Sunday, December 17, 2017

tried for the Cocoon (Halifax)

The Burke-Gaffney Observatory robot tried to image The Cocoon, another RASC Finest object, for me but it was very late in the evening. I received the luminance, red, and green data for NGC 4490 but then something happened. I suspect the sky between Herschel 400 galaxy in Canes Venatici brightened with the coming dawn. The small but interesting group also known as Arp 269.

RASC Finest galaxy The Cocoon in luminance

Luminance only, 60 seconds subexposures, 10 stacked shots. FITS Liberator, GIMP. North is up; east is left.

NGC 4485 is clearly tugging at the big spiral of 4490, warping and bending it.

Due east of the grand pair is the small round ball of lint, LEDA 2185016.

LEDA 2185640 (upper) and LEDA 2185391 (lower) appear to be satellite dwarf galaxies in the group, just west of 4485. Both are not round and diffuse. 2185640 is the brighter.

Near the top-left corner of the image is the oval fuzzy, LEDA 2187250.

LEDA 2186780, north-east of the Cocoon, is between GSC 03020-0480 and GSC 03020-1834.

First viewed on viewed and sketched on 5 May '13.


Reshot on 11 May '18.


Processed in colour on 4 Mar '21.


Wikipedia link: NGC 4490.

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