Perseus galaxy group + a couple ARPs
Posted 08 January 2013 - 02:48 PM
29 x 5 minutes
(ripped from Wiki)...
"NGC 1275 (also known as Perseus A or Caldwell 24) is a type 1.5 Seyfert galaxy located around 237 million light-years away in the direction of the constellation Perseus. NGC 1275 corresponds to the radio galaxy Perseus A and is situated near the centre of the large Perseus Cluster of galaxies."
Perseus A (the largest elliptical) is an interesting object with gas or dust lane detail that is just slightly visible in my shot.
20 x 10 minutes
Arp 1 is located just north of Arp 285. I can get both in the fov but the night I shot 285 conditions were so poor I wanted to save this one for a better night. This is one that the guide star dictated the framing.
12 x 5 minutes
By the time I got to this one seeing and transparency had really gone to pot.
Posted 08 January 2013 - 03:12 PM
Posted 11 January 2013 - 02:25 PM
I really didn't expect this shot to amount to anything, I was kinda just screwing around. Last nights satelite ir image had me under a pretty small hole in the clouds so I didn't have much hope for completing a color image.
This is the first 'color' image with the new Atik 314L. I changed things up a bit, instead of a bunch of short exposures I tried a few long ones. I think the narrowband frames may be my first 30 minute exposures ever. This OAG might work out afterall.
M1 in LHOO
6 x 15 minutes L (cls filter)
2 x 30 minutes Ha
2 x 30 minutes O3
Posted 11 January 2013 - 03:30 PM
Posted 11 January 2013 - 03:46 PM
Posted 11 January 2013 - 04:22 PM
Terry, I usually don't even bother telling AstroBin to platesolve. I though it might be neat to see the C24 shot solved so I kept it as 'unmodified' as possible but no dice. No big deal but I am curious why I've never gotten it to work.
Posted 11 January 2013 - 04:58 PM
Posted 11 January 2013 - 05:29 PM
Very nice images and excellent guiding.
Posted 11 January 2013 - 05:49 PM
Posted 11 January 2013 - 06:33 PM
Eliminate the guide scope eh? I don't know if I'm ready to do that just yet. I agree with losing the weight. The main reason I went with the cheezy little 70mm refractor (with upgraded focuser) was to lighten the load on the mount. I originally had a Tak FS78 piggybacked, that thing weighs a ton.
Besides the occasions when a guide star isn't in the OAG the refractors wider fov helps with locating targets. I absolutely refuse to get into all that 'rotate' the OAG looking for stars. I'm getting spoiled by the clean chip of this 314L and reusing the same bias, bpm, and flats. Disturbing the camera means shooting new flats. If I can't shift the framing a bit to bring a guide star into view it's back to the guide scope I go.
Posted 11 January 2013 - 06:34 PM
Heh, not particularly. I ruffled some feathers expressing my opinion of that when it came up in a thread a while back. Not crazy about the 'comment' function either.
Do you not like the ratings function on Astrobin?
It's not that I'm anti-social or anything. I enjoy getting feedback and/or kudos as much as the next guy. I just prefer an image gallery to be that, a gallery. I think comments and conversation belong in forums like this one.
Posted 11 January 2013 - 06:58 PM
Posted 11 January 2013 - 09:47 PM
All that with a 7" Mak? Amazing, nice images and choices.
Posted 11 January 2013 - 10:44 PM
All that with a 7" Mak?
Hi Pete, thanks. I know right? And at F10+ to boot. Focal ratio schmocal ratio.
Posted 11 January 2013 - 11:17 PM
Those are some great images. I'd seen that you'd been using a 0.33x reducer for some of your images. I'm really impressed you got these at above f/10 and without massive exposure times. You're doing some really great things with that equipment and StarTools!
Posted 12 January 2013 - 12:50 AM
Yes, I have quite the collection of focal reducers. Both .33 and .63 Meades and .5 and .7 Antares and finally the AstroPhysics CCDT67. The Meades would vignette even the DSI unless they were screwed directly to the visual back and they exhibit field curvature because of the sct field flattening the Mak doesn't need. Out on the end of the microfocuser they were less than ideal.
The 2 inch Antares (which can be inserted into the microfocuser on the end of a 2" nosepiece) seemed to work ok but when I found the AP model, specifically designed for maks, I had to have it. I'm getting about .7 reduction with the AP spaced at 80mm from the chip. Field curvature is the smallest (possibly nonexistant) I've ever seen it.
Posted 12 January 2013 - 10:51 PM
By the way, StarTools has a HLVG-like feature in the Color module; just set 'Cap Green' to 'To Yellow' to cap the green channel to the the max value of the red or blue channels.
Posted 13 January 2013 - 12:22 AM
I am aware of the 'cap green' function and have used it. I am still pretty much bumbling my way through the nuances of StarTools in a 'trial and error' fashion. No doubt I am missing critical parameters and making mistakes that prevent even better results.
I haven't a clue of the technical details of either 'cap green' or HLVG but they do seem to work differently. For example the final version of my M1 shot...
When I open it in the color module and select 'cap green to yellow' nothing happens. If I select 'to brown' there's a dramatic reduction of the green but it becomes blue-ish purple. The HLVG plug-in at medium setting gave me what I was after.
Now I'm a full-on dummy when it comes to color balancing. I rely heavily on the 'auto balance' in Nebulosity 3 for initial adjustment. I haven't quite figured out how to reliably work the balancing function in the ST color module. That's on the to-do list along with the 'layer' module.
Posted 13 January 2013 - 09:35 AM
Posted 13 January 2013 - 02:55 PM
Posted 13 January 2013 - 09:38 PM