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PakledHostage

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  1. Enhanced video shows dust being kicked up during Ingenuity's flight:
  2. 11:00 Pacific Daylight Time (1800 UTC) news conference link: (Sadly, will probably also including introduction by overdone PR lady™...)
  3. A media briefing about the Ingenuity helicopter will start in about 45 minutes from the time of this writing:
  4. I caught a glimpse of this during the tribute montage at the end of the briefing that I linked to above. I'm surprised it didn't make bigger headlines (it impresses me, anyway): The cliff face on the left (The Eiger's North Face in Switzerland) that the red Perseverance logo is projected onto is over 5000 vertical feet high. All three peaks that have images projected onto them (The Eiger, Jungfrau and Mönch) exceed 13,000 feet (~4000m) in height. This would have been quite the sight to see!
  5. Another news conference going live in about 50 minutes of this writing:
  6. Speaking of nerds... I went back and refined my estimate of Perseverance's entry trajectory. I initially went with the simplifying assumption that the path between data points was linear (rather than hyperbolic) and that the speed over that distance was just the average of the speeds at the two data points. Unfortunately, the solution is quite sensitive to the angular distance between the data points used in the system of equations, so the small error introduced with that assumption turns out to be significant. That assumption did provide a good seed value for a couple of rounds of iterations
  7. I recall that Bombardier tried active noise cancellation in the cabin of the Dash-8 Q400 aircraft, but it struck me more as a gimmick... and we're getting off topic.
  8. That thing really is going down like a greased piano... no messing around.
  9. And admittedly not a planet, but I recall that Huygens recorded audio on Titan?
  10. So I nerded out yesterday evening and attemped to compute the hyperbolic trajectory that Perseverance followed to the entry interface. I used the data that was shown on mission control's readouts in the mission control livestream. I ended up having to make some simplifying assumptions but I arrived at an eccentricity of about 1.3 and a periapsis point about 130km below the Martian surface. The entry interface angle worked out to about 18 degrees. That's a bit steeper than the value of ~15 degrees that I heard quoted during the livestream. The data from the early part of the entry in the livest
  11. Post landing briefing going live shortly (they seem to be running late):
  12. Livestream starts in just over 5 minutes. Already over 1/2 million people waiting.
  13. Interestingly, Al Chen, JPL's Entry Descent and Landing team lead said yesterday during the news conference that it is a misconception that the sky crane hovers. He said that it only actually hovers for about a second. Edit: I should add that I'm really excited to eventually see the footage from the EDL cameras. We're all probably imagining how the landing looks, but I expect that the real thing is a lot more dynamic and scary. For example, I didn't realize what a "sucide burn" landing the Apollo landings were until I watched the documentary "Apollo 11" with it's overlaid altitude
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