NGC 3750 Coplands Septet or ARP 320 or HCG57 (Riedl Rudolf)

Celestial hemisphere: Northern · Constellation: Leo (Leo) · Contains: Copeland's Septet · NGC 3745 · NGC 3746 · NGC 3748 · NGC 3750 · NGC 3751 · NGC 3753 · NGC 3754 · PGC 1660846 · PGC 1661085 · PGC 1662685 · PGC 169872 · PGC 36010

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NGC 3750 Coplands Septet or ARP 320 or HCG57

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NGC 3750 Coplands Septet or ARP 320 or HCG57

Coplands Septet is a group of Galaxies in a distance of 430 mio Lj. Even so that this should have 7 members there are in fact 8. The 8th is a small Galaxy in between the other members, which was too dark to be seen in the past. The name of this small one is PGC 36010 with a diameter of only 0,3 x 0,15 arcmin and a mag of 18.
Now the "real members" of the Septet: Sizes in arcmin. All of them are in the range of 15th and 16th mag.

NGC 3748   0,45 x 0,23
NGC 3746   0,80 x 0,40
NGC 3748   0,44 x 0,23
NGC 3750   0,90 x 0,70
NGC 3751   0,50 x 0,25
NGC 3753   0,86 x 0,65
NGC 3754   0,60 x 0,50

If you compare the sizes with the real sizes in the picture, than they do not really fit!

Looking at the "CLOSE UP" take into consideration that all Galaxies are much smaller than 1 arcmin!!

There are plenty of other really small galaxies in the FULL FIELD of VIEW which still represents a focal length of 2 meter! Have a look there as well.

This is a complete new processing of data from 2020!!

Original
Final
C

The OSC Club (One Shot Camera)
Austria Astrophotography
Schmidt-Cassegrain Telescope (SCT) Imagers
Rarely Imaged Small DSOs
DSLR/Mirrorless Imagers from the World

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
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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
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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
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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	Advanced success
Started	...
Astrometry.net job	9648398
PixInsight job	IFVJF52235OGJ327Q446LUL6B95V6ITB
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	11h37m49s.268
RA (top/left)	11h38m23s.790
RA (top/right)	11h37m22s.529
RA (bottom/right)	11h37m14s.830
RA (bottom/left)	11h38m15s.993

Dec (center)	+21°59′22″.65
Dec (top/left)	+22°03′12″.61
Dec (top/right)	+22°05′42″.10
Dec (bottom/right)	+21°55′32″.73
Dec (bottom/left)	+21°53′02″.87

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NGC 3750 Coplands Septet or ARP 320 or HCG57

NGC 3750 Coplands Septet or ARP 320 or HCG57

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NGC 3750 Coplands Septet or ARP 320 or HCG57

NGC 3750 Coplands Septet or ARP 320 or HCG57

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