NGC 2174. the Monkey Head Nebula, SHO and RGB (AnaTa)

Celestial hemisphere: Northern · Constellation: Orion (Ori) · Contains: HD252924 · HD42088 · HD42400 · IC 2159 · LBN 854 · Monkey Head Nebula · NGC 2174 · NGC 2175 · Sh2-252

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NGC 2174. the Monkey Head Nebula, SHO and RGB

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NGC 2174. the Monkey Head Nebula, SHO and RGB

NGC2174 RGB was used for annotation and captured during about 30 min. Main image is SHO and has combined HSO SNR of about 200.
Panel A: SHO
Panel B: RGB annotation

Processing:
R, G, B, Ha, Oiii and Sii were cropped.
GraXpert was used to remove background.
RGB are combined.
DBE again for Ha and RGB.
Color Colib for RGB
Blur and Noise XT for Ha, O3, S2 and RGB
Star XT for RGB. RGB stars were kept.
Manual stretching (with HT) for Ha, O3, S2, RGB (no stars), and RGB-stars (two different stretching: dimmer and brighter stars).

1. Processing (panels B)
RGB no stars were masked by Lum.
Local Histogram Equalization: Kernel radius of 40 and 150
Multiscale-median transform for sharpness; strong 0.4-0.5 setting.
Curves: brightness is manipulated
Mask off.
Added saturated RGB stars (brighter star version).
Annotation

1. Processing (panel A)
Combined SHO as R-G-B
Star XT
Noise XT
Stretched again.
Played with Hue-Saturation until final image. I almost always use this approach for narrow-band images.
Lum for SHO was used as mask.
Local Histogram Equalization: Kernel radius of 40, 150 and then 300 (histogram resolution is 10-bit!)
Multiscale-median transform for sharpness; strong 0.4 setting.
Curves: saturation and brightness are manipulated
Blue and red were separately manipulating using "blue mask" and "red mask" scripts.
Mask off.
Added RGB stars (dimmer stars).
Done

Original
Final
B

Nebulas (Emission)

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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.
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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.
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	8780116
PixInsight job	MRD1QTNR0LPS5YZJ6EBH00191G8BYFV1
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	06h09m52s.65
RA (top/left)	06h07m21s.33
RA (top/right)	06h12m20s.19
RA (bottom/right)	06h12m25s.50
RA (bottom/left)	06h07m24s.24

Dec (center)	+20°36′55″.5
Dec (top/left)	+20°02′12″.3
Dec (top/right)	+20°01′19″.0
Dec (bottom/right)	+21°11′29″.7
Dec (bottom/left)	+21°12′23″.8

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NGC 2174. the Monkey Head Nebula, SHO and RGB

NGC 2174. the Monkey Head Nebula, SHO and RGB

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Image Index:

Contribution Index (beta):

NGC 2174. the Monkey Head Nebula, SHO and RGB

NGC 2174. the Monkey Head Nebula, SHO and RGB

Equipment

Acquisition details

Description

Comments

Revisions

Sky plot

Histogram

In these collections

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