4 ms·

I heard that it's within their expected budget of damage and has literally zero impact on any parameter of the telescope due to the deformable optics

baggy_trough 4y ago
I think that understates the case. Have you seen the calibration image after the impact?
- deelowe 4y ago
  My understanding is the strike happened while en route and the risk of strikes of similar severity is lower in final orbit.
  - baggy_trough 4y ago
    That is not correct because the damage is not present in the first calibration images that were released.
    - deelowe 4y ago
      You're right. Thanks for the correction.
- sillysaurusx 4y ago
  I haven’t. Mind linking? I suspected the damage was a little more important than people were saying, but it sounds like you might know of some evidence.
  - bckr 4y ago
    Probably talking about this[] from[]. I think it's overstated, though. The telescope seems to have a lot of redundancy and flexibility. [] https://cdn.mos.cms.futurecdn.net/jNgqXUj6dDVWbSvkw5ngMk-970-80.jpg.webp https://cdn.mos.cms.futurecdn.net/jNgqXUj6dDVWbSvkw5ngMk-970... [] https://www.space.com/james-webb-space-telescope-micrometeoroid-damage https://www.space.com/james-webb-space-telescope-micrometeor...
    - ThisIsMyAltFace 4y ago
      > When Webb's mission began, the affected C3 segment had a wavefront error of 56 nanometers rms (root mean square), which was in line with the 17 other mirror portions. > Post-impact, however, the error increased to 258 nm rms, but realignments to the mirror segments as a whole reduced the overall impact to just 59 nm rms. For the time being, the team wrote Webb's alignment is well within performance limits, as the realigned mirror segments are "about 5-10 nm rms above the previous best wavefront error rms values."
      - koheripbal 4y ago
        It sustained this strike - but more strikes like the one that happened are going to significantly reduce the lifetime of the telescope. There is no debating that that big strike was outside the model.
        topspin 4y ago
        > There is no debating that that big strike was outside the model. Yes it is. That means the model is wrong. Hopefully JWST doesn't devolve into a micrometeorite detector. That instrument could have been built and operated at far lower cost and one wonders if that shouldn't have been done beforehand.
        AprilArcus 4y ago
        It could be that the model is wrong, or it could be that the model is correct and the big strike was an outlier. Only time will prove.
    - baggy_trough 4y ago
      Yes, that's what I'm referring to. You don't consider that severe damage to a mirror segment? It looks like somebody shot it with a gun. It's unable to get properly back into alignment over the full segment.
      - 4y ago
  - replygirl 4y ago
    https://www.google.com/search?q=james+webb+damage+calibration+image&tbm=isch https://www.google.com/search?q=james+webb+damage+calibratio...
  - toastedwedge 4y ago
    Calibration image here[0]. According to the article, it still operates well within its parameters. Still feels like getting a ding on your new car though doesn't it? [0] https://www.space.com/james-webb-space-telescope-micrometeoroid-damage https://www.space.com/james-webb-space-telescope-micrometeor...

baggy_trough 4y ago

I think that understates the case. Have you seen the calibration image after the impact?

deelowe 4y ago
My understanding is the strike happened while en route and the risk of strikes of similar severity is lower in final orbit.
- baggy_trough 4y ago
  That is not correct because the damage is not present in the first calibration images that were released.
  - deelowe 4y ago
    You're right. Thanks for the correction.
sillysaurusx 4y ago
I haven’t. Mind linking? I suspected the damage was a little more important than people were saying, but it sounds like you might know of some evidence.
- bckr 4y ago
  Probably talking about this[] from[]. I think it's overstated, though. The telescope seems to have a lot of redundancy and flexibility. [] https://cdn.mos.cms.futurecdn.net/jNgqXUj6dDVWbSvkw5ngMk-970-80.jpg.webp https://cdn.mos.cms.futurecdn.net/jNgqXUj6dDVWbSvkw5ngMk-970... [] https://www.space.com/james-webb-space-telescope-micrometeoroid-damage https://www.space.com/james-webb-space-telescope-micrometeor...
  - ThisIsMyAltFace 4y ago
    > When Webb's mission began, the affected C3 segment had a wavefront error of 56 nanometers rms (root mean square), which was in line with the 17 other mirror portions. > Post-impact, however, the error increased to 258 nm rms, but realignments to the mirror segments as a whole reduced the overall impact to just 59 nm rms. For the time being, the team wrote Webb's alignment is well within performance limits, as the realigned mirror segments are "about 5-10 nm rms above the previous best wavefront error rms values."
    - koheripbal 4y ago
      It sustained this strike - but more strikes like the one that happened are going to significantly reduce the lifetime of the telescope. There is no debating that that big strike was outside the model.
      - topspin 4y ago
        > There is no debating that that big strike was outside the model. Yes it is. That means the model is wrong. Hopefully JWST doesn't devolve into a micrometeorite detector. That instrument could have been built and operated at far lower cost and one wonders if that shouldn't have been done beforehand.
        AprilArcus 4y ago
        It could be that the model is wrong, or it could be that the model is correct and the big strike was an outlier. Only time will prove.
  - baggy_trough 4y ago
    Yes, that's what I'm referring to. You don't consider that severe damage to a mirror segment? It looks like somebody shot it with a gun. It's unable to get properly back into alignment over the full segment.
    - 4y ago
- replygirl 4y ago
  https://www.google.com/search?q=james+webb+damage+calibration+image&tbm=isch https://www.google.com/search?q=james+webb+damage+calibratio...
- toastedwedge 4y ago
  Calibration image here[0]. According to the article, it still operates well within its parameters. Still feels like getting a ding on your new car though doesn't it? [0] https://www.space.com/james-webb-space-telescope-micrometeoroid-damage https://www.space.com/james-webb-space-telescope-micrometeor...