How dark a near central Total Lunar Eclipse can be? Hunting for below +14m galaxies near the lunar limb (TLE of May 15/16, 2022) (Alexandr Zaytsev)

How dark a near central Total Lunar Eclipse can be? Hunting for below +14m galaxies near the lunar limb (TLE of May 15/16, 2022)

Revision title: Annotated version of the original image indicating two easily detectible galaxies within 1 deg of the lunar limb

Using Telescope #5 (Officina Stellare Riccardi-Honders RH200 D = 200mm f/3, FLI Microline 16200) system of ChileScope observatory for trying to lift up relatively dim (> +14m, > +16m) galaxies in the vicinity of the position of the Moon around the Total Lunar Eclipse of May 15/16, 2022 [1]. The exposure sets used costed of two data sets:

Dataset [D1]: 26x 180sec RGB exposures of the area a week before the TLE (May 9, 2022) - also shown under [2].
Dataset [D2]: 24x 60sec R exposures taken during the period of +- 20 min of the maximum phase of the TLE - stacked in an attempt to lift the galaxies in the background in the radius of 1 deg. from the lunar limb.

[1] https://eclipse.gsfc.nasa.gov/LEplot/LEplot2001/LE2022May16T.pdf

[2] https://www.astrobin.com/oqaa0a/

The summary of image revisions:

The original revision and revision B are using the dataset [D2] with the HDR composition with a single R 60 sec exposure frame (also shown in revision E) to show the non-overexposed featured on the lunar limb.
The revisions C and D are with dataset [D1] added to enhance the background features just for reference.
Revision F shows a 3Dplot based on a raw image revision E without any intensity transformations applied.
Original revision and revisions B-E are all subframes of the original exposure frame and in original resolution.

Remarkably, two rather dim galaxies are detectible on the original revision and in revision B:

PGC 55251 (+14.4m)
PGC 872828 (+16.7m)

A single image taken from all all-sky camera of the observatory site near the maximum phase of the eclipse [3] to illustrate the observational confitions (the angular altitude of the Moon at that moment is about +77 deg.):

[3] https://www.obstech.org/environment/latest_image.png

B

Title: Annotated version of the original image indicating two easily detectible galaxies within 1 deg of the lunar limb

Uploaded: ...

C

Title: Deep sky background enhanced with the image taken a week before the eclipse

Description: 26x 180s RGB exposure (1h 18min integral) with the same Chilescope T5 instrument.

Uploaded: ...

D

Title: Annotated version of Revision C indicating the same two easily detectible galaxies within 1 deg of the lunar limb

Description: 26x 180s RGB exposure (1h 18min integral) with the same Chilescope T5 instrument.

Uploaded: ...

E

Title: A subframe of a single 60 sec exposure in R taken at the maximum phase of the eclipse prepared for photometric profiling

Uploaded: ...

F

Title: Photometric profile for the Revision E of the image produced by 3Dploit tool of PixInsight

Description: The image is analyzed as it came from camera, without any intensity transformation (single 60sec R exposure subframe taken near the maximum phase of the eclipse). One specific TYC star is identified with its visual magnitude for reference.

Uploaded: ...

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Status	Advanced success
Started	...
Astrometry.net job	6257772
PixInsight job	D0BFJMXBJ48KY6KAKRYDTCPQ3ZWW2BHO
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	15h28m21s.63
RA (top/left)	15h30m58s.62
RA (top/right)	15h30m58s.22
RA (bottom/right)	15h25m44s.71
RA (bottom/left)	15h25m43s.79

Dec (center)	-18°30′30″.1
Dec (top/left)	-19°08′48″.2
Dec (top/right)	-17°52′20″.7
Dec (bottom/right)	-17°52′26″.1
Dec (bottom/left)	-19°08′40″.7

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