Horsehead and Flame Nebulae (Don Alm)

Horsehead and Flame Nebulae

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ACQUISITION DETAILS
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Target: Horsehead Nebula (Barnard 33); Flame Nebula (NGC 2024); IC 434
Camera Gain: 100
Camera Temperature: -10 C
Exposure: 120 s
Focal Length: 128 mm
Aperture: f/4.0
Integration Time: 9h 16m
Total Frames: 278

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EQUIPMENT
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Camera: ZWO ASI533MC-Pro
Filter: ZWO UV/IR Cut
Lens: Rokinon 135mm f/2.0
Mount: ZWO AM5
Tripod: ZWO TC40

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POST-PROCESSING WORK FLOW
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Siril IC
1. Project Properties: Multi-Session w/ Equalize (CFA)
2. Files: Image; Dark (x60 @ 120s); Flat (x30 @ 3s); Dark-Flat (x30 @ 3s)
3. Image Properties
3a. Stack: Mean
3b. Rejection Type: Winsorized
3c. Weighing: WFWHM
3d. Normalisation: addscale

PixInsight
1. Process: DynamicCrop (remove borders of image that didn't contain stars on every subframe due to dithering)
2. Script: ImageSolver
3. Process: BlurXTerminator (version 2.0.0 - AI version 4 -- CorrectOnly)
4. Process: DynamicBackgroundExtractor (1st Pass: Division; 2nd Pass: Subtraction)
5. Process: SpectrophotometricColorCalibration (Defaults)
6. Process: BlurXTerminator (version 2.0.0 - AI version 4 - Defaults)
7. Process: StarXTerminator (Generate Star Image & Unscreen Stars checked)
8. Process: GeneralizedHyperbolicStretch (several iterations of stretches on starless image to highlight nebulae)
9. Process: GeneralizedHyperbolicStretch (1 iteration of stretches on star mask image)
10. Process: PixelMath (combine stretched starless image & star mask) -- Expression: ~((~starless)*(~star_mask))
11. Process: NoiseX (Denoise: 0.60; Detail: 0.15)
12. Process: ICCProfileTransformation (Convert to profile = Adobe RGB (1998))

GIMP
1. Levels (adjust black level to make background sky darker - Level 10.0)
2. Saturation (Scale: 1.75)
3. Crop to 2800x2200 for printing

Nebulae

	Distinct awarded users	Total awarded images
Image of the day
Top picks
Top pick nominations

	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

	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

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	9089546
PixInsight job	O79S971VRKSSZQQOJ9ZWR7Z4BQ4888DO
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	05h39m00s.30
RA (top/left)	05h34m39s.13
RA (top/right)	05h29m16s.20
RA (bottom/right)	05h43m22s.94
RA (bottom/left)	05h48m43s.21

Dec (center)	-02°20′12″.3
Dec (top/left)	+00°25′42″.5
Dec (top/right)	-04°02′48″.6
Dec (bottom/right)	-05°06′14″.4
Dec (bottom/left)	-00°37′21″.4

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