HS-ANET: Star Spectral Type Enhanced Astrometric Calibration for Hyper Spectral Space Imaging

TL;DR

This paper introduces HS-ANET, an enhanced astrometric calibration method that uses spectral type information from hyperspectral images to improve star field matching accuracy and efficiency in space imaging.

Contribution

It extends traditional geometric star matching algorithms by integrating spectral data, significantly reducing the number of stars needed for accurate spacecraft orientation.

Findings

Improved match success rates in cluttered star fields

Reduced failure cases in ambiguous star configurations

Enhanced robustness and efficiency in star identification

Abstract

Traditional lost-in-space algorithms, such as those implemented in astrometry.net, solve for spacecraft orientation by matching observed star fields to celestial catalogs using geometric asterisms alone. In this work, we propose a novel extension to astrometry.net that incorporates stellar spectral type, which is derived from hyperspectral imagery, into the matching process. By adding this spectral dimension to each star detection, we constrain the search space and improve match specificity, enabling successful astrometric solutions with significantly fewer stars. Our modified pipeline demonstrates improved fit rates and reduced failure cases in cluttered or ambiguous star fields, which is especially critical for autonomous space situational awareness and traffic management. Our results suggest that modest spectral resolution, when incorporated into existing geometric frameworks, can dramatically improve robustness and efficiency in onboard star identification systems.