15.02.2025

The flyby is a gravity assist that will save the spacecraft fuel as it prepares to land on the moon.

An artist's impression of ispace's RESILIENCE lander and micro rover on the surface of the moon.  (Image credit: ispace)

The second lunar lander from Japanese space exploration company ispace is ready for a flyby of the moon as part of its elongated moon landing journey.

ispace's Resilience lander launched on Jan. 15 atop a SpaceX Falcon 9 rocket, along with Firefly Aerospace's Blue Ghost lander. It is taking an energy-efficient, circuitous route to the moon, and only last week performed a crucial maneuver to raise its orbit and set up the lunar flyby.

The flyby is a gravity assist that will save the spacecraft fuel, altering the spacecraft's trajectory into a low energy transfer. That means the maneuver will set up a later rendezvous with the moon that will allow Resilience to enter lunar orbit with a much smaller engine burn than required for a more traditional, direct four-day trip to the moon.

"During the flyby the Resilience lander will experience the biggest change in velocity of the mission, and yet, due to the way gravitational forces work, it will not actually feel any acceleration," ispace stated in a Feb. 13 post on social media platform X.

"The moon will pass by so closely that it will alter its [Resilience lander] trajectory into the second orbital phase of the mission, the low energy transfer. And that is the lunar flyby!," another post on Feb. 12 stated.

ispace did not reveal a precise time of the flyby, stating on X on Feb. 12 that it would take place on Feb. 14 (UTC) but later posting on Feb. 13 that the event was two days away. Resilience was 286,000 miles (460,000 kilometers) away from Earth on Feb. 12, out beyond the distance of the moon.

The spacecraft may take the opportunity to test sensors and return images of the moon from its close approach with our celestial neighbor. Resilience recently imaged Point Nemo, the most remote place on our planet, while still relatively close to the Earth.

Resilience is expected to attempt to land in Mare Frigoris ("Sea of Cold") in the northern hemisphere of the moon around late May or early June. The lander carries a range of payloadsincluding the Tenacious micro rover for mobile exploration.

Meanwhile, Resilience's flight partner, the Blue Ghost lander, is all set to reach lunar orbit after a translunar injection burn on Feb. 8.

Quelle: SC