URAN

Ukrainian Radio Interferometer of NASU
	Antenna array of the URAN-2 low-frequency radio telescope.
Alternative names	URAN
Organization	Institute of Radio Astronomy of the National Academy of Sciences of Ukraine ;
Location	Ukraine
Telescopes	Ukrainian T-shaped Radio telescope, second modification ;
	[edit on Wikidata]

URAN (Ukrainian Radio Interferometer of NASU)^[1] (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 (built in 1975 in Zmiiv (Kharkiv oblast) ) and URAN-2 (construction started in 1979 in Stepanivka village near Poltava), URAN-3 is near Shatsk, in the north-west corner of Ukraine by the point where Poland and Belarus meet Ukraine, and URAN-4 (built in 1975) is in the south-west, a little west of Odesa and by the Moldovan border.

Auxiliary telescopes are URAN-1 has 96 dipoles in a 178 x 28m array; URAN-2 has 512 in a 238 x 118m; URAN-3 has 256 in a 238 x 58m; URAN-4 has 128 in 238 x 28m. 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.

URAN low-frequency VLBI system, UTR-2 and GURT radio telescopes on the map of Ukraine.
Geometrical configurations of the individual dipole antennas of the four URAN radio telescopes

^ Konovalenko, A.; Sodin, L.; Zakharenko, V.; Zarka, P.; Ulyanov, O.; Sidorchuk, M.; Stepkin, S.; Tokarsky, P.; Melnik, V. (2016-04-28). "The modern radio astronomy network in Ukraine: UTR-2, URAN and GURT". Experimental Astronomy. 42 (1): 11–48. Bibcode:2016ExA....42...11K. doi:10.1007/s10686-016-9498-x. ISSN 0922-6435.

[1] Konovalenko, A.; Sodin, L.; Zakharenko, V.; Zarka, P.; Ulyanov, O.; Sidorchuk, M.; Stepkin, S.; Tokarsky, P.; Melnik, V. (2016-04-28). "The modern radio astronomy network in Ukraine: UTR-2, URAN and GURT". Experimental Astronomy. 42 (1): 11–48. Bibcode:2016ExA....42...11K. doi:10.1007/s10686-016-9498-x. ISSN 0922-6435.

[1]