4 ms·

It's a really nice tool, I had several ah-hah moments! Does anyone know what the teleportation glitch is right at Lunar capture?

by bdamm 7y ago

swatkat 7y ago
>> Does anyone know what the teleportation glitch is right at Lunar capture? Not sure! Author of this tool is here: https://forum.nasaspaceflight.com/index.php?topic=20324.msg1979284#msg1979284 https://forum.nasaspaceflight.com/index.php?topic=20324.msg1... He might visit HN if notices traffic from here :)
colechristensen 7y ago
n-body problems are hard, 2-body problems are easy (can by analytically solved) One pretty accurate way of approximating orbits is the patched conic method where you break your n-body problem into multiple 2-body problems picking the most influential body for specific parts of a journey. Interplanetary journeys will have three parts ex. earth-craft, sun-craft, and mars-craft. The glitch might be some noise switching between two different patches.
- outworlder 7y ago
  > One pretty accurate way of approximating orbits is the patched conic method where you break your n-body problem into multiple 2-body problems picking the most influential body for specific parts of a journey. So, KSP's "Sphere of Influence" ?
  - colechristensen 7y ago
    Yup, that's the term used in engineering as well.
Aperocky 7y ago
They should use KSP:RSS to simulate their orbit lol. There won't be any glitch then.
kvsankar_ 7y ago
Author of the animation here - glad you liked the tool. I use data published by JPL/NASA HORIZONS interface which provides orbit data for all natural bodies and spacecraft. The "glitch" is because of the data I fetched and used - it has nothing to do with the animation per se. As of now, the JPL site provides data only until 20th August - the time when I fetched the data a few days back, the data was available until 16th September. This was a "merge" of 3 orbit segments - the Earth bound orbits, the transfer orbit and lunar bound orbits. The former two fit the observed data. The latter was entirely based on predictions. This merged orbit has a discontinuity where the predictions start and that's why there seems to be a glitch. Once revised data is available from JPL/HORIZONS, I presume the glitch will go away.

It's a really nice tool, I had several ah-hah moments! Does anyone know what the teleportation glitch is right at Lunar capture?

by bdamm 7y ago

It's a really nice tool, I had several ah-hah moments! Does anyone know what the teleportation glitch is right at Lunar capture?

swatkat 7y ago

>> Does anyone know what the teleportation glitch is right at Lunar capture? Not sure! Author of this tool is here: https://forum.nasaspaceflight.com/index.php?topic=20324.msg1979284#msg1979284 https://forum.nasaspaceflight.com/index.php?topic=20324.msg1... He might visit HN if notices traffic from here :)

colechristensen 7y ago

n-body problems are hard, 2-body problems are easy (can by analytically solved) One pretty accurate way of approximating orbits is the patched conic method where you break your n-body problem into multiple 2-body problems picking the most influential body for specific parts of a journey. Interplanetary journeys will have three parts ex. earth-craft, sun-craft, and mars-craft. The glitch might be some noise switching between two different patches.

outworlder 7y ago
> One pretty accurate way of approximating orbits is the patched conic method where you break your n-body problem into multiple 2-body problems picking the most influential body for specific parts of a journey. So, KSP's "Sphere of Influence" ?
- colechristensen 7y ago
  Yup, that's the term used in engineering as well.

Aperocky 7y ago

They should use KSP:RSS to simulate their orbit lol. There won't be any glitch then.

kvsankar_ 7y ago

Author of the animation here - glad you liked the tool. I use data published by JPL/NASA HORIZONS interface which provides orbit data for all natural bodies and spacecraft. The "glitch" is because of the data I fetched and used - it has nothing to do with the animation per se. As of now, the JPL site provides data only until 20th August - the time when I fetched the data a few days back, the data was available until 16th September. This was a "merge" of 3 orbit segments - the Earth bound orbits, the transfer orbit and lunar bound orbits. The former two fit the observed data. The latter was entirely based on predictions. This merged orbit has a discontinuity where the predictions start and that's why there seems to be a glitch. Once revised data is available from JPL/HORIZONS, I presume the glitch will go away.