Por Renan Filho · 2026-09-28**Lead**
NASA confirmed late Monday that its Parker Solar Probe successfully completed its closest-ever approach to the Sun on September 27, 2026, passing within 6.1 million miles (approximately 9.8 million kilometers) of the solar surface. The spacecraft transmitted a beacon tone to mission control at the Johns Hopkins Applied Physics Laboratory in Laurel, Maryland, on the evening of September 28, indicating that all systems remain operational after a flyby that brought the probe through the Sun's outer corona, where temperatures exceed 2,500 degrees Fahrenheit.
**Context**
The Parker Solar Probe, launched in August 2018, is part of NASA's Living With a Star program, designed to study the Sun's outer atmosphere and its effects on space weather. This particular pass marks the 23rd close encounter with the Sun since the mission began, and the third closest approach in the spacecraft's history, matching the distance set during its previous perihelion in March 2026.
During the flyby, the probe reached a top speed of approximately 430,000 miles per hour, making it the fastest human-made object ever built. At its closest point, the spacecraft was positioned within the solar corona, where the plasma temperature reaches millions of degrees, though the probe's heat shield — a 4.5-inch-thick carbon-composite layer — kept the instruments at a comfortable room temperature of about 85 degrees Fahrenheit.
The mission team designed this particular encounter to gather data on the Sun's magnetic field reversals, the acceleration of the solar wind, and the mechanisms that heat the corona to temperatures far exceeding the Sun's visible surface. Scientists are particularly interested in how the Sun's magnetic field evolves during periods of increased activity, as the current solar cycle approaches its expected maximum.
The beacon tone received on Monday is a simple status signal, but it carries immense significance: it tells engineers that the spacecraft's batteries are charged, the solar panels are oriented correctly, and the onboard computer survived the extreme thermal and radiation environment. Full telemetry data, including science measurements, is expected to begin downloading to Earth starting late this week.
The significance of this mission extends beyond the immediate data return. The Parker Solar Probe is the first spacecraft to fly through the solar corona, a region that defines the boundary between the Sun's atmosphere and interplanetary space. Understanding this boundary is critical to predicting solar flares and coronal mass ejections, which can disrupt satellite communications, GPS navigation, and power grids on Earth.
**Analysis**
The successful completion of this flyby reinforces the maturity of the mission's operations after more than eight years in space. The spacecraft has now completed its primary objective — sampling the solar wind at its source — and is operating on an extended mission that will continue until at least 2030, with planned encounters that will gradually adjust the probe's orbit.
The timing of this close approach is particularly notable given the current state of the solar cycle. Solar activity has been ramping up steadily through 2026, with an increasing number of sunspots and coronal mass ejections observed in recent months. The data from this perihelion will provide direct measurements of the solar wind conditions during an active phase, offering scientists an unprecedented opportunity to compare observations across different levels of solar activity.
Scientists at NASA and partner institutions are also analyzing the probe's measurements of dust particles and cosmic rays in the inner heliosphere, data that contributes to a broader understanding of the space environment surrounding our planet. Engineers, meanwhile, are evaluating the heat shield's performance under the most demanding conditions it has faced yet, informing the design of future solar-observing missions.
Perhaps most importantly, the Parker Solar Probe's data continues to refine predictive models of space weather events. Each close pass yields new insights into the mechanisms that drive solar eruptions, and the models that rely on this data directly support the NOAA Space Weather Prediction Center's operational forecasting. As society becomes increasingly reliant on satellites for communications, navigation, and Earth observation, the practical value of this fundamental science grows correspondingly.
The mission team is now preparing for the science data playback, which will occur over the next two weeks as the spacecraft’s high-gain antenna aligns with Earth. The full dataset from this encounter is expected to be released to the scientific community before the end of the calendar year, following the standard calibration and validation process.
**Fontes**
NASA Press Release, September 28, 2026 · Johns Hopkins Applied Physics Laboratory Mission Operations Center · NOAA Space Weather Prediction Center public telemetry reports.