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This photo was doing the rounds a few days back showing starlink interfering with ground-based space photography: https://twitter.com/djulik/status/128605369595

This photo was doing the rounds a few days back showing starlink interfering with ground-based space photography: https://twitter.com/djulik/status/1286053695956881409 https://twitter.com/djulik/status/1286053695956881409 Also: https://en.wikipedia.org/wiki/Space_debris https://en.wikipedia.org/wiki/Space_debris

Craighead 6y ago
That image is already stacked, there is no way that photographer couldnt remove those trails with the data they had.
seastonATccs 6y ago
The photo was disingenuous. Astronomers stack photos to remove interference. The photographer did the exact opposite.
- kerng 6y ago
  Isnt this just using long exposure?
  - catalogia 6y ago
    No. A single long exposure would only show maybe one or two of those satellites. That's numerous exposures stacked on top of each other, such that every satellite visible in any of them is in the final result. This is completely backwards from how photo stacking is meant to be done (it's meant to remove satellites not visible in all of them.)
    - kerng 6y ago
      Very interesting, thanks for sharing this. This indeed should be pointed out clearky by whomever creates such images - seems quite manipulative using this to make a point.
- wincent 6y ago
  I don't know about how the photo was originally presented, but the tweet that I linked explicitly says the frame is "17 30-second images of the comet added up", so it's hardly disingenuous. The impact of Starlink on astronomical observation is in dispute and by no means is a settled matter: https://en.wikipedia.org/wiki/Starlink#Criticism https://en.wikipedia.org/wiki/Starlink#Criticism
  - cthalupa 6y ago
    He's saying the photographer specifically stacked the frame to increase the interference of the satellites. The same basic technique can be used in either direction - astronomers already use it to remove the thousands of satellites and other causes of interference in the night sky. https://www.youtube.com/watch?v=mgMZa6G-q34 https://www.youtube.com/watch?v=mgMZa6G-q34 - a basic example using it to remove ISO noise Edit: Actually, you can even see some satellites in the shot when he sets the layers to 'lighten' that are totally gone when he finishes the stacking.

Craighead 6y ago

That image is already stacked, there is no way that photographer couldnt remove those trails with the data they had.

seastonATccs 6y ago

The photo was disingenuous. Astronomers stack photos to remove interference. The photographer did the exact opposite.

kerng 6y ago
Isnt this just using long exposure?
- catalogia 6y ago
  No. A single long exposure would only show maybe one or two of those satellites. That's numerous exposures stacked on top of each other, such that every satellite visible in any of them is in the final result. This is completely backwards from how photo stacking is meant to be done (it's meant to remove satellites not visible in all of them.)
  - kerng 6y ago
    Very interesting, thanks for sharing this. This indeed should be pointed out clearky by whomever creates such images - seems quite manipulative using this to make a point.
wincent 6y ago
I don't know about how the photo was originally presented, but the tweet that I linked explicitly says the frame is "17 30-second images of the comet added up", so it's hardly disingenuous. The impact of Starlink on astronomical observation is in dispute and by no means is a settled matter: https://en.wikipedia.org/wiki/Starlink#Criticism https://en.wikipedia.org/wiki/Starlink#Criticism
- cthalupa 6y ago
  He's saying the photographer specifically stacked the frame to increase the interference of the satellites. The same basic technique can be used in either direction - astronomers already use it to remove the thousands of satellites and other causes of interference in the night sky. https://www.youtube.com/watch?v=mgMZa6G-q34 https://www.youtube.com/watch?v=mgMZa6G-q34 - a basic example using it to remove ISO noise Edit: Actually, you can even see some satellites in the shot when he sets the layers to 'lighten' that are totally gone when he finishes the stacking.