I think you could earn at least a little money back on the development/manufacture of such a product if you found some commercial applications.
Can I get some of that for my target gun sights?
Study: ultra-black coating could reduce satellite light pollution
31–40 of 56 posts
Re: Study: ultra-black coating could reduce satellite light pollution
#32[deleted]
Re: Study: ultra-black coating could reduce satellite light pollution
#33unless they can make it weightless there will be no incentive to use it for anything to do with space
Re: Study: ultra-black coating could reduce satellite light pollution
#34There’s a funny amount of beef around using it in art, you have Anish Kapoor who bought exclusive rights to use Vantablack artistically and man of the people Stuart Semple offering his versions Black 1.0, 2.0, 3.0, 4.0 getting ever blacker.
Which is all a dumb marketing stunt because it was never a pigment artists could paint with anyway.
People have made art with the stuff.
Re: Study: ultra-black coating could reduce satellite light pollution
#35Sounds like what my eye doc says when he busts the laser out for medical work on my eye. His work creates blank spots in my FOV. Not noticeable at all walking around, but they make detail vision difficult. Everything from artistic project work to seeing the center dot on screen in a shooter, and it makes refractory vision checks to figure out my Rx near impossible. The letters in the eyechart just disappear unless ca…
I don't think this is comparable. One is generally taking long-time exposures for astronomy pictures (hence the streaks).
So if the satellite is simply blocking light, in the worst case, it will block the light of a star, maybe for a few milliseconds(?) dimming the star in the final picture by a minuscule amount.
This might still be problematic (influencing spectroscopy? dimming the star slightly, influencing some measurements there?) but probably still better than potentially mixing in light from a difference source (?)
Re: Study: ultra-black coating could reduce satellite light pollution
#36That’s just Vanta advertisement
Yup, they wrote the paper.
> "...researchers demonstrate how Vantablack® 310 – an ultra-black coating developed by University of Surrey spinout Surrey NanoSystems, co-authors of the paper..."
Re: Study: ultra-black coating could reduce satellite light pollution
#37Earlier quoted context omitted.
How does this happen? Why would something which reflects light on the outside get hotter than one which absorbs light? This makes no intuitive sense to me.
The radiative equilibrium temperature is a function of (watts in - watts out), with a fourth power law shoved in there somewhere. A blackbody at radiative equilibrium absorbs whatever visible light you throw at it, and then spits it back out according to a distribution law that mostly places it in the thermal infrared bands (at temperatures we've familiar with, anyway). Remove convection/conduction as heat transfer m…
Ah right, it reflects in both directions of course. Thanks.
Re: Study: ultra-black coating could reduce satellite light pollution
#38I noticed the word “heat” is not mentioned anywhere in the article. Considering this reflects 2% of the incident light and absorbs 98% of the sunlight, I would expect the cubesat to get very hot very quickly.
It’s been a while since I last engineered something where thermals were a consideration, but this just doesn’t feel right.
Re: Study: ultra-black coating could reduce satellite light pollution
#39>Astha Astha, Postgraduate Research Student >Dr Noelia Noel, Senior Lecturer, PhD in Astrophysics Is this a joke article?
> Noelia Noel
She is from Argentina. Both are common given names and family names here. Neither is in the top 10 list, but they are not unusual to cause surprise. I'd recommend to avoid using both together to avoid nasty online comments.
> Astha Astha
She is from India. Astha is a common given name there. It looks like it's common in some areas to have only a given name and no family name. I guess in some form she was had to fill a family name and decided to repeat the given name instead of using NULL.
Link to the classic article by patio11: "Falsehoods Programmers Believe About Names" (2010) https://www.kalzumeus.com/2010/06/17/falsehoods-programmers-... (a few HN discussions, in particular https://news.ycombinator.com/item?id=21492464 | 150 points | Nov 2019 | 144 comments)