Thor DM-21 Agena-B or just Thor-Agena was a series of orbital launch vehicles. The rockets used the Douglas-built Thor first stage and the Lockheed-built Agena second stages. They are thus cousins of the more-famous Thor-Deltas, which founded the Delta rocket family. The first attempted launch of a Thor DM-21 Agena-B was in January 1959. The first successful launch was on 28 February 1959, launching Discoverer 17.^[1]

The data in this table comes from^[2]

Date/Time (UTC)	Rocket	S/N	Launch Site	Payload	Function	Orbit	Outcome	Remarks
1960-10-26 20:26	Thor DM-21 Agena-B	Thor 253 Agena 1061	VAFB LC-75-3-4	Discoverer 16	Reconnaissance	LEO	Failure	Maiden flight of Thor-Agena B. Agena staging failed. Vehicle fell into the Pacific Ocean.
1960-11-12 20:43	Thor DM-21 Agena-B	Thor 297 Agena 1062	VAFB LC-75-3-5	Discoverer 17	Reconnaissance	LEO	Success
1960-12-07 20:20:58	Thor DM-21 Agena-B	Thor 296 Agena 1103	VAFB LC-75-3-4	Discoverer 18	Reconnaissance	LEO	Success
1960-12-20 20:32	Thor DM-21 Agena-B	Thor 258 Agena 1101	VAFB LC-75-3-5	Discoverer 19	Technology	LEO	Success
1961-02-17 20:25	Thor DM-21 Agena-B	Thor 298	VAFB LC-75-3-4	Discoverer 20	Reconnaissance	LEO	Success
1961-02-18 22:58	Thor DM-21 Agena-B	Thor 261 Agena 1102	VAFB LC-75-3-5	Discoverer 21	Technology	LEO	Success
1961-03-30 20:34:43	Thor DM-21 Agena-B	Thor 300 Agena 1105	VAFB LC-75-3-4	Discoverer 22	Reconnaissance	LEO	Failure	Agena control failure.
1961-04-08 19:21	Thor DM-21 Agena-B	Thor 307 Agena 1106	VAFB LC-75-3-5	Discoverer 23	Reconnaissance	LEO	Success
1961-06-08 21:16	Thor DM-21 Agena-B	Thor 302 Agena 1108	VAFB LC-75-3-4	Discoverer 24	Reconnaissance	LEO	Failure	Agena power failure
1961-06-16 23:02	Thor DM-21 Agena-B	Thor 303 Agena 1107	VAFB LC-75-1-1	Discoverer 25	Reconnaissance	LEO	Success
1961-07-07 23:29:48	Thor DM-21 Agena-B	Thor 308 Agena 1109	VAFB LC-75-3-5	Discoverer 26	Reconnaissance	LEO	Success
1961-07-21 22:35	Thor DM-21 Agena-B	Thor 322 Agena 1110	VAFB LC-75-3-4	Discoverer 27	Reconnaissance	LEO	Failure	Open circuit in guidance computer led to loss of control and vehicle breakup at T+60 seconds.
1961-08-04 00:01	Thor DM-21 Agena-B	Thor 309 Agena 1111	VAFB LC-75-1-1	Discoverer 28	Reconnaissance	LEO	Failure	Agena control system malfunctioned
1961-08-30 20:00	Thor DM-21 Agena-B	Thor 323 Agena 1112	VAFB LC-75-3-4	Discoverer 29	Reconnaissance	LEO	Success
1961-09-12 19:59	Thor DM-21 Agena-B	Thor 310 Agena 1113	VAFB LC-75-3-5	Discoverer 30	Reconnaissance	LEO	Success
1961-09-17 21:00	Thor DM-21 Agena-B	Thor 324 Agena 1114	VAFB LC-75-1-1	Discoverer 31	Reconnaissance	LEO	Success
1961-10-13 19:22	Thor DM-21 Agena-B	Thor 328 Agena 1115	VAFB LC-75-3-4	Discoverer 32	Reconnaissance	LEO	Success	100th Thor launch
1961-10-23 19:23	Thor DM-21 Agena-B	Thor 329 Agena 1116	VAFB LC-75-3-5	Discoverer 33	Reconnaissance	LEO	Failure	Agena hydraulics failure
1961-11-05 20:00	Thor DM-21 Agena-B	Thor 330 Agena 1117	VAFB LC-75-1-1	Discoverer 34	Reconnaissance	LEO	Failure	Incorrect guidance program left the satellite in a useless orbit.
1961-11-15 21:23	Thor DM-21 Agena-B	Thor 326 Agena 1118	VAFB LC-75-3-4	Discoverer 35	Reconnaissance	LEO	Success
1961-12-12 20:40	Thor DM-21 Agena-B	Thor 325 Agena 1119	VAFB LC-75-3-4	Discoverer 36 Oscar 1	Reconnaissance Amateur radio satellite	LEO	Success
1962-01-13 21:41	Thor DM-21 Agena-B	Thor 327 Agena 1120	VAFB LC-75-3-4	Discoverer 37	Reconnaissance	LEO	Failure	Agena restart burn failed.
1962-02-21 18:44	Thor DM-21 Agena-B	Thor 332 Agena 2301	VAFB LC-75-3-5	FTV 2301	ELINT	LEO	Partial failure	Upper stage failed to restart for circularization burn
1962-02-27 19:39	Thor DM-21 Agena-B	Thor 241 Agena 1123	VAFB LC-75-3-4	Discoverer 38	Reconnaissance	LEO	Success
1962-04-18 00:54	Thor DM-21 Agena-B	Thor 331 Agena 1124	VAFB LC-75-3-5	Discoverer 39	Reconnaissance	LEO	Success
1962-04-29 00:30:12	Thor DM-21 Agena-B	Thor 333 Agena 1125	VAFB LC-75-3-4	FTV 1125	Reconnaissance	LEO	Success
1962-05-15 19:36	Thor DM-21 Agena-B	Thor 334 Agena 1126	VAFB LC-75-3-5	FTV 1126	Reconnaissance	LEO	Success
1962-05-30 01:00:04	Thor DM-21 Agena-B	Thor 336 Agena 1128	VAFB LC-75-1-1	FTV 1128	Reconnaissance	LEO	Success
1962-06-02 00:31	Thor DM-21 Agena-B	Thor 335 Agena 1127	VAFB LC-75-3-4	FTV 1127 Oscar 2	Reconnaissance Amateur radio	LEO	Success
1962-06-18 20:20	Thor DM-21 Agena-B	Thor 343 Agena 2312	VAFB LC-75-3-5	FTV 2312	ELINT	LEO	Success
1962-06-23 00:30	Thor DM-21 Agena-B	Thor 339 Agena 1129	VAFB LC-75-3-4	FTV 1129	Reconnaissance	LEO	Success
1962-07-21 00:56	Thor DM-21 Agena-B	Thor 342 Agena 1130	VAFB LC-75-3-5	FTV 1130	Reconnaissance	LEO	Success
1962-07-28 00:30	Thor DM-21 Agena-B	Thor 347 Agena 1131	VAFB LC-75-3-4	FTV 1131	Reconnaissance	LEO	Success
1962-09-01 20:39	Thor DM-21 Agena-B	Thor 348 Agena 1132	VAFB LC-75-3-5	FTV 1132	Reconnaissance	LEO	Success
1962-09-17 23:46	Thor DM-21 Agena-B	Thor 350 Agena 1133	VAFB LC-75-3-4	FTV 1133 ERS-2	Reconnaissance Technology	LEO	Success
1962-09-29 06:05	Thor DM-21 Agena-B	Thor 341 TA-1	VAFB LC-75-1-1	Alouette 1 TAVE	Ionospheric Technology	LEO	Success
1962-10-09 18:35	Thor DM-21 Agena-B	Thor 352 Agena 1134	VAFB LC-75-3-4	FTV 1134	Reconnaissance	LEO	Success
1962-11-05 22:04	Thor DM-21 Agena-B	Thor 356 Agena 1136	VAFB LC-75-3-4	FTV 1136	Reconnaissance	LEO	Success
1962-11-24 22:01	Thor DM-21 Agena-B	Thor 367 Agena 1135	VAFB LC-75-3-4	FTV 1135	Reconnaissance	LEO	Success
1963-01-16 21:59	Thor DM-21 Agena-B	Thor 363 Agena 2313	VAFB LC-75-3-5	OPS 0180	ELINT	LEO	Success
1965-11-29 04:48	Thor DM-21 Agena-B	Thor 453 Agena 6102	VAFB LC-75-1-1	Alouette 2 / Explorer 31 (DME)	Ionospheric research satellite / Ionospheric research satellite	MEO	Success