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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 my APO, so lines are weaker. Intensity hasn't been corrected. I think that this comet was too low above the horizon to do it well. This is also the first light with a diffraction grating 300 l/mm used in the Low Spec 2. Slit position, PHD2 screen: Spectrum with stretched histogram, faint LP of my city is present in the background, 5x60s stack: I hope that I correctly substracted LP from the comet spectrum. The result obtained in the BASS software: We have carbon C2 bands, CN and strong emission of sodium doublet. Some lines are unidentified yet.
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 vertical absorption lines of the Earth's atmosphere, there are quite a few of them. Below two stacks of Na doublet area, resize 200%: Spectral profiles for Jupiter: Spectraf profiles for Saturn Rings: The result of calculations of the rotational velocity at the equator and comparison with data in the public literature: Result of calcutations Jupiter Saturn Rotational velocity 13.2 ± 1.3 km/s 10.5 ± 1.3 km/s Equatorial diameter 149890 km 128744 km Public literature Jupiter Saturn Rotational velocity 12.6 km/s 9.87 km/s Equatorial diameter 142984 km 120536 km The velocity of Saturn's rings is variable, the rings closest to the planet have the highest velocity, the furthest rings are the slowest. The calculated average velocity based on the recorded spectrum is 15.8 km/s. As an example, the velocity of the crumbs moving on the outside of the Cassini Break (ring A) is 17.5 km/s. Pretty close. I took half a pixel as a measurement error.
Looking for Qhy 163m camera for the next season's (hopefully) dark and clear nights. I am also interested for accessories (filters/motored wheel) if a suitable bundle would present itself. I would prefer the Qhy but Asi 1600 mm cooled, especially if it is version 3, would suit also. If you have an extra lying around or want to part with your current one, please contact. Paypal transactions only please. Thanks!
Hi guys, Took a little more data on this M42 image and I'll call this done for now, happy with all the dust on the background The camera picked up a lot of detail, even with all the fireplaces smoke that filled the air, I always end up my winter nights smelli'n like "Chouriço"... This is now comprised of 51x300 secs at gain:20 offset:100 USB traffic set to:5 Setup: SW ED80 with Altair Astro 0.8X reducer (f/6) Baader 7nm Ha filter EQ6 mount Guided with ASI120MM and 50mm guider Here on Flickr: https://www.flickr.c...eposted-public/ Cheers,