Texas astrophotographer Ethan Chappel captured the incredible sight while he was filming the planet, and said the event on Jupiter's southern equatorial belt "looks awfully like an impact flash." A bright spot can be seen appearing out of nowhere before it quickly fades away.
"After I checked the video and saw the flash, my mind started racing! I urgently felt the need to share it with people who would find the results useful," Chappel told ScienceAlert.
Astronomer Jonti Horner said he had "never seen anything like that before," and described the flash as "just totally breathtaking."
"A lot of the time these things will go unnoticed and unobserved," he explained. "Half of them will happen on the far side of the planet. So there's a lot of things working against seeing these events."
The explosion appears to be a bolide, a meteor that explodes mid-air as it enters the atmosphere. They are fairly common on Earth, which is a smaller and less gravitationally intense a planet than Jupiter is. Jupiter is also surrounded by objects like comets and asteroids that can get sucked into its gravity.
A 1998 study found the rate of large impacts on Jupiter are between 2,000 and 8,000 times the rate of impacts on Earth. Capturing the impacts are rare, however. One was captured in 2009 and again in 2010.
The impact may have left a scar that could be picked up by the Jupiter probe Juno or other instruments.
Comment: It's not "extremely rare." It's not even "rare."
It USED to be, before 1994, when Comet Shoemaker-Levy broke up and impacted Jupiter.
Since then, comets/asteroids have been observed hitting Jupiter on a number of occasions...
- 26 May 2017: New impact flash seen on Jupiter
- 10 Sept 2012: Jupiter Swallows an Asteroid - or a Comet?
- 3 June 2010 + 20 August 2010: Fireballs Light Up Jupiter
- 19 July 2009: Jupiter Scar Likely from Rocky Body
Notably, this most recent one occurred almost 25 years to the day that Shoemaker-Levy hit Jupiter in mid-1994.