| Year: | 1999 |
| First: | 3 January |
| Last: | 27 December |
| Total: | 79 |
| Success: | 73 |
| Failed: | 6 |
| Catalogued: | 73 |
| Maidens: | Delta II 7320 Delta II 7426 Dnepr Long March 2F Long March 4B Zenit-3SL |
| Retired: | Ariane 4 40 Athena II H-II |
| Orbital: | 4 |
| Totalcrew: | 22 |
| Firstsat: |
| Programme: | Timeline of spaceflight |
| Previous Mission: | 1998 |
| Next Mission: | 2000 |
The table below shows 208 satellite launches were made in 1999. 81 (39%) of these launches were communications satellites.
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| Date (GMT) | Spacecraft | Event | Remarks |
|---|---|---|---|
| 1 February | 11th flyby of Europa | ||
| 5 May | Galileo | 4th flyby of Callisto | |
| 24 June | Gravity assist
| ||
| 30 June | Galileo | 5th flyby of Callisto | |
| 29 July | Flyby of 9969 Braille | ||
| 31 July | Deliberate impact of the Moon | ||
| 14 August | Galileo | 6th flyby of Callisto | |
| 18 August | Cassini | Flyby of the Earth | Gravity assist; Closest approach: |
| 16 September | Galileo | 7th flyby of Callisto | |
| 23 September | Burned up in the Martian atmosphere | ||
| 11 October | Galileo | 1st flyby of Io | |
| 26 November | Galileo | 2nd flyby of Io | |
| 3 December | Crash-landed at Planum Australe, Mars | ||
| 3 December | Amundsen and Scott | Subprobes lost in Mars Polar Lander crash-landing |
| Start Date/Time | Duration | End Time | Spacecraft | Crew | Function | Remarks | |
|---|---|---|---|---|---|---|---|
| 16 April 04:37 | 6 hours | 10:56 | Mir EO-27 Kvant-2 |  Viktor Afanasyev | Recovered experiments from the exterior of Mir and installed other experiments on the outer surface.[1] | ||
| 30 May 02:56 | 7 hours 55 minutes | 10:51 | STS-96 |  Tamara E. JerniganDaniel T. Barry | Transferred and installed two cranes from the shuttle's payload bay to locations on the outside of the station. Installed two new portable foot restraints that will fit both American and Russian space boots, and attached three bags filled with tools and handrails that will be used during future assembly operations.[2] | ||
| 23 July 11:06 | 6 hours 7 minutes | 17:13 | Mir EO-27 Kvant-2 | Viktor AfanasyevSergei Avdeyev | Installed a communications antenna on the Sofora girder, and attempted to find a leak in Kvant-2. Retrieved the Exobiology and Dvikon experiments.[3] | ||
| 28 July 09:37 | 5 hours 22 minutes | 14:59 | Mir EO-27 Kvant-2 | Viktor AfanasyevSergei Avdeyev | Completed the deployment of the antenna mounted on the Sofora girder and pushed it into space. Installed the experiments Indicator and Sprut-4, traded out tape cassettes on the Migmas ion spectromer and recovered the Danko-M and Ekran-D experiments for return to Earth.[4] | ||
| 22 December 18:54 | 8 hours 15 minutes | 03:09 | STS-103 Discovery | Steven SmithJohn M. Grunsfeld | Replaced three Rate Sensor Units, installed Voltage/Temperature Improvement Kits on all six batteries.[5] | Hubble Space Telescope servicing | |
| 23 December 19:06 | 8 hours 10 minutes | 24 December 03:16 | STS-103 Discovery | /Michael Foale Claude Nicollier | Replaced the telescope's central computer and a Fine Guidance Sensor. | Hubble Space Telescope servicing | |
| 24 December 19:17 | 8 hours 8 minutes | 25 December 03:25 | STS-103 Discovery | Steven SmithJohn M. Grunsfeld | Installed a transmitter and a solid state recorder. | Hubble Space Telescope servicing |