File:AM 0417-391 Potw2247a.jpg

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English: The galaxy merger Arp-Madore 417-391 steals the spotlight in this image from the NASA/ESA Hubble Space Telescope. The Arp-Madore catalogue is a collection of particularly peculiar galaxies spread throughout the southern sky, and includes a collection of subtly interacting galaxies as well as more spectacular colliding galaxies. Arp-Madore 417-391, which lies around 670 million light-years away in the constellation Eridanus in the southern celestial hemisphere, is one such galactic collision. The two galaxies have been distorted by gravity and twisted into a colossal ring, leaving the cores of the two galaxies nestled side by side. Hubble used its Advanced Camera for Surveys (ACS) to capture this scene— the instrument is optimised to hunt for galaxies and galaxy clusters in the ancient Universe. Hubble’s ACS has been contributing to scientific discovery for 20 years, and throughout its lifetime it has been involved in everything from mapping the distribution of dark matter to studying the evolution of galaxy clusters. This image comes from a selection of Hubble observations designed to create a list of intriguing targets for follow-up observations with the NASA/ESA/CSA James Webb Space Telescope, as well as other ground-based telescopes. Astronomers chose a list of previously unobservedgalaxies for Hubble to inspect between other scheduled observations. Over time, this lets astronomers build up a menagerie of interesting galaxies while using Hubble’s limited observing time as fully as possible. [Image description: Two galaxies right of centre form a ring shape. The ring is narrow and blue, and the cores of the two galaxies form a bulge on the ring’s side. A bright, orange star lies above the ring. Two smaller spiral galaxies appear left of centre, as well as a few stars. The background is black and speckled with very small stars and galaxies.] Links Video of Hubble Hunts an Unusual Galaxy 
Position (RA):	4 19 42.04
Position (Dec):	-39° 11' 5.15"
Field of view:	3.20 x 3.02 arcminutes
Orientation:	North is 54.7° right of vertical

Colours & filters
Band	Wavelength	Telescope
Optical G	474 nm	Víctor M. Blanco 4-meter Telescope DECam 
Optical R	644 nm	Víctor M. Blanco 4-meter Telescope DECam
Optical Z	919 nm	Víctor M. Blanco 4-meter Telescope DECam
Optical V 606 nm Hubble Space Telescope ACS
Date
Source https://esahubble.org/images/potw2247a/
Author ESA/Hubble & NASA, Dark Energy Survey/DOE/FNAL/DECam/CTIO/NOIRLab/NSF/AURA, J. Dalcanton
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This file is licensed under the Creative Commons Attribution 4.0 International license.
Attribution: Credit:  ESA/Hubble & NASA, J. Dalcanton, Dark Energy Survey/DOE/FNAL/DECam/CTIO/NOIRLab/NSF/AURA
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