Hemisphere:  Northern  ·  Constellation: Draco (Dra)  ·  Contains:  NGC 4236
Getting plate-solving status, please wait...
NGC 4236 Galaxy in Draco Bi-colour UV & NIR, 



    
        

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

NGC 4236 Galaxy in Draco Bi-colour UV & NIR

Getting plate-solving status, please wait...
NGC 4236 Galaxy in Draco Bi-colour UV & NIR, 



    
        

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

NGC 4236 Galaxy in Draco Bi-colour UV & NIR

Equipment

Imaging Telescopes Or Lenses
Takahashi FSQ-106 ED
Imaging Cameras
Starlight Xpress SX-814 Trius Monochrome CCD
Mounts
Sky-Watcher EZ-EQ6 GT
Filters
Astrodon L-NIR · Sloan u' · Sloan i'
Accessories
Lakeside Astro Motor Focus System · Starlight Xpress SX 'Maxi wheel' · Starlight Instruments FTF3545B-A Focuser
Software
Sequence Generator Pro · Photoshop CS6 · PIXINSIGHT 1.8
Guiding Cameras
Starlight-XPress Lodestar Autoguider

Acquisition details

Dates:
Feb. 6, 2018
Frames:
Astrodon L-NIR: 8x1200" (2h 40') bin 1x1
Astrodon L-NIR: 1x1800" (30') bin 1x1
Astrodon L-NIR: 31x60" (31') bin 4x4
Sloan i': 20x1200" (6h 40') bin 1x1
Sloan i': 4x600" (40') bin 1x1
Sloan i': 4x600" (40') bin 2x2
Sloan u': 18x1800" (9h) bin 1x1
Sloan u': 5x600" (50') bin 2x2
Sloan u': 9x600" (1h 30') bin 4x4
Sloan u': 5x900" (1h 15') bin 4x4
Integration:
24h 16'
Avg. Moon age:
21.04 days
Avg. Moon phase:
61.64%

Basic astrometry details

Astrometry.net job: 1974448

RA center: 12h16m41s.5

DEC center: +69°2504

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

Description

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 [url= https://www.astrobin.com/295628/]here[/url].

Comments

Sky plot

Sky plot

Histogram

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



    
        

            Mike Oates