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X-ray telescope
3 satellites and probes
| Spacecraft | Launch | Operator | Launch vehicle |
|---|---|---|---|
 Space Variable Objects Monitor | June 22, 2024 | National Space Science Center | Long March 2C |
 Spektr-RG | July 13, 2019 | Roscosmos State Corporation, German Aerospace Center | Proton-M |
 ROSAT | June 1, 1990 | German Space Operations Center | Delta II |