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NASAWebb's profile
NASA Webb Telescope
NASA Webb Telescope
NASA Webb Telescope
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@NASAWebb

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NASA Webb TelescopeVerified account

@NASAWebb

NASA's James Webb Space Telescope will #UnfoldTheUniverse and show us things we've never seen before.

webb.nasa.gov
Joined April 2009

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    1. Knud Jahnke‏ @KnudJahnke 25 Sep 2017

      "James Webb will be so sensitive, it could detect the heat signature of a bumblebee at the distance of the moon". This is mind blowing!

      3 replies 1 retweet 6 likes
      Show this thread
    2. Knud Jahnke‏ @KnudJahnke 25 Sep 2017

      Source: https://nasa.tumblr.com/post/165546092409/webb-101-10-facts-about-the-james-webb-space …

      2 replies 0 retweets 1 like
      Show this thread
    3. Knud Jahnke‏ @KnudJahnke 25 Sep 2017

      I was asked if I checked this by @mpoessel. Well, now I did. Assumption: bumblebee reflects sunlight. ~Same brightness as candle. 1/n

      3 replies 0 retweets 2 likes
      Show this thread
    4. Leo Burtscher‏ @LeoBurtscher 25 Sep 2017
      Replying to @KnudJahnke @mpoessel

      Or directly: F_nu [Jy] = B_nu(10 micron, T bumblebee) * 2pi * solid angle bumblebee = 3 µJy -- easily detectable. https://jwst.stsci.edu/files/live/sites/jwst/files/home/instrumentation/technical%20documents/paper9.pdf …

      4 replies 0 retweets 1 like
    5. Markus Pössel‏Verified account @mpoessel 25 Sep 2017
      Replying to @LeoBurtscher @KnudJahnke

      But now it's on the moon, itself a reflective surface. What's the bumblebee s/n?

      1 reply 0 retweets 0 likes
    6. Leo Burtscher‏ @LeoBurtscher 25 Sep 2017
      Replying to @mpoessel @KnudJahnke

      Indeed. So within the PSF we have BB_sun * r * PSF * pi/4 * 4*pi/2 = 1.6 Jy. r = reflectivity at 10 µm ~ 0.1% http://www.sciencedirect.com/science/article/pii/S0032063303000175?via%3Dihub …

      1 reply 0 retweets 0 likes
    7. Leo Burtscher‏ @LeoBurtscher 25 Sep 2017
      Replying to @LeoBurtscher

      Leo Burtscher Retweeted Leo Burtscher

      So the SNR in front of the moon is 3e-6/sqrt(1.6) ~ 1e-6 which means, after all, that #JWST in fact cannot detect a bumblebee at the moon.https://twitter.com/LeoBurtscher/status/912402870003265537 …

      Leo Burtscher added,

      Leo Burtscher @LeoBurtscher
      Replying to @mpoessel @KnudJahnke
      Indeed. So within the PSF we have BB_sun * r * PSF * pi/4 * 4*pi/2 = 1.6 Jy. r = reflectivity at 10 µm ~ 0.1% http://www.sciencedirect.com/science/article/pii/S0032063303000175?via%3Dihub …
      3 replies 0 retweets 3 likes
    8. Knud Jahnke‏ @KnudJahnke 25 Sep 2017
      Replying to @LeoBurtscher

      Only at the dark side. Which it also shouldn't look at from L2 due to sun's opposition. So maybe during an eclipse, ... 1/2

      1 reply 0 retweets 1 like
    9. Knud Jahnke‏ @KnudJahnke 25 Sep 2017
      Replying to @KnudJahnke @LeoBurtscher

      ...which would need to be an earth-sun-eclipse b/c the moon is too small. Complicated. 2/2

      1 reply 0 retweets 0 likes
    10. Knud Jahnke‏ @KnudJahnke 25 Sep 2017
      Replying to @KnudJahnke @LeoBurtscher

      Ah, here's the documentation that shows that @NASAWebb can't look at the #moon as expected: https://jwst-docs.stsci.edu/display/JPP/Field+of+Regard+Considerations+for+Moving+Targets …

      2 replies 0 retweets 0 likes
      NASA Webb Telescope‏Verified account @NASAWebb 25 Sep 2017
      Replying to @KnudJahnke @LeoBurtscher

      Note that there isn't a "dark side" of the Moon - both near and far get sunlight. And no, the moon is too bright for us to observe.

      2:20 PM - 25 Sep 2017
      • 2 Retweets
      • 2 Likes
      • DARK SIGNAL Leo Burtscher Divine Tribal
      1 reply 2 retweets 2 likes
        1. Knud Jahnke‏ @KnudJahnke 25 Sep 2017
          Replying to @NASAWebb @LeoBurtscher

          Seen from L2 the Moon is at a forbidden solar elongation angle in the first place...

          0 replies 0 retweets 0 likes
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