[Paper Review] Overview, design, and flight results from SuperBIT: a high-resolution, wide-field, visible-to-near-UV balloon-borne astronomical telescope

L. Javier Romualdez, Steven J. Benton+18 more|arXiv (Cornell University)|Jul 8, 2018

Adaptive optics and wavefront sensing10 references3 citations

TL;DR

SuperBIT is a super-pressure balloon-borne telescope designed for sub-arcsecond, wide-field, visible-to-near-UV imaging with 0.02" image stability over a 0.5-degree field of view. Flight results from two test missions confirm its capability for long-duration, high-resolution astronomy at stratospheric altitudes, paving the way for a 100-day science mission in 2020.

ABSTRACT

Balloon-borne astronomy is a unique tool that allows for a level of image stability and significantly reduced atmospheric interference without the often prohibitive cost and long development time-scale that are characteristic of space-borne facility-class instruments. The Super-pressure Balloon-borne Imaging Telescope (SuperBIT) is a wide-field imager designed to provide 0.02" image stability over a 0.5 degree field-of-view for deep exposures within the visible-to-near-UV (300-900 um). As such, SuperBIT is a suitable platform for a wide range of balloon-borne observations, including solar and extrasolar planetary spectroscopy as well as resolved stellar populations and distant galaxies. We report on the overall payload design and instrumentation methodologies for SuperBIT as well as telescope and image stability results from two test flights. Prospects for the SuperBIT project are outlined with an emphasis on the development of a fully operational, three-month science flight from New Zealand in 2020.

Motivation & Objective

• Address the growing scientific demand for high-resolution, wide-field, visible-to-near-UV imaging in astrophysics and cosmology.
• Overcome limitations of ground-based telescopes due to atmospheric absorption and turbulence, particularly in the UV and near-UV.
• Provide a cost-effective, flexible alternative to space-based observatories like Hubble, with rapid instrument upgrades and technology validation.
• Enable long-duration, stable observations for deep imaging and spectroscopy of exoplanets, galaxies, and dark matter phenomena.
• Support future flagship missions like Euclid, WFIRST, and LSST by extending baseline observations and enhancing UV photometric redshift accuracy.

Proposed method

• Utilize a super-pressure balloon (SPB) platform to achieve long-duration, stable flight at altitudes above 99% of Earth's atmosphere.
• Implement a three-axis stabilized, 0.5-meter telescope with a diffraction-limited optical system optimized for visible-to-near-UV wavelengths (300–900 nm).
• Integrate a high-stability pointing and control system to maintain sub-arcsecond image stability over extended exposures.
• Employ advanced image processing and wavefront sensing to correct for residual atmospheric and mechanical disturbances during flight.
• Conduct test flights to validate image stability, pointing accuracy, and instrument performance under stratospheric conditions.
• Design for modularity and rapid instrument replacement to support diverse scientific campaigns and technology testing.

Experimental results

Research questions

• RQ1 Can a balloon-borne telescope achieve sub-arcsecond image stability over a wide field of view in the visible-to-near-UV spectrum?
• RQ2 To what extent can super-pressure balloon platforms extend mission duration to support deep, long-exposure astronomical surveys?
• RQ3 How does the performance of a balloon-borne telescope compare to space-based observatories in key science areas like weak lensing and exoplanet spectroscopy?
• RQ4 Can a low-cost, high-stability platform like SuperBIT effectively complement future space missions such as Euclid and WFIRST?
• RQ5 What is the feasibility of using balloon-borne platforms for technology validation and space qualification of new instruments?

Key findings

• SuperBIT achieved 0.02" image stability over a 0.5-degree field of view during test flights, demonstrating sub-arcsecond performance at stratospheric altitudes.
• Two successful test flights confirmed the robustness and repeatability of the telescope’s pointing and stabilization system under long-duration flight conditions.
• The platform enables high-resolution, wide-field imaging in the visible-to-near-UV range, with significantly reduced atmospheric absorption compared to ground-based observatories.
• The super-pressure balloon platform extended flight duration to over 100 days, enabling long-exposure observations previously limited to space missions.
• SuperBIT provides a cost-effective alternative to space-based telescopes, operating at less than 1% of the cost of a comparable satellite mission.
• The mission demonstrates strong potential for enhancing science return in dark energy, dark matter, exoplanet studies, and galaxy evolution through UV photometry and high-resolution imaging.