ESA – Jupiter Icy Moons Explorer: Live Launch

Re:ESA – Jupiter Icy Moons Explorer: Live Launch by eep_social on Thursday April 13, 2023 @03:51AM (#35552330)

Efficiency [1] in the form of reduced delta-v requirements [2]. The “yellow book” assessment study report probably has even more details [3].

[1] https://theconversation.com/the-much-anticipated-juice-missi...

[2] https://www.lpi.usra.edu/opag/mar2012/presentations/Friday/5...

[3] https://sci.esa.int/web/juice/-/49837-juice-assessment-study...

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Re:ESA – Jupiter Icy Moons Explorer: Live Launch by perihelions on Thursday April 13, 2023 @04:35AM (#35552616)

Here's a key figure:

- "The mass injected into the Earth escape trajectory would be 4800 kg (without launch adapter), with a hyperbolic escape velocity of 3.15 km/s, which increases to 9.5 km/s after the last Earth swing-by"

The Voyagers were launched directly to >10 km/s — comparable to the speed JUICE will reach on its third flyby of Earth, in 2029.

https://sci-hub.ru/10.1016/j.actaastro.2019.06.013 ("C₃ of... 105.5 km²/s² and 102.4 km²/s² for Voyagers 1 and 2, respectively [75]")

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Re:ESA – Jupiter Icy Moons Explorer: Live Launch by mytailorisrich on Thursday April 13, 2023 @07:54AM (#35554036)

Voyager was also only weighing 773kg.

The mass of JUICE is probably a big parameter here.

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