wimvb

Thanks for the feedback, Adrian. I must agree that the image looks a lot flatter here, when viewing it on my tablet, than it is when I view it on my processing computer screen. I can post the b/w image later.

This is the last toned H-alpha image. There's now a nice set of four images, but I think I'm done with this little experiment. This is the Pacman nebula. 4 hours of H-alpha, collected under a full moon at 26 Dec. Processed in PixInsight.

Interesting. The thickness of the bearings and shims as suggested in the original video was a problem. Post any updates here please, I would like to see this mod work. Atm I'm also thinking about replacing the gears with a belt drive. Only thinking, mind you, not doing any actual replacements yet.

A different channel combination, so a different entry. (Judges, if this violates the rules, then please disregard my first entry.) This time: (Edited) Red = 50/50 Ha/Sii Green = 80/20 Oiii/Ha Blue = 80/20 Oiii/Ha Removed Hydrogen from the green and blue channels, and reduced the amount of Oxygen in the green channel. (Which should make this a SHoO image.) Process (PixInsight) DBE to lift the lower left corner BlurXTerminator StarXTerminator Starless image: Background Neutralisation, using a very small preview of one of the dark nebulae as a reference Histogram Transformation using the screen transfer function as a permanent stretch. This is something which I otherwise NEVER do. This time it worked. Various curves transformations to adjust contrast in dark regions and middle regions HDRMT, protecting the Crescent nebula with a mask Multiscale Median Transform on the Crescent and on smaller details in the Ha clouds. Colour saturation Noise reduction (NoiseXTerminator) Aligning the three colour channels with histogram transformation and curves transformation; adjusting the black points and small individual stretches to get a more pleasing colour balance and to enhance the faint blue clouds in front of the hydrogen clouds. Stars: Histogram transformation in several passes in order to control the star size Combining the starless and the stars images with PixelMath: ~(~starless*~stars) Small colour and contrast adjustments, mainly with LHE at 128, 64 and 32 kernel radius at very low strength

My first iteration. A custom blend in PixelMath, processed in PixInsight. I think the image is still a bit too flat, so I'llprobably update this post before year's end. The process so far: Red: 75% Ha, 25% S Green: 10% Ha, 90% O Blue: 100% O BlurXterminator, StarXterminator Starless image: Histogram Transformation Curves Transformation Multiscale Median Transform with masks to target specific areas with bias to increase local contrast NoiseXTerminator Star image. histogram transformation PixelMath to put the stars back into the image

Yes, please. There's a limit to how much fun it is to reprocess old data. So these data releases are very much appreciated.

Methinks I should have expressed myself less casual. After the holiday break, I will just have to set up the gas discharge lamp and take a few pictures. Meanwhile, here's my very unscientific spectrum of the light source. Mind you, this was done with a CD spectrograph and a mobile phone camera in classroom lighting (overhead LED lamps) during day time. In the meantime; yes, I'm aware that the blending of blue and red gives magenta. But that is under the assumption that the blue and the red have about equal intensities. The final colour that we perceive not only depends on the intensities of the individual constituents, but also on the overall brightness of the source, which depends on the pressure of the gas in the lamp, as is evident from the difference between high pressure and low pressure sodium lamps. 😉😉😉

Thanks, Göran. You know, the "true colour" of Hydrogen is a pinkish white. At least according to the gas discharge lamp I use when teaching atomic physics. But maybe in space the Hydrogen Beta line is so much weaker. If I also had a Oiii filter in my filter wheel, and the moon were less prominent, I would probably have chosen a HOO colour palette. "But since I don't, I didn't." 😉

Westerhout 5, if you didn't already know it, is the Soul Nebula. So, this image is all about the dark and bright sides of the Soul. I captured the data for this image during a gap in the clouds yesterday evening. With a near full moon high in the sky, and snow on the ground, conditions were far from perfect. Still, 4 hours of H-alpha was enough to produce this image. In order to enhance the drama in the image, I removed the stars and used tone mapping to get rid of the cold black and white. All processing was done in PixInsight (this image is best viewed on a computer screen. Click on the image to open the full size version)

A few hours without clouds, but with a nearly full moon and snow on the ground. This is not a good combination for astrophotography, but I guess we grab what we can get. I pointed my scope near ic 1848, the star cluster in the Soul Nebula, and captured details in the hydrogen clouds. This is 4 hours of H-alpha, without any fancy processing. That will have to wait until later. I think that I will crop this image to get a better framing.

A lifetime ago, before I had kids, I used to do photography the real way. The last step in the creative process used to be Selenium toning, to produce a warmer toned black and white print. The longer you had the print in the toning bath, the stronger its effect would be. I have tried to mimic the effect with a few monochrome H-alpha images. "Mimic", because I no longer have a dark room, and all my image processing is done on a computer, in PixInsight. This is a starless H-alpha image of the Tadpoles Nebula, ic 410. The integration time was 4 hours and 48 minutes. Processing was done in PixInsight. To get the warm colour, I just combined two different stretches with ChannelCombination. The stronger stretch went into the red channel, and the weaker stretch went equally in both the green and blue channel. Once I had the RGB image, I applied further stretches and a bit of "dodging and burning" to enhance the contrast.

Thank you. Mood is what I was going for.

The data is from earlier this year, 80 minutes H-alpha. The processing is new. A starless version of this popular object. I made two stretches that I combined with PixelMath to get a warmer tone.

The roof isn't automated. The observatory is built on a South facing slope and has a slanted roof. The winch that closes the roof is visible to the right in the video clip. I've considered replacing it with a gate motor, but those may not be strong enough. Besides, the closing roof would knock the dew shield off the scope, unless I park it horizontally. The spectral lines are the glare from HD65626, yes.

The party was early, and the nights are long this time of the year. And the observatory is automated. The security camera in my observatory captured the scope parking early in the morning, while I was sound asleep. 1703043602000.mp4

That pretty much sums up the situation last night. A very unexpected clear night coincided with a dinner party with colleagues. When I got home I opened the observatory, but couldn't find an interesting enough target. So I settled for a group of "small" galaxies in Lynx, close to Camelopardalis. Nest 100044 consists of about 18 galaxies and is situated about 380 million light years away. There are many other galaxies in this field of view. PixInsight found about 90 identified galaxies, but there are also a decent number of unidentified ones. One of the most distant galaxies in this field is about 2 billion light years distant. The image may not loook impressive and colourful, but shows things in a grand scale. This is 6 hours of RGB data, collected with my MN190 and ASI294MM Processed and annotated in PixInsight, with help of the TypeCat script. There is a glare of the nearby star HD 65626 in the image, but I didn't bother to remove it. Click on the image to open a larger version.

Hence the title of my recent post 😉

Nice! It’s a bit low in the sky for me due to trees, but your image gives me inspiration to try to catch it too.

Great image already. Do you have a sky darkness that allows you to catch the tail?

Thanks, Chris. I have several versions of the image by now. The image that I have in my first post is just RGB, without synthetic luminance, I believe. The one that I posted yesterday has a synthetic luminance and stretched somewhat differently.

Reworked the image with the new version of BlurXTerminator. This version does wonders on dodgy stars, and I didn't need to crop the image. I used the combined RGB data as a synthetic luminance.

I stand corrected. The vendor id for ZWO is 03c3. 0403 i s FTDI, the EQDIR cable You can see my usb list here. The first device is my ASI294 camera. The next ZWO is my ASI290 guide cam (fourth in the list), and the last one from ZWO is my filter wheel

Should I go over to my image processing computer and examine my version of M33? 😁 https://www.astrobin.com/tr3ihi/B/

Minor planets are asteroids and such, I think. I'm not sure about the exact differences, but I beleive that the distinction between planets / dwarf planets / minor planets is about size. The definition of a planet that I saw a long time ago was that a true planet has cleared its orbit of any other matter. Only larger bodies can do that. Asteroids / minor planets obviously haven't done so, or there wouldn't be an asteroid belt..

Wasn't RASA developed for sky surveys of minor planets and other "fast moving" bodies that might come close to Earth? If so, you finally use the scope as intended. 😁 Great and surprising image, Göran.