Uhuru


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Uhuru

(oo-hoor -oo) (‘Freedom’ in Swahili) The first artificial Earth satellite for X-ray astronomy (SAS–1), launched into a 500 km circular equatorial orbit in December 1970 from the San Marco platform off the coast of Kenya. Two sets of proportional gas counters, each 840 cm2 in area and mounted on opposite sides of the slowly spinning spacecraft, scanned the sky for X-ray sources. Uhuru provided the first detailed X-ray sky map, leading to the 3U catalog of 161 sources, published in 1974. Its most important discoveries were of X-ray binaries (Cen X-3, Her X-1, etc.) and of extended regions of X-ray emission associated with clusters of galaxies. Uhuru operated successfully until July 1971, when its transmitter failed. The 3U catalog is based on the data to that time. Subsequently the star sensors, used to determine the precise attitude of the spacecraft and hence the sky coordinates of each X-ray source, also degraded; surveying recommenced in Dec. 1971, however, after partial transmitter recovery. These later observations, with the aid of a magnetometer attitude solution, continued until Apr. 1973, when the Uhuru battery failed. All the Uhuru observations were finally put together to form the 4U catalog, issued in 1978 and containing 339 X-ray sources.
References in periodicals archive ?
He said the historic handshake between Uhuru and Raila last week will play a key role in addressing the worrying trends that bother all Kenyans.
Mwai Kibaki, who would later that year whitewash Uhuru in the presidential election, was in the opposition with Charity Ngilu and Michael Wamalwa.
The project will see Uhuru Energy setting up integrated solar photovoltaic power plants with a total capacity of 310 megawatts.
Speaking in Juba on Tuesday - during a one-day official visit in which he held a closed door meeting with President Kiir - President Uhuru also said Kenya will help South Sudan to restore law and order.
During New York City's gay pride parade in June, Uhuru members marched under their own banner as gay Africans--a first in the parade's 30-plus-year history.
His new name, Uhuru, is Swahili for ``freedom,'' Hedren said.
Jihad Shaheed Uhuru, the author of Wake Up Everybody, published his autobiographical novel for at-risk young, black men.
NASA co-principals will meet President Uhuru Kenyatta when he jets back into the country from Cuba, Wiper leader Kalonzo Musyoka has said.
By NATION REPORTERbrLawyer Miguna Miguna has accused Nasa leader Raila Odinga of betraying Kenyans by pledging to work with President Uhuru Kenyatta.
At present, Uhuru Child has three UNC students working as interns.
Will it be his chosen heir Uhuru Kenyatta (opposite page) or his sworn opponent Mwai Kibaki (this page).