silentrunning

Managed to grab 5 x 5 mins in R, G and B of the supernova in M101. I would say it was about m11.

Green box shows location before it went bang!

Yep that's it! 👍

I was imaging M108 last night and managed to get 3x5 mins in L,RG and B before the clouds arrived. This was with a 12" GSO RC and a QYH163M. Looking up this object I was surprised to see that a supernova had been discovered a few days ago and I managed to locate it in my data. SN reference - https://www.wis-tns.org/object/2023dbc

I've designed and printed both a 5 and 7 position 2" filter wheel using my Ender 3 pro. For the motors I use small Nema 17's that are controlled by an Arduino UNO with a CNC shield that holds up to 4 stepper motor controllers. I have used the one arduino with the shield to control RA and DEC on a 3D printed German Equatorial plus a focuser and a filter wheel. I wrote the firmware for the controller to emulate Skywatcher firmware on the RA and DEC motors and filter wheel and focuser on the other two motors. Having written ASCOM drivers for everything it connects seamlessly with all the usual control and acquisition packages. I've used the whole set up with a QHY163 camera and a Samyang lens. I wouldn't trust 3D printed components to take the weight of the camera etc so my camera on this setup is held in place - as is the Samyang 135 lens - with rings that I designed and 3D printed. One problem I came across is that PLA seems to let through certain wavelengths of light so it is crucial to paint the filter wheels. I used Black 3 but this left an awful sooty deposit and I got a much better result using mat black spray paint. Here's a clip of the mount during development - It's absolutely silent now as I moved from A4988s to trinamic 2209 controllers, massive improvement, incredibly quiet and amazing microstep resolution. I also printed various worm gears including gyroid ones - as shown in the second clip. In the end I went over to a belt driven system that improved things enormously as PLA gears tend be just to rough even at the smallest layer heights. I will see if I have any photo's of the filter wheels. Good luck. Let us know how it goes. John Here's a pic of some of the other components. It's all disconnected at the moment as I work on other things. This shows the ring system, the 2 filter wheels, a glare shield for the Samyang and a mount plate all 3d printed. Also a handy carousel holder.

All examples straight out the box with no additional processing and default parameters.

During the processing of some data on M45 I ran Starnet 2 to create a starmask and got this incredible result which has had no additional colour processing. I guess it shows how the brain fills in the stars with the color of the blue nebulosity as the images are otherwise identical just one with and one without the neb!!!

It is a fantastic book Mark. I can't imagine you being disappointed. I actually contacted Prof Kaler after having finished a second reading of it which I started almost straight after I first finished it! So much wonderful information and beautifully written. He wrote some very kind replies to me. Based on this book I bought this book of his https://www.amazon.co.uk/gp/product/0716750759/ref=dbs_a_def_rwt_hsch_vapi_taft_p1_i7 and I can say it's just as astonishing. It maybe getting on a bit but there is nothing in it which has fundamentally changed.

"Stars and their Spectra" by James Kaler is the best book I have read on the mechanisms behind stars and their evolution. It contains next to no equations but digs in very deep and is one of the most readable books I have ever picked up. I paid £29 for the hard cover so I've no idea why it is currently £160 on Amazon. Maybe it's popped out of print for awhile. Here's my Amazon review of it. ---- As an amateur astrophotogragher looking for additional pursuits related to astronomy I have been toying with the idea of a buying a diffraction grating to attempt some very basic spectroscopy of the stars. Looking into this subject I came across this book by Kaler which appears to be well received and offered at a good price for a substantive hard back. Once started I could not put this book down and read it word for word over a couple of weeks. It is beautifully descriptive, written in a refreshingly warm style in contrast to so many text books that though detailed mathematically are very cold and feel almost unattached to their subject matter. After a general introduction Kaler offers a description of how observational astronomy can be used to derive the physical properties of stars and then gives a superb account of the atomic processes that give rise to continuous, emission and absorption spectra and why and when these spectra can appear in combination. After a description of prismatic and diffraction based hardware the book starts in earnest to explain the spectral sequence, initially giving an extensive account of the history and different systems that have emerged over time and how these have been distilled down to today's system OBAFGKMLT. The HR diagram and the MK system of luminosity is described in detail and then the book starts in earnest by allocating an individual chapter to each star type starting at M and making its way through 300 odd pages to type O. Each chapter is absolutely engrossing due the authors passionate style of writing. Beyond type O the author continues in the same vein to describe planetary nebulas, protoplanery systems, white dwarfs, neutron stars and many other exotic types. Nova and supernova are described in detail and the book concludes with 40 pages or so dedicated to the subject of the live cycle of different mass stars which beautifully draws on all the details of the previous chapters to give the best description of the life of a star I have read. This book has essentially no equations but is clearly written by someone who is profoundly knowledgeable and besotted by the stars. In summary a wonderfully detailed yet ever so readable book that I highly recommend. ----- https://www.amazon.co.uk/gp/product/0521899540/ref=ppx_od_dt_b_asin_title_s00?ie=UTF8&psc=1

It hasn't got WiFi. The PC running Octaprint connects to the printer via the USB cable.

I learnt to design stuff with Freecad and then switched to Fusion 360 which is also free and a stunning design environment. I was using Cura as a slicer but have switched to PuraSlicer. I don't use the SD card, I have Octaprint running as a server on my Windows 10 PC which talks to the Ender 3 via it's USB port.

Got into 3D printing a few weeks ago and have completely immersed myself in it. After doing loads of research I bought the Creality Ender 3 Pro and it's superb. Not a lot of difference to the one you are looking at and with the upgrades mentioned I would consider it a great buy.

Superb Carol. Great processing.

Well I've never used an SLR before for anything but one turned up yesterday. 🙂 It was a stunning evening last night and the comet was perfectly placed for viewing from my back garden but unfortunately not accessible from the Obsy. Having recently purchased a Samyang 135mm F2 lens that is currently bolted to the mount in the Obsy I decided to splurge on a Canon SLR so I could potentially get into 'normal' photography and make more use of the lens. Anyway after a few hours reading the manual - the camera seems to have more functions than the space shuttle - and a quick look at the settings some people have been using to capture the comet I pointed it at the comet and grabbed some 20 second frames using the standard zoom lens that came with it. It proved hard to focus and the lens is clearly not of a quality we astrobods would hope for but it was nevertheless exciting to see the comet on the cameras screen. I also had a go at light 'painting', during a 20 second exposure I shone a torch around the back garden and that seemed to work really well as well. So all told I'm pretty pleased with this first stab at using an SLR. This is 20s at f5.6 ISO 800.

I found this a tricky object to process as well. If you do a Google search for NGC6888 thousands of images come back very few of which appear 'right' to me or give me something to aim for. Strange object.