2019y4 20200512 2100 mjaeger

 C/2019 Y4 Atlas may 12. At the end of the twilight I was able to take some very good images with a green filter. This shows a diffuse fragment at the beginning of the head. The bright fragment (B) shows a short ion tail as on May 10th. Measurements with Astrometrica show that B increased only slightly from May 9th to 12th. With radius 3 it is constant at 14m0, with radius 6 the values are 13.3 may 9, 13.1 may 10, 13.0 may 12 Regards Michael Jäger image 9x140 sec green 11"/2.2 RASA QHY600
cs Michael Jäger