Delta 183 had a satellite s aka Delta Star ds to test sensor tech. Ds carried a #thermographic camera, #infrared imager and photometers covering several visible, uv bands, laser detector.
s observed ballistic missile launches, released liquid propellant as counter to detection.

Thanks Max Ritter for sharing open source DIY #thermographic camera on #HackadayIO: https://t.co/1L24gLipf2 https://t.co/hwikgqaF30 source: https://twitter.com/hackaday/status/886488187975106561