2003

February

• February 5: Eukelade, S/2003 J 2, Eupheme, S/2003 J 4, and Narvi are discovered.
• February 6: Eirene, Helike, S/2003 J 9, S/2003 J 10, Kallichore, S/2003 J 18, S/2003 J 19, Mneme, and S/2003 J 23 are discovered.
• February 8: Aoede, Hegemone, S/2003 J 12, Kore, Philophrosyne, S/2003 J 16, and Herse are discovered.
• February 9: Cyllene, Carpo, and Thelxinoe are discovered.

August

• August 13: Ferdinand and Francisco are discovered.
• August 14: Neso is discovered.
• August 25: Mab and Cupid are discovered.
• August 29: Psamathe and Margaret are discovered.

September

• 21 September: Galileo crashes into Jupiter.

November

• 14 November: Sedna is discovered.