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wimvb

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wimvb last won the day on December 27 2023

wimvb had the most liked content!

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    http://wimvberlo.blogspot.se/

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    Sweden (59.59° North)

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  1. Will be delivered on wednesday, so all is good.
  2. Thank you very much, Bryan. A new motor is on its way. I've only missed one clear night so far.
  3. The stream is about brightness (luminance, if you will), while the background is about colour. There is no ifn, so you can keep the background fairly flat. With this image, I would probably start by using a very strong dose of MMT on chrominance with a mask protecting the galaxies, on the RGB image, before stretching As i wrote before, the luminance can be controlled by a combination of Histogram Transformation, Curves Transformation, and HDR compression (HDRMT). I played around with the image you posted, and came up with this. Just a little more of the tidal stream (it's a jpeg, xisf would be better), but kept detail in the galaxies. No work on the background.
  4. in the mean time, it's a clear night 😏
  5. That may very well all be, but I don't want to blow out my mount's motherboard, testing. Better safe than sorry.
  6. 6 bars per coil on the stator, which has 8 coils, and 2 x 50 on the rotor Thanks, both. Vlaiv, I got the same information from the EQ5/EQ6 group on facebook. Besides the number of steps and the torque, there is also a difference in the phase resistance, and with that the current draw. There are low current versions and high current versions of most stepper motors, as well as 5V and 12V versions. The motor in the mount is 12V, but since a model number is missing, it may be either low resistance (high current) or high resistance (low current). I measured a resistance between connections of about 6 - 8 Ohms. Not very conclusive, since the phase resistance also depends on how the phases are wired internally.
  7. It is 48 mm (haven't measured it, though). The removed back makes it look shorter than it is. The front measures 42×42 mm, and it's slightly longer than that. 0.85A/phase is also plausible, the mount draws about 2.5 A while slewing. But I also have to make sure that the shaft is long enough. The aluminium block in the background (right side) sits between the motor and the belt. I ordered the replacement because I need something fast. I don't want to miss galaxy season.
  8. ... and combine that with temperature changes, you have a recipe for metal fatigue. A few days ago, my AZ-EQ6 started tracking erratically, and guiding was all over the place. I narrowed the cause down to the RA motor (it made a strange noise when slewing with the hand controller). Today I removed the motor and opened it up ... I've ordered a replacement motor from Pierro Astro, but these are quite expensive (140 €). As a backup, I'll see if a standard NEMA17 0.5 Nm stepper will do. Btw, does anyone know if this is a 0.9 or a 1.8 degrees/step motor?
  9. I've never had much luck with GHS on galaxy images. I use a combination of Histogram stretch, Curve Transformation and HDR Multiscale Transform to control the core
  10. Great image. Definitely better than the bin2 version.
  11. Nice!! The tidal stream of ngc 3628 is just visible.
  12. Thanks, Göran. Of course it has; nr 215.
  13. According to Wikipedia: "NGC 2782 is a peculiar spiral galaxy that formed after a galaxy merger in the constellation Lynx. The galaxy lies 75 million light years away from Earth, which means, given its apparent dimensions, that NGC 2782 is approximately 100,000 light years across. NGC 2782 has an active galactic nucleus and it is a starburst and a type 1 Seyfert galaxy. NGC 2782 is mentioned in the Atlas of Peculiar Galaxies in the category galaxies with adjacent loops." This image was taken during a gap in the clouds on March 11. Despite the fact that the sky was clear during the entire night, I could only collect 4 hours of data. After the meridian flip, my mount broke down, and now I'm waiting for a replacement RA motor. Nonetheless, the data was collected with my SW 190MN and ASI294MM camera RGB: 1.5, 1.5, and 1 hour Processed in PixInsight
  14. Thanks! I am, as sailors say, dead in the water. Yesterday I started on a new project, but after the meridian flip, my mount started misbehaving. At first I thought a cable pulled the mount and the clutch had come lose. Today the problem persisted. I connected the hand control and noticed a strange sound from the RA axis. It seems that the RA stepper motor has a mechanical failure. I just ordered a replacement from Pierro-Astro in France. Hopefully, I will be able to fix the mount before the season ends. If not, this is going to be my final image until after the summer.
  15. This is the large scale and wide field version of Abell 1185 which I previously published in the Deep Sky Imaging section (judges, if it is not allowed to enter an image previously posted on this forum, please remove this entry from the competition). 16.5 hours with my MN190 and ASI294MM Capture dates: March 6 and 7 of this year Click on the image to show the full size version You can find the annotated version here: https://stargazerslounge.com/topic/419923-galaxies-galore-below-the-paws-of-the-great-bear/?do=findComment&comment=4468655
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