List of minor planets and comets visited by spacecraft

Columns: Name | Diameter | Year of discovery | Agency | Proposed year | Notes
99942 Apophis | 370 m | 2004 | CNAS | Launch : ~2022 | Flyby | 169P/NEAT | 1871 | CNAS | Launch : ~2022 | Flyby | ( 175706 ) 1996 FG3 | 1,550 m | 1996 | CNAS | Launch : ~2022 | Sample-return | ( 172034 ) 2001 WR1 | 660 m | 2001 | JAXA | Flyby : 2023 | Potential mission extension of Hayabusa2 spacecraft | ( 138971 ) 2001 CB21 | 2001 | NASA | Flyby : 2022 | Potential flyby during transit by DART spacecraft | 67P/Churyumov-Gerasimenko | 4.1×3.3×1.8 km | 1969 | NASA | Launch : 2024 | CONDOR , a proposed asteroid sample-return mission . Not selected for launch | 88P/Howell | 4.4 km | 1981 | NASA | Launch : 2024 | CORSAIR , a proposed comet sample-return mission . Not selected for launch | 67P/Churyumov-Gerasimenko | 4.1×3.3×1.8 km | 1969 | NASA | Launch : 2024 | CAESAR , a proposed comet sample-return mission | 65803 Didymos | 170 m | 1996 | ESA-NASA | Launch : 2023 | AIDA , a proposed asteroid impactor and orbiter | Trojan asteroids | 1906 | JAXA | Launch : 2026 | OKEANOS , a proposed multiple flyby mission to Jupiter 's Trojan asteroids using solar sail propulsion | 2 Pallas | 512 km | 1779 | NASA | Launch : 2022 Flyby : 2024 | Athena , a proposed flyby of Pallas | 10199 Chariklo | 330 km | 1997 | NASA | Camilla , a mission concept for a flyby and impactor

Example questions:
What is the diameter of the small planet/comet that has a rotation period of approximately 12.4 hours ? | What is the diameter of the small planet/comet that caused a brief period of concern in December 2004 ? | What is the diameter of the small planet/comet that 's next occurrence will be in 2020 ? | What is the diameter of the small planet/comet that has a rotation period of 8.0 hours and possibly an elongated shape ?

Answers:
4.1×3.3×1.8 km | 370 m | 4.4 km | 660 m