NASA announced its new milestone today, saying that according to its team's calculations, the Parker Solar Probe exceeded Helios 2's 26.55 million miles record on Monday afternoon.
Parker's first close encounter with the Sun is scheduled for October 31.
The impressive mission in getting so close to the sun is on its way, and the Parker Solar Probe has already broken some of the records.
For the record, the Sun is about 149.6 million kilometres from Earth.
The previous record was held by the Helios 2 craft, which was launched from Florida's Cape Canaveral Air Force station in 1976. It will surpass Helios-2's speed record of 153,454 miles per hour (247,000 kilometers per hour), relative to the sun.
Parker Solar Probe - jointly operated by NASA and the Johns Hopkins University Applied Physics Laboratory - went past the record at 2:54 a.m. GMT on Tuesday 30 October (10:54 p.m. Monday 29 October EDT).
Parker blasted off on its odyssey atop a United Launch Alliance Atlas V rocket in the early hours of August 12, 2018.
On October 31, the day of Halloween, NASA will begin its first so-called solar encounter with the burning star.
During its 7-year mission, the probe will complete 24 orbits of the Sun, coming within 3.8 million miles of its surface, and dip into the corona, the plasmic aura that is even hotter than the surface.
The Sun-bound mission is expected to last around seven years, during which the probe will orbit the planet Venus to get closer to the Sun.
At the same time, the probe has to withstand vast temperatures of up to 1,377 Celsius (2,500 Fahrenheit).
The spacecraft sports a special carbon-composite shield to protect itself and its instruments from intense heat and radiation during its close flybys.
In September, NASA released the first picture taken of the Parker Solar Probe.