Question: How many scientists are on the staff of the space agency with a space telescope project that was headed by Alexandr Boyarchuk ?

text: List of space telescopes
Ultraviolet
Further information : Ultraviolet astronomy Ultraviolet telescopes make observations at ultraviolet wavelengths , i.e . between approximately 10 and 320 nm . Light at these wavelengths is absorbed by the Earth 's atmosphere , so observations at these wavelengths must be performed from the upper atmosphere or from space . [ 104 ] Objects emitting ultraviolet radiation include the Sun , other stars and galaxies . [ 105 ]
This list of space telescopes (astronomical space observatories) is grouped by major frequency ranges: gamma ray, x-ray, ultraviolet, visible, infrared, microwave and radio. Telescopes that work in multiple frequency bands are included in all of the appropriate sections. Space telescopes that collect particles, such as cosmic ray nuclei and/or electrons, as well as instruments that aim to detect gravitational waves, are also listed. Missions with specific targets within the Solar System (e.g. our Sun and its planets), are excluded; see List of Solar System probes for these, and List of Earth observation satellites for missions targeting our planet. Two values are provided for the dimensions of the initial orbit. For telescopes in Earth orbit, the min and max altitude are given in kilometers. For telescopes in solar orbit, the minimum distance (periapsis) and the maximum distance (apoapsis) between the telescope and the center of mass of the sun are given in astronomical units (AU).
Name Space Agency Launch Date Terminated Observing Location
OAO-2 ( Stargazer ) NASA 7 Dec 1968 Jan 1973 Earth orbit ( 749-758 km )
Orion 1 and Orion 2 Space Observatories USSR 19 Apr 1971 ( Orion 1 ) ; ( Orion 2 ) 18 Dec 1973 1971 ; 1973 Earth orbit ( Orion 1 : 200-222 km ; Orion 2 : 188-247 km )
Far Ultraviolet Camera/Spectrograph ( UVC ) NASA 16 Apr 1972 23 Apr 1972 Descartes Highlands on lunar surface
OAO-3 Copernicus NASA 21 Aug 1972 Feb 1981 Earth orbit ( 713-724 km )
Astronomical Netherlands Satellite ( ANS ) SRON 30 Aug 1974 Jun 1976 Earth orbit ( 266-1176 km )
International Ultraviolet Explorer ( IUE ) ESA & NASA & SERC 26 Jan 1978 30 Sep 1996 Earth orbit ( 32,050-52,254 km )
Astron IKI 23 Mar 1983 Jun 1989 Earth orbit ( 2,000-200,000 km )
Hubble Space Telescope NASA & ESA 24 Apr 1990 - Earth orbit ( 586.47-610.44 km )
Broad Band X-ray Telescope / Astro 1 NASA 2 Dec 1990 11 Dec 1990 Earth orbit ( 500 km )
Extreme Ultraviolet Explorer ( EUVE ) NASA 7 Jun 1992 31 Jan 2001 Earth orbit ( 515-527 km )
Astro 2 NASA 2 Mar 1993 18 Mar 1993 Earth orbit ( 349-363 km )
Far Ultraviolet Spectroscopic Explorer ( FUSE ) NASA & CNES & CSA 24 Jun 1999 12 Jul 2007 Earth orbit ( 752-767 km )
Cosmic Hot Interstellar Spectrometer ( CHIPS ) NASA 13 Jan 2003 11 Apr 2008 Earth orbit ( 578-594 km )
Galaxy Evolution Explorer ( GALEX ) NASA 28 Apr 2003 28 Jun 2013 Earth orbit ( 691-697 km )
Korea Advanced Institute of Science and Technology Satellite 4 ( Kaistsat 4 ) KARI 27 Sep 2003 2007 ? Earth orbit ( 675-695 km )
Swift Gamma Ray Burst Explorer ( Swift ) NASA 20 Nov 2004 - Earth orbit ( 585-604 km )
Interface Region Imaging Spectrograph ( IRIS ) NASA 27 Jun 2013 - Earth orbit
Hisaki ( SPRINT-A ) JAXA 14 Sep 2013 - -
Venus Spectral Rocket Experiment NASA 26 Nov 2013 reusable suborbital to 300 km
Lunar-based ultraviolet telescope ( LUT ) CNSA 1 Dec 2013 - Lunar surface