The trail of the Zenit-2 booster belonging to Okean-O, a Ukrainian earth resources radar satellite. It is crossing leftward through a hazy sky, past the "tail" stars of Ursa Major.

USSPACECOM Catalog No. 25861; Int'l Designation Code 1999-039-B.
Magnitude 1.6; photographed at 05:41 at altitude 66°, azimuth 286°WNW, in Ursa Major.
Source: heavens-above.com