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.
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.
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
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
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
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
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
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.
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?
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.
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