2017tw13 20181020 hsato

Possible cometary activity of 2017 TW13

2017 TW13 (YTBE6EF) is an unusual object on a cometary orbit (q = 2.0 au, inclination 45 degrees, period 19 years).
I recovered it a week ago and found a coma, and a hint of tail northwards today.
Now it is around 18 mag, 2mag brighter than predicted.
The position was about 20" off from the ephemeris by mpc.