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The payload of the Faint Intergalactic Redshifted Emission Balloon(FIREBall-2), the second generation of the FIREBall instrument (PI: C. Martin,Caltech), has been calibrated and launched from the NASA Columbia ScientificBalloon Facility (CSBF) in Fort Sumner, NM. FIREBall-2 was launched for thefirst time on the 22nd September 2018, and the payload performed the very firstmulti-object acquisition from space using a multi-object slit spectrograph(MOS). This performance-oriented paper presents the calibration and last groundadjustments of FIREBall-2, the in-flight performance assessed based on theflight data, and the predicted instrument's ultimate sensitivity. This analysispredicts that future flights of FIREBall-2 should be able to detect the HILy\alpha resonance line in galaxies at z~0.67, but will find it challenging tospatially resolve the circumgalactic medium (CGM).

End-to-end ground calibration and in-flight performance of the FIREBall-2 instrument