Rosette

DJScotty (Scott) · #1 14-01-2015, 10:51 PM

Well, I guess clouds are a blessing in some respects. Enables one to revisit and reprocess images.

Details as below
Ha - 6 hours
All other channels approximately 1 hour each. (OIII, SII, R, G, B)
Full res here
http://www.astrobin.com/148265/
Lots more data needed... go away clouds, maybe tonight
Thanks for looking

DJ Scotty

RickS (Rick) · #2 15-01-2015, 03:59 PM

What scope are you using, Scott? The image looks pretty good but the stars are a little odd.

Cheers,
Rick.

DJScotty (Scott) · #3 15-01-2015, 04:05 PM

SW ED80 with 0.85 focal reducer.
NB data was 30 minute subs
RGB was 10 minute subs, taken from Dorrigo in NSW
Yes, they are a little bloated. I think that is a processing issue not the data itself. The original data looks pretty good.
Thanks for the kind words Rick

By the way will I see you at Moogerah Dam on Saturday night?

DJ Scotty

RickS (Rick) · #4 15-01-2015, 10:19 PM

I wondered if the scope was something like a VC200L which has thick spider vanes and can produce diamond shaped stars. Since it's a refractor I think you're right and it's something to do with the processing.

Alas, I'll be away from home for the new moon.

Cheers,
Rick.

DJScotty (Scott) · #5 15-01-2015, 10:42 PM

Ah, in regards to the diffraction spikes, I have put a plastic cap off our kitchen range hood over the end of the scope to get the spikes. I happen to like them. But it is only on the RGB data, not the NB.

Does that explain it?

DJScotty (Scott) · #6 15-01-2015, 11:10 PM

Now having had a think about your comment, I think the plastic is a bit thick. I have removed the cap and I am going to put some cotton over the dew cap tomorrow. Thanks Rick!

RickS (Rick) · #7 16-01-2015, 04:21 PM

That would explain it, Scott! Something thin like cotton would be a better choice for adding spikes. I believe there are ways to do it in software as well, but I've never tried it.

Cheers,
Rick.