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Contains:  NGC 4631, NGC 4627
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NGC 4631 Whale and Pup Galaxies (using HyperStar), 





    
        

            Gilbert Ikezaki
NGC 4631 Whale and Pup Galaxies (using HyperStar)

NGC 4631 Whale and Pup Galaxies (using HyperStar)

Technical card

Resolution: 2588x1456

Dates:June 13, 2015

Frames:
One Shot Color: 32x120" (gain: 20.00) bin 1x1
One Shot Color: 16x240" (gain: 20.00) bin 1x1
One Shot Color: 8x480" (gain: 20.00) bin 1x1

Integration: 3.2 hours

Darks: ~8

Avg. Moon age: 26.29 days

Avg. Moon phase: 11.41%

Astrometry.net job: 1529341

RA center: 190.506 degrees

DEC center: 32.513 degrees

Pixel scale: 1.118 arcsec/pixel

Orientation: -170.845 degrees

Field radius: 0.461 degrees

Locations: SDAA Tierra Del Sol, Boulevard, California, United States

Data source: Traveller

Description

The OpticStar DS142-C uses a 1/2" (8mm diagonal) sensor which is some what small. This picture shows almost the whole frame with some of the edges cut off where dithered images did not overlap. The 50.9'x38.4' field of view with this small sensor using the HyperStar 0.21x reducer is about the same as what you would get with an APS-C DSLR and a 0.63x reducer on the same 8" SCT telescope. Because of the small 2.2"x2.2" pixel scale, the HyperStar exposure times are not much different from using a camera on the back end of the telescope (the uploaded photo was cropped and resized to fill a 1920x1080 pix screen). Because I'm using a one shot color camera on such a small object I used drizzle color synthesis to get as much resolution as possible, however, it does not have as much detail as using a monochrome camera with LRGB filters.

Comments

Author

AMultiverse
Gilbert Ikezaki
License: Attribution-NonCommercial-ShareAlike Creative Commons
730
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NGC 4631 Whale and Pup Galaxies (using HyperStar), 





    
        

            Gilbert Ikezaki