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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. 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
    2. 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
    3. iDreamOfSushi‏ @FaizaFaria 27 May 2016
      Replying to @kchangnyt

      NEOWISE did not measure albedo, they measured asteroid size.

      1 reply 0 retweets 0 likes
    4. 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.

      1 reply 0 retweets 0 likes
    5. 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
    6. 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
    7. iDreamOfSushi‏ @FaizaFaria 27 May 2016
      Replying to @kchangnyt

      IR brightness is measured. All other properties are estimated. Important parameter estimates are calibrated.

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

      Right, diameter is not measured. It is calculated from thermal models to replicate IR brightness in the 4 bands, yes?

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

      Nothing wrong with 'better' or 'worse' thermal model as long as size is measured verifiably better. Myhrvold don't do that.

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

      Nathan is claiming that the model is “good” because they came up with all these arbitrary rules for the calibration.

      4 replies 0 retweets 0 likes
      Kenneth Chang‏ @kchangnyt 27 May 2016
      Replying to @kchangnyt @FaizaFaria

      But that it doesn't really work that well for the other 150,000 or so. Impossible to say for sure either way, right?

      5:52 PM - 27 May 2016
      1 reply 0 retweets 0 likes
        1. iDreamOfSushi‏ @FaizaFaria 27 May 2016
          Replying to @kchangnyt

          "Impossible to say" with certainty without measurement. Very much possible with measurements.

          0 replies 0 retweets 0 likes
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