2025PASP..137i4401P

The next generation of ground- and space-based observatories will enable direct imaging and characterization of cold, mature planets through thermal emission and, for the first time, reflected light detection. Known RV and astrometrically detected planets provide a known population for detection and characterization observations. However, many of the most promising targets lack orbital parameters of sufficient precision to confidently predict their location on relative to the star for a direct imaging campaign. We have developed projecc, an open source Python package designed to generate sky-plane planet location posteriors from literature orbit solutions. This tool aims to facilitate community preparation for direct imaging observations of known planets. In this work we describe projecc and use it to examine two case study systems relevant to reflected light imaging with ELTs: GJ 876 b, which we find has a well-constrained prediction, and Proxima Centauri b, whose location remains highly uncertain. We provide a web app for exploring reflected light planet targets and their orbit solutions, including predictions from literature for 17 additional planets, located at https://reflected-light-planets.streamlit.app/. We also discuss future upgrades to projecc.