Yes, here is a picture taken by Hubble: https://esahubble.org/images/heic0609a/
I belive it is imaged in Ha, Oiii, and Sii but I could be wrong.
Helge Büsing:Yes, here is a picture taken by Hubble: https://esahubble.org/images/heic0609a/
I belive it is imaged in Ha, Oiii, and Sii but I could be wrong.
Interestingly, there is no hit on AstroBin. But a normal focal length seems to be enough...
Helge Büsing:Yes, here is a picture taken by Hubble: https://esahubble.org/images/heic0609a/
I belive it is imaged in Ha, Oiii, and Sii but I could be wrong.
Interestingly, there is no hit on AstroBin. But a normal focal length seems to be enough...
Probably because it's a really challenging target. Here is a picture I found on the Wikipedia page from a 24 inch telescope and it's still really dim. https://www.wikiwand.com/en/Cassiopeia_A#Media/File:CassiopeiaA_Supernova_Remnant_Nebula_from_the_Mount_Lemmon_SkyCenter_Schulman_Telescope_courtesy_Adam_Block.jpg
Luca Marinelli:
I actually have about 75 hours of SHO data on Cas A from last season that I haven't processed yet with a 10in f4 telescope. The most challenging channel is Ha, while SII is the brightest. The main structures from the Hubble image are visible but not all the fine tendrils. I'll posting my image in the near future.
Luca
Interesting question indeed.
Short answer: yes, i accidentally did so!
Please see:
https://www.cloudynights.com/topic/791350-cas-a-nebula-serendipitously-imaged-at-a-fl-of-250mm/
and
https://www.astrobin.com/56qibt/C/
Definitely worth a serious attempt.
Cheers, Des
Interesting question indeed.
Short answer: yes, i accidentally did so!
Please see:
https://www.cloudynights.com/topic/791350-cas-a-nebula-serendipitously-imaged-at-a-fl-of-250mm/
and
https://www.astrobin.com/56qibt/C/
Definitely worth a serious attempt.
Cheers, Des
Helge Büsing:
Interestingly, there is no hit on AstroBin. But a normal focal length seems to be enough...
Victor Van Puyenbroeck:
Try searching for "Cas A supernova remnant". This returns mostly images from CTB-1 (another SNR), but also several amateur images of Cas A in the visible spectrum. E.g. these images https://www.astrobin.com/zy8o8y/ and https://www.astrobin.com/pymrak/E/
Luca Marinelli:
Here is just a quick snapshot in straight SHO palette of my data with very little processing other than a stretch and a bit of noise reduction. You can see that the Ha signal is tough to pull out but is where you expect it from the Hubble image.
It's also interesting that the inside right arm of the nebula (only a few green dots outlining it) is almost invisible in the narrowband data but quite bright in RGB (I see it in my 2 hours of RGB and is prominent in the images linked by Victor above).
Luca
![](/<a href="https://www.wikiwand.com/en/Cassiopeia_A#Media/File:CassiopeiaA_Supernova_Remnant_Nebula_from_the_Mount_Lemmon_SkyCenter_Schulman_Telescope_courtesy_Adam_Block.jpg">https://www.wikiwand.com/en/Cassiopeia_A#Media/File:CassiopeiaA_Supernova_Remnant_Nebula_from_the_Mount_Lemmon_SkyCenter_Schulman_Telescope_courtesy_Adam_Block.jpg</a>){kind=link}
