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kchangnyt's profile
Kenneth Chang
Kenneth Chang
Kenneth Chang
@kchangnyt

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Kenneth Chang

@kchangnyt

Science reporter at the New York Times. Pluto, dinosaurs, NASA, viral math & more...

New York, NY
nytimes.com/by/kenneth-cha…
Joined April 2014

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    1. Kenneth Chang‏ @kchangnyt 10 Sep 2019

      The Vikram lander has been found, but the odds that it is in working condition are long. Doppler data indicate it landed at more than 110 miles per hour.https://www.nytimes.com/2019/09/10/science/india-chandrayaan-2-vikram.html …

      20 replies 79 retweets 216 likes
    2. Dr. Anita Sengupta  🚀‏ @Doctor_Astro 11 Sep 2019
      Replying to @kchangnyt

      IF the lander is intact & titled, as stated, it is highly unlikely that is came down, presumably with some horizontal velocity component at 110 mph. Those two things are in conflict with eachother. Doppler data is good for state changes not precise trajectory reconstruction.

      2 replies 2 retweets 6 likes
    3. Kenneth Chang‏ @kchangnyt 12 Sep 2019
      Replying to @Doctor_Astro

      The ISRO statement does not say intact and tilted. (Only an unnamed official said that.) We haven’t seen any photos from the orbiter at 100 km.

      2 replies 0 retweets 0 likes
    4. Dr. Anita Sengupta  🚀‏ @Doctor_Astro 12 Sep 2019
      Replying to @kchangnyt

      Hence the word IF. But your article is also based off of data from an unofficial source, an independent team monitoring a signal. So both unofficial sources appear to be in conflict with eachother.

      1 reply 0 retweets 2 likes
    5. Kenneth Chang‏ @kchangnyt 12 Sep 2019
      Replying to @Doctor_Astro

      Yes, which is why I wrote the rest of the article about how spacecraft control systems generally are unable to recover from a major unexpected anomaly during landing. It would be incredible (and wonderful!) if Vikram made it to the surface intact.

      1 reply 0 retweets 0 likes
    6. Dr. Anita Sengupta  🚀‏ @Doctor_Astro 12 Sep 2019
      Replying to @kchangnyt

      More info is needed to draw conclusions. Doppler data is good for change in speed not absolute, certainly as these these levels. So using their conclusion on impact speed IM(expert)O is inaccurate.

      2 replies 0 retweets 0 likes
      Kenneth Chang‏ @kchangnyt 12 Sep 2019
      Replying to @Doctor_Astro

      Doppler gives you line-of-sight velocity, not just acceleration, correct?

      8:22 AM - 12 Sep 2019
      0 replies 0 retweets 0 likes

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