NASA’s TSIS-2 sunlight monitor passes tests

NASA reported November 2 that TSIS-2 passed vibration and thermal-vacuum tests this fall. Bloomboff has not independently verified the tests. Launch is targeted for early 2027. The mission would extend a continuous total solar irradiance record begun in 1978, helping improve climate predictions.⁠¹

Bloomboff's take

That’s a damn long sunlight ledger. Passing lab tests still isn’t reaching orbit.