# Real-Time Retargeting Using Controllability Boundary for Chandrayaan-3 Lunar Landing

arXiv: https://arxiv.org/abs/2605.29412 · HTML: https://mlsanity.com/paper/2605.29412/

## Key facts

- No citing papers in the map yet (data through 14 Oct 2026).
- Builds on 1 of its 20 references that are in the map.
- First posted on arXiv 28 May 2026.

## Builds on (most cited first, 1 of 1)

- [Powered Descent Trajectory Optimization of Chandrayaan-3 using Radau Collocation and Controllable Sets](https://mlsanity.com/paper/2511.03594/) (2025)

## Abstract (arXiv)

This paper presents the real-time retargeting guidance policy developed for the Chandrayaan-3 lunar landing mission. The baseline guidance generates approximate fuel-optimal descent trajectories, while a high-level policy enables safe retargeting to alternate sites when the nominal site becomes infeasible. The retargeting strategy leverages a convex representation of the controllability boundary, allowing rapid feasibility checks and real-time target updates. To the best of the authors knowledge, this represents the first application of a data-driven retargeting framework in an operational lunar landing mission. Pre-flight simulations and Chandrayaan-3 flight results validate the effectiveness of the proposed approach.