Jump to content

SkySurveyBanner.jpg.21855908fce40597655603b6c9af720d.jpg

Mysterious bluish structures in Cassiopeia Part 3: Oiii with Hyperstar


Recommended Posts

Last night I got my first proper light with my EdgeHD11 with Hyperstar v4, which compared to my RASA8s can fit in a filter drawer so I can easily change filters (and of course it has twice the light grasp of a RASA8). I put in a Baader 4 nm Oiii f/2 filter and aimed at the mysterious blue object I discovered in Cassiopeia about a month ago (https://www.astrobin.com/cnvp2s/). I then imaged it with RASA8 and an IDAS NBZ dual-band filter (Ha+Oiii) so it was likely a Oiii emitting object, but that filter also let some blue reflection nebulosity through (especially with a light bucket as a RASA). So with the Hyperstar I wanted to make sure it was Oiii the object was emitting. Unforunately I only got 6 x 5 min before clouds moved in. However, for this 11" f/1.9 scope that was enough to reveal a clear Oiii signal, although a bit noisy.

When I posted my RASA image Marcel Drechsler enlightened me that the object was registered in Simbad as  GSH 122+02-77 "Interstellar Shell" (http://simbad.cds.unistra.fr/simbad/sim-basic?Ident=GSH+122%2B02-77&submit=SIMBAD+search) with no further info and it has apparently never been imaged. At least we can now be quite sure it is emitting a significant amount of Oiii. Marcel has just sent this and my previous image to Prof. Robert Fesen at Dartmouth College in the US for evaluation - could possibly be a new SNR, I keep my fingers crossed.

Surprisingly, the Hyperstar v4 with a APS-C camera was producing good enough corner stars right out of the box (although I bought it second hand) and the small deformations was easily taken care of by BlurXT2. A tri-Bahtinov mask I put on last night gave a quite symmetric spike pattern, suggesting no collimation is needed (I have the Hyperstar in a fully screwed in position). That was a big releif. Camera used was a QHY268MM, all on an EQ8 in an obsy next to my dual-RASA8 rig (I will definitively not stop using that).

Cheers, Göran

Here is the Hyperstar Oiii image from last night:

20240401HyperstarPS7sign.thumb.jpg.23afcb27dc2adb08c2db607707d02c7c.jpg

 

And the RASA IDAS NBZ image from February:

20240307NearSh2-182RASAPS17smallSign.thumb.jpg.9010495859ae32857748245b7cff6246.jpg

 

  • Like 12
Link to comment
Share on other sites

3 hours ago, ollypenrice said:

Great stuff, Goran.

Olly

Thanks Olly! Would be nice if it is a unrecognized SNR😃

  • Like 1
Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.