Asteroids discovered on September 21
113 named asteroids.
| # | Asteroid | Discovered | Discoverer |
|---|---|---|---|
| 1 | (149) Medusa | 1875-09-21 | J. Perrotin |
| 2 | (269) Justitia | 1887-09-21 | J. Palisa |
| 3 | (458) Hercynia | 1900-09-21 | Wolf, M. F., Schwassmann, A. |
| 4 | (478) Tergeste | 1901-09-21 | L. Carnera |
| 5 | (671) Carnegia | 1908-09-21 | J. Palisa |
| 6 | (672) Astarte | 1908-09-21 | A. Kopff |
| 7 | (693) Zerbinetta | 1909-09-21 | A. Kopff |
| 8 | (1123) Shapleya | 1928-09-21 | G. N. Neujmin |
| 9 | (1475) Yalta | 1935-09-21 | P. F. Shajn |
| 10 | (5533) Bagrov | 1935-09-21 | P. F. Shajn |
| 11 | (1495) Helsinki | 1938-09-21 | Y. Vaisala |
| 12 | (1928) Summa | 1938-09-21 | Y. Vaisala |
| 13 | (1543) Bourgeois | 1941-09-21 | E. Delporte |
| 14 | (2231) Durrell | 1941-09-21 | S. J. Arend |
| 15 | (2379) Heiskanen | 1941-09-21 | Y. Vaisala |
| 16 | (2454) Olaus Magnus | 1941-09-21 | Y. Vaisala |
| 17 | (3522) Becker | 1941-09-21 | Y. Vaisala |
| 18 | (2035) Stearns | 1973-09-21 | J. Gibson |
| 19 | (3438) Inarradas | 1974-09-21 | Felix Aguilar Observatory |
| 20 | (5839) GOI | 1974-09-21 | N. S. Chernykh |
| 21 | (3984) Chacos | 1984-09-21 | H. Debehogne |
| 22 | (5368) Vitagliano | 1984-09-21 | H. Debehogne |
| 23 | (10485) Sarahyeomans | 1984-09-21 | H. Debehogne |
| 24 | (11832) Pustylnik | 1984-09-21 | H. Debehogne |
| 25 | (4040) Purcell | 1987-09-21 | E. Bowell |
| 26 | (4177) Kohman | 1987-09-21 | E. Bowell |
| 27 | (5677) Aberdonia | 1987-09-21 | E. Bowell |
| 28 | (5771) Somerville | 1987-09-21 | E. Bowell |
| 29 | (6122) Henrard | 1987-09-21 | E. Bowell |
| 30 | (6182) Katygord | 1987-09-21 | E. Bowell |
| 31 | (6474) Choate | 1987-09-21 | E. Bowell |
| 32 | (6512) de Bergh | 1987-09-21 | E. Bowell |
| 33 | (6698) Malhotra | 1987-09-21 | E. Bowell |
| 34 | (7011) Worley | 1987-09-21 | E. Bowell |
| 35 | (9308) Randyrose | 1987-09-21 | E. Bowell |
| 36 | (9563) Kitty | 1987-09-21 | E. Bowell |
| 37 | (11846) Verminnen | 1987-09-21 | E. W. Elst |
| 38 | (14833) Vilenius | 1987-09-21 | E. Bowell |
| 39 | (15703) Yrjola | 1987-09-21 | E. Bowell |
| 40 | (5835) Mainfranken | 1992-09-21 | F. Borngen |
| 41 | (5975) Otakemayumi | 1992-09-21 | Endate, K., Watanabe, K. |
| 42 | (8381) Hauptmann | 1992-09-21 | F. Borngen |
| 43 | (10116) Robertfranz | 1992-09-21 | Borngen, F., Schmadel, L. D. |
| 44 | (12326) Shirasaki | 1992-09-21 | Endate, K., Watanabe, K. |
| 45 | (12327) Terbruggen | 1992-09-21 | Schmadel, L. D., Borngen, F. |
| 46 | (13093) Wolfgangpauli | 1992-09-21 | F. Borngen |
| 47 | (14441) Atakanoseki | 1992-09-21 | Yanai, M., Watanabe, K. |
| 48 | (14901) Hidatakayama | 1992-09-21 | Yanai, M., Watanabe, K. |
| 49 | (15301) Marutesser | 1992-09-21 | Schmadel, L. D., Borngen, F. |
| 50 | (15762) Ruhmann | 1992-09-21 | F. Borngen |
| 51 | (16587) Nagamori | 1992-09-21 | Endate, K., Watanabe, K. |
| 52 | (16590) Brunowalter | 1992-09-21 | Borngen, F., Schmadel, L. D. |
| 53 | (18395) Schmiedmayer | 1992-09-21 | Schmadel, L. D., Borngen, F. |
| 54 | (18396) Nellysachs | 1992-09-21 | Borngen, F., Schmadel, L. D. |
| 55 | (24751) Kroemer | 1992-09-21 | F. Borngen |
| 56 | (30882) Tomhenning | 1992-09-21 | Schmadel, L. D., Borngen, F. |
| 57 | (32853) Dobereiner | 1992-09-21 | Borngen, F., Schmadel, L. D. |
| 58 | (39571) Puckler | 1992-09-21 | F. Borngen |
| 59 | (52341) Ballmann | 1992-09-21 | Schmadel, L. D., Borngen, F. |
| 60 | (58215) von Klitzing | 1992-09-21 | Borngen, F., Schmadel, L. D. |
| 61 | (85214) Sommersdorf | 1992-09-21 | Borngen, F., Schmadel, L. D. |
| 62 | (17547) Nestebovelli | 1993-09-21 | A. Vagnozzi |
| 63 | (7605) Cindygraber | 1995-09-21 | T. B. Spahr |
| 64 | (9413) Eichendorff | 1995-09-21 | F. Borngen |
| 65 | (10865) Thelmaruby | 1995-09-21 | Spacewatch |
| 66 | (14041) Durrenmatt | 1995-09-21 | F. Borngen |
| 67 | (16714) Arndt | 1995-09-21 | F. Borngen |
| 68 | (19364) Semafor | 1997-09-21 | L. Sarounova |
| 69 | (27960) Dobias | 1997-09-21 | L. Sarounova |
| 70 | (31122) Brooktaylor | 1997-09-21 | P. G. Comba |
| 71 | (11379) Flaubert | 1998-09-21 | E. W. Elst |
| 72 | (12567) Herreweghe | 1998-09-21 | E. W. Elst |
| 73 | (14600) Gainsbourg | 1998-09-21 | E. W. Elst |
| 74 | (20418) Josephjao | 1998-09-21 | E. W. Elst |
| 75 | (22717) Romeuf | 1998-09-21 | ODAS |
| 76 | (23904) Amytang | 1998-09-21 | LINEAR |
| 77 | (23931) Ibuki | 1998-09-21 | LONEOS |
| 78 | (27052) Katebush | 1998-09-21 | ODAS |
| 79 | (40201) Besely | 1998-09-21 | ODAS |
| 80 | (42747) Fuser | 1998-09-21 | V. Goretti |
| 81 | (42748) Andrisani | 1998-09-21 | V. Goretti |
| 82 | (13405) Dorisbillings | 1999-09-21 | G. W. Billings |
| 83 | (21785) Mechain | 1999-09-21 | M. Tichy |
| 84 | (70409) Srnin | 1999-09-21 | M. Tichy |
| 85 | (385205) Michelvancamp | 1999-09-21 | T. Pauwels |
| 86 | (34544) Omarsanreyes | 2000-09-21 | LINEAR |
| 87 | (34545) Chirita | 2000-09-21 | LINEAR |
| 88 | (36983) Sumner | 2000-09-21 | M. W. Buie |
| 89 | (87933) Bernardschmitt | 2000-09-21 | M. W. Buie |
| 90 | (34817) Shiominemoto | 2001-09-21 | BATTeRS |
| 91 | (34837) Berilsaygin | 2001-09-21 | LINEAR |
| 92 | (34838) Lazowski | 2001-09-21 | W. K. Y. Yeung |
| 93 | (55331) Putzi | 2001-09-21 | Juels, C. W., Holvorcem, P. R. |
| 94 | (169299) Sirko | 2001-09-21 | Sloan Digital Sky Survey |
| 95 | (524638) Kaffkamargit | 2003-09-21 | B. SipÅcz K. Sárneczky |
| 96 | (224206) Pietchisson | 2005-09-21 | M. Ory |
| 97 | (261107) Cameroncasimir | 2005-09-21 | A. C. Becker |
| 98 | (368704) Roelgathier | 2005-09-21 | T. Pauwels |
| 99 | (210147) Zalgiris | 2006-09-21 | Cernis, K., Zdanavicius, J. |
| 100 | (299777) Tanyastreeter | 2006-09-21 | V. S. Casulli |
| 101 | (207754) Stathiskafalis | 2007-09-21 | W. Ries |
| 102 | (241192) Pulyny | 2007-09-21 | Andrushivka |
| 103 | (335968) Xiejin | 2007-09-21 | PMO NEO Survey Program |
| 104 | (345959) Dafeng | 2007-09-21 | PMO NEO Survey Program |
| 105 | (588255) Hantang | 2007-09-21 | PMO NEO Survey Program |
| 106 | (599587) Shangjiaouni | 2007-09-21 | PMO NEO Survey Program |
| 107 | (703756) Xijiaouni | 2007-09-21 | PMO NEO Survey Program |
| 108 | (228147) Miquelbarcelo | 2009-09-21 | OAM |
| 109 | (332733) Drolshagen | 2009-09-21 | OAM |
| 110 | (541631) Kirbulychev | 2011-09-21 | Kryachko, T., Satovski, B. |
| 111 | (545839) Hernanletelier | 2011-09-21 | Kryachko, T., Satovski, B. |
| 112 | (549706) Spbuni | 2011-09-21 | Kryachko, T., Satovski, B. |
| 113 | (576466) Scherpenisse | 2012-09-21 | M. Langbroek |