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About Bajastro

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    Astronomy (spectroscopy, photometry, variable stars), optics, mountain tourism, distant observations
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    Mielec, Poland

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  1. The signaling LED has been powered together with the RELCO spectral lamp. Electronics inside: This device is powered by 230V, 2x47k Ohm resistors reducing the current intensity are in the plug from the cable.
  2. Yesterday I analysed a material containing almost 100 movies. 89 stacks were available for further processing. Movies were recorded on 27th of October 2020 from 20:40 to 22:27 UT. Below are animations showing the movement of Mars' moons: Phobos moves in an arc on the right, Deimos moves away from Mars on the left. On the right, Mars is "approaching" the star 2MASS J01051472+0444422 (Gaia EDR3 2552047650065811968) with a magnitude of V= 13.2 mag, and actually Mars is moving retrograde against the background of the stars Equipment: SCT C8", kamera ZWO ASI 120MM Mini, ES B
  3. More than a year has passed since the construction of the Low Spec spectrograph in version 2.0 provided by the author of the project (@Paul Gerlach). The project provided for the purchase of a ready-made module for illumination of the slit. From the beginning, I missed a decent calibration module and slit illumination. But why buy something for almost PLN 100, when you can illuminate the slit while building a spectrum calibration module and add additional functionality. Everything is great on the "project": Inside the device: But the electrical diagram I drew was
  4. I choose several of the best my photos of Mars and I prepared an animation based on Łukasz Sujka's tutorial. I struggled the most with map assembly in Gimp 2: I'm still waiting for good weather to photograph the area from Olympus Mons near the center of the planet's disc. Animation prepared in WinJUPOS for the date 2020-10-13: Equipment: Celestron C8 (SCT 8" F/10), ES Barlow 2x, Gso dark red filter (#29), ASI120MM Mini, HEQ5 mount.
  5. Mars is already slowly moving away from Earth, there is still a month of good visibility allowing you to observe many surface details. I found some time and collected the best photos from among a dozen photo sessions devoted to Mars. The planet was closest to Earth on the 6th of October.
  6. Thank you all. Last night after 3 cloudy weeks I photographed Mars with his moons: Moons: 100% from 60 seconds movie, frames 1s, high gain used. Planet: 10% from 120 seconds movie.
  7. On 3-rd of September, just before sunset, I set up my equipment, aimed the telescope towards the zenith, set the spectrograph on the double sodium line and every now and then ran a series of photos, adjusting the exposure time (30-120 s) and gain. At the end it was so dark that the gain had to be increased almost to "what the factory gave". I was not sure if we would be able to register anything at the resolution of 1800 l/mm holographic diffraction grating, slit with 40 μm wide. I also tracked the height (the depth of the sun below the horizon). I read in some publications that when the
  8. Mars was taken at night between 20:57 and 22:29 UTC. Equipment used: Celestron SCT C8, Barlow 2x, GSO #29 (dark red), ASI120MM Mini, HEQ5 mount. Animation was prepared from 20 images with drizzle 150% (the best 10% of frames from 60-second movies): One of the best images from 21:55UT:
  9. Great result, Robin. Which telescope did you use?
  10. Last night I recorded again the comet's head spectrum. NEOWISE has weakened significantly. There was a big change in 5 days. No sodium NaD emission. This comet is more green due to emission in the C2 Swan bands. Comparison below:
  11. Today after the midnight I recorded the spectrum of C/2020 F3 (Neowise). I couldn't change new diffraction grating (300 l/mm) before the midnight in my Low Spec 2 spectrograph. I have printed second unmodified mounting for grating and I had to use it, because dispersion angles are different than the 1800 l/mm diffraction grating. It was also necessary to assemble and run the setup. Not all lines were identified, the spectrum is different than spectra published on the internet. The violet range is worse due to the poor correction of chromatic aberration in achromatic lenses in my Low Spec and
  12. Venus in extremely phase observed 7 days ago. Used equipment: APM APO 107/700, dark red filter GSO #29, Barlow ES 2x, ASI120MM mini on HEQ5 mount. 30% best frames from 1 min movie: Venus illumination was only 0.3%, angular diameter 57.6", angular elongation from Sun 4* 23'. Unfortunately, in such conditions many shiny particles floating in the air were observed, for example:
  13. @Jack Martin I'm sorry for late answer. I don't have this book. I use Bass Project 1.9.9 - version is marked on the right side on the each spectrum (light gray color).
  14. Few days ago I decided to observe the spectra around Na lines for Jupiter and Saturn. I had a little time and some problems with Bluetooth communication. It took me about 30 min. About 3 am the sky was getting brighter. I set 20 μm slit of my Low Spec spectrograph along the equator: These images were taken few years ago. 1, 2, 3 - positions of spectral profiles The goal was to record the impact of planetary rotation on the shape of spectral lines. Interestingly, the spectra contain not only the inclined lines created due to the Doppler effect. There are also visible vert
  15. Thank you, the LowSpec capabilities are impressive. The resolution is similar to SQUES Echelle spectrograph results. I am still thinking about how to improve the guiding module in my spectrograph.
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