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Here's a nice orbit simulation for Chandrayaan-2 mission: https://sankara.net/chandrayaan2.html https://sankara.net/chandrayaan2.html
by swatkat 7y ago
Here's a nice orbit simulation for Chandrayaan-2 mission: https://sankara.net/chandrayaan2.html https://sankara.net/chandrayaan2.html
- envolt 7y agoThis is mind-blowing.
- bdamm 7y agoIt'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 agon-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 agoYup, that's the term used in engineering as well.
- Aperocky 7y agoThey should use KSP:RSS to simulate their orbit lol. There won't be any glitch then.
- kvsankar_ 7y agoAuthor 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.
- pvelagal 7y agoThat animation is cool !
- Figs 7y agoWhy did they raise the orbit above the Earth so many times instead of just burning for the moon all at once?
- thunderbong 7y agoThe multiple loops are not for gravity assist (or gravitational slingshot [0]) as I had initially thought. It is for the Oberth Effect [1], which I only got to know of today. From the Wikipedia article - >> Oberth maneuver, is a maneuver in which a spacecraft falls into a gravitational well, and then accelerates when its fall reaches maximum speed. The resulting maneuver is a more efficient way to gain kinetic energy than applying the same impulse outside of a gravitational well. >> In some cases, it is even worth spending fuel on slowing the spacecraft into a gravity well to take advantage of the efficiencies of the Oberth effect. Fascinating! To say the least! [0]: https://en.wikipedia.org/wiki/Gravity_assist https://en.wikipedia.org/wiki/Gravity_assist [1]: https://en.wikipedia.org/wiki/Oberth_effect https://en.wikipedia.org/wiki/Oberth_effect
- DataGata 7y agoThe great thing is that it works in Kerbal Space Program, so you can plan out missions that use it in the game.
- kvsankar_ 7y agoAuthor of the tool here - thank you for referring to the simulation here. Glad you liked it.