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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 27 May 2016
      Replying to @FaizaFaria

      NEOWISE is wildly wrong at times too. Would be amazing if it weren’t. It’s assuming spherical asteroids + fudge factors.

      2 replies 0 retweets 0 likes
    2. iDreamOfSushi‏ @FaizaFaria 27 May 2016
      Replying to @kchangnyt

      Do you have an example of NEOWISE being wildly wrong? Anything like this guy saying 39x34km asteroid is actually 6.6km?

      1 reply 0 retweets 0 likes
    3. Kenneth Chang‏ @kchangnyt 27 May 2016
      Replying to @FaizaFaria

      Al the Elder mentioned asteroids with NEOWISE albedos of ~1.0. No one thinks they are really that bright.

      2 replies 0 retweets 0 likes
    4. iDreamOfSushi‏ @FaizaFaria 27 May 2016
      Replying to @kchangnyt

      Specifically: any example of NEOWISE measurement of the size of a known size asteroid being wildly wrong? One example?

      1 reply 0 retweets 0 likes
    5. Kenneth Chang‏ @kchangnyt 27 May 2016
      Replying to @FaizaFaria

      1. Their own claim is error more than 10% half of the time,

      1 reply 0 retweets 0 likes
    6. Kenneth Chang‏ @kchangnyt 27 May 2016
      Replying to @kchangnyt @FaizaFaria

      2. They calibrated fudge factors to known asteroid sizes, so they should be close, right? Would really like someone to explain.

      1 reply 0 retweets 0 likes
    7. Kenneth Chang‏ @kchangnyt 27 May 2016
      Replying to @kchangnyt @FaizaFaria

      3. I would say an albedo of 1.0 would likely be “wildly wrong.” But can’t check independently.

      4 replies 0 retweets 0 likes
    8. iDreamOfSushi‏ @FaizaFaria 27 May 2016
      Replying to @kchangnyt

      Albedo 1 means perfectly reflective, 0 means perfectly black. Myhrvold complains that NWOWISE team does'nt account for albedo. /2

      1 reply 0 retweets 0 likes
    9. Kenneth Chang‏ @kchangnyt 27 May 2016
      Replying to @FaizaFaria

      I know def of albedo. You think the NEOWISE albedo is genuine or likely wrong?

      2 replies 0 retweets 0 likes
    10. iDreamOfSushi‏ @FaizaFaria 27 May 2016
      Replying to @kchangnyt

      NEOWISE did not measure albedo, they measured asteroid size.

      1 reply 0 retweets 0 likes
      Kenneth Chang‏ @kchangnyt 27 May 2016
      Replying to @FaizaFaria

      Mainzer said they fit observations to 4 parameters: diameter, albedo, 3-micron albedo and beaming. I don’t know what beaming is.

      5:15 PM - 27 May 2016
      1 reply 0 retweets 0 likes
        1. New conversation
        1. iDreamOfSushi‏ @FaizaFaria 27 May 2016
          Replying to @kchangnyt

          ... and then calibrated using known size (diameter) measurements, so that the rest goes into what you call 'fudge factor'.

          1 reply 0 retweets 0 likes
        2. Kenneth Chang‏ @kchangnyt 27 May 2016
          Replying to @FaizaFaria

          So why is this paper "Preliminary Albedos and Diameters”? http://bit.ly/1VmpCVA  Both diameters & albedos are calculated, yes?

          3 replies 0 retweets 1 like
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