High Quality Content by WIKIPEDIA articles! The first astronomical X-ray source discovered in the constellation Triangulum Australe appears to have been 3U 1626-67, later confirmed as 4U 1626-67. The catalog abbreviation 3U stands for the third X-ray observatory satellite Uhuru catalog of discrete X-ray sources. X-ray sources in the third Uhuru catalog were detected prior to August 27, 1973; therefore, its discovery and observation precedes Triangulum Australe X-1.

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