Live data from Hacker News

Can You Find the Comet?

apod.nasa.gov

41–50 of 119 posts

Re: Can You Find the Comet?

#41

Why are satellite trails not continuous lines Is the camera exposure taking a few seconds of break between takes that get stacked later with some "missing" moments in between?

I am guessing, but I think it likely has to do with the shape and orientation of the satellite with respect to the sun and the camera. Depending on the relative positions, the brightness reflected off the satellite and reaching the camera will change over time.

Re: Can You Find the Comet?

#42
I, a taxpayer, would rather have a cellphone signal in a remote location than lots of amazing pictures of a comet. And I just don't see a solution or compromise that could work. The utility of neat picture vs full cell signal in a Montana canyon cannot be won by taking more pictures and showing me the problem. I made my decision already.

Re: Can You Find the Comet?

#43

I, a taxpayer, would rather have a cellphone signal in a remote location than lots of amazing pictures of a comet. And I just don't see a solution or compromise that could work. The utility of neat picture vs full cell signal in a Montana canyon cannot be won by taking more pictures and showing me the problem. I made my decision already.

Why gaze up at the vast cosmos when we can stare down at a little screen

Re: Can You Find the Comet?

#44

I, a taxpayer, would rather have a cellphone signal in a remote location than lots of amazing pictures of a comet. And I just don't see a solution or compromise that could work. The utility of neat picture vs full cell signal in a Montana canyon cannot be won by taking more pictures and showing me the problem. I made my decision already.

How is it relevant that you're a taxpayer?

Re: Can You Find the Comet?

#45

I, a taxpayer, would rather have a cellphone signal in a remote location than lots of amazing pictures of a comet. And I just don't see a solution or compromise that could work. The utility of neat picture vs full cell signal in a Montana canyon cannot be won by taking more pictures and showing me the problem. I made my decision already.

How is it relevant that you're a taxpayer?

https://www.cnbc.com/2020/12/07/spacex-starlink-wins-nearly-...

Re: Can You Find the Comet?

#46
post #43

I, a taxpayer, would rather have a cellphone signal in a remote location than lots of amazing pictures of a comet. And I just don't see a solution or compromise that could work. The utility of neat picture vs full cell signal in a Montana canyon cannot be won by taking more pictures and showing me the problem. I made my decision already.

Why gaze up at the vast cosmos when we can stare down at a little screen

Why have cheap radio safety when you can die under the stars?

Re: Can You Find the Comet?

#48

Why are satellite trails not continuous lines Is the camera exposure taking a few seconds of break between takes that get stacked later with some "missing" moments in between?

My time to shine! I've spent yesterday morning to track the photo down and answer this question. The APOD description is lacking. Yes, this was an exaggerated stack of 153 four-second exposures (the rejection map of the satellite trails was added on top of the image), and the gaps happened when the camera took its time to save between two exposures.

Here is a link to the original photo and it's description (German) by Uli Fehr: https://www.facebook.com/groups/Nachtfotografie/posts/264063...

Re: Can You Find the Comet?

#49
post #28

Why are satellite trails not continuous lines Is the camera exposure taking a few seconds of break between takes that get stacked later with some "missing" moments in between?

I'm not aware of a digital camera that can take a 10 minute continuous exposure, but maybe there are special astronomy cameras that can?

[deleted]

Re: Can You Find the Comet?

#50
post #27

I fear this is only the start of it. A minimum of 3-4 constellations more will probably be launched in the near future (Russia, China, EU). Their obvious dual-use nature makes them tempting, and a military target if a large conflict will take place in the near future. I hope their lower orbit will help any space junk burn up fast.

If you blow up a satellite, half of it will end up going slower and half will go faster. The slower bits will probably burn up nicely, but the faster bits will just elevate their orbit.

It'll elongate the orbit, which is a bit better of a scenario than elevating it wholesale.
Post reply on HN