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Old 01-06-2021, 12:17 PM
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RCW 58 rarely imaged

I imaged this one a few years ago but the seeing wasn't that great.

I was at my dark site on the weekend and its not far from Eta Carina so a good target for the early evening.

Its mostly a Ha object but there is some very very faint O111 as well. I took about 50 minutes and it looks like it would take at least 3 hours to get a decent amount of data. Maybe another time.

I was pleased with the tracking accuracy of the AP1600.

Taken with a CDK17 and a QHY600m photographic camera with 5nm Astrodon filters.

Best viewed as the large size:

https://pbase.com/image/171682364/large regular size.

https://pbase.com/image/171682364/original large view (the best view).

Greg.
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  #2  
Old 01-06-2021, 01:52 PM
JA
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Wow Greg, Lovely Image
Looking at it I am really struck with a feeling of the vastness of space.

Best
JA
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  #3  
Old 01-06-2021, 01:52 PM
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multiweb (Marc)
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Fantastic shot Greg. Beautiful field and details. One for the cool wall.
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Old 01-06-2021, 02:36 PM
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Splendid image! I wonder what more time will bring? Thanks for showing this rare beast.
Mark
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  #5  
Old 01-06-2021, 04:28 PM
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Gee Greg, Very good, much detail on the original size. The star colour is nice and guiding looks to be perfect.
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  #6  
Old 01-06-2021, 04:48 PM
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Nice shot Greg. As you say, more exposure may be good, but you have certainly got some crisp detail there.
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  #7  
Old 01-06-2021, 04:53 PM
AnakChan (Sean)
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Great shot Greg. I've not heard of RCW 58 and your pix has definitely piqued my curiosity to research more about this. I can imagine this must be difficult capture and probably only under very dark skies.
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  #8  
Old 01-06-2021, 05:46 PM
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Quote:
Originally Posted by JA View Post
Wow Greg, Lovely Image
Looking at it I am really struck with a feeling of the vastness of space.

Best
JA
Thanks JA. Yes it looks very solitary out there by itself in that star field.

Greg.
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  #9  
Old 01-06-2021, 05:53 PM
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Quote:
Originally Posted by JA View Post
Wow Greg, Lovely Image
Looking at it I am really struck with a feeling of the vastness of space.

Best
JA
Thanks JA. Its fairly close to Eta Carina surprisingly but nothing else in that field except a lot of stars so it definitely gives the impression of vast space.

Quote:
Originally Posted by multiweb View Post
Fantastic shot Greg. Beautiful field and details. One for the cool wall.
Thanks Marc. I got the RGB before the moon came up and the Ha during the moon being up. The 5nm Ha filter is good when the object is not near the moon.

Quote:
Originally Posted by markas View Post
Splendid image! I wonder what more time will bring? Thanks for showing this rare beast.
Mark
The Ha is quite well exposed its the O111 which is super faint. So it would take probably 2-4 hours of O111 to show much. Its mostly just a ring around it in O111. I did take 40 mins of O111 but I couldn't get it to show through.

Quote:
Originally Posted by Bassnut View Post
Gee Greg, Very good, much detail on the original size. The star colour is nice and guiding looks to be perfect.
Thanks for that. Its a nice long focal length object.300 second exposures on the QHY600m 2x2 retained star colour and I was happy about that as CMOS can lose star colour easily being so sensitive. The guiding numbers at times seemed quite bad and I was surprised initially to see perfect round stars. It must be the PEC curve causing some larger guide errors but keeping it on track. Clear skies, no wind, conditions were ideal.


Quote:
Originally Posted by Geoff45 View Post
Nice shot Greg. As you say, more exposure may be good, but you have certainly got some crisp detail there.
More exposure on O111 would be the go as there is something there just very very faint. I have 40 minutes and I did manage to see what it was but just couldn't blend it in and show it. Too weak.

Quote:
Originally Posted by AnakChan View Post
Great shot Greg. I've not heard of RCW 58 and your pix has definitely piqued my curiosity to research more about this. I can imagine this must be difficult capture and probably only under very dark skies.
No, I think this is a target you could image from home as its a Ha object mainly. The RGB stars would need a decent dark night though.

Greg.
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  #10  
Old 01-06-2021, 06:20 PM
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strongmanmike (Michael)
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Eeexcellent shot Greg, quite beautiful really An intriguing object for sure, considered hitting it myself buuuut as you know best plans

How good are AP1600GTO's..? bloody brilliant, I love mine, no encoders, no PEC, no AO and polar aligned using polar scope

Oh....and nice to see something other than my wife's beloved Fighting Dragons

Mike
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  #11  
Old 01-06-2021, 09:16 PM
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Originally Posted by strongmanmike View Post
Eeexcellent shot Greg, quite beautiful really An intriguing object for sure, considered hitting it myself buuuut as you know best plans

How good are AP1600GTO's..? bloody brilliant, I love mine, no encoders, no PEC, no AO and polar aligned using polar scope

Oh....and nice to see something other than my wife's beloved Fighting Dragons

Mike
Thanks Mike. It was a good night and its nice to having everything playing nicely together. The AP1600 is a wonderful mount.

Greg.
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  #12  
Old 02-06-2021, 05:31 AM
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Quite interesting Greg,

but what I found more interesting was looking at all your other work!

Some serious dedication and skill
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  #13  
Old 02-06-2021, 08:12 AM
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Quite interesting Greg,

but what I found more interesting was looking at all your other work!

Some serious dedication and skill
Thanks Peter, most kind of you.

Greg.
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  #14  
Old 02-06-2021, 08:33 AM
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Very cool target & well found Greg,
(Is there an RCW reference atlas some where you can share?)

Thinking about the science behind this. It's my understanding that Wolf-Rayet stars are superheated O3 rich giants, creating nebulas from swirling superheated stellar winds, such as can be found in SH2-308, Thors' Helmet and NGC 2020 in the LMC.

So I'm curious as to why the O3 signal is so weak here.
Maybe that's a question for the Astrophysicists here to answer?

Well done.
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  #15  
Old 02-06-2021, 09:13 AM
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Quote:
Originally Posted by Andy01 View Post
Very cool target & well found Greg,
(Is there an RCW reference atlas some where you can share?)

Thinking about the science behind this. It's my understanding that Wolf-Rayet stars are superheated O3 rich giants, creating nebulas from swirling superheated stellar winds, such as can be found in SH2-308, Thors' Helmet and NGC 2020 in the LMC.

So I'm curious as to why the O3 signal is so weak here.
Maybe that's a question for the Astrophysicists here to answer?

Well done.
Thanks Andy. No I don't have an RCW catalogue unfortunately.

These Wolf Rayet objects though are quite interesting imaging targets.

Greg.
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  #16  
Old 02-06-2021, 09:55 AM
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Quote:
Originally Posted by gregbradley View Post
Thanks Andy. No I don't have an RCW catalogue unfortunately.

These Wolf Rayet objects though are quite interesting imaging targets.

Greg.
Hi Greg & Andy,

When I first saw Greg's image () I had a look for it in Stellarium to see where it lives, and although it didn't have an image of the gas cloud for it, it did recognise RCW 58 and show the central star (V385 Car) and pinpoint the location. I also randomly picked another "RCW something" and it also showed up, so Stellarium includes the RCW star catalog, in a fashion.

BTW the random RCW I checked was RCW 57. It came up as being listed under 3 names/catalogues, namely NGC3576, RCW 57 & Ced 113a, otherwise known as The Statue of Liberty Nebula

Best
JA
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  #17  
Old 02-06-2021, 10:29 AM
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Lovely image Greg, very delicate looking processing. Well done.
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  #18  
Old 02-06-2021, 07:05 PM
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Lovely image Greg, very delicate looking processing. Well done.
Thanks Paul.

Processing was deliberately minimal.

Greg.
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  #19  
Old 03-06-2021, 09:19 AM
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marc4darkskies (Marcus)
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Yes indeed, a beautiful and well processed image of a very interesting object Greg. I've never actually seen it before. Very nicely done
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  #20  
Old 03-06-2021, 05:46 PM
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Yes indeed, a beautiful and well processed image of a very interesting object Greg. I've never actually seen it before. Very nicely done
Thanks Marcus. Its an odd one and not too many examples of it.

Greg.
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