In recent years, there has been a renewed interest in technology development for space-based optical and infrared interferometry. One such pathfinder is Pyxis, a set of three autonomous robotic platforms designed to operate in the carpark of Mt Stromlo Observatory, Canberra, where it will simulate formation-flying while performing optical interferometry. In this paper, we will provide an update on the interferometer, detailing the initial results of the control subsystems. We will also share our future plans to begin space qualification and adaptation of Pyxis into a set of nano-satellites.
MAVIS passed the Preliminary Design Review in March 2023 and kick started its phase C early June. We are aiming at a Final Design Review in December 2024. I will report on the state of MAVIS design, as well as general project updates, schedule, procurement, risks. We are working on early procurement (Long Lead Item review held on October 2023) as well as on a number of prototype activities I will report on.
In the past few years, there has been a resurgence in studies of space-based optical/infrared interferometry, particularly with the vision to use the technique to discover and characterize temperate Earth-like exoplanets around solar analogs. One of the key technological leaps needed to make such a mission feasible is demonstrating that formation flying precision at the level needed for interferometry is possible. Here, we present Pyxis, a ground-based demonstrator for a future small satellite mission with the aim to demonstrate the precision metrology needed for space-based interferometry. We describe the science potential of such a ground-based instrument and detail the various subsystems: three six-axis robots, a multi-stage metrology system, an integrated optics beam combiner, and the control systems required for the necessary precision and stability. We conclude by looking toward the next stage of Pyxis: a collection of small satellites in Earth orbit.
The Pyxis interferometer is a ground-based pathfinder for an optical space interferometer being built at Mt Stromlo Observatory. In this second paper, we discuss the system breakdown of the interferometer and its mechanical design. We outline the interferometer’s three robotic platforms, with two telescopic collectors and one central beam combiner. Each collector utilises a full aluminium, diamond-turned telescope, designed to remove thermal distortions for future space applications. We also explain the chosen control system for the interferometer and how it will be used to ensure the linear and angular control requirements, including sub-milli-radian angular control of each robot.
Optical interferometry from space is arguably the most exciting prospect for high angular resolution astrophysics; including the analysis of exoplanet atmospheres. This was highlighted in the recent ESA Voyage 2050 plan, which pointed out the exciting potential of this technology, but also indicated the critical need for technological demonstrators. Here we present the Pyxis interferometer; a ground-based pathfinder for a CubeSat space interferometer, currently being built at Mt Stromlo Observatory. We outline its technological and scientific potential as the only visible wavelength interferometer in the Southern Hemisphere, and the optical systems designed to provide CubeSat compatible metrology for formation flying.
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