gorann

Here I tried to squeeze out as much detail as possible of my image using HiPass filtering and Local Contrast Enhancement in PS, I I think I see a bar there. (Also in this images I Googled: https://cseligman.com/text/atlas/ngc42a.htm) https://fr.wikipedia.org/wiki/NGC_4250)

Yes, I think even more stars are missing from the HST image - odd!

Well, you win some and loose some😁 Actually, it may not even be a ringed galaxy but a spiral. Here is a stretch I did from a HST image of it from this link: https://hla.stsci.edu/cgi-bin/display?image=HST_11219_54_NIC_NIC2_total&izoom=1.000000&detector=NIC2&aperture=NIC2-FIX&title=11219_54 NIC2 detection (combined) UGC7329 Cheers, Göran

I stretched that Hubble image and it does look like a spiral galaxy. Apparently it is also annotated as UGC7329

Thanks Martin! I have now put a link to this thread on the Ringed Galaxies Thread.

I was now alerted to this thread by @Martin Meredith. Yesterday I started a thread about my image of NBC4250 showing that it is a ringed galaxy but has apparently not been recognized as such.

Actually, I found that the "dark ring" is a visual illusion from the bright centre. I used the eyedropper tool in PS and measured the brightness in the dark ring and in the surrounding sky and they are the same.

Yes, that looks odd, what filters were used?

The best of luck Steve, I look forward to the result! It is faint so grab as many hours as possible.

Wim just posted this confirmation on the post I made on Astrobin, so the ring seems to be real and has been picked up by some scope: https://www.oulu.fi/astronomy/S4G_PIPELINE4/quality5/decomp0042.html But here is the tif if you want to try it: 20221019-20 NGC4236+DanaPN RASA1+2.tif

My guess is that to classify as a ringed galaxy it needs to have a clear separation between the centre and the outer ring.

Thanks! Great that it not only me seeing it😁

Go for it! And thanks! It is raining here....

I recently posted an image of NGC 4236, which also contained the smaller NGC 4250. When I took a closer look at that galaxy I could discern a faint but clear outer ring. There seems to be very few images of this galaxy and I have not found any image showing this outer ring or pointing it out. I have here made a crop and a careful reprocessing to make sure that the ring was not an artifact of, for example, Gradient Exterminator or Hi Pass filtering, but it was clear that the ring was there also after only stretching the image. According to this interesting article ringed galaxies are very rare, only one in 10 000 is of this category: https://bigthink.com/starts-with-a-bang/ring-galaxies/ Since the original aim of this image was to look for a possible new PN, I was using a dual-band Ha+Oiii filter, which is not ideal for imaging galaxies as it blocks most of the visual light spectrum, but apparently the RASA 8 is enough of a light bucket to overcome this. Also, the galaxy is a bit on the small side for being imaged at a focal length of 400 mm, and this image is a drastic crop of the original. Comments most welcome, especially those that prove me wrong! Cheers, Göran Here is my previous post where NGC4250 is that small galaxy in the top right corner:

In previous versions of StarXT I also had these squares turning up occasionally, but never as psychedelic as yours Steve! Obviously that super-intelligent program divides the task up in squares. I assume you will send it to Russ so he can figure it out.

Dana Patchick has been sending me co-ordinates for blue dwarfs that could indicate possible planetary nebulae. The idea is that my photon-sucking dual-RASA8 rig should be a great tool for finding these faint objects. So far we have had no success, but no one said it should be easy. Here is my latest attempt from Wednesday night. Combined I got 7.3 hours with the RASAs before mist put a stop to it, and my piggybacking Samyang 135 caught 3.7 hours. Unfortunately, there was nothing to be seen around the blue dwarf centrally in the image, but I did catch NGC4236 and a few smaller galaxies. I am a bit surprised that the galaxy came out so well since the RASA is a wide-field scope, so not much of a hunter for mid-size galazies, especially with a dual-band Ha+Oiii filter (IDAS NBZ) blocking most light The Samyang also appears to have caught some IFN down in the left corner of its image. In any case, I am not giving up, Dana has more candidates for me to aim at, and one night....... Cheers, Göran The RASA (with ASI2600MC and NBZ filter) image - the probably non-existing should have been centrally in the image: The Samyang 135 (with Omegon veTEC571C and NBZ filter) image:

Thanks a lot Ian! Yes, that is also as I see it, almost like volcanoes erupting through the dense Ha dust.

Yes, but we amateurs also use NB filters and I never seen or heard of bright stars completely disappearing. However, maybe they do, some apparently only show up in IR. I had a look at Liverpool Telescope HaRGB data (a 2 m RC on La Palma) that I processed several years ago (https://www.astrobin.com/286659/). And, those additional star seen in the JWST image are NOT there, so clearly JWST Near-IR images reveal stars that we do not see in visible light. I am still puzzled. Cheers, Göran

Thanks Martin! I agree that the red is a quite overwhelming and I fought to suppress it, which was not easy. However, I now posted a revision with an new effort to tame the red and to tweak it a bit towards yellow, which I liked better.

Here are Sh2-206 to Sh2-217 caught with the Samyang 135 (@f/2) and Omegon veTEX571C the other night, piggybacking on my dual-RASA rig. To the image I have added a bit of RASA data to sharpen the Sharpless objects a bit. All taken with an IDAS NBZ dual-band filter (Ha+Oiii), and processed using PI and PS, including StarXTerminator. 89 x 5 min, so totally 7.4 hours. When planning the night sessions I always aim and frame with the RASA images in mind, and almost forget the little Samyang sitting there and taking what it gets, giving me some extra unplanned bonus images. Cheers, Göran

I am really puzzled by all those additional stars in the JWST image, including many very bright ones. I did not know there were pure IR stars, but then what do I know.

Thanks Wim! I actually like the frog, so much that I made a cut out (actually Tuesday night's original image before you talked me into making a panorama😆)

Thanks! He he, I missed that! I could also be laying eggs....

Thanks Roy! LOL, do you see any mechanical structures then?

This is a bit embarrassing. Two nights ago I aimed at Sh2-210 since I thought I saw some interesting structures around it on Aladin Star Atlas. I collected 14 hours with my dual-RASA rig and showed the restult to @wimvb. He soon replied and suggested that I should make a mosaic since I had imaged this area back in April, something that had slipped my mind. By chance it fitted quite well to the April image, both containing Sh2-210, but in opposite corners. So, here is the resultant two-panel mosaic, with the new data making up the right half, and with data for the left half collected back in April (see https://www.astrobin.com/j6qtu9/C/), which contained the first visual image of the SNR G 150.3+4.5, seen in the upper left corner of the mosaic. I now noticed that there are also surprisingly few good images of Sh2-210 to be found. Since I have now a total of 42 hours of f/2 data on that nebula I think it may be the clearest image of it taken. I like the large grayish shape to the right, which to me as a biologist looks like a swimming Xenopus frog. Dual RASA 8 and ASI2600MC with IDAS NBZ filter, all on a Mesu 200. Right half is 212 x 4 min, and left half is 337 x 5 min, so totally 42 hours. Processed in PI and PS, including Star XTerminator. Cheers, Göran The panorama: Astrobin annotation: A Sh2-210 close up, sharpened the contrast a bit in processing: And the Xenopus frog: