comet and spectroscopic observations on 11 may

a very clear night with very good transparancy, SQM was here 19.36, which is exceptional for this area on 8 km from Antwerp city. I observed 3 comets: C/2017 T2, C/2019 Y1 and C/2019 N1. Also object C2PJ842 mentioned on the PCCP as possible comet, i could detect this object (magn. 20.0). Unfortunately it was not possible for observing C/2019 Y4 due this comet was behind the trees of my neighboors. Also some spectra could taken of Be-stars: cx Dra, Alfirk, 25 Cyg and 28 Cyg