naco_img_zpoint(7) on Linux
The text 333a801a205b, as Debian 9 (Stretch) shipped it.
Zero point computation recipe
Flags it lists
-
--bg_r1 -
--bg_r2 -
--check_im -
--dec -
--mag -
--pscale -
--ra -
--star_r -
--sx -
--sy