No spacecraft built by humans has flown closer to the Sun than NASA’s Parker Solar Probe. On December 24, 2024, it made its closest approach, passing about 3.8 million miles above the solar surface at about 430,000 miles per hour. This article summarizes what NASA reported and why the distance matters.
What happened on December 24, 2024?
At 6:53 a.m. Eastern time on December 24, 2024, Parker Solar Probe reached its closest approach to the Sun, breaking the mission’s previous record. NASA reports a distance of about 3.8 million miles above the Sun’s surface and a speed of about 430,000 miles per hour. NASA describes that as faster than any human-made object has ever moved. A beacon tone received late on December 26 confirmed that the spacecraft survived and was operating normally.
Why get so close?
The mission’s purpose is to take measurements that NASA calls unrivaled and that could change scientists’ understanding of the Sun. The probe passed through the Sun’s atmosphere, the corona, at record speed and distance. Flying through the corona lets instruments sample the material there directly, instead of looking at it from far away. Future passes at this distance are planned, according to NASA. Our article on solar maximum explains the activity cycle that the probe observes from close range.
How did it get there?
The final phase of the approach ran from the last Venus flyby on November 6, 2024 to the perihelion on December 24, 2024. A Venus flyby is a gravity assist, in which a spacecraft uses a planet’s gravity to change its path and bring its orbit closer to the Sun. The definition is general, while the dates come from NASA. Each close pass is called a perihelion, and the mission has made many of them.
What did the probe see?
The WISPR instrument took the images behind a NASA video that shows solar wind moving outward from the corona. NASA’s page does not name the other instruments or give detailed corona and solar wind results from the closest pass, so we do not describe them. Solar wind is the stream of charged particles flowing out from the Sun. Studying it near its source helps scientists understand space weather that can affect Earth.
Who runs the mission?
The Johns Hopkins Applied Physics Laboratory (APL) leads the team. NASA names Helene Winters as project manager, Nour Raouafi as project scientist and Nick Pinkine as mission operations manager, all at Johns Hopkins APL.
What is the corona?
The corona is the Sun’s outer atmosphere. It can be seen from Earth during a total solar eclipse, a topic covered in our report on the total solar eclipse of August 12, 2026 and in our eclipse explainer. Parker Solar Probe goes into this region instead of watching it from a distance. The comparison is a general one and does not appear on the NASA page.
Timeline of the final approach
- November 6, 2024: the last Venus flyby before the record pass
- December 24, 2024: closest approach to the Sun, about 3.8 million miles above the surface
- December 26, 2024: a beacon tone confirms that the spacecraft is operating normally
Why is the corona a puzzle?
A long-standing question in solar physics is why the corona is far hotter than the Sun’s visible surface. This is general background and is not on the NASA page we used. Parker Solar Probe was designed to fly through the corona, so it can take measurements that bear on questions like this one, though NASA’s page describes the goals only in general terms.
What does the spacecraft need to survive?
NASA’s page does not describe the heat shield or temperatures, so we do not either. The fact that the spacecraft was confirmed to be operating normally after the pass is the key outcome reported. Surviving the closest pass was an engineering test as well as a science milestone, which is our own reading of why NASA highlighted the beacon tone.
Glossary: terms used here
- Perihelion: the point in an orbit closest to the Sun
- Corona: the Sun’s outer atmosphere
- Solar wind: the stream of charged particles flowing out from the Sun
- Gravity assist: a maneuver that uses a planet’s gravity to change a spacecraft’s speed or direction
- Heliophysics: the study of the Sun and its influence on the solar system
These definitions are general ones and are not quoted from the NASA page.
What is not covered on the NASA page?
The page does not give the launch date, the temperature at closest approach or detailed science results. We have left those out and avoided filling them from memory. Readers who want the full mission story should consult NASA’s mission pages directly.
How to read the speed record
A record speed and a record distance go together, because a spacecraft moves fastest where the Sun’s gravity is strongest. That is a general principle of orbital motion. By our own arithmetic, a speed of 430,000 miles per hour is about 120 miles per second. NASA’s comparison, that it is faster than any human-made object has moved, is the headline claim.
Key facts at a glance
- Closest approach: December 24, 2024, at 6:53 a.m. Eastern time
- Distance from the Sun’s surface: about 3.8 million miles
- Speed: about 430,000 miles per hour
- Status check: beacon tone received December 26, 2024
- Imaging instrument named: WISPR
Frequently asked questions
How close did Parker Solar Probe get to the Sun?
About 3.8 million miles above the surface on December 24, 2024.
How fast did it go?
About 430,000 miles per hour, the fastest any human-made object has moved, according to NASA.
Did the spacecraft survive?
Yes. A beacon tone received late on December 26 confirmed it was operating normally.
Will it go that close again?
NASA says future passes at this distance are planned.