and found that the 30s integration looked much cleaner (less noise) than the 60s equivalent, which was interesting!

Optolong L-Pro filter

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Distribution of astrophotographers

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	Distinct awarded users	Total awarded images
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Distribution of subject types

This table shows the distribution of awards per subject type, compared to the popularity of images of that subject type.
	Image of the day	Top pick	Top pick nominations	Total submitted
Deep sky
Solar system
Extremely wide field
Star trails
Northern lights
Noctilucent clouds
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Distribution of data sources

This table shows the distribution of awards per data source, compared to the popularity of images acquired from that data source.
	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

The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

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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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Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
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Status	Advanced success
Started	...
Astrometry.net job	5802736
PixInsight job	B70SHYCI30V0ADV3V4UQ6INCH49HGP0A
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	12h36m22s.14
RA (top/left)	12h35m11s.83
RA (top/right)	12h35m09s.36
RA (bottom/right)	12h37m32s.70
RA (bottom/left)	12h37m35s.32

Dec (center)	+25°59′15″.2
Dec (top/left)	+26°20′42″.8
Dec (top/right)	+25°38′15″.8
Dec (bottom/right)	+25°37′46″.4
Dec (bottom/left)	+26°20′13″.2

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NGC4565 Needle Galaxy

NGC4565 Needle Galaxy

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NGC4565 Needle Galaxy

NGC4565 Needle Galaxy

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