M20 Trifid in SII, Ha, OIII, UV

[billhinge]

Hi

Went back to an old image and added more SII, Ha. plus a bit more alternate processing. I plan to try to get some more light blue if I can

In the image SII & Ha = Red, OIII = green, UV = blue

[DaveS]

Well, that's certainly not the usual take on the Triffid!

What filter did you use for the UV?

[billhinge]

Hi Dave

Thanks for asking. Much as I would like to claim I did this from my backgarden, the following gear was used: Astrodon UV photometric on a moonless night with a 20" Planewave  https://en.wikipedia.org/wiki/UBV_photometric_system

I'm accessing Australia remotely. I have some time booked to collect some RGB Blue as well, this week weather permitting so I will update as soon as I can

CCD:  FLI-PL6303E  CCD camera

QE: 68% Peak

Gain: 1.09

Full Well:  ~100,000e-  Non Anti Blooming Gate (NABG)

Dark Current:   <.005 e-/pixel/sec. @ -45º C

Pixel Size:  9um Square

Resolution:  0.81 arc-secs/pixel

Sensor:  Frontlit 

Cooling:  Set to -30ºC default 

Array:  3072 by 2048 (6.3 Megapixels) 

FOV:      27.8 x 41.6 arc-mins

Filters:

AstroDon Tru-Balance Gen 2 E series Luminance, Red, Green, Blue, 5nm Ha, 5nm SII, 5nm OIII, and AstroDon Johnson/Cousins UvBVRcIc

OTA: Planewave 20" (0.51m) CDK

Optical Design: Corrected Dall-Kirkham Astrograph

Aperture: 508mm

Focal Length:  2249 mm

F/Ratio: f/6.8

Guiding: Active Guiding Disabled 

Mount: Planewave Ascension 200HR

[tooth_dr]

Nice image, but slightly misleading in the first post, as most would assume it's done with your own equipment unless stated otherwise.

[billhinge]

Sorry I couldn't resist the urge 🙂

[DaveS]

Ah, that would explain the diffraction spikes. Since none of the 'scopes in your sig will give spikes I thought it might have been data from a previous 'scope.

Interesting use of UV photometric filter, wouldn't have thought of that, was thinking UV narrow band, and wondered at the lack of blue bloat, which would have been considerable with a 'frac.

[billhinge]

Added some normal blue, unfortunately I only managed to get 30 mins worth, I'll try to get more to complete the image