Hemisphere:  Northern  ·  Constellation: Draco (Dra)
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Gravitational lensing in Abell 2218, 


            Vlad Onoprienko
Gravitational lensing in Abell 2218
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Gravitational lensing in Abell 2218

Technical card

Imaging telescopes or lenses: 9" MK "Santel"

Imaging cameras: QSI 640i

Mounts: Sky-Watcher EQ8

Filters: Baader L  ·  Baader RGB Filters

Accessory: Starlight Xpress Off Axis Guider  ·  Starlight Xpress Lodestar  ·  Starlight Xpress Fliter Wheel

Dates:April 16, 2018April 25, 2019April 27, 2019May 3, 2019May 27, 2019May 29, 2019May 30, 2019June 4, 2019June 6, 2019June 25, 2019June 27, 2019July 2, 2019July 6, 2019

Baader L: 57x1800" bin 1x1
Baader RGB Filters: 87x600" bin 2x2

Integration: 43.0 hours

Avg. Moon age: 17.64 days

Avg. Moon phase: 23.45%

Bortle Dark-Sky Scale: 2.82

Mean SQM: 21.65

Basic astrometry details

Astrometry.net job: 2810723

RA center: 16h 35' 57"

DEC center: +66° 13' 4"

Pixel scale: 0.512 arcsec/pixel

Orientation: 0.861 degrees

Field radius: 0.197 degrees

Resolution: 1957x1963

Data source: Traveller


Abell 2218 galactic cluster in the constellation Dragon, is about 2.1 billion light years from Earth (cosmological redshift z = 0.17).
The photo shows a set of small yellowish galaxies. For a particular identification of details is very helpful here is this work:

No. 289. The brightest and most easily detectable arc. z = 1.03. Visible even on some individual subs.
No. 359 /328. The first is a brighter and more easily detectable red arc, the second is a weaker counter-image of the first arc 359. z = 0.7. The complex itself (plus no. 337/389 visible in the HST image), according to scientists, is an image of a background spheroidal galaxy.
No. 384 /468. The first is still bright, the second is very weak counter-image of the first arc. z = 2.8. The value of the redshift is such that the object will move away from us at a speed of 261,000 km/s, which is already 87 % of the speed of light.
No. 444. Much weaker than its neighbour arc 384. z = 1.1. Magnitude in red 23m.



  • Final
    Gravitational lensing in Abell 2218, 


            Vlad Onoprienko
    Gravitational lensing in Abell 2218, 


            Vlad Onoprienko

Sky plot

Sky plot


Gravitational lensing in Abell 2218, 


            Vlad Onoprienko