Hemisphere:  Northern  ·  Contains:  NGC 4236
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NGC 4236 Galaxy in Draco Bi-colour UV & NIR, 


            Mike Oates
NGC 4236 Galaxy in Draco Bi-colour UV & NIR
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NGC 4236 Galaxy in Draco Bi-colour UV & NIR

Technical card

Imaging telescopes or lenses: Takahashi FSQ-106 ED

Imaging cameras: Starlight Xpress SX-814 Trius Monochrome CCD

Mounts: Sky-Watcher EZ-EQ6 GT

Guiding cameras: Starlight-XPress Lodestar Autoguider

Software: Sequence Generator Pro  ·  Photoshop CS6  ·  PIXINSIGHT 1.8

Filters: Astrodon L-NIR  ·  Sloan u'  ·  Sloan i'

Accessory: Lakeside Astro Motor Focus System  ·  Starlight Xpress SX 'Maxi wheel'  ·  Starlight Instruments FTF3545B-A Focuser

Dates:Feb. 6, 2018

Astrodon L-NIR: 8x1200" bin 1x1
Astrodon L-NIR: 1x1800" bin 1x1
Astrodon L-NIR: 31x60" bin 4x4
Sloan i': 20x1200" bin 1x1
Sloan i': 4x600" bin 1x1
Sloan i': 4x600" bin 2x2
Sloan u': 18x1800" bin 1x1
Sloan u': 5x600" bin 2x2
Sloan u': 9x600" bin 4x4
Sloan u': 5x900" bin 4x4

Integration: 24.3 hours

Avg. Moon age: 21.04 days

Avg. Moon phase: 61.64%

Basic astrometry details

Astrometry.net job: 1974448

RA center: 12h 16' 41"

DEC center: +69° 25' 4"

Pixel scale: 1.435 arcsec/pixel

Orientation: 359.624 degrees

Field radius: 0.585 degrees

Resolution: 2024x2124

Locations: The Hills Observatory, Manchester, United Kingdom

Data source: Backyard


I have been experimenting with an Astrodon SLOAN U filter which passes Ultraviolet in the 320-385 nm wavelength. Long exposures are needed as well as lots of them as the amount of UV from Deepsky objects is rather low. I started with bin 4x4 images just to get some data to see what was there, but that meant I had a low resolution image. So further images at bin 2x2 were taken then even more at 1x1 to get more detail.

I have put this image together as a bi-colour image to highlight the UV against the Near Infrared to give the greatest contrast.

UV is given more from new stars, so this image is highlighting the areas in the galaxy where there is new star formation.

All the i’ and NIR-L subs were combined together and the resulting two images UV and NIR were made into a bi-colour image in PI with PixelMath;
Red = NIR
Green = (NIR*0.4)+(UV*0.6)
Blue = UV*1.1

I also have a full colour version of this galaxy here.



Mike Oates
License: None (All rights reserved)

Sky plot

Sky plot


NGC 4236 Galaxy in Draco Bi-colour UV & NIR, 


            Mike Oates