2017t2 20190803 rroberto

Very interesting is the comet C/2017 T2.

I observed it on the morning of August 4th from Frasso Sabino observatory at about 21/22 degrees high from the east-north-east horizon. The seeing was bad and I made 30 pictures from 20s. First mediated to groups of 3 and then added up.

You can see the tail and magnitude (estimated using astrometric and the stars of UCAC 4) using a radius of 8 pixels (the scale is 1".34/pixel with north up and east to the left) then a diameter of 21".4, it was 12.6 as seen from the image that placed.

There is also a faint curved tail.