Hemisphere:  Northern  ·  Constellation: Canes Venatici (CVn)  ·  Contains:  NGC 4485  ·  NGC 4490
NGC 4490, 


            Tom Harrison
NGC 4490
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Technical card

Imaging telescopes or lenses: RCOS 12.5" Truss

Imaging cameras: SBIG STL6303e

Mounts: Paramount ME

Guiding telescopes or lenses: RCOS 12.5" Truss

Guiding cameras: SBIG STL6303e

Software: Maxim DL

Filters: Astrodon Tru-Balance Generation 2

Accessory: PIR  ·  Off-Axis Guider Homeyer

Dates:May 24, 2011

Frames: 112x600" (18h 40')

Integration: 18h 40'

Avg. Moon age: 21.88 days

Avg. Moon phase: 52.80%

Basic astrometry details

Astrometry.net job: 116838

RA center: 12h30m29s.8

DEC center: +41°3950

Pixel scale: 0.647 arcsec/pixel

Orientation: 174.490 degrees

Field radius: 0.242 degrees

Resolution: 620x498

Locations: Texas, None; Fort Davis, None


NGC4490 and its companion galaxy NGC4485 are between 40-50 Million Light-Years distant toward the Constellation Canes Venatici. NGC4490 is also known as the Cocoon Galaxy. Stars trail between the two galaxies in a 24,000 Light-Year gap as they now pull away from each other during their orbital dance toward merger. The gravitational interaction has created a large number of star-forming regions with pink HII areas and blue stars regions lighting the entire length of both. The pair is being studied by astronomers through computer models to determine the mechanics of interacting galaxy pairs. A supernova was noted in NGC4490 in 2008, and previously in 1982. NGC4490 shows characteristics of a barred spiral galaxy, while NGC4485 is classified as an irregular galaxy.

Object: NGC4490 and NGC4485

Distance: 40-50 Million Light-Years

Magnitude: 9.8

Date: May 2011

Place: Fort Davis, TX

Exposure Details: LRGB:550:150:180:240 unbinned

Processing: MaxIm DL, CCDInspector, CCDStack, Photoshop CS3

Optics: 12.5" RCOS Truss

Focal Length: 2808 @ f9

Mount: Paramount ME Robotic

Camera: SBIG STL6303E

Focuser: RCOS

Guiding: Off-Axis using SBIG Guide Camera

Filters: Tru-Balance Gen II 2" L


Sky plot

Sky plot


NGC 4490, 


            Tom Harrison