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Above: Spektr-UF space observatory. Copyright © 2010 Anatoly Zak
Previous chapter: Spektr-RG
Russia to take a lead in ultraviolet astronomy
The Spektr-UF spacecraft will become the third in a series of large orbital telescopes developed in the post-Soviet Russia. Also known as World Space Observatory Ultraviolet, WSO-UV, the satellite was designed to see the sky in ultraviolet light impossible on the surface of the Earth. The same filtering effect of the atmosphere protecting life from harmful radiation also blocks the view of dramatic phenomena playing out in the Universe in most ranges of electromagnetic spectrum, including ultraviolet, or UV. As a result, since 1970s, the ultraviolet astronomical observations have been delegated to space observatories, orbiting the Earth beyond its atmosphere.
Spacecraft and its program
Scientific capabilities of the Spektr-UF spacecraft were promised to be unmatched by any other instrument at the time. (452) Even though it would be physically smaller than its main predecessor -- Hubble Space Telescope, HST -- Spektr-UF's telescope will be an order of magnitude more sensitive than a UV-sensitive instrument on the Hubble. Hubble's official successor -- James Webb Space Telescope, funded by NASA and ESA and scheduled to fly around the same timeframe as Spektr-UF in the second half of 2010s, was designed to conduct observations in the infra-red range of spectrum, leaving ultraviolet light "beyond its view." With its ultraviolet vision, the Spektr-UF promised to benefit two crucial fields in astrophysics: the formation of stars and planetary systems and the cosmological and chemical evolution of the interstellar and intergalactic medium. (609)
The spacecraft would carry a Russian-built T-170M telescope with a mirror diameter of 1.7 meters. (T-170M is a smaller, lighter version of its predecessor -- T-170 -- which never had a chance to fly in the wake of the post-Soviet economic turmoil.) Light captured by the instrument would be directed into three spectrometers sensitive to wavelengths from 102 to 310 nanometers. They were designed to register cosmic plasma with temperatures of several ten thousands Kelvin and atomic transition lines of all important atoms and molecules like H2, CO, OH and others. This capability would allow an international team of scientists to study formation of galaxies and analyze the atmospheres of exoplanets (planets outside our solar system) and protoplanetary discs.
In the first two years of its mission, Spektr-UF will spend 40 percent of its observation time for the so-called "base program" compiled by the project's main scientific committee. A half of available observation time will be split between astronomers from countries-members of the Spektr-UF project, proportional to their nations' investments. Finally, remaining 10 percent would be dedicated to the "open" program to fulfill "outstanding" proposals selected by the scientific committee among requests by non-participating parties.
As of 2011, Spanish, German and Ukrainian scientists were expected to participate in the mission. The flight control and science data receiving facilities for the project were to be deployed in Russia and Spain. Between 2007 and 2011, Kazakh and Russian space officials discussed a possible ground station in Kazakhstan for receiving and processing data from Spektr-UF, as Kazakh contribution into the project. (605)
Origin of the project
In March 1983, the USSR launched the Astron orbital observatory developed in cooperation with France. The spacecraft carried a UV telescope dubbed Spika sporting the main mirror with a diameter of 0.8 meters. The Astron project was a brainchild of a team led by Andrei Severny, the head of the Crimean Astrophysics Observatory, KrAO. Severny and his colleagues A. Boyarchuk and L. Granitsky marshaled the Astron project through all stages of development, despite a skepticism of Vechaslav Kovtunenko, an influential chief designer at NPO Lavochkin, the main contractor on the project. At the time when spacecraft developers such as NPO Lavochkin would often trump plans of their clients in the scientific community, Severny resorted to writing a lobbying letter to the Central Committee of the Communist Party, essentially forcing Kovtunenko to comply.
The Astron spacecraft ended up at the right place at the right time to watch spectacular Supernova 1987A. Unfortunately, scientific effectiveness of the Astron project was hampered by a very limited availability of a single ground receiving antenna in Yevpatoria on the Crimean Peninsula. As a result, the scientific return from the spacecraft was largely overshadowed by data from the Western IUE spacecraft, featuring a telescope half of a diameter of the Astron's. IUE was supported by a pair of ground antennas at Goddard Space Flight Center in the US and at Villa Franka in Spain. The data from the space observatory was stored in a centralized archive, which was much easier accessible to scientists around the world than the information from the Soviet sp acecraft. (611)
Astron ceased functioning in June 1989, by which time, Soviet scientists had conceived a much larger UV-telescope christened Spektr-UF, where Spektr (Spectrum) was a name for the whole series of space observatories, while UF stood for the Russian "Ultra-Fioletovy" -- ultraviolet. According to the original plan, Spektr-UF would be an almost six-ton spacecraft carried into a high elliptical Earth orbit by the Proton rocket in 1997. This time, Russian astrophysicists hoped to lead a truly international effort with the data from the spacecraft widely shared among the world's scientific community.
Like most post-Soviet space projects, Spektr-UF went through several painful incarnations and delays caused by funding problems and changing priorities within the Russian space program. For almost two decades, Spektr-UF was standing in line to the launch pad behind the Spektr-RG X-ray observatory and the Spektr-R radiotelescope. The stalled scientific program of Spektr-UF ended up in the lap of a small and underfunded team led by Boris Shustov at the Institute of Astronomy, INASAN, in Moscow. Around 2003, NPO Lavochkin had to dramatically scale down Spektr-UF and re-design it around its standard Navigator service module, so the whole spacecraft could fit into a smaller, cheaper rocket than Proton.
In 2004, when discernable Russian funding for the project started flowing, one source promised the launch of Spektr-UF as early as 2008 into an orbit around Lagrange L2 point, some 1.5 million kilometers behind the Earth along the line extending from the Sun. At that location, the spacecraft would avoid constant passes through the shadow of the home planet and thus keep ultra-delicate optics free of severe temperature swings. This orbit would also enable the so-called spectroscopic monitoring which is in high demand by the astronomical community and difficult to carry out with the Hubble Space Telescope due to its low Earth orbit. (609) As a drawback, deploying the spacecraft in L2 point would require more than one ground station to control the mission, which would inevitably lead to a higher cost of the whole project. (611) As a result by 2006, Spektr-UF was promised to lift off in late 2011 on the Zenit-3M/Fregat-SB rocket into a geosynchronous circular orbit with an altitude of 35,786 kilometers and an inclination of 51.6 degrees toward the Equator for a decade-long mission. At the time, the launch of Spektr-UF was expected on the Zenit-2SB rocket, however an ever-cheaper Chinese LM-3B rocket was also under consideration. (608)
In 2009, the mission slipped to 2013 as the earliest, while none of the critical hardware for the project was ready and neither was testing infrastructure required to test those systems. In addition, Germany was not able to fund a pair of UV-spectrographs, leaving the project without critical instruments. At the time, the assembly of the Navigator service module for the observatory was not expected to start until 2010.
In 2010, the project was delayed again to 2014, and even that date was according to most optimistic scenarios. In May 2011, the launch was expected no earlier than by the end of 2014. By July 2011, a newly appointed head of the Russian space agency, Vladimir Popovkin, was quoted promising the mission in 2015.
In the meantime, according to sources in Germany, cost overruns in the preceding Spektr-RG project consumed funding reserved for the German participation in the Spektr-UF mission. Germany was expected to supply a spectrography package for the project, however following the nation's withdrawal, Russian VNIIEF institute took over this responsibility beginning in 2011.
In May 2012, a publication of the Moscow Physical and Technical Institute, MIFTI, quoted Deputy Director of the Astronomy Institute, INASAN, Dmitry Bisikalo as saying that Spektr-UF was scheduled for launch in 2016. (571)
In 2012, Roskosmos ordered the manufacturing of the Proton-M/Briz-M rocket for the mission with a completion date in November 2014, thus switching the launch from Zenit. In the same year, NPO Lavochkin issued its first press-release dedicated to the Spektr-UF mission. On October 17, the company announced that it had completed tests of the antenna system on a dedicated antenna prototype of the Spektr-UF spacecraft. The company had also built a prototype of the observatory intended for structural tests and tested it for expected static, vibration and transportation loads. Lavochkin was also completing the construction of prototypes intended to test the thermal control system.
After years of delays, the flight version of the T-170M telescope was also being manufactured. In parallel, the Institute of Astronomy, INASAN, was working on technical prototypes of Russian science spectrograph and associated avionics which were scheduled for delivery to Lavochkin in 2013, the company said.
(To be continued)
Next chapter: Gamma-400
Evolution of the Spektr-UV project:
Specifications of the T-170M telescope onboard Spektr-UF spacecraft:
Spektr-UF development team:
Foreign participation in the Spektr-UF project (planned and under consideration during the development of the project) (610):
This page is maintained by Anatoly Zak; Last update: March 21, 2013
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A full-scale prototype of the European TD-1A satellite, which regis ted ultraviolet radiation from 60,000 starts from March 1972 to May 1974. Copyright © 2009 Anatoly Zak
A german-built ORFEUS-SPAS platform carrying a cluster of ultraviolet telescopes was deployed and retrieved by the Space Shuttle in 1993 and 1996. Copyright © 2010 Anatoly Zak
A body of a 0.8-meter Spika UV-telescope for the Astron orbital observatory built by NPO Lavochkin. Copyright © 2000 Anatoly Zak
Evolution of the Spektr UF (UFT) spacecraft during the 1990s, when it was based on the AM module. Credit: NPO Lavochkin
Development of the telescope for the Spektr-UF project circa 1995. Credit: NPO Lavochkin
A scale model of the Spektr UF telescope in its circa 2000 configuration. Click to enlarge. Copyright © 2008 Anatoly Zak
Around 2004, a Chinese LM-3B rocket was considered as a launcher for Spektr-UF. Copyright © 2005 Anatoly Zak
If launched around 2016, Spektr-UF could become the main tool of ultraviolet astronomy after the retirement of Hubble Space Telescope, HST. Copyright © 2011 Anatoly Zak
The main mirror of the Spektr-UF's telescope during processing circa 2012.
Assembly of Spektr-UF circa 2012. Credit: NPO Lavochkin