Post by @tal@lemmy.today

2026-09-30 03:27 UTC

I like its lines, but realistically, I don’t know what you’d use it for unless you need extremely high-resolution images. We know, from Trump’s probably-ill-advised tweet back in 2019, that we can do 10-centimeter resolution from reconaissance satellites like USA-224. en.wikipedia.org/wiki/USA-224 Perigee altitude: 270 kilometers (170 mi)[1] Apogee altitude: 986 kilometers (613 mi)[1] en.wikipedia.org/wiki/Lockheed_SR-71_Blackbird During missions, the SR-71 operated at high speeds and altitudes (Mach 3.2 at 85,000 ft or 26,000 m) The SR-71 operates at a tenth to a thirtieth USA-224’s altitude, so assuming comparable imaging systems (which I could believe) and that there aren’t stability or thermal issues (which I’d be less-certain of) it can get ten to thirty times the resolution of a USA-224-class satellite from the lower altitude. I’m not sure how much utility there is in reconnaissance to getting 1 cm or ⅓ cm resolution images instead of 10 cm.

Replies (2)

@Cocodapuf@lemmy.world 2026-09-30 06:00

realistically, I don’t know what you’d use it for unless you need extremely high-resolution images. Well, what does NASA do? I think it’s a pretty safe bet that NASA wants it to test something about aerodynamics at extremely high speeds. Perhaps they want it to deploy some experiment at mach 3. Sometimes you just don’t know if your simulation models are correct, and you need to try something in the real world. I suppose it’s also possible they want it to get some close up footage of a rocket during launch or reentry.

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@testaccount372920@piefed.zip 2026-09-30 06:23

I can think of a couple of reasons to use the SR-71 again. Concern that a crash in space could lead to a cascade of crashes, disabling all sattellites. (On demand) capacity. I could imagine that the SR-71 can cover an unplanned spot faster than sattellites. Also, with the wars in Ukraine and Iran they’re maybe finding out that they don’t have enough imaging capacity. The imaging angle, a plane can image almost horizontally, they can look under bridges, through windows etc. A ten times increased resolution could be useful for recognizing details, maybe it’s even good enough to recognize people though it might be pushing the limits of facial recognition. It’s also the kind of resolution where they can read some text, e.g. identifyers on shipping containers or military vehicles.

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