Markarian's Chain (Tom Engwall)

Celestial hemisphere: Northern · Constellation: Virgo (Vir) · Contains: IC 3280 · IC 3303 · IC 3344 · IC 3355 · IC 3363 · IC 3382 · IC 3388 · IC 3393 · M 84 · M 86 · NGC 4374 · NGC 4387 · NGC 4388 · NGC 4402 · NGC 4406 · NGC 4407 · NGC 4413 · NGC 4425 · NGC 4435 · NGC 4438 · NGC 4458 · NGC 4461 · NGC 4473 · NGC 4477 · NGC 4479 · The Eyes

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Markarian's Chain

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Markarian's Chain

This is a two panel mosaic - my first attempt at a mosaic. It was fun to do but they take a long time, so not sure how often I will do this - a focal reducer is probably in my future. Voyager makes planning and capturing the mosaic panels super easy and processing in Pixinsight was pretty straight forward. Preprocessing was done in WBPP - using the keyword Pane to separate out the panels in post processing, so they registered properly. I tried both Star Alignment and Mosaic by Coordinates to register the integrated panels (by filter) to each other. Then Gradient Merger Mosaic to stich them together. I pefer Mosaic by Coordinates for the first step but both yielded equally good results. Again, both Voyager and Pixinsight made the process pretty painless, so despite the time involved, I will likely try this again. The exposure times by filter and panel are as follows:

Panel 1 Panel 2 Total Exposure
R 71 76 147 300
B 64 62 126 300
G 67 69 136 300
L 74 65 139 300

Total 276 272 548

Total Expoxure 45.7 hours

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	Distinct awarded users	Total awarded images
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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
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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
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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	5819084
PixInsight job	7V05X526RAKBHTMGEL6UZL7GONEQV1FB
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	12h27m30s.350
RA (top/left)	12h30m26s.574
RA (top/right)	12h24m15s.565
RA (bottom/right)	12h24m35s.259
RA (bottom/left)	12h30m44s.450

Dec (center)	+13°05′23″.27
Dec (top/left)	+13°44′48″.91
Dec (top/right)	+13°39′10″.77
Dec (bottom/right)	+12°25′45″.20
Dec (bottom/left)	+12°31′22″.100

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Markarian's Chain

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Markarian's Chain

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