The Hubble diagram - a rediscussion

A rederivation of the deceleration parameter q0 basing on new observational data (Gunn and Oke 1075) and using more conventional analysis with a particular attention to the Scott effect is reported. The resulting value of q0 obtained on the assumption of no evolution is q0 obtained on the assumption of no evolution is q0=0.54+-0.52 or about 0.5 larger than that reported by Gunn and Oke. The additional uncertainty sets of photometric observations may also introduce an appreciable error into resulting q0. At present the Hubble diagram analysis is evidently not yet sufficient for discrimination between the open and closed universes. (author)