Einstein Ring - Horseshoe - gravitational lens - how far you can get with a 140 mm refractor (Marcel Noordman)

Einstein Ring - Horseshoe - gravitational lens - how far you can get with a 140 mm refractor

Description (from wikipedia)

The Cosmic Horseshoe is the nickname given to a gravitationally lensed system of two galaxies in the constellation Leo.The foreground galaxy lies directly in front in the line of sight to a more distant galaxy. Due to the passage of the light from the background galaxy through the gravity field of the foreground galaxy, the background galaxy's light is lensed by the warped spacetime environment of the foreground galaxy, thus giving the background galaxy a warped appearance. Unlike most lensed galaxies, the shape of the lensed light of this background galaxy appears shaped like a horseshoe.The foreground galaxy, LRG 3-757, is found to be extremely massive, with a mass a hundred times that of this galaxy. It is notable because it belongs to a rare class of galaxies called luminous red galaxies, which has an extremely luminous infrared emission.The system was discovered in 2007 by an international team of scientists using the comprehensive Sloan Digital Sky Survey and is greatly studied by the Hubble Space Telescope.

Personal note
Very exciting object to try our and surprising how far you can get with a (pretty good) 140 mm refractor and some hard core processing. I did not have enough time to finish the RGB, so that is in the plan for next year, but I did not want to wait with sharing my LUM data. I see several options to improve from here: more subs, sharper selection of the sharpest and dedicating a night with really good seeing. Lets see how far we can kick this ball!..

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	Basic failed
Started	...
Astrometry.net job	7861211
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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