The Spektr-UV, also known as World Space Observatory-Ultraviolet (WSO-UV), is a proposed ultraviolet space telescope intended for work in the 115 nm to 315 nm wavelength range. The launch had initially been planned for 2007, but has since been continually delayed; as of February 2023, the launch is planned for the end of 2028 atop an Angara A5M rocket from Vostochny Cosmodrome.
The main instrument of the observatory is a 1.7-metre Ritchey–Chrétien telescope. The telescope will be equipped with the following instruments:
WSO-UV Spectrographs Unit (WUVS) (Russia/Japan)
The WUVS spectrographs assembly consists of four channels:
- Vacuum Ultraviolet Echelle Spectrograph, VUVES (Russia): The FUV high-resolution spectrograph (VUVES) provides echelle spectroscopy capabilities with high resolution (R ~ 50 000) in the 115–176 nm range.
- Ultraviolet Echelle Spectrograph, UVES (Russia): The NUV high-resolution spectrograph (UVES) provides echelle spectroscopy capabilities with R ~ 50 000 in the 174–310 nm range.
- Long-Slit Spectrograph, LSS (Russia): The Long-Slit Spectrograph (LSS) provides low resolution (R ~ 1000), long slit spectroscopy in the 115–305 nm range. The spatial resolution is better than 0.5 arcsec(0.1 arcsec as the best value).
- UV Spectrograph for observation of Earth-like Exoplanets, UVSPEX (Japan)
WSO-UV Field Camera Unit (FCU) (Russia/Spain)
The FCU has two channels, each fed by an independent pick off mirror:
- Field Camera Unit FUV channel (FCU/FUV) (Russia/Spain): The far UV (FUV) channel has capabilities for high resolution imaging through the MCP detector, scale 0,047 arcsec/pixel in 115–190 nm range.
- Field Camera Unit UVO channel (FCU/UVO) (Russia): The UV-optical (UVO) channel is designed for wide field imaging through the CCD detector, scale 0,146 arcsec/pixel in 185–810 nm range.
Proposed and former instruments
- Stellar Coronograph for Exoplanet Direct Imaging, SCEDI (NAOJ, Rikkyo University, Japan).
- HIRDES (High-Resolution Double Echelle Spectrograph): R~55000 spectroscopy of point sources in the 102–320 nm range (Germany). Germany exited the Spektr-UV programme due to financial problems, so Russia replaced HIRDES with WUVES.
- ISSIS (Imaging and Slitless Spectroscopy Instrument for Surveys) was being developed to carry out UV and optical diffraction limited imaging of astronomical objects. The ISSIS would have incorporated three channels: High Sensitivity Far-UV Channel: 120–200 nm; Channel for Surveys (FUV): 120–600 nm, optimized for 120–270 nm; Channel for Surveys (UVO): 120–600 nm, optimized for 270–600 nm (Spain). Due to financial problems, Spain canceled ISSIS, and limited participation in Spektr-UV program to ground segment and supply of detectors for FCU. Russia replaced ISSIS with FCU.
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. (August 2019)
In October 2012, tests of antennas for the space telescope were completed.
In July 2019, INASAN selected the first seven experiments to be performed by the observatory.
Spektr-UV is an international project led by Russia (Roscosmos).
At present the international cooperation includes three basic participants: Russia (will provide the telescope, spacecraft, launch facilities, ground segment); Spain (FCU detectors, ground segment); Japan (UVSPEX).
Russian space observatories
Soviet and Russian space program