December (continued
- Dec 13 - Geminids Meteor Shower Peak
- Dec 13 - Asteroid 162361 (2000 AF6) Near-Earth Flyby (0.074 AU)
- Dec 14 - Asteroid 2006 VB14 Near-Earth Flyby (0.093 AU)
- Dec 14 - Asteroid 5036 Tuttle Closest Approach To Earth (2.018 AU)
- Dec 14 - 5th Anniversary (2003), Nozomi, Mars Flyby
- Dec 15 - Orbiting Carbon Observator (OCO) Taurus Launch
- Dec 15 - Asteroid 2006 KZ39 Near-Mercury Flyby (0.044 AU)
- Dec 15 - Asteroid 4116 Elachi Closest Approach To Earth (0.978 AU)
- Dec 15 - Asteroid 447 Valentine Closest Approach To Earth (1.926 AU)
- Dec 15-19 -] American Geophysical Society Fall Meeting, San Francisco, California
- Dec 16 - Asteroid 4150 Starr Closest Approach To Earth (1.444 AU)
- Dec 16-21 - Conference on Elementary Particles, Astrophysics, and Cosmology, Miami, Florida
- Dec 17 - Cassini, Orbital Trim Maneuver #178 (OTM-178)
- Dec 17 - Asteroid 5203 Pavarotti Closest Approach To Earth (1.556 AU)
- Dec 17 - 50th Anniversary (1958), Project Mercury Created
- Dec 17 - 105th Anniversary (1903), Wright Brothers' First Airplane Flight
- Dec 18 - Asteroid 6223 Dahl Closest Approach To Earth (1.657 AU)
- Dec 19 - Comet Tsuchinshan 2 Near-Jupiter Flyby (0.328 AU)
- Dec 19 - 210th Anniversary (1798), Benares Meteorite Fall (Hit House in India)
- Dec 20 - Asteroid 2004 XL14 Near-Earth Flyby (0.061 AU)
- Dec 21 - Cassini, Titan Flyby
- Dec 21 - Winter Solstice, 21:12 UT
- Dec 21 - 30th Anniversary (1978), Venera 12, Venus Landing
- Dec 21 - 40th Anniversary (1968), Apollo 8 Launch (Frank Borman, Jim Lovell and Bill Anders)
- Dec 22 - Ursids Meteor Shower Peak
- Dec 22 - Asteroid 8103 Fermi Closest Approach To Earth (2.111 AU)
- Dec 22 - 20th Anniversary (1988), Discovery of the LEW 88516 Meteorite (Mars Meteorite)
- Dec 23 - Asteroid 1221 Amor Closest Approach To Earth (1.084 AU)
- Dec 23 - Asteroid 18106 Blume Closest Approach To Earth (1.549 AU)
- Dec 24 - Cassini, Orbital Trim Maneuver #179 (OTM-179)
- Dec 24 - Asteroid 232 Russia Closest Approach To Earth (1.703 AU)
- Dec 24 - Deep Space Network's 45th Birthday (1963)
- Dec 25 - Asteroid 4055 Magellan Closest Approach To Earth (1.306 AU)
- Dec 25 - 5th Anniversary (2003), Mars Express, Mars Orbit Insertion
- Dec 25 - 30th Anniversary (1978), Venera 11, Venus Landing
- Dec 27 - Asteroid 2004 LV3 Near-Earth Flyby (0.069 AU)
- Dec 27 - Asteroid 7032 Hitchcock Closest Approach To Earth (1.094 AU)
- Dec 27 - Asteroid 39382 Opportunity Closest Approach To Earth (2.273 AU)
- Dec 28 - Asteroid 2006 JY26 Near-Earth Flyby (0.096 AU)
- Dec 28 - Asteroid 6336 Dodo Closest Approach To Earth (1.435 AU)
- Dec 28 - Asteroid 18932 Robinhood Closest Approach To Earth (1.796 AU)
- Dec 29 - Moon Occults Jupiter
- Dec 31 - Asteroid 51826 Kalpanachawla Closest Approach To Earth (1.901 AU)
