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Mars 2020 Mission, Perseverance Rover Launch

Discussion in 'SpaceX' started by doug, Jul 28, 2020.

  1. doug

    doug Administrator / Head Moderator

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    I didn't see it during the launch coverage, but in the post launch briefing they showed video of the craft separation. You can see it around the 30 second mark of the video I posted above.

    Screenshot_20200730-115655.png
     
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  2. bxr140

    bxr140 Active Member

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    Really cool frame or three on the massive recoil/oscillation at the base of the super long fairing.

    A couple seconds after fairing deploy you can see half of the load reactor deploy too. That's the silly ring they add to the top of the upper stage to manage the ginormous fairing's lateral motion.
     
  3. mongo

    mongo Well-Known Member

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    That "silly" ring is also part of the load sharing setup I mentioned.
    https://www.ulalaunch.com/docs/default-source/rockets/atlasv-cutaway.pdf
     
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  4. ecarfan

    ecarfan Well-Known Member

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    #24 ecarfan, Jul 30, 2020
    Last edited: Jul 30, 2020
    Now that Perserverance is on its way, not much is going to happen until the “7 Minutes of Terror” when the vehicle enters the Marian atmosphere and then (hopefully) lands softly at an impact speed of less than 2mph. Here is a NASA video about that process. This video is about the 2012 Curiosity landing process (the first time the technique was attempted, and it worked perfectly) but Perseverance will land the same way. Apparently the supersonic parachute has been slightly modified and the software has been tweaked to adjust for local variations in Martian gravity; Curiosity touched down at 1.4mph and the engineers had expected it to be at 1.7mph. They later ascribed that to the landing area have a tiny bit less gravitational pull then they predicted. Perseverance also has something Curiosity did not: “terrain-relative navigation.” A camera on the spacecraft will take pictures of the landscape and match them with its stored maps. That will help it pick out a suitably flat spot free of large rocks. (Credit: https://www.nytimes.com/2020/07/29/science/nasa-mars-perseverance-rover.html)

     
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  5. doug

    doug Administrator / Head Moderator

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  6. ggr

    ggr Expert in Dunning-Kruger Effect!

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    You can see the shadow of the smoke trail; at first I couldn't figure out what it was, thought it was a camera artifact.
     
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  7. Electroman

    Electroman Supporting Member

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    Look at the ice build up.. probably several cm think covering the whole outer shell top to bottom. And that is extra pounds it has to lift, not to mention the additional drag it induces.
     
  8. bxr140

    bxr140 Active Member

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    It falls off pretty quickly and also represents mass efficient propellant, so it’s an acceptable trade off.
     
  9. Electroman

    Electroman Supporting Member

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    #29 Electroman, Aug 8, 2020
    Last edited: Aug 8, 2020
    4 1/2 mins into the flight until the first stage separation much of the ice build exists.

    "mass efficient propellant": Didn't SpaceX pioneer the usage of super-cooled LOX? And I don't recall seeing any ice build up, or not this much.
     
  10. Grendal

    Grendal SpaceX Moderator

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    NASA video:
     
  11. Nikxice

    Nikxice Active Member

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