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GreatAttractor

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About GreatAttractor

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    Poland
  1. Good work! It's not easy to get an evenly illuminated (on-band) full- or half-disc with a tilt-tuned etalon. When I worked with my Lunt 35, I usually used a 1.6x Barlow (2x Barlow's lens element screwed into camera's nosepiece) and took 4 panes for a mosaic (with a generous overlap). Results were usually uniform:
  2. You bet! In case of a good close-up, the rotation is clearly visible over mere 2 hours:
  3. Thanks. Of course, everything is captured and processed by me unless noted otherwise
  4. This season started for me almost a month later than it did last year, but equally well. Great seeing on Saturday (so, a 6-hour session) and quite good on Sunday. Everything captured with a 90 mm refractor + pressure-tuned etalon, PGR Chameleon 3 mono (ICX445), processed with Stackistry and ImPPG. 30-second intervals in time-lapses. Class M5.3 flare in AR 2644 (maximum at 4/02 8:04 UTC), 0:46 h total: Solar event list and descriptions can be found at http://www.swpc.noaa.gov/products/solar-and-geophysical-event-reports. Smoky prominences, 0:53 h total: Active Region 2645, chromo- to photosphere transition, made by gradually lowering the etalon pressure: Pretty but rather minor activity in AR 2645, including penumbral waves, 1:42 h total (click to view, takes a while to load): AR 2645:
  5. Yeah, a flaring AR on the limb is a peach!
  6. Yesterday I was bitten by kernel update (to 4.10.5) on my main computer (I use Fedora 25). The boot process would at some point just stop, with nothing suspicious in the last visible boot messages; the machine was responsive, though, and Ctrl-Alt-Del reboot was possible. Booting using the previous kernel was fine. After reviewing the boot log (where -1 means second-to-last boot, -0 would be the last (successful) boot etc.): journalctl -k -b -1 it turned out there was a problem uploading firmware blob to my Radeon R7 370 (I use the standard open-source driver): kernel: [drm] radeon: 2048M of VRAM memory ready kernel: [drm] radeon: 2048M of GTT memory ready. kernel: [drm] Loading pitcairn Microcode kernel: radeon 0000:01:00.0: Direct firmware load for radeon/si58_mc.bin failed with error -2 kernel: [drm] radeon/PITCAIRN_mc2.bin: 31100 bytes kernel: si_fw: mixing new and old firmware! kernel: [drm:si_init [radeon]] *ERROR* Failed to load firmware! kernel: radeon 0000:01:00.0: Fatal error during GPU init Indeed, for my particular Radeon model the newer kernel tries to upload si58_mc.bin, but the file was missing. The solution was to get the file from https://people.freedesktop.org/~agd5f/radeon_ucode/, put it in /usr/lib/firmware/radeon and regenerate initramfs images: dracut --regenerate-all --force
  7. Had a few fruitful sessions with the new 90 mm refractor/Lunt 50 etalon setup: Animations (they take a while to load):
  8. Download from: https://github.com/GreatAttractor/imppg/releases/tag/v0.5.3 Bug fixes: Fixed filling the list of recently used settings under Windows
  9. Excellent! What kind of setup did you use?
  10. Sure. Riklaunim has even captured Barnard's Loop with the older, less sensitive DMK21: http://www.rkblog.rk.edu.pl/w/p/wide-field-imaging-dmkdbkdfk-cameras-and-cs-lens/ I've made a few attempts too with my planetary cameras (ICX445 and IMX136 sensors). Widefield only, with old M42 lenses, as I don't have any guiding gear. Exposure data in the links. (when on Astrobin, click the images for full size)
  11. I'd say it's worth it, you get almost twice the resolution (at the cost of not being able to see the whole disc at once this way, just a fragment). Note however that the image is still single-stackish, just like in Lunt 50, i.e. not too great a contrast, you have to look for a few seconds to start noticing fine structures (and fine they are! especially with big proms and sunspots boiling near the limb).
  12. With these particular scopes – not likely Here's the description of my mod: https://solarchatforum.com/viewtopic.php?f=9&t=19238 It’s completely non-destructive, you just need to get the adapter length right.
  13. Sure! All-automatic processing should work for a video like this; otherwise, you may have to select manual placement of reference points.
  14. New version 0.2.0 can be downloaded from https://github.com/GreatAttractor/stackistry/releases New features: Image alignment using the intensity centroid (useful for planets) Structure detection for better automatic placement of reference points Zoom function in image view widgets More controls for automatic reference point placement Displaying and exporting of frame quality data Generating the composite of best fragments of all frames Bug fixes: Fixed opening AVI files produced by FFMPEG Necessity is the mother of invention — the enhanced ref. point placement was needed for automatic stacking of lunar videos out of my new ATM Newt, without adding tens of points manually. The need for quality data frame export feature was pointed out by Joachim (RTJoe) from Solarchat, can be useful e.g. for comparing with an SSM (Solar Scintillation Monitor) output from a session. Finally, it is quite interesting to view the composite of best frame fragments. You can see some of this in the video tutorials I finally got around to making: https://www.youtube.com/watch?v=_68kEYBXkLw&list=PLCKkDZ7up_-VRMzGQ0bmmiXL39z78zwdE&index=1 https://www.youtube.com/watch?v=TEPmircIbuc&list=PLCKkDZ7up_-VRMzGQ0bmmiXL39z78zwdE&index=2 Subtitles should activate automatically. If your browser's preferred language is not English, you may have to turn them on manually.
  15. Download from: https://github.com/GreatAttractor/imppg/releases/tag/v0.5.2 Bug fixes: Fixed drawing of histogram and tone curve