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"Our cameras in Northford, Connecticut, and Douglassville, Pennsylvania, as well as a doorbell camera in Wayne, New Jersey, captured the meteor, and from that w
by fractallyte 2mo ago
"Our cameras in Northford, Connecticut, and Douglassville, Pennsylvania, as well as a doorbell camera in Wayne, New Jersey, captured the meteor, and from that we measured its trajectory... The path traced back to low in the asteroid belt."
I don't doubt it, but that's an astounding trajectory estimation...
- defrost 2mo agoDesert Fireball Network, and less public precursor projects have been doing this for a while now: * https://dfn.gfo.rocks/ https://dfn.gfo.rocks/ * https://en.wikipedia.org/wiki/Desert_Fireball_Network https://en.wikipedia.org/wiki/Desert_Fireball_Network * https://pawsey.org.au/researchers/desert-fireball-network-team/ https://pawsey.org.au/researchers/desert-fireball-network-te...
- imoverclocked 2mo agoFrom the wikipedia link: > The dark flight trajectory of a meteoroid is significantly affected by the atmospheric winds, especially by the jet stream. As a result, the meteorite fall position can be shifted by up to several kilometers compared to a scenario with no winds. That network is mostly interested in where it falls, not where it came from. A few degrees for finding an origin is a huge variation.
- defrost 2mo agoPlanetary scientists are motivated to physically examine freshly fallen near pristine samples, yes. They are also keenly interested in origins, intra or extra solar system, relationships to known showers et al. The less public precursors were and still have an interest in both projected targets and sources.
- anovikov 2mo agoThis is absolutely trivial as long as any fixed ground objects are visible in a camera and does not at all require some sub-pixel precision.
- onion2k 2mo agoIt's trivial to draw a line between some fixed points and extrapolate back to an origin if there's no external forces acting on the asteroid. But there is - planetary gravity, the moon, potentially the sun heating one side of it, atmospheric wind, weather, etc make a big difference. That makes it harder.
- anovikov 2mo agoThat's basics of meteor observation. As long as camera didn't move, you can plot the track against the stars and time is known. Then with two tracks from different locations, orbit is determined.
- lazide 2mo agoAlso, a typical consumer camera is going to struggle (even with the best analysis!) to have visual accuracy within even a few degrees of true (due to everything from high compression ratios in post processing to shitty optical properties in the actual camera) and that makes a probability cone that is pretty large. Still better than nothing, though!
- anovikov 2mo agobuilding a WCS model (pixel XY <-> ray vectors) of a camera is a solved science. Of course you can never expect it to be rectangular.