Abell 21, the Medusa Nebula, HOO and SHO (AnaTa)

Celestial hemisphere: Northern · Constellation: Gemini (Gem) · Contains: PK205+14.1 · Sh2-274

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Abell 21, the Medusa Nebula, HOO and SHO

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Abell 21, the Medusa Nebula, HOO and SHO

Image of Abell 21, the Medusa Nebula, has SNR of 1.
Three panels are HOO (Panel A), SHO (Panel B) and RGB-annotation (Panel C)

Processing:
Dynamic Crop for R, G, B, Ha, Oiii, Sii
GraXpert for Ha, Oiii, Sii, R, G and B.
RGB is combined.
DBE for RGB
Color calibration for RGB
Blur and Noise XT for RGB, Oiii, Sii and Ha.
Star XT for RGB, Ha, Oiii and Sii
Standard linear HT stretching for RGB, Oiii, Sii, Ha and RGB-stars (moderate stretching)

Panels A and B:
SHO is created.
HOO is created.
Noise XT and then HT stretch again for both.
Mask with Lum.
LHE, Kernel radius 40 power 0.5, and 150 and 300, power 0.2
MMT sharp, 0.0.3-0.6 setting.
Hue adjustment for SHO and HOO images. This is toughest step.
Curve for saturation and brightness adjustment for SHO and HOO .
Curve for saturation adjustment for RGB stars.
Added RGB stars to the Nebulas.
Cropping only panel B.
Done

Panels C:
RGB is created.
Noise XT and then HT stretch again.
Star XT
Mask with Lum.
LHE, Kernel radius 40 and 150, power 0.2
MMT sharp
Curve for saturation and brightness adjustment for Nebulae.
Done.

Final
Original
B
C

Nebulas (Planetary)

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	Distinct awarded users	Total awarded images
Image of the day
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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
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Star trails
Northern lights
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	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
Traveller
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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	9305843
PixInsight job	HYGD54HLTRTUAQ4PQRNZNJKM4V9J7HSR
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	07h29m03s.170
RA (top/left)	07h28m16s.643
RA (top/right)	07h29m49s.797
RA (bottom/right)	07h29m49s.499
RA (bottom/left)	07h28m16s.151

Dec (center)	+13°14′49″.78
Dec (top/left)	+13°03′25″.72
Dec (top/right)	+13°03′31″.88
Dec (bottom/right)	+13°26′13″.25
Dec (bottom/left)	+13°26′07″.83

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Abell 21, the Medusa Nebula, HOO and SHO

Abell 21, the Medusa Nebula, HOO and SHO

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Image Index:

Contribution Index (beta):

Abell 21, the Medusa Nebula, HOO and SHO

Abell 21, the Medusa Nebula, HOO and SHO

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Description

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Sky plot

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