2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/6128The BL Lacertae object H1426+428 is the most distant, confirmed source of TeV gamma rays. At a redshift of 0.129, its detection at TeV energies has important implications for estimating the density of the extragalactic infra-red background radiation. H1426+428 was observed extensively during the 2001/2002 observing season with the Whipple 10 m gamma-ray telescope. The results of these observations are presented here and are combined with the results of previous observations made between 1999 and 2001 at Whipple.4 pages to be published in the Proceedings of the 28th International Cosmic Ray Conference (Tsukuba, Japan 2003)Astrophysicstext