gorann

I think this was already pointed out but here it is again: I just calculated the pixel scale of his set-up, and it is 1.61"/pixel, so any guiding error in any direction less that 0.8"/pixel could never be seen in the image. So guiding error is totally exluded here.

I agree with the great majority here. There is no way this can be due to guiding. Hopefully it is something sagging in the imaging train. I had an ES ED80 and the focuser is far from the best and can easily be sagging, but there are some screws that can be tightened which could fix it. Does it all feel stiff if you try to move the camera? Hopefully it is not collimation, since this is a refactor it is not something you can fix yourself. However, bad collimation would probably result in fan-shaped stars as @ollypenrice pointed out, so hopefully you can fix it by tightening up the focuser. Could also be that the sensor inside your DSLR camera is not perpendicular to the optical axis (if that issue you need a new camera).

Well, this is a SNR, which is different from a PN, although both often emitt Ha and Oiii. However, incidentally I have actually recently joined in the PN-hunting crowd by pointing my dual-RASA rig at coordinates given to me by Dana Patchick in California. He has found a great number of them by looking for suitable blue dwarfs that may be the origin of the often very faint Ha-Oiii shell making up most of the PNs. Our first try two weeks ago was a miss (non existent of too faint for my set-up) and I was planning to aim at another candidate last weekend but got preoccupied with this SNR instead. Hopfully I will have a go at a PN candidate on Friday. Göran

PS. I had my Samyang 135 (@f/2 with an ASI2600MC) piggybacking while the RASAs were collecting the SNR data, and I cannot see a trace of the SNR in that image (82 x 5 min at gain 100, so 6.8 hours). Maybe it would have found something if I had used NB filters, but it is easy to see why this SNR have been missed by most. (And I see from the star shapes that I need to work on the sensor distance or stop the Samyang down) Cheers, Göran

Go for it! F/2 and NB will be the best option. Preferentially without moon. CS Göran

Thanks a lot Michael! Yes, a big surprise when I saw a spagetti nebula in the worng place😁

Added a second panel to the image to give the SNR a bit more space🙂 The star at the top right is eta Cas

RA center: 02h18m29s.21 DEC center: +62°30′13″.3

Did a negative:This SNR has eyes, a nose, mouth, cheek, and neck!

I have now done a bit research on it and found that by coinsidence a preprint about this nebula was uploaded to arXiv (https://arxiv.org/abs/2202.07749v1) by professional astronomers less than a month ago and it contains the first full image of it (attached here), so mine is apparently the second one. Cheers, Göran

I have been collecting RGB data on the region west of the Heart Nebula with my dual RASA8 rig and last night I put on the IDAS NBZ filter to get some Ha and Oiii to add a bit more punch to it. After stretching the image and making a starless version (Star Xterminator in PS) I could see something not unlike the Spagetti nebula appearing. So a gigant super nova remnant (SNR). So I messaged my friend @wimvb who knows his ways in catalogues and he could confirm that is should be one there. It has no name but is designated hb3 or G132.7+1.3. Wim found this info https://www.mrao.cam.ac.uk/surveys/snrs/snrs.G132.7+1.3.html However, as far as I can tell not many knows about it and I have not found any images of it. I may of course have missed it, so please enlighten me if you know of any images! They need a bit of more processing but out of excitement I post where I am right now. So here is first the 6.5 hours of Ha+Oiii data (RASA 8 withh ASI2600MC and NBZ filter), starless version: And this is how it looks like after comnined with 12.5 hours of RGB data (RASA 8 with ASI2600MC without filters): And here are some tips from Wim on how to do the detective work:

Managed to gather data for around 50 images in 2021 with my dual RASA8 rig (with ASI2600MC). All to be seen here https://www.astrobin.com/users/gorann/. So here are 10% of them with focus on never or rarely imaged objects. Cheers & CS, Göran Supernova remnant CTA 1 (SNR G119.5+10.2) and NGC 40 (IDAS NBZ Ha+Oiii filter) IC348, NGC1333 and the "Strawberry Nebula" LBN437 "Predator-Prey Nebula" - unnamed IFN near the Fish Hook nebula. 5 panel mosaic MBM 163 - 165 and LBN 569 in Cepheus

Just identify the column number and use Cosmetic correction in PI to remove it (average from the neighbouring columns just like in Olly's AstroArt). There are good free videos on the net that will show you how to do it in PI (I expect you find it by just googleing "bad columns Pixinsight" or "Cosmetic correction Pixinsight").

Actually I have no clear indication of flexing with the RASAs, possibly because they are rather short and because the FL in only 400 mm. A dual Esprit 150 rig is clearly more of a challenge and a bracing plate is probably a must. I will probably ask for your advice when I start building it in the summer.

Looks great Steve! That is the setup I will build this summer once Olly's old Mesu gets updated and delivered here. But what are those odd looking things at the ends of the scopes, attached with aluminium foil. They are not round and red😉

VdB 10 and LBN 679 in Perseus are some rather faint and very rarely imaged nebulae south of the Soul Nebula. I found them surfing Aladin Sky Atlas (DSS2 data) and on Astrobin I can only find one image of the blue reflection nebula VdB 10 (aka LBN680) and none of the red nebulae, so the LBN 679 (the long nebulae of Ha emitting dust) may never have been properly imaged before. In both cases this may be because they are quite faint and best suited for a very fast wide field telescope like the RASA. The large nebula on the bottom left does not occur in Lynds' catalogues but is part of Sh2-202. I find again that the NBZ filter is quite good at picking up blue reflection in addition to Oiii. I collected 188 subs duing the whole night but decided to only use the first 88 before the moon came up, as it clearly made the subs a bit washed out. Data collected 21 Feb 2022 with my dual-RASA8 rig with ASI2600MC and IDAS NBZ filter (Ha and Oiii) sitting on a Mesu 200. 88 x 5 min, so 7.3 hours (gain 100, offset 30, -15°C). Processed in PI and PS. Cheers Göran

Thanks a lot Shibby! There is much more out there in the Milky Way to image than the ususal ones.

Just ordered them. Thanks for the tip and review - "T2" would also have worried me a bit! PS. When I logged in it said 4 left in stock, and after I ordered them it still says 4 left in stock.....

These are some rather faint and rarely imaged nebulae south of the Soul Nebula. I found them surfing Aladin Sky Atlas (DSS2 data) and on Astrobin I can only find one image of the blue reflection nebula VdB 10 (aka LBN680) and none of the red nebulae, so these may be Astrobin Debut objects (as Gary Imms call it). It may be because they are quite faint and best suited for a very fast wide field telescope like the RASA. The large nebula on the bottom left may not have any designation in Lynds' catalogues (at least none is found by the advanced plate solving on Astrobin) but is part of Sh2-202. I find again that the NBZ filter is quite good at picking up blue reflection in addition to Oiii, I collected 188 subs duing the whole night but decided to only use the first 88 before the moon came up, as it clearly made the subs a bit washed out. Data collected 21 Feb 2022 with my dual-RASA8 rig with ASI2600MC and IDAS NBZ filter (Ha and Oiii) sitting on a Mesu 200. 88 x 5 min, so 7.3 hours (gain 100, offset 30, -15°C). Processed in PI and PS. Cheers Göran

I just ordered three of them from Farpoint, one for the RASA 8, and one for each of my Edge HD 8 and 11. But 65 USD for shipping from the US was a bit stiff, but that is apparently how the world works nowadays. I will try it on the RASA first, since my Edges are not on any mounts right now.

A bit more googling and I found where to buy them: https://farpointastro.com/search?type=product&q=Tri-Bahtinov

I found this rather recent video on Youtube with a guy that seems very happy with his tri-Bahtinov mask. Just a pity he did not say how to get hold of one.

Here are reflection, emission and absorption dust. The two refelction nebulae (vdB 14 & 15) and the large Ha-emission nebula Sh2-202, containing the dark nebula LDN 1384, lie close to the more commonly imaged Heart and Soul nebulae. 114 x 5 min (9.5 hours) collected with my dual-RASA8 rig and ASI2600MC (gain 100, offset 30, -15°C). Processed in PI and mainly PS. As usual, I gave the nebulosity an extra stretch on a starless version (Star Xterminator) before I brought the stars back. Last image for a while since clouds, rain and snow moved in. Cheers, Göran

Congratulations Adam, that is amazing! Great image of course, and done with a SW 130PDS, which should make you extra proud. A great example for many - it is not the size but the way you swing it that matters😁. I had no idea that they could be sitting on images for two years. I think I sent them something half a year ago so a miracle may still happen.

These two refelction nebulae (vdB 14 & 15) and the large Ha-emission nebula Sh2-202, containing the dark nebula LDN 1384, lie close to the more commonly imaged Heart and Soul nebulae. The moon was up so I imaged with the IDAS NBZ dual-band Ha & Oiii filter. Its bandwith is broad enough to also pick up bluish refelction nebulosity, although I did spice it up a bit with some Esprit 150 lum-data I had. I like the broadness of the NBZ filter as it also gives stars a rather naturally looking RGB colour, and I process the images like I process RGB data from the ASI2600MC. So, 114 x 5 min (9.5 hours) collected with my dual-RASA8 rig and ASI2600MC (gain 100, offset 30, -15°C). Processed in PI and mainly PS. As usual, I gave the nebulosity an extra stretch on a starless version (Star Xterminator) before I brought the stars back. Last image for a while since clouds, rain and snow moved in. Cheers, Göran