Some say 0.21 is near and so I had to visit Jool before I've never accomplished it in my old save file. Additionally I was trying to get away from MechJeb since my skills became quite dependent on it, so: Manual controlled probe with backstory.
And yes, I do realize Jool is Jupiter and Cassini orbits Saturn, no need for pointing it out.:lol:
After the recent failure of the space agency to construct a Laythe spaceplane the kerbal government was inclined to make huge budget cuts, to stop putting money into failed missions as they said it. Kerbals on the K-Net immediatley started a support campaign by creating t-shirts with great accomplishments of the space program like putting Jeb on Duna!
But the government was unimpressed by some hippies so Kerbal engineers had to come up with a huge prestige mission real quick, to keep their job and the awesome space program. Since the Laythe spaceplane launches failed just a few days ago there was a good launch window from Kerbin to Jool so a new engineer, fresh from Kerbal City University, asked: "Why don't we build a small probe orbiting Jool and doing flybys of its moons?"
After a bit on the drawing boards they quickly began building the craft - named Kersinni - as a small ion powered probe. Quickly the engineers realized it would be impossible to use RTGs, due to the risk of contamination and problems in the R&D department due to earlier budget cuts after some Dres failures. Also the light weight of the probe and budget restrictions prevented the use of the latest autopilot technology, the mission seemed on the edge of failure.
But our Kerbal engineers were the smartest of the planet and fearing their future they were hard-working, too. After a couple of days the design was finished and already built!
The result? A 700 kilogram, solar powered, ion engine probe.
The launch vehicle was quickly assembled and so Kersinni was ready to launch. Due to the rushed manner of this mission during night, sadly.
After a successful launch and escape burn Kersinni was doing some correction maneuvers on the edge of Kerbin's SOI.
Kerbin government agreed to keep the funding up for one fiscal year, enough time to accomplish the mission, but made future funding dependent on mission success.
But Jool came in sight more than 100 days before budget decisions.
Also in sight came Jool's moons with some observation of Laythe on the way to the first perijool...
Which was decided to be an aerobrake maneuver so Kersinni would save as much fuel as possible enabling a longer lifespan.
The first picture taken after a successful aerobrake maneuver? Joolian sunrise with Vall!
Also pictured: The three most important observation targets: Jool, Laythe and Vall.
Final orbit was then achieved, an equatorial orbit with perijools and apojools enabling Kersinni to fly past every Joovian moon.
After successful orbit tweaking Kerbal engineers realized how much fuel they had left since the cruise stage was still half full, promising a lot of delta-v for many flybys over the mission and thus a long lifespan. Kerbal engineers realized how great it was to use solar panels since they wouldn't limit the lifespan like RTGs.
Everything was set for a successful mission and all discussions about funding stopped, why again did we launch this mission? Because the government loves science!
11,000 m/s of delta-v (ion engines are awesome):
Also notable: The plan was to leave no space debris behind, especially not near Laythe and Vall, which worked for the first stage (burned up in the Kerbin atmosphere). The side tanks of the cruise stage were set to reenter Jool while Kersinni did its aerobrake, which worked for one tank but not for the other which ended up in a kerbolcentric orbit.
Scientists now discuss the probability of this tank impacting a Joolian moon while engineers discuss how to clear this danger economically.
Who needs 0.21 anyway?