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We have begun a program to discover high-redshift supernovae ($z \approx$0.25--0.5), and study them with follow-up photometry and spectroscopy. Wereport here our first discovery, a supernova at $z = 0.458$. The photometry forthis supernova closely matches the lightcurve calculated for this redshift fromthe template of well-observed nearby Type Ia supernovae. We discuss themeasurement of the deceleration parameter $q_0$ using such high-redshiftsupernovae, and give the best fit value assuming this one supernova is anormal, unextincted Type Ia. We describe the main sources of error in such ameasurement of $q_0$, and ways to reduce these errors.

A supernova at Z = 0.458 and implications for measuring the cosmological deceleration