4 ms·

I don’t think starlink is likely to be a huge ecological disaster but I do weep for what it’s doing to our night sky. The beauty of the cosmos is now very obvio

I don’t think starlink is likely to be a huge ecological disaster but I do weep for what it’s doing to our night sky. The beauty of the cosmos is now very obviously polluted when viewed even with just the naked eye. You can see the starlink sats go by constantly if you go to a dark sky location. With a telescope or binoculars or worse yet, astrophotography, it’s inescapable.

mikem170 4y ago
I've dabbled with astrophotography, I've been out with the camera a couple times so far, and was prompted by your comment to do a bit of reading on the effects of these starlink satellites. The first useful bits I found described how most astrophotography stacking software would filter out a satellite trail, dropping outlier pixels which appear only on a single frame, but that crossing trails might complicate things, and also the less dim outer edges of trails, and trails passing near other objects in the sky, and that worst case would be having to manually paint pure black over the trails, but that might need to be done for 12, or 20, or 50, or 200+ frames being stacked... I wonder if there is a period of time in the middle of the night where these satellites are in the earth's shadow and would not reflect any light?
- MerelyMortal 4y ago
  I imagine it would take some work, but wouldn't it be possible to get the orbit information from one of those open source hobby satellite tracker websites and program the camera to close its shutter during those passes (or have the camera hooked up to a computer that monitors the website and tell the camera to close its shutter)?
  - mikem170 4y ago
    I assume something like you suggest would be possible. It's normal to want to be able to take dozens of long-exposure photographs, maybe even a couple/few hundred. Each exposure might be 10 seconds, 30 seconds, or 2+ minutes long, depending on your equipment. I usually have my camera take all the photos, but I could do this through a laptop, and could script the timing, assuming I had a good feed of the times that satellites will be interfering, and that there is enough time in between satellites to take the long-exposure photos. I'm not sure about varying the exposure times, like you maybe implied, closing the shutter when a satellite comes by. Usually the exposure time is chosen as the longest that the combination of your lens and star tracking mount can do without causing star trails or being overwhelmed by ambient light pollution, and is the same for every frame. Shorter exposures don't gather as much data/light as longer exposures, all things being equal. My first thought while working around satellite interference would be to stay out longer to get more long exposures. It might be the case where having different exposures in a set of stacked frames introduces noise or other unwanted artefacts, given that you would be combining dissimilar inputs. I'm not sure how often these satellites would be passing by and visible. The subject being photographed might be something large, like the milky way across most of the sky through a fish-eye lens, and you would need many of those 1-2 minute long-exposure windows without satellite interference for this idea to work. For a smaller subject, like a constellation, it might be the case where you need to also account for the position of the satellites, if there are too many to track based on time only.
buffet_overflow 4y ago
It's minor in the grand scheme of things I guess, but it does make me sad the night sky is being taken away like this without our consent or public input. Granted, if we put it to a vote, I'm not sure what I would expect from that anyway.
- mchusma 4y ago
  Going to space is important, and we should strive to fill the sky with space structures housing trillions of people. Yes, the consequence will be a changed view, but the upside is so high, orders of magnitudes more people than have ever existed, as well as spectacular new views.
  - noodlesUK 4y ago
    I completely agree, going to space is very important, I’m just sad that the satellites polluting the night sky are basically just one company (a company which is definitely doing some cool stuff). It’s not a state, or a collective representing humanity but a private enterprise controlled by one person.

mikem170 4y ago

I've dabbled with astrophotography, I've been out with the camera a couple times so far, and was prompted by your comment to do a bit of reading on the effects of these starlink satellites. The first useful bits I found described how most astrophotography stacking software would filter out a satellite trail, dropping outlier pixels which appear only on a single frame, but that crossing trails might complicate things, and also the less dim outer edges of trails, and trails passing near other objects in the sky, and that worst case would be having to manually paint pure black over the trails, but that might need to be done for 12, or 20, or 50, or 200+ frames being stacked... I wonder if there is a period of time in the middle of the night where these satellites are in the earth's shadow and would not reflect any light?

MerelyMortal 4y ago
I imagine it would take some work, but wouldn't it be possible to get the orbit information from one of those open source hobby satellite tracker websites and program the camera to close its shutter during those passes (or have the camera hooked up to a computer that monitors the website and tell the camera to close its shutter)?
- mikem170 4y ago
  I assume something like you suggest would be possible. It's normal to want to be able to take dozens of long-exposure photographs, maybe even a couple/few hundred. Each exposure might be 10 seconds, 30 seconds, or 2+ minutes long, depending on your equipment. I usually have my camera take all the photos, but I could do this through a laptop, and could script the timing, assuming I had a good feed of the times that satellites will be interfering, and that there is enough time in between satellites to take the long-exposure photos. I'm not sure about varying the exposure times, like you maybe implied, closing the shutter when a satellite comes by. Usually the exposure time is chosen as the longest that the combination of your lens and star tracking mount can do without causing star trails or being overwhelmed by ambient light pollution, and is the same for every frame. Shorter exposures don't gather as much data/light as longer exposures, all things being equal. My first thought while working around satellite interference would be to stay out longer to get more long exposures. It might be the case where having different exposures in a set of stacked frames introduces noise or other unwanted artefacts, given that you would be combining dissimilar inputs. I'm not sure how often these satellites would be passing by and visible. The subject being photographed might be something large, like the milky way across most of the sky through a fish-eye lens, and you would need many of those 1-2 minute long-exposure windows without satellite interference for this idea to work. For a smaller subject, like a constellation, it might be the case where you need to also account for the position of the satellites, if there are too many to track based on time only.

buffet_overflow 4y ago

It's minor in the grand scheme of things I guess, but it does make me sad the night sky is being taken away like this without our consent or public input. Granted, if we put it to a vote, I'm not sure what I would expect from that anyway.

mchusma 4y ago
Going to space is important, and we should strive to fill the sky with space structures housing trillions of people. Yes, the consequence will be a changed view, but the upside is so high, orders of magnitudes more people than have ever existed, as well as spectacular new views.
- noodlesUK 4y ago
  I completely agree, going to space is very important, I’m just sad that the satellites polluting the night sky are basically just one company (a company which is definitely doing some cool stuff). It’s not a state, or a collective representing humanity but a private enterprise controlled by one person.