Ultra-broad wavelength coverage : operates primarily in the 100–1900 nm range, split into five channels (FUV, MUV, NUV, VIS, NIR) to optimize performance across wavelengths.
Very high spectral resolution : designed for R ≥ 75,000 (goal ~ 100,000), enabling detailed studies of narrow spectral lines in the ISM, stars, and galaxies.
Full spectropolarimetric capability : measures both linear and circular polarization (Stokes IQUV), a unique feature in the UV for probing magnetic fields.
Multi-channel architecture : uses separate polarimeter + echelle spectrograph chains per wavelength band, improving efficiency and optical performance.
Dual observing modes : can operate in spectropolarimetry or pure spectroscopy, with retractable polarimetric optics in most channels to optimize signal-to-noise.
Pinhole entrance in all five channels + 3 »slit in MUV-NUV
Extreme polarimetric precision and stability : targets polarization accuracy down to 10⁻⁴ (goal 10⁻⁶) and high radial velocity stability, critical for detecting weak magnetic signatures and exoplanet signals.
