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An image of the Australian desert illuminates satellite pollution

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Re: An image of the Australian desert illuminates satellite pollution

#22

As someone who co-incidentally started dabbling in Astrophotography as a hobby in early 2019 before Starlink launched, back then you literally could capture a single 20-second exposure (on a very wide lens, so no obvious star trail/blur at that focal length due to the Earth's rotation), and get images with no satellites. Now (and even in 2021 it was getting hard to do that) it's impossible to do that, even with 10 se…

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I think it runs off a .mov or other video file, you add black frames, etc.

Re: An image of the Australian desert illuminates satellite pollution

#24

[flagged]

>Unpopular opinion: global internet access is more important than pretty pictures of the sky. You're right about one thing - It is an unpopular opinion. You're wrong about global internet access being more important than being able to take "pretty pictures" of the night sky. Global internet access has become a tool for homogenizing opinion. It has become the most useful tool for propagandists and others who would pus…

This is a regressive view. Developed countries profit from the educational nature of the Internet. We're all better off from having banked and shared common knowledge.

Re: An image of the Australian desert illuminates satellite pollution

#26
It is so polluted you need professional camera gear and processing of hundreds of photos together in order to show it. Get real. Internet access for poor, remote rural areas across the global is more important than convenient timelapse photography.

Re: An image of the Australian desert illuminates satellite pollution

#28

Just paint the satellites black?

Can't tell if you're joking or not, but SpaceX has indeed been collaborating with astronomical observatories to reduce the apparent magnitude (brightness) to ground for Starlink satellites. It's not as if the potential issues weren't apparent and reported on pretty early on, ie, [0] in summer 2020 before the network entered beta. It's not perfect and the period during orbit raising before the satellites enter operational orbits is more challenging, but very significant reductions have been achieved per recs, see for example "Starlink Gen 2 Mini Satellites Photometric Characterization" [1] in 2023 and "The Brightness of Starlink Mini Satellites During Orbit-Raising" [2] in 2024:

>When magnitudes are adjusted to a uniform distance of 1000 km the means are 4.58 and 7.52, respectively. The difference of 2.94 between distance-adjusted magnitudes above and below threshold implies that mitigation is 93% effective in reducing the brightness of orbit-raising spacecraft.

So there has been progress, though more may be possible particularly as Starship gives them more mass to work with for less money. That may bring new possibilities to spend mass on "cosmetic" purposes to shade and further reduce magnitude even if it contributes nothing to the core functionality. Same as more mass may allow regulators to feasibly require higher levels of redundancy and more margin for deorbiting in case of issues or at EOL.

Of course, that does leave older unmitigated working sats contributing to light pollution for the rest of their operational lifetimes, though worth noting that one of many major advantages for low-LEO/VLEO operation is that by design such lifetimes are much shorter, and in turn generation refresh will happen more quickly. Perhaps more importantly long term, there aren't as far as I know any actual international standards and agreements towards responsible brightness mitigation (or other issues like disposing of expended upper stages responsibly, standardized end-of-life deorbiting, etc). SpaceX has, for both PR and simple corporate self-interest reasons, been a pretty good actor so far even if they get a lot of attention for being the leading first mega constellation. But I really hope follow on efforts from other players can hit the ground running with magnitude reductions at least as good, and that SpaceX itself continues to improve (or at a bare minimum not backslide).

High bandwidth fully global comms is simply too valuable a capability to really imagine going back at this point. But that's no reason not to pursue reasonable compromise mitigations, and potentially some sort of funds to ultimately create far more orbital telescopes as well as part of the package taking full advantage of what upcoming cheap megalift will make possible.

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0: "Impact of Satellite Constellations on Optical Astronomy and Recommendations Toward Mitigations" | https://aas.org/sites/default/files/2020-08/SATCON1-Report.p...

1: https://arxiv.org/pdf/2306.06657

2: https://arxiv.org/pdf/2405.12007

Re: An image of the Australian desert illuminates satellite pollution

#29
post #16

"Stitching together 343 distinct photos," I don't doubt that this is a real problem for astronomers and photographers, but I feel like if you had to work that hard, it doesn't really make your case.

These photos are taken in pitch-black darkness.

You need to take a lot of exposures in order to get the data necessary to even see anything.

Re: An image of the Australian desert illuminates satellite pollution

#30

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Starlink and similar do not have the capacity for true global internet access.

They are suitable only for their current, niche markets e.g. rural areas.

If you truly want global internet access fibre is the best option.

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