comet and spectroscopic observations on 11 april

the observation conditions are quite good with an SQM of 19.0 (which is already very good for my observation site) with the 0.4-m f/3.8 newton telescope some comets were observed : 10P, 246P, C/2017 T2, C/2019 Y4. With the C11 a number of spectra were simultaneously recorded with the LHiResIII spectrograph: phi Leo, HD 50763 and 53 Boo.

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