{"paper":{"title":"A Supernova at z = 0.458 and Implications for Measuring the Cosmological Deceleration","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A. G. Kim, A. Goobar, B. J. Boyle, C. R. Pennypacker, C. S. Crawford, D. Carter, G. Goldhaber, H. J. M. Newberg, I. A. Small, J. Desai, J. R. Mould, K. Glazebrook, M. J. Irwin, M. Y. Kim, P. S. Bunclark, R. A. Muller, R. G. Abraham, R. G. McMahon, R. J. Terlevich, R. S. Ellis, S. Perlmutter, T. A. Small, W. J. Couch","submitted_at":"1995-05-04T22:10:19Z","abstract_excerpt":"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. We report here our first discovery, a supernova at $z = 0.458$. The photometry for this supernova closely matches the lightcurve calculated for this redshift from the template of well-observed nearby Type Ia supernovae. We discuss the measurement of the deceleration parameter $q_0$ using such high-redshift supernovae, and give the best fit value assuming this one supernova is a normal, unextincted Type Ia. We describe the main sources of error in such"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9505023","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}