A Path To An All-Sky Survey With The Nancy Grace Roman Space Telescope

A deep, space-based, all-sky near-infrared survey carried out with the Nancy Grace Roman Space Telescope would constitute a foundational astronomical infrastructure for decades to come.

In this white paper, we present a concrete and feasible path to imaging the entire sky at ∼0.1″ resolution, beginning with high-impact fields in Cycle 1 and scaling to ultra-wide coverage within the nominal mission.

This first-epoch survey will reach H∼25.5 AB mag (5σ) and maximize synergies with contemporaneous observatories, while preserving substantial time for other ambitious Roman programs.

We outline representative scheduling scenarios and an example Cycle 1 program that triples early Roman-LSST overlap and delivers high-value community data products such as LSST forced photometry, joint Gaia-Roman astrometry, and catalogs of Galactic substructure, stong lenses, and other rare systems.

The Cycle 1 program will lay the foundation for an eventual all-sky survey, while also delivering high-impact early science. We invite broad community participation in shaping and carrying out both the initial program and the long-term vision of an all-sky Roman survey.

Jiwon Jesse Han, Anirudh Chiti, Kai-Feng Chen, Keith Bechtol, Andrea Bellini, Robert Benjamin, Adam Bolton, Ana Bonaca, Alex Broughton, Esra Bulbul, Susan Clark, Charlie Conroy, Suchetha Cooray, John Franklin Crenshaw, Tansu Daylan, Arjun Dey, Alex Drlica-Wagner, Tim Eifler, Kareem El-Badry, Richard M. Feder, Peter Ferguson, Shenming Fu, Sebastian Gomez, Ryan Hickox, Christopher Hirata, Easton J. Honaker, Xiaosheng Huang, Alexander P. Ji, Michael Liu, Kevin A. McKinnon, Geoffrey Mo, Burcin Mutlu-Pakdil, Adrian M. Price-Whelan, Alessandro Savino, David J. Schlegel, Nora Shipp, Jay Strader, Federica Tarsitano, Adrien C.R. Thob, Kim-Vy Tran, Roeland P. van der Marel, Feige Wang, Risa Wechsler, Daniel R. Weisz, Dennis Zaritsky, Tianqing Zhang, Shreya Anand, Amirnezam Amiri, Abhijeet Anand, Matthew L. N. Ashby, Finian Ashmead, Leandro Beraldo e Silva, Aliza Beverage, Michael R. Blanton, Warren R. Brown, Anthony G.A. Brown, Priyanka Chakraborty, Yi-Kuan Chiang, Jose M. Diego, Denis Erkal, Simone Ferraro, Lluís Galbany, Marla Geha, Oleg Y. Gnedin, Lars Hernquist, Jason A. S. Hunt, Valentin D. Ivanov, Venu Kalari, Nitya Kallivayalil, András Kovács, Kyle Kremer, Ting-Wen Lan, Denis Leahy, Jiaxuan Li, Ivan Minchev, GyuChul Myung, Ethan O. Nadler, Joan R. Najita, Melissa K. Ness, Jacob Nibauer, Fabio Pacucci, David Parkinson, Ekta Patel, R. Michael Rich, Marina Ricci, Graziano Rossi, Nikolina Sarcevic, Arnab Sarkar, Andrew K. Saydjari, Arman Shafieloo, Zachary Slepian, Sangmo Tony Sohn, David N. Spergel, Róbert Szabó, Christina C. Williams, John F. Wu

Comments: Comments are welcome and encouraged
Subjects: Instrumentation and Methods for Astrophysics (astro-ph.IM); Cosmology and Nongalactic Astrophysics (astro-ph.CO); Earth and Planetary Astrophysics (astro-ph.EP); Astrophysics of Galaxies (astro-ph.GA); High Energy Astrophysical Phenomena (astro-ph.HE); Solar and Stellar Astrophysics (astro-ph.SR)
Cite as: arXiv:2602.21280 [astro-ph.IM] (or arXiv:2602.21280v1 [astro-ph.IM] for this version)
https://doi.org/10.48550/arXiv.2602.21280
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Submission history
From: Jiwon Han
[v1] Tue, 24 Feb 2026 19:00:00 UTC (285 KB)
https://arxiv.org/abs/2602.21280

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