Fixed criteria:
Target H ≥ 22 mag.
Target flybye no more then 30 days ago and no later then in 14 days at distance 75 LD or less.
Target altitude ≥ 20° above horizon.
Filter rules:
Target apparent magnitude
or brighter.
Target galactic absolute latitude
° or more.
Darkness:
Daylight
Civil twilight/dawn
Nautical twilight/dawn
Astronomical twilight/dawn
Night
Moon below horizon or illuminated of
% or less.
TIME COND SPEED ALT V Δ SOT MOT ☽ b 3σ UT "/sec ° mag LD ° ° % ° "