Between 1990 and 1999, there were 89 Thor-based rockets launched, of which 85 were successful, giving a 95.5% success rate.
List of Thor and Delta launches |
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1957–1959 · 1960–1969 · 1970–1979 · 1980–1989 · 1990–1999 · 2000–2009 · 2010–2019 · 2020–2029 |
There were 13 Thor missiles launched in 1990. All 13 launches were successful.
Flight No. | Date / time (UTC) | Rocket, Configuration | Launch site | Payload | Payload mass | Orbit | Customer | Launch outcome |
---|---|---|---|---|---|---|---|---|
191 | January 24, 1990 22:55 | Delta II 6925 | CCAFS LC-17A | USA-50 (GPS II-6) | 840 kg | MEO | US Air Force | Success |
Navigation satellite | ||||||||
H-21 (F) | February 7, 1990 01:33 | H-I | Tanegashima SLC-N | MOS-1B (Momo-1B) / Oscar 20 / DEBUT | LEO / SSO | JAXA | Success | |
Earth observation satellite / Amateur radio satellite / Technological demonstration | ||||||||
192 | February 14, 1990 16:15 | Delta II 6920-8 | CCAFS LC-17B | LACE / RME | 2,470 kg | LEO | NASA | Success |
Military research | ||||||||
193 | March 26, 1990 02:45 | Delta II 6925 | CCAFS LC-17A | USA-54 (GPS II-7) | 840 kg | MEO | US Air Force | Success |
GPS Block II satellite | ||||||||
194 | April 13, 1990 22:28 | Delta II 6925-8 | CCAFS LC-17B | Palapa B2R | GTO | NewSat | Success | |
First commercial Delta II launch, Comsat | ||||||||
195 | June 1, 1990 21:48 | Delta II 6920-10 | CCAFS LC-17A | ROSAT | 2,421 kg | LEO | NASA | Success |
Space telescope | ||||||||
196 | June 12, 1990 05:52 | Delta 4925-8 | CCAFS LC-17B | INSAT 1D | GTO | Success | ||
Comsat, Last Delta I launch | ||||||||
197 | August 2, 1990 05:39 | Delta II 6925 | CCAFS LC-17A | USA-63 (GPS II-8) | 840 kg | MEO | US Air Force | Success |
Navigation satellite | ||||||||
198 | August 18, 1990 00:42 | Delta II 6925 | CCAFS LC-17B | Thor 1 (BSB-R2) | GTO | Success | ||
Comsat | ||||||||
H-22 (F) | August 28, 1990 09:05 | H-I | Tanegashima SLC-N | BS-3A (Yuri-3A) | GTO | Success | ||
Direct broadcasting satellite | ||||||||
199 | October 1, 1990 21:56 | Delta II 6925 | CCAFS LC-17A | USA-64 (GPS II-9) | 840 kg | MEO | US Air Force | Success |
Navigation satellite | ||||||||
200 | October 30, 1990 23:16 | Delta II 6925 | CCAFS LC-17B | Inmarsat-2 F1 | GTO | Inmarsat | Success | |
200th Delta launch, Maritime comsat | ||||||||
201 | November 26, 1990 21:39 | Delta II 7925 | CCAFS LC-17A | USA-66 (GPS IIA-1) | 1,816 kg | MEO | US Air Force | Success |
First 7000-series launch, Navigation satellite |
There were 6 Thor missiles launched in 1991. All 6 launches were successful.
Flight No. | Date / time (UTC) | Rocket, Configuration | Launch site | Payload | Payload mass | Orbit | Customer | Launch outcome |
---|---|---|---|---|---|---|---|---|
202 | January 8, 1991 00:53 | Delta II 7925 | CCAFS LC-17B | NATO 4A | 1,433 kg | GTO | NATO | Success |
Comsat | ||||||||
203 | March 8, 1991 23:03 | Delta II 6925 | CCAFS LC-17B | Inmarsat-2 F2 | GTO | Inmarsat | Success | |
Comsat | ||||||||
204 | April 13, 1991 00:09 | Delta II 7925 | CCAFS LC-17B | ASC-2 (Spacenet F4) | GTO | Success | ||
Communications satellite | ||||||||
205 | May 29, 1991 22:55 | Delta II 7925 | CCAFS LC-17B | Aurora 2 | GTO | Success | ||
Communications satellite | ||||||||
206 | July 4, 1991 02:32 | Delta II 7925 | CCAFS LC-17A | USA-71 (GPS IIA-2) | 1,816 kg | MEO | US Air Force | Success |
GPS Block IIA satellite | ||||||||
H-23 (F) | August 25, 1991 08:40 | H-I | Tanegashima SLC-N | BS-3B (Yuri-3B) | GTO | JAXA | Success | |
Direct broadcasting satellite |
There were 12 Thor missiles launched in 1992. All 12 launches were successful.
Flight No. | Date / time (UTC) | Rocket, Configuration | Launch site | Payload | Payload mass | Orbit | Customer | Launch outcome |
---|---|---|---|---|---|---|---|---|
H-24 (F) | 11 February 1992 01:50 | H-I | Tanegashima, SLC-N | JERS-1 (Fuyo) | LEO / SSO | JAXA | Success | |
Final flight of Japanese license built Deltas; final use of Extended Long Tank Thor. Earth observation satellite | ||||||||
207 | 23 February 1992 22:29 | Delta II 7925-9.5 | CCAFS, LC-17B | USA-79 (GPS IIA-3) | 840 kg | MEO | U.S. Air Force | Success |
Navigation satellite | ||||||||
208 | 10 April 1992 03:20 | Delta II 7925-9.5 | CCAFS, LC-17B | USA-80 (GPS IIA-4) | 840 kg | MEO | U.S. Air Force | Success |
Navigation satellite | ||||||||
209 | 14 May 1992 00:40 | Delta II 7925 | CCAFS, LC-17B | Palapa B4 | GTO | Indosat | Success | |
Communications satellite | ||||||||
210 | 7 June 1992 16:40 | Delta II 6920-10 | CCAFS, LC-17A | EUVE | 3,275 kg | LEO | NASA | Success |
Space telescope | ||||||||
211 | 7 July 1992 09:20 | Delta II 7925-9.5 | CCAFS, LC-17B | USA-83 (GPS IIA-5) | 840 kg | MEO | U.S. Air Force | Success |
Navigation satellite | ||||||||
212 | 24 July 1992 14:26 | Delta II 6925 | CCAFS, LC-17A | GEOTAIL | 980 kg | HEO | NASA | Success |
Final 6000-series launch, Earth observation satellite | ||||||||
213 | 31 August 1992 10:41 | Delta II 7925 | CCAFS, LC-17B | Satcom C4 | GTO | Success | ||
Communications satellite | ||||||||
214 | 9 September 1992 08:57 | Delta II 7925-9.5 | CCAFS, LC-17A | USA-84 (GPS IIA-6) | 840 kg | MEO | U.S. Air Force | Success |
Navigation satellite | ||||||||
215 | 12 October 1992 09:47 | Delta II 7925 | CCAFS, LC-17B | DFS Kopernikus-3 | 850 kg | GTO | Deutsche Bundespost | Success |
Communications satellite | ||||||||
216 | 22 November 1992 23:54 | Delta II 7925-9.5 | CCAFS, LC-17A | USA-85 (GPS IIA-7) | 840 kg | MEO | U.S. Air Force | Success |
Navigation satellite | ||||||||
217 | 18 December 1992 22:16 | Delta II 7925-9.5 | CCAFS, LC-17B | USA-87 (GPS IIA-8) | 840 kg | MEO | U.S. Air Force | Success |
Navigation satellite |
There were 7 Thor missiles launched in 1993. All 7 launches were successful.
Flight No. | Date / time (UTC) | Rocket, Configuration | Launch site | Payload | Payload mass | Orbit | Customer | Launch outcome |
---|---|---|---|---|---|---|---|---|
218 | February 3, 1993 02:55 | Delta II 7925 | CCAFS LC-17A | USA-88 (GPS IIA-9) | 1,816 kg | MEO | US Air Force | Success |
Navigation satellite | ||||||||
219 | March 30, 1993 03:09 | Delta II 7925 | CCAFS LC-17A | USA-90 (GPS IIA-10)/SEDS-1 | 1,816 kg | MEO/LEO | US Air Force | Success |
Navigation satellite/Tether demonstration | ||||||||
220 | May 13, 1993 00:07 | Delta II 7925 | CCAFS LC-17A | USA-91 (GPS IIA-11) | 1,816 kg | MEO | US Air Force | Success |
Navigation satellite | ||||||||
221 | June 26, 1993 13:27 | Delta II 7925 | CCAFS LC-17A | USA-92 (GPS IIA-12)/PMG | 1,816 kg | MEO/LEO | US Air Force | Success |
Navigation satellite/Technology demonstration | ||||||||
222 | August 30, 1993 12:38 | Delta II 7925 | CCAFS LC-17B | USA-94 (GPS IIA-13) | 1,816 kg | MEO | US Air Force | Success |
Navigation satellite | ||||||||
223 | October 26, 1993 17:04 | Delta II 7925 | CCAFS LC-17B | USA-96 (GPS IIA-14) | 1,816 kg | MEO | US Air Force | Success |
Navigation satellite | ||||||||
224 | December 8, 1993 00:48 | Delta II 7925 | CCAFS LC-17A | NATO 4B | GTO | NATO | Success | |
Communications satellite |
There were 3 Thor missiles launched in 1994. All 3 launches were successful.
Flight No. | Date / time (UTC) | Rocket, Configuration | Launch site | Payload | Payload mass | Orbit | Customer | Launch outcome |
---|---|---|---|---|---|---|---|---|
225 | February 19, 1994 23:45 | Delta II 7925-8 | CCAFS LC-17B | Galaxy 1R | GTO | Intelsat | Success | |
Communications satellite | ||||||||
226 | March 10, 1994 03:40 | Delta II 7925 | CCAFS LC-17A | USA-100 (GPS IIA-15)/SEDS-2 | 1,816 kg | MEO/LEO | US Air Force | Success |
Navigation satellite/Tether demonstration | ||||||||
227 | November 1, 1994 09:31 | Delta II 7925-10 | CCAFS LC-17B | Wind | 1,195 kg | Heliocentric | NASA | Success |
Solar research |
There were 3 Thor missiles launched in 1995. 2 of the 3 launches were successful, giving a 66.7% success rate.
Flight No. | Date / time (UTC) | Rocket, Configuration | Launch site | Payload | Payload mass | Orbit | Customer | Launch outcome |
---|---|---|---|---|---|---|---|---|
228 | 5 August 1995 11:10 | Delta II 7925–9.5 | CCAFS, LC-17B | Koreasat 1 | 711 kg | GTO | KT Corporation | Partial failure |
Communications satellite, One SRB failed to separate, retarding the booster's orbital velocity. Spacecraft eventually reached correct orbit but with substantially shortened operational life. | ||||||||
229 | 4 November 1995 14:22 | Delta II 7920-10 | VAFB, SLC-2W | RADARSAT-1 and SURFSAT | 2,750 kg | Geocentric | CSA | Success |
Earth observation satellite, first Delta II launch from Vandenberg. | ||||||||
230 | 30 December 1995 13:48:00 | Delta II 7920-10 | CCAFS, LC-17A | Rossi X-ray Timing Explorer | 3,200 kg | Low Earth orbit | NASA | Success |
Explorer program |
There were 10 Thor missiles launched in 1996. All 10 launches were successful.
Flight No. | Date / time (UTC) | Rocket, Configuration | Launch site | Payload | Payload mass | Orbit | Customer | Launch outcome |
---|---|---|---|---|---|---|---|---|
231 | January 14, 1996 11:10 | Delta II 7925 | CCAFS LC-17B | Koreasat-2 | Success | |||
232 | February 17, 1996 20:43 | Delta II 7925-8 | CCAFS LC-17B | NEAR | 487 kg | Heliocentric | NASA | Success |
Asteroid orbiter | ||||||||
233 | February 24, 1996 11:24 | Delta II 7925-10 | VAFB SLC-2W | Polar | 1,300 kg | Geocentric | NASA | Success |
Earth observation satellite | ||||||||
234 | March 28, 1996 00:21 | Delta II 7925 | CCAFS LC-17B | USA-117 (GPS IIA-16) | 1,816 kg | MEO | US Air Force | Success |
Navigation satellite | ||||||||
235 | April 24, 1996 12:27 | Delta II 7920-10 | VAFB SLC-2W | MSX | 2,700 kg | Geocentric | BMDO | Success |
Infra-red telescope | ||||||||
236 | May 24, 1996 01:10 | Delta II 7925 | CCAFS LC-17B | Galaxy 9 | 700 kg | GSO | PanAmSat / Intelsat | Success |
Communications satellite | ||||||||
237 | July 16, 1996 00:50 | Delta II 7925 | CCAFS LC-17A | USA-126 (GPS IIA-17) | 1,816 kg | MEO | US Air Force | Success |
Navigation satellite | ||||||||
238 | September 12, 1996 08:49 | Delta II 7925 | CCAFS LC-17A | USA-128 (GPS IIA-18) | 1,816 kg | MEO | US Air Force | Success |
Navigation satellite | ||||||||
239 | November 7, 1996 17:00 | Delta II 7925 | CCAFS LC-17A | Mars Global Surveyor | 1,030.5 kg | Heliocentric | NASA | Success |
Mars orbiter | ||||||||
240 | December 4, 1996 06:58 | Delta II 7925 | CCAFS LC-17B | Mars Pathfinder | 264 kg | Heliocentric | NASA | Success |
Mars lander and rover |
There were 11 Thor missiles launched in 1997. 10 of the 11 launches were successful, giving a 90.9% success rate.
Flight No. | Date / time (UTC) | Rocket, Configuration | Launch site | Payload | Payload mass | Orbit | Customer | Launch outcome |
---|---|---|---|---|---|---|---|---|
241 | January 17, 1997 16:28 | Delta II 7925-9.5 | CCAFS LC-17A | GPS IIR-1 | 2,030 kg | Planned: MEO | US Air Force | Failure |
Exploded 13 seconds after launch due to SRB failure. [1] Navigation satellite | ||||||||
242 | May 5, 1997 14:55 | Delta II 7920-10C | VAFB SLC-2 | MS-1 | LEO | Iridium | Success | |
Five Iridium satellites | ||||||||
243 | May 20, 1997 22:39 | Delta II 7925-9.5 | CCAFS LC-17A | Telenor Thor II | 1,467 kg | GTO | Telenor | Success |
Hughes HS 376 satellite | ||||||||
244 | July 9, 1997 13:04 | Delta II 7920-10C | VAFB SLC-2W | MS-2 | LEO | Iridium | Success | |
Five Iridium satellites | ||||||||
245 | July 23, 1997 03:43 | Delta II 7925-9.5 | CCAFS LC-17A | USA-132 (GPS IIR-2) | 2,032 kg | MEO | US Air Force | Success |
Navigation satellite | ||||||||
246 | August 21, 1997 00:38 | Delta II 7920-10C | VAFB SLC-2W | MS-3 | LEO | Iridium | Success | |
Five Iridium satellites | ||||||||
247 | August 25, 1997 14:39 | Delta II 7920-8 | CCAFS LC-17A | Advanced Composition Explorer (ACE) | 562 kg | Heliocentric | NASA | Success |
Solar wind and cosmic-ray research | ||||||||
248 | September 27, 1997 01:23 | Delta II 7920-10C | VAFB SLC-2W | MS-4 | LEO | Iridium | Success | |
Five Iridium satellites | ||||||||
249 | November 6, 1997 00:30 | Delta II 7925 | CCAFS LC-17A | USA-134 (GPS IIA-19) | 2,032 kg | MEO | US Air Force | Success |
Navigation satellite | ||||||||
250 | November 9, 1997 01:34 | Delta II 7920-10C | VAFB SLC-2W | MS-5 | LEO | Iridium | Success | |
Five Iridium satellites | ||||||||
251 | December 20, 1997 13:16 | Delta II 7920-10C | VAFB SLC-2W | MS-6 | LEO | Iridium | Success | |
Five Iridium satellites |
There were 13 Thor missiles launched in 1998. 12 of the 13 launches were successful, giving a 92.3% success rate.
Flight No. | Date / time (UTC) | Rocket, Configuration | Launch site | Payload | Payload mass | Orbit | Customer | Launch outcome |
---|---|---|---|---|---|---|---|---|
252 | January 10, 1998 00:32 | Delta II 7925-9.5 | CCAFS SLC-17B | Skynet 4D | Astrium Services | Success | ||
253 | February 14, 1998 14:34 | Delta II 7420-10C | CCAFS SLC-17A | Globalstar-1 | 550 kg | LEO | Globalstar | Success |
Four SS/L satellites | ||||||||
254 | February 18, 1998 13:58 | Delta II 7920-10C | VAFB SLC-2W | MS-7 | LEO | Iridium | Success | |
Five Iridium satellites | ||||||||
255 | March 30, 1998 06:02 | Delta II 7920-10C | VAFB SLC-2W | MS-8 | LEO | Iridium | Success | |
Five Iridium satellites | ||||||||
256 | April 24, 1998 22:38 | Delta II 7420-10C | CCAFS SLC-17A | Globalstar-2 | 550 kg | LEO | Globalstar | Success |
Four SS/L satellites | ||||||||
257 | May 17, 1998 21:16 | Delta II 7920-10C | VAFB SLC-2W | MS-9 | LEO | Iridium | Success | |
Five Iridium satellites | ||||||||
258 | June 10, 1998 00:35 | Delta II 7925-9.5 | CCAFS SLC-17A | Thor III | GEO | Telenor | Success | |
259 | August 27, 1998 01:17 | Delta III 8930 | CCAFS SLC-17B | Galaxy 10 | 700 kg | GTO | PanAmSat / Intelsat | Failure |
Maiden flight of Delta III, Destroyed by range safety after control problems and depletion of hydraulic fluid, Communications satellite | ||||||||
260 | September 8, 1998 21:13 | Delta II 7920-10C | VAFB SLC-2W | MS-10 | LEO | Iridium | Success | |
Five Iridium satellites | ||||||||
261 | October 24, 1998 12:08 | Delta II 7326 | CCAFS SLC-17A | Deep Space 1 | 373 kg | Heliocentric | NASA | Success |
Satellite Technology | ||||||||
262 | November 6, 1998 13:37 | Delta II 7920-10C | VAFB SLC-2W | MS-11 | LEO | Iridium | Success | |
Five Iridium satellites | ||||||||
263 | November 22, 1998 23:54 | Delta II 7925-9.5 | CCAFS SLC-17B | BONUM-1 | Success | |||
264 | December 11, 1998 18:45 | Delta II 7425 | CCAFS SLC-17A | Mars Climate Orbiter | 338 kg | Heliocentric | NASA | Success |
Payload later failed, Mars orbiter |
There were 11 Thor missiles launched in 1999. 10 of the 11 launches were successful, giving a 90.9% success rate.
Flight No. | Date / time (UTC) | Rocket, Configuration | Launch site | Payload | Payload mass | Orbit | Customer | Launch outcome |
---|---|---|---|---|---|---|---|---|
265 | January 3, 1999 20:21 | Delta II 7425 | CCAFS SLC-17B | Mars Polar Lander | 290 kg | Heliocentric | NASA | Success |
Payload later failed, Mars lander | ||||||||
266 | February 7, 1999 21:04 | Delta II 7426 | CCAFS SLC-17A | Stardust | 305.397 kg | Heliocentric | NASA | Success |
Comet probe | ||||||||
267 | February 23, 1999 10:29 | Delta II 7920-10 | VAFB SLC-2W | ARGOS (P91-1 ARGOS), Ørsted and SUNSAT | 2,450 kg | Polar orbit | AFRL / NRL / STP | Success |
At a mission cost of $220M, ARGOS, with its nine payloads, was the USAF's largest R&D mission. Both Ørsted and SUNSAT were their respective countries first satellites. Research and development, scientific | ||||||||
268 | April 15, 1999 18:32 | Delta II 7920-10 | VAFB SLC-2W | Landsat 7 | 2,200 kg | SSO | NASA | Success |
269 | May 5, 1999 01:00 | Delta III 8930 | CCAFS SLC-17B | Orion 3 | 4,300 kg | GTO | Loral | Failure |
Second stage engine failure. Payload placed into LEO, Communications satellite | ||||||||
270 | June 10, 1999 13:48 | Delta II 7420-10C | CCAFS SLC-17B | Globalstar 3 | 550 kg | LEO | Globalstar | Success |
271 | June 24, 1999 15:44 | Delta II 7320-10 | CCAFS SLC-17A | FUSE | 1,360 kg | LEO | NASA | Success |
Space telescope | ||||||||
272 | July 10, 1999 08:45 | Delta II 7420-10C | CCAFS SLC-17B | Globalstar 4 | 550 kg | LEO | Globalstar | Success |
273 | July 25, 1999 07:46 | Delta II 7420-10C | CCAFS SLC-17A | Globalstar 5 | 550 kg | LEO | Globalstar | Success |
274 | August 17, 1999 04:37 | Delta II 7420-10C | CCAFS SLC-17B | Globalstar 6 | 550 kg | LEO | Globalstar | Success |
275 | October 7, 1999 12:51 | Delta II 7925-9.5 | CCAFS SLC-17A | USA-145 (GPS IIR-3) | 2,032 kg | MEO | US Air Force | Success |
Navigation satellite |
Cape Canaveral Space Force Station (CCSFS) is an installation of the United States Space Force's Space Launch Delta 45, located on Cape Canaveral in Brevard County, Florida.
Delta II was an expendable launch system, originally designed and built by McDonnell Douglas. Delta II was part of the Delta rocket family and entered service in 1989. Delta II vehicles included the Delta 6000, and the two later Delta 7000 variants. The rocket flew its final mission ICESat-2 on 15 September 2018, earning the launch vehicle a streak of 100 successful missions in a row, with the last failure being GPS IIR-1 in 1997.
Delta is an American versatile family of expendable launch systems that has provided space launch capability in the United States since 1960. Japan also launched license-built derivatives from 1975 to 1992. More than 300 Delta rockets have been launched with a 95% success rate. Only the Delta IV Heavy rocket remains in use as of November 2020. Delta rockets have stopped being manufactured in favor of Vulcan.
The Thor-Able was an American expendable launch system and sounding rocket used for a series of re-entry vehicle tests and satellite launches between 1958 and 1960. It was a two-stage rocket, consisting of a Thor IRBM as a first stage and a Vanguard-derived Able second stage. On some flights, an Altair solid rocket motor was added as a third stage. It was a member of the Thor family and an early predecessor of the Delta.
Space Launch Complex 3 (SLC-3) is a launch site at Vandenberg Space Force Base that consists of two separate launch pads. SLC-3E (East) is currently used by the Atlas V launch vehicle, while SLC-3W (West) has been demolished.
The Minotaur is a family of United States solid fuel launch vehicles derived from converted Minuteman and Peacekeeper intercontinental ballistic missiles (ICBM). They are built by Northrop Grumman via contract with the Air Force Space and Missile Systems Center's Space Development and Test Directorate (SMC/SD) as part of the Air Force's Rocket Systems Launch Program which converts retired Intercontinental Ballistic Missiles into space and test launch systems for U.S. government agencies.
Space Launch Complex 37 (SLC-37), previously Launch Complex 37 (LC-37), is a launch complex on Cape Canaveral Space Force Station, Florida. Construction began in 1959 and the site was accepted by NASA to support the Saturn I program in 1963. The complex consists of two launch pads. LC-37A has never been used, but LC-37B launched uncrewed Saturn I flights and was modified and launched Saturn IB flights, including the first (uncrewed) test of the Apollo Lunar Module in space. It was deactivated in 1972. In 2001 it was modified as the launch site for Delta IV, a launch system operated by United Launch Alliance.
Space Launch Complex 17 (SLC-17), previously designated Launch Complex 17 (LC-17), was a launch site at Cape Canaveral Air Force Station (CCAFS), Florida used for Thor and Delta launch vehicles launches between 1958 and 2011.
ASSET, or Aerothermodynamic Elastic Structural Systems Environmental Tests was an experimental US space project involving the testing of an uncrewed sub-scale reentry vehicle.
Space Launch Complex 2 (SLC-2) is an active rocket launch site at Vandenberg Space Force Base, in California, USA. It consists of two launch pads. The East pad was used for Delta, Thor-Agena and Thorad launches between 1966 and 1972 and has been demolished. The West pad was used for Delta, Thor-Agena and Delta II launches from 1966 until 2018, when the Delta II performed its last flight.
The Thor-Ablestar, or Thor-Able-Star, also known as Thor-Epsilon was an early American expendable launch system consisting of a PGM-17 Thor missile, with an Ablestar upper stage. It was a member of the Thor family of rockets, and was derived from the Thor-Able.
The Delta A, or Thor-Delta A was an American expendable launch system used to launch two Explorer spacecraft in October 1962. A derivative of the Thor-Delta, it was a member of the Delta family of launch vehicles. The Thor-Delta itself was a Thor booster with an Able second stage and Altair third stage.