IC 983

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IC 983 is the large, spiral galaxy in the center of this image. IC 982 is the smaller, elliptical galaxy to the lower left of IC 983. Together, these make up Arp 117. In Halton Arp's Atlas of Peculiar Galaxies, this is classified as "an elliptical close to and perturbing a spiral". Arp noted that the flattening of the spiral's Saturn-shaped core appears to be in a different plane than the arms. The small spiral, NGC 5409C, on the left side of this image is also an Arp galaxy. It is known as Arp 79, a spiral with a large, high surface-brightness companion on its arm. M 51, (Arp 85) is also a member of this group. Arp notes a small separation between two knots in the arm of Arp 79. This is just visible in this image.

Constellation: Bootes
Apparent Size: ~7' x 7'
Date: 21 & 24 february, 11 & 25 march, 10 & 20 april, 14 may 2007
Equipment: 12.5" RCOS RC @ f/9, ST10XME, AP1200
Exposure: LRGB: 3.1--2.5--2.4--2.6 hours, Astrodons unbinned