Juno slingshots past Earth on its way to Jupiter
If you've ever whirled a ball attached to a string around your head and then let it go, you know the great speed that can be achieved through a slingshot maneuver. Similarly, NASA's Juno spacecraft will be passing within some 350 miles of Earth's surface at 3:21p.m. EDT Wednesday, Oct. 9, before it slingshots off into space on a historic exploration of Jupiter.
It's all part of a scientific investigation that began with an August 2011 launch. The mission will begin in earnest when Juno arrives at Jupiter in July 2016. Bill Kurth, University of Iowa research scientist and lead investigator for one of Juno's nine scientific instruments, the Waves instrument, says that the two years spent moving outward past the orbit of Mars before swinging past Earth makes the trip to Jupiter possible.
"Juno will be really smoking as it passes Earth at a speed of about 25 miles per second relative to the sun. But it will need every bit of this speed to get to Jupiter for its July 4, 2016 capture into polar orbit about Jupiter," says Kurth, who has been involved with the mission since the beginning. "The first half of its journey has been simply to set up this gravity assist with Earth."
"One of Juno's activities during the Earth flyby will be to make a movie of the Earth-moon system that will be the first to show Earth spinning on its axis from a distance," says Scott Bolton, principal investigator for the Juno mission from Southwest Research Institute in San Antonio.
Kurth and colleagues UI Professor Don Gurnett and research scientist George Hospodarsky note that the real science will begin when Juno begins orbiting Jupiter some 33 times over the course of a year. Juno will be the first spacecraft to orbit Jupiter over its poles. The orbit will be highly eccentric, taking Juno from just above the cloud tops to a distance of about 1.75 million miles from Jupiter, every 11 days.
The UI-designed-and-built Waves instrument will examine a variety of phenomena within Jupiter's polar magnetosphere by measuring radio and plasma waves. It's one of nine experiments to be undertaken of the gas giant.
In particular, Juno will explore the solar system's most powerful auroras -- Jupiter's northern and southern lights -- by flying directly through the electrical current systems that generate them.
"Jupiter has the largest and most energetic magnetosphere, and to finally get an opportunity to study the nature of its auroras and the role radio and plasma waves play in their generation makes Juno a really exciting mission for me," says Kurth.
Juno's other major objectives are to understand the origin and evolution of the solar system's largest planet by: Determining the amount of water and ammonia present in the atmosphere. Observing the dynamics of Jupiter's upper atmosphere. Mapping the planet's magnetic and gravity fields to learn more about its deep interior including the size of its core.
Gurnett, a world leader in the field of space plasma physics, says the Juno spacecraft and its unique orbit will expand upon Jupiter data gathered by previous UI instruments.
Juno's destiny is a fiery entry into Jupiter's atmosphere at the end of its one-year science phase as a means of guaranteeing it doesn't impact Europa and possibly contaminate that icy world with microbes from Earth. This would jeopardize future missions to that moon designed to determine whether life had begun there on its own.
The Juno Waves instrument will be the eighth UI instrument to make the trek to Jupiter. Previous Iowa instruments were carried aboard Pioneers 10 and 11, Voyagers 1 and 2, Galileo (including two UI instruments), and Cassini, currently in orbit around Saturn.
The Waves instrument was built at the UI by a group of about a dozen scientists, engineers, and technicians, led by research engineer Donald Kirchner. Terry Averkamp, Chris Piker, and William Robinson assist in the operation of the Waves instrument and in the data processing.
The Juno project is a collaborative enterprise, led by Scott Bolton of the Southwest Research Institute of San Antonio, including the UI and many other organizations and individuals.
Source: University of Iowa
- NASA Jupiter Probe Recovers from Earth Flyby Glitchfrom Space.comMon, 14 Oct 2013, 11:00:24 EDT
- Juno spacecraft resumes full flight operations on its way to Jupiterfrom PhysorgSat, 12 Oct 2013, 6:30:35 EDT
- Jupiter-bound Juno spacecraft returns to normal after glitchfrom MSNBC: ScienceFri, 11 Oct 2013, 22:20:41 EDT
- NASA Jupiter Probe Still In 'Safe Mode' After Earth Flyby Glitchfrom Space.comFri, 11 Oct 2013, 8:50:38 EDT
- On its way to Jupiter, NASA's Juno probe sends snapshot of Earthfrom MSNBC: ScienceFri, 11 Oct 2013, 2:20:37 EDT
- NASA's Juno spacecraft enters "safe mode," but mission managers optimisticfrom CBSNews - ScienceThu, 10 Oct 2013, 18:50:28 EDT
- NASA troubleshooting Jupiter-bound spacecraftfrom PhysorgThu, 10 Oct 2013, 17:00:48 EDT
- Juno spacecraft makes Earth flybyfrom CBC: Technology & ScienceThu, 10 Oct 2013, 12:00:20 EDT
- NASA Jupiter Probe Suffers Glitch After Earth Flybyfrom Space.comWed, 9 Oct 2013, 21:30:22 EDT
- Jupiter-bound Juno probe encounters glitch after Earth flybyfrom MSNBC: ScienceWed, 9 Oct 2013, 19:30:58 EDT
- NASA spacecraft enters safe mode after Earth flybyfrom PhysorgWed, 9 Oct 2013, 19:00:31 EDT
- NASA spacecraft zips by Earth en route to Jupiterfrom PhysorgWed, 9 Oct 2013, 17:00:42 EDT
- Fly-by of Earth to fling spacecraft toward Jupiterfrom UPIWed, 9 Oct 2013, 17:00:17 EDT
- NASA Spacecraft Slingshots By Earth On Way to Jupiter, Snaps Photosfrom Space.comWed, 9 Oct 2013, 16:31:00 EDT
- Exclusive: Bill Nye Explains Jupiter's Great Red Spot In Classic Bill Nye Stylefrom PopSciWed, 9 Oct 2013, 16:30:45 EDT
- How to watch NASA's Juno zip by Earth on its mission to Jupiterfrom MSNBC: ScienceWed, 9 Oct 2013, 13:00:55 EDT
- Wave hello to Jupiter-bound Juno probe as it flies by Earth to 'refuel' from MSNBC: ScienceWed, 9 Oct 2013, 12:31:35 EDT
- Juno spacecraft makes Earth flyby todayfrom CBC: Technology & ScienceWed, 9 Oct 2013, 12:00:16 EDT
- NASA's Jupiter-Bound Juno Spacecraft Buzzes Earth Today: Watch It Livefrom Space.comWed, 9 Oct 2013, 11:00:30 EDT
- Jupiter-bound NASA probe to grab speed boost from Earth flyby Wednesdayfrom CBSNews - ScienceWed, 9 Oct 2013, 10:30:39 EDT
- Juno Slingshots Past Earth on Its Way to Jupiterfrom Newswise - ScinewsTue, 8 Oct 2013, 23:30:21 EDT
- Jupiter-Bound NASA Probe to Grab Speed Boost from Earth Flyby Wednesdayfrom Space.comTue, 8 Oct 2013, 18:01:45 EDT
- Juno Slingshots Past Earth on Its Way to Jupiterfrom Newswise - ScinewsTue, 8 Oct 2013, 16:00:25 EDT
- Juno slingshots past Earth on its way to Jupiterfrom Science DailyTue, 8 Oct 2013, 15:00:29 EDT
- Juno slingshots past Earth on its way to Jupiterfrom PhysorgTue, 8 Oct 2013, 14:31:00 EDT
- Earth's Gravity to Slingshot Jupiter-Bound Juno Spacecraft | Videofrom Space.comTue, 8 Oct 2013, 14:00:50 EDT
- Jupiter-Bound NASA Spacecraft Will Swing By Earth Wednesdayfrom Space.comMon, 7 Oct 2013, 15:00:48 EDT
Latest Science NewsletterGet the latest and most popular science news articles of the week in your Inbox! It's free!
Check out our next project, Biology.Net
From other science news sites
Popular science news articles
No popular news yet
- Hubble finds phantom objects near dead quasars
- New instrument dates old skeleton; 'Little Foot' 3.67 million years old
- Science and medicine have a 'publication pollution' problem
- Ancient seashell coloration patterns revealed using ultraviolet light
- Tiny songbird discovered to migrate non-stop, 1,500 miles over the Atlantic