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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.
The July edition of the Binocular Sky Newsletter is ready. Astronomical darkness returns to the southern part of the UK this month, and we have:
* Yet another "promising" comet
* Asteroid Ceres
* Neptune and Uranus return
I hope this helps you to fill your evenings (actually, more likely pre-dawn mornings!) enjoyably.
To pick up your free copy, just head over to http://binocularsky.com and click on the Newsletter tab, where you can subscribe (also free, of course) to have it emailed each month, and get archived copies.