Zenith Star Imaging at 90 km: Exploring Na Layer Footprints in the Focal Plane

DESCRIPTION

This study investigates the zenith imaging of stars within a 5 arcmin field of view (FOV) at an altitude of 90 km. We examine the sodium (Na) layers and their light characteristics, along with star footprints observed in the focal plane. Key parameters include a focus at 60m and 26m, ensuring clarity in light height distributions at 30m intervals. The angles involved are critical, including a zenith angle of 45°. The document emphasizes the importance of precise measurements and imaging techniques in astrophysical observations.

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Feb 15, 2026

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Zenith Star Imaging at 90 km: Exploring Na Layer Footprints in the Focal Plane

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Zenith, 90 km Na layer star Stars 5 arcmin fov 30m Na light 25.0m 51.8m 15 km 26.7m 44.5m 10 km 5 km 37.2m 28.3m 0 km 30.0m 30.0m nelson, Na footprints
Stars 5 arcmin fov Zenith angle 45°, 90 km Na layer 30m Na light height 25.0m 60.9m 15 km 26.7m 50.6m 10 km 5 km 40.3m 28.3m 0 km 30.0m 30.0m nelson, Na footprints
Star focal plane, 30m, f/15 0.5m star Na Na focus 1.60m at 45° Na focus 2.26m, zenith zenith Image in focal plane 5 arcmin FOV Image in intermediate plane 5 arcmin FOV Star and Na footprints near the focus for 5 arcmin FOV, f/15 beam nelson, Na footprints

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