Phootprint


Phootprint is a proposed sample-return mission to the Mars moon Phobos by the European Space Agency, proposed to be launched in 2024.

Overview and status

The Phootprint mission is a candidate for the Mars Robotic Exploration Preparation Programme 2 at ESA. During 2014, ESA funded a pre-phase A feasibility study and industrial system studies of 8-month duration. Currently, it is in phase A, meaning 'mission definition study.'
The mission is proposed to be launched on an Ariane 5 in 2024 with early 2026 as backup date. An Earth swingby would provide greater launcher margin. The spacecraft would orbit Mars for the characterisation phase, and when ready, it would maneuver into a quasi-satellite orbit to facilitate landing. Because of the low gravity, the lander would be anchored to the surface during sample collection and launch of the Earth Re-entry Capsule.
The mission would last about 3.5 years, including cruise, mapping orbit, 7 days on the surface, and sample return cruise time. The spacecraft would be powered by solar arrays.
In August 2015, the ESA-Roscosmos working group on post-ExoMars cooperation, completed a joint study for a possible future Phobos Sample Return mission, and preliminary discussions were held.

Objectives

The top-level science goal is to understand the formation of the Martian moons Phobos and Deimos and put constraints on the evolution of the Solar System.
The mission objectives are:
Mission engineers remark that "no rebound" after landing is a critical condition given the low-gravity environment of landing. Currently, engineers at ESA are leaning toward four cantilever-type landing legs with crushable aluminium honeycomb shock absorber and secondary load limiters.

Spacecraft

The concept of the Phootprint spacecraft is still preliminary and composed by three modules:
, the conceptual 30 kg payload is:
The proposed mission architecture is:
  1. Ariane 5 launch from Kourou in direct escape
  2. Transfer to Mars
  3. Nine months orbiting Phobos/Mars dedicated to science observations and sampling
  4. Departure from Mars to Earth