Markarian Mosaic (Norman Hey)

Celestial hemisphere: Northern · Constellation: Virgo (Vir) · Contains: IC 3311 · M 84 · M 86 · M 87 · NGC 4374 · NGC 4388 · NGC 4402 · NGC 4406 · NGC 4407 · NGC 4425 · NGC 4435 · NGC 4438 · NGC 4461 · NGC 4473 · NGC 4477 · NGC 4486 · Virgo Galaxy

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Markarian Mosaic

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Markarian Mosaic

My first attempt at Markarian's Chain was with a focal reducer/field flattener that I could never get tuned properly. So when I got back in the game with a repaired objective (? broken oil seal? pinched optics due to cell contraction in extreme cold? both? --no explanation, just "fixed it") I thought this would make a good test target project, both as a 2 panel mosaic and to see what a different flattener might do. I haven't rigorously tuned this one either, but it definitely helps in the corners. The plan is a more "scientific" approach to adjusting backfocus--saving it for moonlit nights, assuming we get clear skies.

This is one panel of 69 frames and one of 57, each 3 minutes in Bortle 6-7 skies, over three nights--I have a limited imaging window at this target's location. I used MosaicbyCoordinates and PhotometricMosaic basically at defaults. I did have to adjust the join position to avoid artefacts right in the Eyes. Aside from the obvious flaws in my acquisition and processing in general, I can't say I see anything horrid attributable to the the mosaic process per se. If anyone does, please let me know! If you do look closely (and ignore the problems!) you can see the jet in M87--amazing! Without trying exposures that might optimize its visibility. If you have suggestions for this, let me know!

I am pretty happy with this, but then I just saw a 3 hour RASA 8 shot with a 2600--impressive field of view and detail! I won't be running out to get one, though--I think this stands up pretty well, given the differences in sky conditions and overall rig configuration and OSC vs mono (for the image I was seeing).

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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	Basic success
Started	...
Astrometry.net job	4396867
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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Markarian Mosaic

Markarian Mosaic

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Markarian Mosaic

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