Markarian's Chain (Daniel.P)

Celestial hemisphere: Northern · Constellation: Virgo (Vir) · Contains: IC 3280 · IC 3303 · IC 3355 · IC 3363 · IC 3388 · M 84 · M 86 · NGC 4374 · NGC 4387 · NGC 4388 · NGC 4402 · NGC 4406 · NGC 4413 · NGC 4425 · NGC 4435 · NGC 4438 · The Eyes

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Markarian's Chain

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Markarian's Chain

This is my first "real" LRGB image using my mono camera.

I realize that to properly saturate the color in the LRGB mix, I had to work with non linear images.

The conditions were good with adark sky at 21.4, but the wind was very strong at 60 km/H ... which explained the poor fwhm of 3.4".

The processing was done in PI as follow (version original):

For each L, R ,G ,V channels :

- Flat Field Dark Substraction

- Flat Field Integration

- Images Calibration (Dark Substraction and FF correction)

- Cosmetic Correction

- Image Registration

- Image Integration

- DBE or ABE

- Deconvolution masked with 2.2 pixel psf

- Noise Reduction (Demure) with recommended variance

Then :

- Creating RGB image from RGB channels

- Color balance and Color saturation on stars of RGB

- Nonlinear Image Creation with L and RGB

- Extract R, g, b channels from RGB

- Created LRGB color image

- TGV denoise

- Remove flip (horizontal mirror)

Final image adjustments performed in Iphoto on Imac (levels adjustments, +10% color sat)

Original
B
Final
C

B

Description: RGB

Uploaded: ...

C

Description: L RGB

Uploaded: ...

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	2701925
PixInsight job	XTI0KGXJIGOBGDS4D8X1Y48AD2DJKPY6
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	12h26m11s.865
RA (top/left)	12h28m54s.859
RA (top/right)	12h24m09s.551
RA (bottom/right)	12h23m29s.186
RA (bottom/left)	12h28m13s.645

Dec (center)	+12°56′09″.70
Dec (top/left)	+13°15′47″.77
Dec (top/right)	+13°28′55″.69
Dec (bottom/right)	+12°36′25″.48
Dec (bottom/left)	+12°23′20″.45

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Markarian's Chain

Markarian's Chain

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Markarian's Chain

Markarian's Chain

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