12P/Pons-Brooks and M31 in perspective (Rian Rubingh)

12P/Pons-Brooks and M31 in perspective

12P/Pons-Brooks and M31 in perspective to houses and horizon
The comet was very low on the NW city horizon (see picture) so light pollution was a big problem (Bortle 6-7)
Due to the light pollution only a short part of the comet's long tail is resolved due to bright orange subs

Composition of a stack of the comet and M31 stitched to a foreground picture taken immediately at the end of the astrophotography session at the exact same location

Comet and M31
Pentax K1, Astrotracer
Samyang 135 mm f/2.0
115 lights, 10 sec, ISO 1600
30 darks
20 flats
30 dark offset / bias
Every 10 - 20 subs adjust the camera pointing
No filters, camera not modified

Foreground
Pentax K1
Samyang 135 mm f/2.0
1 light, 6 sec, ISO 400

SW use:
DSS:
- comet stack option
- stars (and thus M31) stack option

Photoshop workflow on stacked comet:
- Stretch
- Curve adjustment
- Stretch with alignment of RGB histograms on top of each other
- High frequency filter 2x, merge with "overlay"
- Camera Raw remove nebulosity
- Remove star trails with stamp tool
- Remove background

Photoshop workflow on stacked stars:
- Curve adjustment
- Camera Raw remove nebulosity
- High frequency filter 3x, merge with "overlay"
- Stretch with alignment of RGB histograms on top of each other
- Curve adjustment referenced on comet tail
- Remove background
- Enhance and brighten color of stars
- Blur and sharpen M31
- crop
- blend in comet

Photoshop workflow for composition:
- Photomerge "Collage" to stich foreground picture and background stack
- Align comet location
- Merge with "screen"

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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