Just Ha possible because of twilight and moonlight

Object ID NGC 6888 Crescent Nebula, C27
Details 2020-05-08 22:44 UT –
Mag 7.4, size 18’x12′
Cygnus
Telescope 250mm f4.8 Newtonian
Camera Atik 460EX @-15C
Exposure(s) 15x300s Ha 1×1
darks, flats, bias
Capture APT
Processing APP, Photoshop