Asteroids discovered on December 21
33 named asteroids.
| # | Asteroid | Discovered | Discoverer |
|---|---|---|---|
| 1 | (1509) Esclangona | 1938-12-21 | A. Patry |
| 2 | (3388) Tsanghinchi | 1981-12-21 | Purple Mountain Observatory |
| 3 | (4504) Jenkinson | 1989-12-21 | R. H. McNaught |
| 4 | (5329) Decaro | 1989-12-21 | R. H. McNaught |
| 5 | (7205) Sadanori | 1995-12-21 | T. Kobayashi |
| 6 | (7844) Horikawa | 1995-12-21 | T. Kobayashi |
| 7 | (8912) Ohshimatake | 1995-12-21 | T. Kobayashi |
| 8 | (9791) Kamiyakurai | 1995-12-21 | T. Kobayashi |
| 9 | (11612) Obu | 1995-12-21 | A. Nakamura |
| 10 | (26169) Ishikawakiyoshi | 1995-12-21 | T. Kobayashi |
| 11 | (10412) Tsukuyomi | 1997-12-21 | Shimizu, Y., Urata, T. |
| 12 | (11150) Bragg | 1997-12-21 | F. B. Zoltowski |
| 13 | (16852) Nuredduna | 1997-12-21 | Lopez, A., Pacheco, R. |
| 14 | (16853) Masafumi | 1997-12-21 | N. Sato |
| 15 | (31179) Gongju | 1997-12-21 | N. Sato |
| 16 | (58664) IYAMMIX | 1997-12-21 | Ticha, J., Tichy, M. |
| 17 | (49440) Kenzotange | 1998-12-21 | A. Nakamura |
| 18 | (49448) Macocha | 1998-12-21 | P. Pravec |
| 19 | (72059) Heojun | 2000-12-21 | Jeon, Y.-B., Lee, B.-C. |
| 20 | (149573) Mamorudoi | 2003-12-21 | Sloan Digital Sky Survey |
| 21 | (547779) Pogo | 2006-12-21 | M. W. Buie L. H. Wasserman |
| 22 | (305263) Krasznahorkai | 2007-12-21 | K. Sarneczky |
| 23 | (305264) Tarrbela | 2007-12-21 | K. Sarneczky |
| 24 | (210433) Ullithiele | 2008-12-21 | F. Hormuth |
| 25 | (233893) Honthyhanna | 2008-12-21 | K. Sarneczky |
| 26 | (239672) SOFIA | 2008-12-21 | F. Hormuth |
| 27 | (257211) Kulizoli | 2008-12-21 | K. Sárneczky |
| 28 | (342843) Davidbowie | 2008-12-21 | F. Hormuth |
| 29 | (346666) Knorozov | 2008-12-21 | Mt. Lemmon Survey |
| 30 | (458063) Gustavomuler | 2009-12-21 | E. Schwab |
| 31 | (546842) Ruanjiangao | 2011-12-21 | Xu, Z., Gao, X. |
| 32 | (546845) Wulumuqiyizhong | 2011-12-21 | Xu, Z., Gao, X. |
| 33 | (551212) Mathieuudriot | 2012-12-21 | S. Hellmich |