Coma Cluster (Abel 1656) in LRGB (Robert H. Kutner)

Celestial hemisphere: Northern · Constellation: Coma Berenices (Com) · Contains: IC 3943 · IC 3946 · IC 3947 · IC 3949 · IC 3955 · IC 3957 · IC 3959 · IC 3960 · IC 3963 · IC 3968 · IC 3973 · IC 3976 · IC 3998 · IC 4011 · IC 4012 · IC 4021 · IC 4026 · IC 4030 · IC 4033 · IC 4040 · IC 4041 · IC 4042 · IC 4044 · IC 4045 · IC 4051 · IC 4106 · IC 4111 · IC 4133 · IC 839 · NGC 4816 · And 41 more.

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Coma Cluster (Abel 1656) in LRGB

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Coma Cluster (Abel 1656) in LRGB

Dithered during acquisition. Blink / Subframe Select, Calibrated (60 Dark, 60 Flat, 100 Bias), Star Aligned all images with PixInsight, about 90% were useable. Used Image Integration with drizzle then Dynamic Cropped.

For 60s R, G, & B channels: ABE, EZDeNoise, STF Stretch, and channel combined using LRGB comb.

For 300s Lum: ABE, TGVd, MLT, Mask Stretched, HDR, DSE, and MMT before LRGB Combined with 60s RGB image.

For 10s stars: LRGB Channel Comb. RGB Star Image was masked with an inverted Star Mask and replaced with LRGB image using Pixel Math.

For 300/60s stars: LRGB Channel Comb. RGB Star Image was masked with an inverted Star Mask and replaced with LRGB image using Pixel Math.

Final combined image was Curves modified w/ & w/o masks. Moved to Photoshop to further adjust saturation, contrast, and additional noise reduction. Returned to PI for Resample and Annotation.

Cloudy Nights

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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	5700601
PixInsight job	Y22LZY20TD1GFD7ABN6LK3C9CX7L9N0U
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	13h00m00s.32
RA (top/left)	12h55m16s.100
RA (top/right)	13h03m29s.10
RA (bottom/right)	13h04m44s.14
RA (bottom/left)	12h56m27s.67

Dec (center)	+27°50′51″.9
Dec (top/left)	+27°35′04″.2
Dec (top/right)	+27°05′57″.8
Dec (bottom/right)	+28°06′10″.2
Dec (bottom/left)	+28°35′32″.3

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Coma Cluster (Abel 1656) in LRGB

Coma Cluster (Abel 1656) in LRGB

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Image Index:

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Coma Cluster (Abel 1656) in LRGB

Coma Cluster (Abel 1656) in LRGB

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Sky plot

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