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Astrophysical Very-High-Energy (VHE, >10PeV) neutrinos deliver crucialinformation about the sources of Ultra-High-Energy Cosmic Rays (UHECRs), thecomposition of UHECRs, and neutrino/particle physics at highest energies.UHE-tau neutrinos skimming the Earth's surface produce tau leptons, which canemerge from the ground, decay, and start an upward-going extensive air shower(EAS) in the Earth's atmosphere. The tau neutrino can be reconstructed byimaging the EAS. We developed an atmospheric Cherenkov Telescope flying on theExtreme Universe Space Observatory Super Pressure Balloon 2 (EUSO-SPB2) missionto test the air-shower imaging concept at highest altitudes. The EUSO-SPB2ultra-long-duration balloon mission is a precursor of the Probe of ExtremeMulti-Messenger Astrophysics (POEMMA), a candidate for an astrophysicsprobe-class mission. The telescope implements Schmidt optics with a 0.785 m^2light collection area and a 512-pixel SiPM camera covering a 12.8{\deg} by6.4{\deg} (Horizontal by Vertical) field-of-view with 0.4{\deg} resolution. Thecamera signals are sampled with 100MSa/s and digitized with 12-bit resolution.The objectives of the EUSO-SPB2 Cherenkov telescope include a search for UHEneutrinos below Earth's limb, UHECRs above the limb, the study of the night skybackground, and studying the telescope's performance. In this presentation, Iwill present an overview of the Cherenkov telescope and discuss the in-flightperformance of the telescope.

The EUSO-SPB2 Cherenkov Telescope -- Flight Performance and Preliminary Results