Paramount MX: Guided vs unguided (Matt McBee)

Paramount MX: Guided vs unguided

This animated gif compares a stack of unguided images vs guided images. The mount is a Paramount MX. The imaging scope is a TOA-130 with reducer (f/5.76) producing a plate scale of 1.49" / pixel. The image here has been resampled to 200% to better show the star shapes.

Prior to data collection, a 192-point TPoint model was created, allowing TheSkyX to alter the tracking on the fly to compensate for polar alignment errors, flexure, and atmospheric refraction (via ProTrack). Also, periodic error correction (PEC) was applied, reducing the mount's native periodic error (4.6" peak to peak) to less than the seeing.

The images were acquired on the same night with the system alternating between guided and unguided exposures.

Processing including only a histogram stretch. I basically applied PixInsight's automatic screen transfer stretch to each image. Note that for a "real" process I would have stretched less aggressively and sought more contrast between the galaxy and the background.

Be sure to check the full resolution view.
http://www.astrobin.com/full/59145/0/?mod=none&real=#sthash.Mrt0MlWi.dpuf

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.

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