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Author Topic: Due to concerns about engine, Juno to remain in elongated Jupiter orbit  (Read 559 times)

Offline Flyaway

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The Leros engine has commonalities with other engines that have called issues including MUOS 5 I believe.

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“During a thorough review, we looked at multiple scenarios that would place Juno in a shorter-period orbit, but there was concern that another main engine burn could result in a less-than-desirable orbit,” said Rick Nybakken, Juno project manager at NASA’s Jet Propulsion Laboratory in Pasadena, California. “The bottom line is a burn represented a risk to completion of Juno’s science objectives.”

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Operating Juno beyond its designed lifetime comes with a price tag, too. The requested budget for Juno operations in fiscal year 2017 was $39.1 million, which was projected to fall to $14.5 million in 2018 as the mission came to a close. Now, if NASA must come up with an additional $100 to $150 million for an extended mission, those costs will almost certainly harm other missions in the agency’s science directorate.

https://arstechnica.com/science/2017/02/due-to-concerns-about-engine-juno-to-remain-in-elongated-jupiter-orbit/

Offline Archibald

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Re: Due to concerns about engine, Juno to remain in elongated Jupiter orbit
« Reply #1 on: February 23, 2017, 11:35:16 pm »
How ironic ! Juno (notably its solar panels) was to be fried by Jupiter radiation belts, hence a short lived mission... fate has decided otherwise.
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Offline blackstar

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Re: Due to concerns about engine, Juno to remain in elongated Jupiter orbit
« Reply #2 on: February 24, 2017, 07:52:14 am »
How ironic ! Juno (notably its solar panels) was to be fried by Jupiter radiation belts, hence a short lived mission... fate has decided otherwise.

As I understand it, the maximum dose is encountered at closest approach. It will still have the same number of close approaches, but they will happen further apart because of the bigger orbit. Of course, a longer mission will cost more money.