Finding a million asteroids!
Joined January 2012
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- Followers 11,370
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101 Photos and videos
Jun 10
Fixed radars are the first target in a conflict. Keeping situational awareness requires mobile deployable sensors.
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May 20
If you need to propagate many state vectors and predict the sky position, magnitude, rates etc for an object in space, the @b612foundation can help you.
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May 20
Our new ephemeris propagation service is now available at b612.ai/adam-platform/epheme…
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Apr 10
The Shuttle simulator had no way to simulate the g forces, but the Russians had a simulator in a huge centrifuge. So if you screwed up and did a 9 g reentry, you actually had the pleasure of feeling that in the centrifuge. Good times!
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Apr 10
If you weren't careful about how steep your skip was, you could pay a big penalty in terms of g forces.
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Apr 10
Skipping off the atmosphere can cause your next entry into the atmosphere quite steep, which means very high g forces.
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Apr 10
If you come in too steep and have your lift vector pointed up, you can "skip" off the atmosphere and climb back upwards into very thin atmosphere which if you are not careful can put you into thin enough air so you have very little steering ability.
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Apr 10
Of course the Shuttle had much more lift to drag ratio and so could steer much further cross range if needed.
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Apr 10
We used to train to fly reentry manually in the Soyuz as well as Shuttle. The same principle of rolling to control drag and cross range to end up at the target landing spot was used.
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Apr 10
Like all capsules, there is a small amount of lift vector which is used to steer both cross range as well as the angle at which they dig into the atmosphere. Both are controlled by rolling the vehicle left or right.
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Apr 7
I never got tired of watching the Earth from space!
They had to cover the window on the Earth facing-side on Orion so I guess this already happened lol
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Ed Lu retweeted
Mar 30
LeoLabs detected a fragment creation event involving SpaceX Starlink 34343 on 29 March 2026.
Learn more. ⤵️
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Mar 14
Well deserved @kchangnyt ! He is consistently one of the best writers out there. Not just science.
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Mar 6
Can we can divert 2024YR4 to hit the Moon? No, the last kinetic impactor launch opportunity is in 2028, and would make the asteroid arrive sooner in 2032. The Moon on Dec 22, 2032 is waning, so this moves the asteroid even further from both the Moon and Earth.
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Mar 6
Range of potential asteroid 2024YR4 trajectories all missing the Moon on Dec.22, 2032.
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Mar 6
Let's take a moment to appreciate that our measurement of the current position of asteroid 2024YR4 is known to within 7km, and the velocity to within 1.2 mm/sec!
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Mar 6
Some more detail: those are the RMS velocity and position dispersions of the current state vector. This is not from a single measurement, but from fitting the state vector through observations spanning 15 months.
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Mar 5
The JWST obs of 2024YR4 required multiple hours long exposures. JWST tracked the asteroid, giving trailed images of background stars. The uncertainty in the measurement was calculated by analyzing the trailed stars together with the size of the asteroid image spread. Nice work!
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