BepiColombo mission flies by Mercury for the first time

The mission will actually place two probes in orbit around Mercury: the ESA-led Mercury Planetary Orbiter and the JAXA-led Mercury Magnetospheric Orbiter, Mio. The orbiters will remain stacked in their current configuration with the Mercury Transfer Module until deployment in 2025.

Once the Bepicolombo spacecraft approaches Mercury to begin orbit, the Mercury Transfer Module part of the spacecraft will separate and the two orbiters will begin circling the planet.

Both probes will spend a year collecting data to help scientists better understand the small, mysterious planet, such as determining more about the processes that unfold on its surface and its magnetic field. This information could reveal the origin and evolution of the closest planet to the sun.

During Friday’s flyby, the spacecraft’s main camera was being shielded and unable to capture high-resolution images. But two of the spacecraft’s three monitoring cameras will take photos of the planet’s northern and southern hemispheres just after the close approach from about 621 miles (1,000 kilometers).

BepiColombo will fly by the planet’s night side, so images during the closest approach wouldn’t be able to show much detail.

The mission team anticipates the images will show large impact craters that are scattered across Mercury’s surface, much like our moon. The researchers can use the images to map Mercury’s surface and learn more about the planet’s composition.

Some of the instruments on both orbiters will be turned on during the flyby so they can get a first whiff of Mercury’s magnetic field, plasma and particles.

The flyby has a timely occurrence on the 101st anniversary of Giuseppe “Bepi” Colombo’s birthday, the Italian scientist and engineer who is the namesake of the mission. Colombo’s work helped explain Mercury’s rotation as it orbits the sun and enabled NASA’s Mariner 10 spacecraft to perform three Mercury flybys rather than just one by using a gravity assist from Venus. He determined that the point where spacecraft fly by planets could actually help make future passes possible.

Mariner 10 was the first spacecraft sent to study Mercury, and it successfully completed its three flybys in 1974 and 1975. Next, NASA sent its Messenger spacecraft to perform three flybys of Mercury in 2008 and 2009, and it orbited the planet from 2011 to 2015.

Now, BepiColombo will take up the task of providing scientists with…