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Contains:  NGC 4485, NGC 4490
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NGC4490 Cocoon Galaxy, 


            Jerry Macon
NGC4490 Cocoon Galaxy
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NGC4490 Cocoon Galaxy

Technical card

Dates:Jan. 26, 2019Jan. 27, 2019

Astrodon Gen 2 L 36mm: 140x100" (gain: 99.00) -15C bin 1x1
Astrodon Gen 2 RGB 36mm: 67x200" (gain: 99.00) -20C bin 1x1

Integration: 7.6 hours

Avg. Moon age: 21.23 days

Avg. Moon phase: 59.67%

Bortle Dark-Sky Scale: 4.00

Temperature: -5.00

Basic astrometry details job: 2511319

RA center: 12h 30' 34"

DEC center: +41° 39' 18"

Pixel scale: 0.701 arcsec/pixel

Orientation: 357.659 degrees

Field radius: 0.293 degrees

Resolution: 2408x1812

Locations: Dark Star Observatory, Taos, New Mexico, United States

Data source: Own remote observatory

Remote source: Non-commercial independent facility


Imaged on nights of 2019-1-26, 2019-1-27.
The RGB were taken on the AG12+ASI1600MM at .70 asec/pix, the L on TV127is+ASI183MM at .75 asec/pix. Using L from the TV NP127is refractor effectively eliminates the spikes from the AG12.

NGC 4490, also known as the Cocoon Galaxy, is a barred spiral galaxy in the constellation Canes Venatici. It lies at a distance of 25 million light years from Earth. It interacts with its smaller companion NGC 4485 and as a result is a starburst galaxy. NGC 4490 and NGC 4485 are collectively known in the Atlas of Peculiar Galaxies as Arp 269. NGC 4490 is located 3/4° northwest of beta Canum Venaticorum and with apparent visual magnitude 9.8, can be observed with 15x100 binoculars. It is a member of Herschel 400 Catalogue. It belongs in Canes Venatici galaxy cloud II.

It was discovered by William Herschel in 1788. Two supernovae have been observed in NGC 4490, SN 1982F, and type II-P SN 2008ax, with peak magnitude 16.1.



Jerry Macon
License: Attribution Creative Commons

Sky plot

Sky plot


NGC4490 Cocoon Galaxy, 


            Jerry Macon