Pelican nebula SHO (Duane Melvin)

Celestial hemisphere: Northern · Constellation: Cygnus (Cyg) · Contains: 56 Cyg · 57 Cyg · B349 · HD198896 · HD198931 · HD199069 · HD199098 · HD199137 · HD199138 · HD199178 · HD199206 · HD199312 · HD199417 · HD199479 · IC 5070 · LBN 334 · LBN 338 · LBN 341 · LBN 343 · LBN 350 · LBN 353 · LBN 359 · LDN 933 · LDN 936 · NGC 6989 · NGC 6997 · Pelican Nebula · The star 56 Cyg · The star 57 Cyg

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Pelican nebula SHO

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Pelican nebula SHO

Date: 6-21-2022

Camera mode: 47MP
Exposures:
31x180Sec Antlia Ha 3nm 2-inch dia filter, gain 1811; ADU gain 1.8 of *unity
25x180Sec Antlia OIII 3nm 2-inch dia filter, gain 1811; ADU gain 1.8 of *unity
18x180Sec Antlia SII 3nm 2-inch dia filter, gain 1811; ADU gain 1.8 of *unity

*Example:
Unity definition means each ADU count = 1 photon = 1 electron in pixel well
Based on published curves for the QHY294m Pro, at 47MP
1811 gain gives ADU gain = 1.8 of unity or 180 ADU units for every 100 photons
14-bit ADU 2^(14) = 16384 levels, curve shows at gain 1811, ADU gain (system gain) = 1.8
I am still experimenting with this gain setpoint! 1600 to 1700 is commonly used for 11MP resolution. However, at 47MP, 2300 to 2600 seems like excessive gain producing very high system gains above 2. Easy to blow out stars etc.
Trying to find the sweet spot here!!

Main Camera:
QHY294m Pro 47MP mode -10C 4/3 sensor

Main Scope:
Esprit 100ED APO triplet refractor with supplied 40mm image circle flattener

Polemaster NCP alignment system
APT image sequence capture
PHD guiding on ST4 cable direct to EQ6R PRO mount
Orion refractor doublet guide scope 80mm x 320mm with Starshoot Autoguide TM camera

Deepsky Stacker
Photoshop

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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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Early dismissal Staff members have a lot of images to inspect on a daily basis, and they can dismiss images if they believe they don't meet the requirements for IOTD/TP selection. If an image is dismissed 5 times, it's removed from the process. This streamlines the process and ensures that any bias present in promotions could be overruled by other staff members.

Status	Advanced success
Started	...
Astrometry.net job	5898542
PixInsight job	5A222ZGR2RSIGSTKNKV5JE67NQ3DBCBD
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	20h51m02s.643
RA (top/left)	20h53m14s.187
RA (top/right)	20h44m24s.683
RA (bottom/right)	20h48m55s.901
RA (bottom/left)	20h57m43s.361

Dec (center)	+44°24′35″.41
Dec (top/left)	+45°31′53″.76
Dec (top/right)	+44°19′40″.43
Dec (bottom/right)	+43°17′06″.30
Dec (bottom/left)	+44°28′17″.38

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