NGC7822 Ha nebula with RGB stars (Duane Melvin)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep) · Contains: HD224826 · HD224918 · HD225009 · HD225010 · HD225136 · HD225216 · HD225271 · LBN 580 · LBN 581 · LBN 582 · LBN 583 · LBN 584 · LBN 586 · LBN 588 · LDN 1266 · LDN 1267 · LDN 1268 · LDN 1269 · LDN 1270 · LDN 1271 · LDN 1275 · NGC 7822 · Sh2-171

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NGC7822 Ha nebula with RGB stars

Powered byPixInsight

NGC7822 Ha nebula with RGB stars

Camera/exposures/filter/sensor details:

Total light 4.66 hours
RGB stars Ha nebula

NEBULA
37 subs, 240S each exposure 2.46 hours total
Antlia Hydrogen Alpha 2" 3nm filter in a single Starizona magnetic tray
CCD QHY294m Pro monochrome CMOS
Camera gain = 2300, cooled to -13C
Offset 6
Unlocked 48MP mode 2.314u square pixel size 4/3 size sensor 8340*5644 resolution 12 bits

STARS
44 subs, 180S each exposure @ gain = 101 cooled to +3C 2.2 hours total
Optolong LPRO Filter 2" in a single Starizona magnetic tray
G26 camera, color CMOS
Camera gain = 101 cooled to +3C
Offset 0
APS-C sensor,16 Bits, 3.76u square pixels at 26Mp resolution

Calibration Info:
10 darks 240Sec -13C nebula
10 darks 180Sec +3C stars
50 bias, 20 DF, 10 Flats for stars only

Main Telescope: (used for both nebula and stars subs)
Esprit 100ED triplet 100mm x 550mm APO refractor

Mount/Alignment/and Guiding:
EQ6R PRO mount
Orion 80 x 300 doublet with Starshoot TM camera ST4 direct to mount
PHD
Polemaster NCP RA axis exact alignment

SVBony wrap heaters

Image Processing:
Deep Sky Stacker
Pixinsight with StarSpikes 4 and StarXTerminator
Adobe Photoshop
Adobe Lightroom

The reduced background noise of the star image with Histogram Transformation before combining to Ha image using Pixel Math allows more pristine nebula detail!

Please note: The following tables are updated every 24 hours.

Distribution of astrophotographers

This table shows the number of distinct astrophotographers who have been assigned and IOTD/TP award compared to the total number of images awarded.
	Distinct awarded users	Total awarded images
Image of the day
Top picks
Top pick nominations

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
Landscape

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.

Submitted The date and time when you submitted this image for IOTD/TP consideration.	...
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.
Promotions by Submitters When 3 distinct Submitters promote the image, it moves on to the next stage of the process: evaluation for Top Pick status. This requirement, in addition to anonymization of images and distribution to only a subset of them, prevents biases and ensures that the best images are selected.
Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
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	6514684
PixInsight job	LW19R88LYQXB56HNFC2PO8ORSRP240QR
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	00h03m14s.917
RA (top/left)	00h02m36s.554
RA (top/right)	00h15m00s.479
RA (bottom/right)	00h03m58s.254
RA (bottom/left)	23h51m50s.730

Dec (center)	+67°09′55″.18
Dec (top/left)	+65°58′35″.68
Dec (top/right)	+67°31′37″.30
Dec (bottom/right)	+68°21′10″.77
Dec (bottom/left)	+66°45′02″.80

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Contribution Index (beta):

NGC7822 Ha nebula with RGB stars

NGC7822 Ha nebula with RGB stars

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NGC7822 Ha nebula with RGB stars

NGC7822 Ha nebula with RGB stars

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Description

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