Asteroids discovered on October 21
88 named asteroids.
| # | Asteroid | Discovered | Discoverer |
|---|---|---|---|
| 1 | (76) Freia | 1862-10-21 | H. d'Arrest |
| 2 | (208) Lacrimosa | 1879-10-21 | J. Palisa |
| 3 | (525) Adelaide | 1908-10-21 | J. H. Metcalf |
| 4 | (723) Hammonia | 1911-10-21 | J. Palisa |
| 5 | (724) Hapag | 1911-10-21 | J. Palisa |
| 6 | (725) Amanda | 1911-10-21 | J. Palisa |
| 7 | (1328) Devota | 1925-10-21 | B. Jekhovsky |
| 8 | (1374) Isora | 1935-10-21 | E. Delporte |
| 9 | (2106) Hugo | 1936-10-21 | M. Laugier |
| 10 | (1508) Kemi | 1938-10-21 | H. Alikoski |
| 11 | (5705) Ericsterken | 1965-10-21 | H. Debehogne |
| 12 | (3695) Fiala | 1973-10-21 | H. L. Giclas |
| 13 | (2550) Houssay | 1976-10-21 | Felix Aguilar Observatory |
| 14 | (4562) Poleungkuk | 1979-10-21 | Purple Mountain Observatory |
| 15 | (3061) Cook | 1982-10-21 | E. Bowell |
| 16 | (3376) Armandhammer | 1982-10-21 | L. V. Zhuravleva |
| 17 | (3469) Bulgakov | 1982-10-21 | L. G. Karachkina |
| 18 | (3507) Vilas | 1982-10-21 | E. Bowell |
| 19 | (3516) Rusheva | 1982-10-21 | L. G. Karachkina |
| 20 | (3668) Ilfpetrov | 1982-10-21 | L. G. Karachkina |
| 21 | (3669) Vertinskij | 1982-10-21 | L. G. Karachkina |
| 22 | (3772) Piaf | 1982-10-21 | L. G. Karachkina |
| 23 | (4927) O'Connell | 1982-10-21 | Z. Vavrova |
| 24 | (4928) Vermeer | 1982-10-21 | L. G. Karachkina |
| 25 | (5316) Filatov | 1982-10-21 | L. G. Karachkina |
| 26 | (6082) Timiryazev | 1982-10-21 | L. V. Zhuravleva |
| 27 | (7633) Volodymyr | 1982-10-21 | L. G. Karachkina |
| 28 | (9006) Voytkevych | 1982-10-21 | L. G. Karachkina |
| 29 | (9539) Prishvin | 1982-10-21 | L. G. Karachkina |
| 30 | (9540) Mikhalkov | 1982-10-21 | L. G. Karachkina |
| 31 | (10287) Smale | 1982-10-21 | L. G. Karachkina |
| 32 | (14818) Mindeli | 1982-10-21 | L. G. Karachkina |
| 33 | (22276) Belkin | 1982-10-21 | L. V. Zhuravleva |
| 34 | (23436) Alekfursenko | 1982-10-21 | L. V. Zhuravleva |
| 35 | (26087) Zhuravleva | 1982-10-21 | L. G. Karachkina |
| 36 | (32766) Voskresenskoe | 1982-10-21 | L. V. Zhuravleva |
| 37 | (4399) Ashizuri | 1984-10-21 | T. Seki |
| 38 | (4488) Tokitada | 1987-10-21 | Suzuki, K., Urata, T. |
| 39 | (5507) Niijima | 1987-10-21 | Suzuki, K., Urata, T. |
| 40 | (5640) Yoshino | 1989-10-21 | Mukai, M., Takeishi, M. |
| 41 | (5960) Wakkanai | 1989-10-21 | Mukai, M., Takeishi, M. |
| 42 | (12262) Nishio | 1989-10-21 | Endate, K., Watanabe, K. |
| 43 | (21033) Akahirakiyozo | 1989-10-21 | Endate, K., Watanabe, K. |
| 44 | (30805) Mikimasa | 1989-10-21 | Endate, K., Watanabe, K. |
| 45 | (5684) Kogo | 1990-10-21 | T. Urata |
| 46 | (6395) Hilliard | 1990-10-21 | Kushida, Y., Muramatsu, O. |
| 47 | (10768) Sarutahiko | 1990-10-21 | T. Urata |
| 48 | (5922) Shouichi | 1992-10-21 | S. Otomo |
| 49 | (6336) Dodo | 1992-10-21 | S. Otomo |
| 50 | (7252) Kakegawa | 1992-10-21 | T. Urata |
| 51 | (8691) Etsuko | 1992-10-21 | Kushida, Y., Muramatsu, O. |
| 52 | (10803) Caleyo | 1992-10-21 | T. Seki |
| 53 | (12745) Kazujinishimura | 1992-10-21 | Mizuno, Y., Furuta, T. |
| 54 | (15304) Wikberg | 1992-10-21 | Shoemaker, C. S., Shoemaker, E. M. |
| 55 | (20036) Marcboucher | 1992-10-21 | Mizuno, Y., Furuta, T. |
| 56 | (7492) Kacenka | 1995-10-21 | P. Pravec |
| 57 | (11604) Novigrad | 1995-10-21 | Korlevic, K., Brcic, V. |
| 58 | (19268) Morstadt | 1995-10-21 | P. Pravec |
| 59 | (15395) Rukl | 1997-10-21 | P. Pravec |
| 60 | (16809) Galapagos | 1997-10-21 | Starkenburg |
| 61 | (29473) Krejci | 1997-10-21 | Pravec, P., Sarounova, L. |
| 62 | (35364) Donaldpray | 1997-10-21 | P. Pravec |
| 63 | (35365) Cooney | 1997-10-21 | P. Pravec |
| 64 | (14617) Lasvergnas | 1998-10-21 | ODAS |
| 65 | (52982) Marieclaire | 1998-10-21 | ODAS |
| 66 | (74317) Marionbonafous | 1998-10-21 | ODAS |
| 67 | (38976) Taeve | 2000-10-21 | G. Lehmann |
| 68 | (67712) Kimotsuki | 2000-10-21 | BATTeRS |
| 69 | (140620) Raoulwallenberg | 2001-10-21 | W. K. Y. Yeung |
| 70 | (720549) Cirik | 2001-10-21 | NEAT |
| 71 | (136199) Eris | 2003-10-21 | Brown, M. E., Trujillo, C. A., Rabinowitz, D. L. |
| 72 | (164006) Thierry | 2003-10-21 | B. Christophe |
| 73 | (317917) Jodelle | 2003-10-21 | Saint-Sulpice |
| 74 | (188867) Tin Ho | 2006-10-21 | Ye, Q.-Z., Lin, H.-C. |
| 75 | (755509) Juming | 2006-10-21 | LUSS |
| 76 | (207899) Grinmalia | 2008-10-21 | Andrushivka |
| 77 | (215016) Catherinegriffin | 2008-10-21 | D. Grennan |
| 78 | (281561) Taitung | 2008-10-21 | Hsiao, X. Y., Ye, Q.-z. |
| 79 | (269485) Bisikalo | 2009-10-21 | |
| 80 | (403491) Anthonygrayling | 2009-10-21 | CSS |
| 81 | (633570) Viktorzagainov | 2009-10-21 | Kryachko, T., Satovski, B. |
| 82 | (583729) Tejfel | 2011-10-21 | Kryachko, T., Satovski, B. |
| 83 | (552681) Sosvera | 2012-10-21 | G. Hodosán K. Sárneczky |
| 84 | (560388) Normafa | 2012-10-21 | G. Hodosán K. Sárneczky |
| 85 | (578622) Fergezsuzsa | 2012-10-21 | G. Hodosán K. Sárneczky |
| 86 | (601036) Sassflora | 2012-10-21 | G. Hodosán K. Sárneczky |
| 87 | (635057) Bangailona | 2012-10-21 | G. Hodosán K. Sárneczky |
| 88 | (884759) Compostela | 2017-10-21 | I. EglÄ«tis K. Äernis |