Abell 2218 - Distant Galaxy Cluster in Draco with faint Gravitational lenses - LRGB (Daniel.P)

Celestial hemisphere: Northern · Constellation: Draco (Dra)

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Abell 2218 - Distant Galaxy Cluster in Draco with faint Gravitational lenses - LRGB

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Abell 2218 - Distant Galaxy Cluster in Draco with faint Gravitational lenses - LRGB

This image was taken during the nights of the 1, 2, 3, 4 ,5, 6 and 7th of July 2021, using :
- the 12" SCT for the LUM channel : 267 x 300 s
- and the 115 mm APO for the RGB channels : 240 R - 151 G - 176 B x 120 s.

The APO was operated in "slave mode" using a second instance of SGP.
A small routine allowed the slave APO to initiate exposure only during the 5 mn exposure of the master SGP instance.

Gravitational Lenses can be seen even if very faint. These can be more easily seen on the enlarged version B or with animated gif :
- version D : comparison with Hubble
- version E : with arrow indications

The color calibration was performed using Photometric Color Calibration in PI, using average spiral galaxy as reference white. It is interesting to note that the cluster appears in yellow color maybe due to the red shit of the cluster itself : z=0.17 for a distance of 2.3 billion light-years.

Final
Original
B
D
E

B

Description: ZOOMED

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D

Description: Hubble comparison

Uploaded: ...

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Status	Advanced success
Started	...
Astrometry.net job	4807020
PixInsight job	UD0M7G1AN1ARBAAEFX59S0OMPCLP4RUB
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	16h35m56s.493
RA (top/left)	16h38m47s.595
RA (top/right)	16h33m00s.796
RA (bottom/right)	16h33m08s.527
RA (bottom/left)	16h38m49s.557

Dec (center)	+66°12′54″.14
Dec (top/left)	+66°25′46″.63
Dec (top/right)	+66°25′09″.79
Dec (bottom/right)	+65°59′49″.71
Dec (bottom/left)	+66°00′24″.30

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Abell 2218 - Distant Galaxy Cluster in Draco with faint Gravitational lenses - LRGB

Abell 2218 - Distant Galaxy Cluster in Draco with faint Gravitational lenses - LRGB

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Abell 2218 - Distant Galaxy Cluster in Draco with faint Gravitational lenses - LRGB

Abell 2218 - Distant Galaxy Cluster in Draco with faint Gravitational lenses - LRGB

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