Parker Solar Probe
Humanity’s First Visit to a Star
Launched: August 12, 2018 at 3:31am EDT
Launch Site: NASA’s Kennedy Space Center, Florida
Launch Vehicle: Delta IV-Heavy with Upper Stage
We’ve been studying the Sun for decades, and now we’re finally going to go where the action is!
Parker Solar Probe’s primary science goal is to trace how energy flows through the corona, the outermost layer of the sun’s atmosphere.
The First Mission to the Nearest Star
Parker Solar Probe will be a historic mission, flying into the Sun’s atmosphere (or corona) for the first time.
The corona is the sun’s outer atmosphere and a constant source of curiosity for scientists who study our star. The corona is hundreds of times hotter than the sun’s surface. This is contrary to our normal experience – that it’s cooler further away from a source of heat – so it poses a mystery for solar scientists. The corona is also where magnetic, energetic solar material is accelerated out into space in a non-stop flow called the solar wind.
Launching in 2018, Parker Solar Probe will fly through the corona, closer to the sun’s surface than any other spacecraft to date. Scientists hope this data will help them understand how heat and energy move through the corona and drive the solar wind, which can cause space weather here on Earth. Parker Solar Probe will make two dozen close approaches to the sun over its seven-year mission.
NASA named this mission in honor of Eugene Parker, a solar astrophysicist who revolutionized our understanding of how the sun’s emissions affect our solar system.
Coming closer to the Sun than any previous spacecraft, Parker Solar Probe will employ a combination of in situ measurements and imaging to achieve the mission’s primary scientific goal: to understand how the Sun’s corona is heated and how the solar wind is accelerated. Parker Solar Probe will revolutionize our knowledge of the origin and evolution of the solar wind.
- On the final three orbits, Parker Solar Probe will fly to within 8.5 solar radii of the Sun’s “surface” 8.5 solar radii is 8.5 times the radius of the Sun, or about 3.7 million miles. That is about seven times closer than the current record-holder for a close solar pass, the Helios spacecraft.
- At closest approach, Parker Solar Probe will be hurtling around the Sun at approximately 450,000 miles per hour! That’s fast enough to get from Philadelphia to Washington, D.C., in one second.
- Parker Solar Probe will pass Venus less than two months after launch and will be collecting science data at its first solar pass just one month later.
- At closest approach to the Sun, while the front of Parker Solar Probe’s solar shield faces temperatures approaching 2,500° Fahrenheit (or about 1,400° Celsius), the spacecraft’s payload will be near room temperature.
- Parker Solar Probe will orbit the Sun 24 times, gradually “walking in” toward the Sun with each pass. The closest points of each orbit come well within orbit of Mercury the closest planet to the Sun.
Learn more about Parker Solar Probe & what it is studying:
Parker Solar Probe sits in a clean room on July 6, 2018, at Astrotech Space Operations in Titusville, Florida, after the installation of its heat shield. Credit: NASA/Johns Hopkins APL/Ed Whitman
SPACECRAFT – Extreme Engineering
NASA’s historic Parker Solar Probe (PSP) mission will revolutionize our understanding of the Sun. PSP will swoop closer to the Sun’s surface than any spacecraft before it, facing brutal heat and radiation conditions.
The spacecraft will come as close as 3.83 million miles (and 6.16 million kilometers) to the Sun, well within the orbit of Mercury and more than seven times closer than any spacecraft has come before.
To perform these unprecedented investigations, the spacecraft and instruments will be protected from the Sun’s heat by a 4.5-inch-thick (11.43 cm) carbon-composite shield, which will need to withstand temperatures outside the spacecraft that reach nearly 2,500 degrees Fahrenheit (1,377 degrees Celsius).
In order to unlock the mysteries of the corona, but also to protect a society that is increasingly dependent on technology from the threats of space weather, we will send Parker Solar Probe to touch the sun.
The primary science goals for the mission are to trace the flow of energy and understand the heating of the solar corona and to explore what accelerates the solar wind. Parker Solar Probe provides a statistical survey of the outer corona.
There are four major investigations:
Fields Experiment (FIELDS)
This investigation will make direct measurements of electric and magnetic fields and waves, Poynting flux, absolute plasma density and electron temperature, spacecraft floating potential and density fluctuations, and radio emissions.
FIELDS PI: Prof. Stuart Bale; University of California, Berkeley
Integrated Science Investigation of the sun (IS☉IS)
This investigation makes observations of energetic electrons, protons and heavy ions that are accelerated to high energies (10s of keV to 100 MeV) in the sun’s atmosphere and inner heliosphere, and correlates them with solar wind and coronal structures.
IS☉IS PI: Dr. David McComas; Princeton University
Wide-field Imager for Solar Probe (WISPR)
These telescopes will take images of the solar corona and inner heliosphere. The experiment will also provide images of the solar wind, shocks and other structures as they approach and pass the spacecraft. This investigation complements the other instruments on the spacecraft providing direct measurements by imaging the plasma the other instruments sample.
WISPR PI: Dr. Russell Howard; Naval Research Laboratory, VIDEO CREDIT: NASA/JPL/WISPR Team
Solar Wind Electrons Alphas and Protons (SWEAP) Investigation
This investigation will count the most abundant particles in the solar wind — electrons, protons and helium ions — and measure their properties such as velocity, density, and temperature.
SWEAP PI: Prof. Justin Kasper; University of Michigan/ Smithsonian Astrophysics Observatory
Parker Solar Probe will have 24 orbits around the Sun during its nominal mission.
The last 3, #22, #23, and #24 all being the closest approach to the Sun. The timeline below lists the perihelion of each orbit, which is the point in the orbit when Parker is closest to the Sun.
VIDEO CREDIT: NASA/JHUAPL
Parker Solar Probe Timeline
- March: Critical Design Review (CDR)
- May: System Integration Review
- July: KDP-D
- July: Start of Integration and Testing
- Begin March 2017: Instrument Deliveries
- Begin August 2017: Observatory System Testing
- Fall 2017: Shipment of Observatory to GSFC
- Spring 2018: Shipment of Observatory to Cape Canaveral
- August 6-19, 2018: Launch (current window estimate: approximately 4:15 a.m. to 6:15 a.m. Eastern Daylight Time)
- September 28, 2018: Venus Flyby #1
- November 1, 2018: Perihelion #1
- March 31, 2019: Perihelion #2
- August 28, 2019: Perihelion #3
- December 22, 2019: Venus Flyby #2
- January 24, 2020: Perihelion #4
- June 2, 2020: Perihelion #5
- July 6, 2020: Venus Flyby #3
- September 22, 2020: Perihelion #6
- January 13, 2021: Perihelion #7
- February 16, 2021: Venus Flyby #4
- April 24, 2021: Perihelion #8
- August 5, 2021: Perihelion #9
- October 11, 2021: Venus Flyby #5
- November 16, 2021: Perihelion #10
- February 21, 2022: Perihelion #11
- May 28, 2022: Perihelion #12
- September 1, 2022: Perihelion #13
- December 6, 2022: Perihelion #14
- March 13, 2023: Perihelion #15
- June 17, 2023: Perihelion #16
- August 16, 2023: Venus Flyby #6
- September 23, 2023: Perihelion #17
- December 24, 2023: Perihelion #18
- March 25, 2024: Perihelion #19
- June 25, 2024: Perihelion #20
- September 25, 2024: Perihelion #21
- November 2, 2024: Venus Flyby #7
- December 19, 2024: Perihelion #22 First Close Approach
- March 18, 2025: Perihelion #23
- June 14, 2025: Perihelion #24
CREDIT: JHU/APL & NASA
This summer, NASA is launching Parker Solar Probe, a mission to touch the Sun.
This spacecraft will fly closer to the Sun’s surface than any spacecraft before it, facing brutal heat and radiation. It will be the first spacecraft to fly directly through the Sun’s corona – the part of the solar atmosphere visible during an eclipse – to answer questions about solar physics that have puzzled scientists for more than six decades.
Gathering information about fundamental processes near the Sun can help improve our understanding of how the Sun changes our space environment – such space weather can affect astronauts, interfere with the orbits of satellites, or damage onboard electronics.
Parker Solar Probe’s launch is targeted for August 6–19, 2018. nasa.gov/solarprobe
Join us live to get a deep dive on the science and engineering of this stellar mission. We’ll also be answering your #askNASA questions!
Participating live are:
CREDIT: NASA’s Scientific Visualization Studio and Johns Hopkins University Applied Physics Laboratory.
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