Hotsat-2 lifts off in march with a thermal gaze that pierces roofs and reactor domes
On 29 March 2026 a Falcon 9 will vault out of Vandenberg carrying a British shoebox that can watch you run a bath from 500 km overhead. The box is HotSat-2, the first of an eight-satellite thermal constellation built by London start-up SatVu, and it sees in wavelengths your own skin emits. Translation: walls become windows, roofs turn to glass, every factory, barracks and enrichment hall on Earth leaks a heat signature it can sample every two hours.
Why this is not just another pretty infrared picture
NASA’s Landsat 9 resolves 100 m per pixel; HotSat-2 resolves 3.5 m. That jump is thirty-fold, close enough to watch the cooling fins of a gas-compressor station blush when engineers throttle output. Landsat revisits the same spot once every sixteen days; SatVu promises a pass by breakfast and another after dinner. The data stream lands in the same JSON feed traders already scrape for ship-location pings, so a hedge fund can clock a clandestine Saudi refinery shutdown before Riyadh files an official notice.
The military maths is juicier. Five Eyes partners—US, UK, Canada, Australia, New Zealand—have underwritten the first two years of imagery. SatVu CEO Anthony Baker showed me a slide: a Qatar LNG train before and after the 2019 drone skirmish. Pixel-for-pixel heat loss revealed which cryogenic tank had ruptured, giving insurers the excuse they needed to freeze payouts. “Imagine that granularity over Natanz or Bushehr,” Baker grins, and the room of analysts does not need the spelling out.
How the sensor cheats physics
Standard micro-bolometers top out at 640×512 pixels and drown in their own noise. SatVu licensed a staggered-read architecture from a defunct European weather mission, then added a cryo-cooler the size of a Red Bull can. The focal plane now sits at 55 K, low enough to discriminate 0.05 °C deltas through a roof that is already radiating at 285 K. Signal-to-noise climbs 14×, letting onboard GPUs run edge inference instead of dumping raw gigabytes to the ground. Translation: the satellite decides something is weird before humanity does.
Launch cost? $3.4 million for the ride-share slot, peanuts next to the $195 million Series B SatVu closed in January. Baker insists commercial customers—insurers, grid operators, carbon auditors—will outspook spooks by 2027. He may be right: EU carbon-market fraud investigators have already pre-ordered quarterly scans of every steel plant from Dunkirk to Donetsk.
The china angle no one puts on a brochurewhile satvu courts esg officers, beijing is lofting its own 2 µm free-space laser links that can squirt the same thermal cubesats’ data from beijing to tierra del fuego at 100 gbps without ever touching an undersea cable. the west just got a new eye; the east just got a new optic nerve. whoever stitches raw imagery to low-latency downlink first owns the premium pricing tier.
meanwhile, starlink’s 6,000-busybody constellation already hosts optical inter-satellite links. add a thermal payload the size of a shoebox and musk could flip a switch to give every ukrainian battalion a live heat map of russian trench stoves. satvu’s exclusivity window closes the moment a rideshare broker offers the same slot to the next start-up with a soldering iron and a dream.
bottom line
After March, secrecy will carry a heat signature, and heat no longer hides. If you run a reactor, a data centre or a cocaine greenhouse, your roof is already talking. The only question is who is listening—and how much they will charge to keep quiet.