URAN

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URAN (Ukrainian Radio Interferometer of NASU) (Ukrainian: Український Радіоіонтеферометр Академії Наук - УРАН) is an array of radio-telescopes, spread across Ukraine and used for long-baseline interferometry in the 8–40 MHz range. The most sensitive of the telescopes is UTR-2. URAN-1 was built in 1975 in Zmiiv, Kharkiv oblast. URAN-2 was constructed starting in 1979 in Stepanivka village near Poltava. URAN-3 is near Shatsk, in the north-west, near the border with Poland and Belarus. URAN-4 was built in 1975 and is in the south-west, west of Odesa, by the Moldovan border. Auxiliary telescopes are: URAN-1, with 96 dipoles in a 178 by 28 metres (584 ft × 92 ft) array; URAN-2, with 512 dipoles in a 238 by 118 metres (781 ft × 387 ft) array; URAN-3, with 256 dipoles in a 238 by 58 metres (781 ft × 190 ft) array; and URAN-4, with 128 dipoles in a 238 by 28 metres (781 ft × 92 ft) array. Because of the small number of baselines, images from URAN tend to be produced by model-fitting to sums of Gaussians rather than by direct synthesis.