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gorann

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gorann last won the day on March 4

gorann had the most liked content!

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    http://www.mn.uio.no/ibv/english/people/aca/gorann/index.html

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    Astrophotography
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    Värmland, Sweden (59.77 °N)

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  1. But then the moon is out, so you do not miss any high quality data. I hope the motor arrive before the new moon !
  2. Looks odd and you never seen this before. It has a pattern to it. Makes me think it is not ordinary hot pixels. Maybe it could be some electronic interference with the USB connection to the camera. Have you changed anything with regard to cabling?
  3. Great catch for only 4 hours Wim! Peculiar galaxies are the best. I assume this one also has an Arp number. Good luck with the mount!
  4. That is deep Olly! The RASA is a fantastic tool for finding new things. Göran
  5. Thanks Chris! Yes, it has some advantages being a Swede😅 But it should be nothing stopping UK clubs from doing the same. No cropping. That is how it came out at 3 m focal length and 18x24 mm chip.
  6. This beautiful flower-like PN in Canis Minor is 2300 LY away from us, and spans 6 arc-minutes, corresponding to a 4 LY diameter. The image reveals some central Oiii in the nebula, but it is weak compared to the dominant Ha emission so I had to stretch the Oiii signal a bit more than Ha to make it appear. The progenitor star is most likely the small blue star in the center of the nebula. The nebula was hardly visible in the RGB data, which mainly contributed the star color. This is my third image taken with the Margareta Westlund Telescope in southern Spain, owned by the Swedish Amateur Astronomical Society and available remotely to its members. It is a Planewave 17" CDK with an ASI6200MM. 2.5 hours of Ha and Oiii and 1 hour of RGB for star colour. Processed in PI and PS with the XTerminator tools of course. Cheers, Göran
  7. Funny that you should say this. Actually, I now doubt everything I heard about the always clear south Spanish skies. The Swedish Amateur Astronomical Society has just, through various donations, managed to put up a 17" Planewave CDK in Oria, Andalusia at 1000+ m altitude, and I am now one of the users. But so far I have had many more clear night with my scopes here in Sweden. But tonight I am booked in and imaging with the Spanish scope, although it looks like I may only get 4 clear hours there if I am lucky. Maybe it is all about the changing climate. Possibly, we now should start setting up telescope farms in Sweden🤔 Cheers, and CS Göran
  8. Thanks Steve! Seeing was good that night so maybe put a small pixel CMOS on a RASA on such nights.
  9. Thanks, and yes, a lot of distant galaxies around! (even if they look tiny)
  10. I though it would be fun to see how much detail my RASA8-rig could show of this well known planetary nebula. I was pleasantly surprised of the details and depth and how zoomable the image was. This PN really looks quite lonely up there, except for some distant galaxies. 7.5 hours with RASA8 and ASI2600MC and IDAS NBZ filter (Ha+Oiii). Processed in PI and PS including the XTerminator tools. Version A shows the true field of view and version B is a major crop. Cheers, Göran
  11. Thanks Guys! Well Marcel Drechsler of course found something. It is registered in the Simbad database as GSH 122+02-77, an "Interstellar Shell". Marcel says that the shell is at the edge of a faint zone with radio emissions, but it doesn't seem to be an SNR at first glance. http://simbad.cds.unistra.fr/simbad/sim-id?Ident=GSH+122%2B02-77&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id So someone registered it but no one seems to have imaged it, however that works. At least I and Marcel have been unable to find any images other than mine. Great fun!!! Goran's nebula would be OK😁
  12. Recently I noticed some faint blue structures in one of my Samyang 135 images of Sh2-183, but they were too faint for me to be sure they really existed. Moreover, I could not find any images of these possible objects. So a few days ago I took the chance of aiming my dual-RASA8 rig at this area in Cassiopeia, catching about 7 hours. And, there they were. I imaged with my IDAS NBZ dual-band filter, so Ha and Oiii. Thus, these blue structures are likely to be Oiii emitting nebulosity although I cannot be 100 % sure they are not blue reflection nebulosity (there is that bright star nearby). They do look at least partly quite filamentous, which opens for the possibility that they are part of a supernova remnant (SNR). However, when I look in the SNR catalogue (https://www.mrao.cam.ac.uk/surveys/snrs/snrs.data.html) there is nothing registered in that spot. The closest is Tycho Brahe's SN (https://www.mrao.cam.ac.uk/surveys/snrs/snrs.G120.1+1.4.html), which is just outside the right edge of my image. But that SNR is as far as I understand it only emitting X-rays (and radio waves), and no visual light. Any suggestions for what it could be? The image also shows Oiii filaments around Sh2-181, which are also seen in another of my recent images (https://www.astrobin.com/1dm109/) Cheers, Göran
  13. I realized that the area east of the Bubble and Lobster Claw nebulae are rather seldom imaged, including some objects from the Sharpless catalogue inhabiting that region. So I had a go at it the other night. Then I remembered that I had data from 2021 that I could add to the right of the image, making it a 2-panel mosaic with quite a bit of overlap. There are nine Sharpless objects in the image, from Sh2-157 to Sh2-166. What I did not know I would find is the faint arch-like Oiii and Ha emitting structure up to the left (encircling Sh2-165). Searching the SNR catalogue (https://www.mrao.cam.ac.uk/surveys/snrs/snrs.data.html) I found that it belongs to the supernova remnant SNR G114.3+0.3. I have not seen any clear optical image showing this SNR so this may be the first one, It is described in this paper: https://adsabs.harvard.edu/full/1997AJ....113..767F I attach a starless crop that more clearly shows SNR G114.3+0.3: Totally about 8 hours of data collected with RASA8 and ASI2600MC with IDAS NBZ dual-band (Ha+Oiii) filter. Processed in PI and PS. Cheers & CS, Göran
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