Long-slit cross-dispersion spectroscopy for Hyperion UV space telescope

Heejoo Choi, Isaac Trumper, Yi Ting Feng, Hyukmo Kang, Joel Berkson, Haeun Chung, Erika Hamden, Dae Wook Kim

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Molecular clouds are a crucial stage in the lifecycle of a star, and the far ultraviolet (FUV) spectral range is a prime observation band. Hyperion is an FUV space telescope that investigates the birth clouds of stars using a high-resolution spectrometer. To meet the scientific requirements, we developed and evaluated a spectrometer that covers the 140.5 to 164.5 nm wavelength range with a spectral resolution higher than 30,000. We employed on-axis and on-plane dispersive optic layouts to control the aberration from a large aspect ratio slit (10 arcmin × 2.5 arcsec, aspect ratio R = 240). The cross-dispersion isolates three orders from the échelle grating (n =-19,-18, and-17), and the subsequent two-mirror freeform imaging optics form a two-dimensional spectral distribution on a 50 mm × 50 mm detector array. The geometrical and spectral performances of this innovative design are evaluated.

Original languageEnglish (US)
Article number014006
JournalJournal of Astronomical Telescopes, Instruments, and Systems
Issue number1
StatePublished - Jan 1 2021


  • far-UV spectroscopy
  • freeform optic
  • space telescope
  • Échelle grating

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Control and Systems Engineering
  • Instrumentation
  • Astronomy and Astrophysics
  • Mechanical Engineering
  • Space and Planetary Science


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