A rocket-borne Ebert-Fastie spcectrometer was used to measure the dayglow O2(b1&Sgr;+g) atmospheric (0,0) band centered at 761.9nm. The tangent altitude for the observations ranged from 63 to 101 km. Analysis of the (0,0) band observations is presented. The peak intensity of the (0,0) band was 3.7¿0.2 megarayleigh at 87 km. The results were compared to a multiple-scattering radiative transfer model that includes a detailed photochemical calculation of the sources and sinks of the O2 excited state. The kinetic temperature was determined by analysis of the rotational development of the O2(0.0) band. The average temperature between 94 and 101 km was 1827¿K. ¿American Geophysical Union 1991