NGC 891 Silver Galaxy Outer Limits Galaxy (Matt Cole)

NGC 891 Silver Galaxy Outer Limits Galaxy

From the New General Catalogue, NGC 891 also known as Caldwell 23, the Silver Galaxy or the Outer Limits Galaxy is an unbarred spiral galaxy in the constellation Andromeda. The galaxy is approximately 30 million light years away from our galaxy and if we were able to view our galaxy from a distance and edge on like this one, we would look very similar. This galaxy is extremely dim at almost magnitude 10.0 and it barely showed up in the individual 180 second subs taken from my moderately light polluted backyard including some nights with lots of moon pollution.

Object: NGC 891, Silver Galaxy, Outer Limits Galaxy
Acquisition dates: August 31, September 1, 9, 16, 17, 18, 2023
Moon: Aug 31, Sept 1- 98%, Sept 9- 23%, Sept 16, 17, 18- no moon
Telescope: Astro- Tech 115 EDT w/AT field flattener
Mount: Sky Watcher HEQ5 Pro on a JMI Wheeley Bar
Main Camera: Canon EOS T7i Astro modified for HA, SII
Filter: NO FILTER
Guide Camera: ZWO ASI 290mm mini
Guide Scope: Sky Watcher EvoGuide 50ED
Capture: ZWO ASI Air Pro except for focused w/ Backyard EOS (BYEOS)
Dew Protection: Orion Dew Zapper Powered by a Celestron 12 volt 17 amp hour power tank
Subs- ISO 800, 300x 180 seconds= 15 Hours 9 minutes total integration time
Dithered every other shot by 2 pixels
Correction Frames: DARKS- 120, FLATS- 100, BIAS- 120
Stack: Deep Sky Stacker (DSS)
Edit: PixInsight BlurXTerminator NoiseXTerminator, StarXTerminator, EZ Processing Suite, Adobe Photoshop 2024
Shot From: My moderately light polluted backyard Bortle Scale: 7

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

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