Space
Launch Report: Delta II Data Sheet |
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Delta II
Boeing's Delta II, one of the world's most most successful expendable space launch vehicles, was an updated version of the Thor-Delta series that first flew for NASA in 1960. In the early 1980s, NASA halted procurement at Delta 183 after shifting all payloads to the Space Transportation System. To create Delta II for the U.S. Air Force Medium Launch Vehicle (MLV) program after the 1986 Challenger accident, McDonnell Douglas had to restart Delta production. The new rocket's first stage was stretched 3.66 meters and it's payload fairing was widened. The ultimate Delta II version, which did not appear until 1990, was boosted by more powerful solid rocket motors and a more powerful first stage motor. Delta 184, the first Delta II, launched GPS 14 on Valentine's Day, 1989. Boeing used a four-digit numbering system to identify
specific Delta models. The first digit indicated the first stage and solid rocket
motor (SRM) type. The first Delta II models, 16 altogether, were 6000-series birds
with Extra Long Extended Tank (XLET) Thor first stages, with a Rocketdyne RS-27A main
engine, and with Thiokol Castor 4A SRMs. Subsequent 7000-series Delta II vehicles
used more powerful Alliant Graphite Epoxy SRMs (GEMs).
The second digit told how many SRMs were used, usually 3, 4 or 9. When nine SRMs were used, six ignite on the pad. The remaining three ignited in the air after the first six burn out. The third digit indicated the type of second stage. After 1982, Delta used a Type 2 second stage powered by an Aerojet AJ10-118K pressure-fed, restartable hypergolic engine. The fourth digit identified the optional third stage type. Delta II could be configured with no third stage (Type 0), with a Star 48B (Type 5), or with a Star 37 (Type 6). These solid motors were spun up on a second-stage-mounted spin table to add stability prior to release. Delta II did not use a third stage for low earth orbit missions. In 2003, a new Delta II type, the 7XXX-H series (H for
"Heavy") debuted. Delta II Heavy used nine of the larger, more powerful GEM-46
LDXL SRMs that were originally developed for Boeing's Delta III.
Three Delta II payload fairings were available. The standard 2.9 meter diameter aluminum hammerhead payload fairing was designed to handle GPS-class payloads. A 3 meter tapered composite fairing later became the standard, replacing the aluminum fairing. Versatile Delta II flew a wide variety of missions from fixed pads at both Cape Canaveral (SLC 17A and 17B) and Vandenberg (SLC 2W). Payload capacity to low earth orbit (LEO) from the Cape ranged from 2.8 to 6.1 metric tons. Polar orbit LEO payload capacity from Vandenberg was 2.1 to 3.8 tons (more mass could be boosted if SLC 2W were modified to handle the GEM-46 SRMs). Delta II could launch 1.1 to 2.2 tons to a 28.5 degree inclination geosynchronous transfer orbit (GTO) from Canaveral, and could propel nearly as much mass to solar orbit using a third stage. Its GTO mission business dwindled after the 1990s, but Delta II continued to launch LEO satellites, NASA deep space missions, and GPS satellites for the U.S. Air Force. The GPS launches finally ended on August 17, 2009 with a final launch from SLC 17A. Seven subsequent non GPS launches from SLC 17B and from Vandenberg AFB SLC 2W closed out the planned manifest during 2009-2011. The final Cape launch, by Delta 356 (a 7920H) on September 9, 2011, sent NASA's GRAIL A and B spacecraft toward the Moon. Delta 357 (a 7920), closed out the manifest, and possibly the program, with an October 28, 2011 launch from Vandenberg carrying NPP and several additional satellites into sun synchronous orbit. It was the 151st Delta II and the 96th consecutive success. It was also the 340th Thor-Delta, the 606th orbital Thor, and the 719th Thor launch of any type. After D357, United Launch Alliance still had parts on
hand, in inventory at suppliers, or with parts able to be manufactured, to assemble five
more Delta II rockets. None had payloads assigned, but ULA was actively offering the
vehicles to NASA.
On July 16, 2012, NASA announced that it had awarded launch services contracts for three United Launch Alliance Delta 2 rockets, all to launch from California's Vandenberg Air Force Base. The announcement marked a reprieve for Delta 2, which had no manifested flights prior to the announcement. Delta 2 will launch the Soil Moisture Active Passive (SMAP) satellite during October 2014, the Orbiting Carbon Observatory-2 (OCO-2) during July 2014, and the Joint Polar Satellite System-1 (JPSS-1) spacecraft during November 2016. The total cost for the three launches, including payload processing and other mission-unique ground support, is about $412 million. The three rockets, which will fly from Space Launch Complex 2 West toward sun synchronous low earth orbits, will largely be assembled from already-manufactured stockpiled components, such as engines, tank panels, and avionics. ATK will manufacture new solid rocket motor sets for the 7x20-series rockets. Parts for two additional unassigned Delta 2 rockets remained. On February 22, 2013, NASA announced
that it had assigned a fourth Delta 2 to launch the Ice, Cloud and Land Elevation
Satellite (ICESat)-2 into near polar obit from Vandenberg AFB, a launch then scheduled for
July 2016. A firm fixed-price launch service task order was awarded for the Delta
7320-10C launch under the indefinite-delivery, indefinite-quantity NASA Launch Services
(NLS) II contract. NASA's total cost to launch ICESat-2 would be $96.6 million,
including payload processing, integrated services, telemetry, reimbursables and other
launch support requirements. The assignment gave Delta 2 a chance to record 100
consecutive success, should all four missions succeed.
*GEO: Geosynchronous
Earth Orbit
DELTA 2 ORBITAL SPACE LAUNCH LOG DATE VEHICLE ID PAYLOAD MASS(t) SITE* ORBIT* ------------------------------------------------------------------------------------- 02/14/89 Delta 2-6925 D184 GPS-2 1 (USA 35) 1.66 CC 17A MTO [1] 06/10/89 Delta 2-6925 D185 GPS-2 2 (USA 38) 1.66 CC 17A MTO 08/18/89 Delta 2-6925 D186 GPS-2 3 (USA 42) 1.66 CC 17A MTO 10/21/89 Delta 2-6925 D188 GPS-2 4 (USA 47) 1.66 CC 17A MTO 12/11/89 Delta 2-6925 D190 GPS-2 5 (USA 49) 1.66 CC 17B MTO 01/24/90 Delta 2-6925 D191 GPS-2 6 (USA 50) 1.66 CC 17A MTO 02/14/90 Delta 2-6920-8 D192 LACE / RME 2.47 CC 17B LEO [2] 03/26/90 Delta 2-6925 D193 GPS-2 7 (USA 54) 1.66 CC 17A MTO 04/13/90 Delta 2-6925-8 D194 Palapa B2R 1.2 CC 17B GTO 06/01/90 Delta 2-6920-10 D195 ROSAT 2.426 CC 17A LEO 08/02/90 Delta 2-6925 D197 GPS-2 8 (USA 63) 1.66 CC 17A MTO 08/18/90 Delta 2-6925 D198 Marco Polo 2 1.25 CC 17B GTO 10/01/90 Delta 2-6925 D199 GPS-2 9 (USA 64) 1.66 CC 17A MTO 10/30/90 Delta 2-6925 D200 Inmarsat-2 F1 1.31 CC 17B GTO 11/26/90 Delta 2-7925 D201 GPS-2A 1 (USA 66) 1.816 CC 17A MTO 01/08/91 Delta 2-7925 D202 NATO 4A 1.434 CC 17B GTO 03/08/91 Delta 2-6925 D203 Inmarsat-2 F2 1.31 CC 17B GTO 04/13/91 Delta 2-7925 D204 ASC 2 1.35 CC 17B GTO 05/29/91 Delta 2-7925 D205 Satcom C5 (Aurora 2) 1.169 CC 17B GTO 07/04/91 Delta 2-7925 D206 GPS-2A 2 / Losat X 1.816 CC 17A MTO 02/23/92 Delta 2-7925 D207 GPS-2A 3 (USA 79) 1.816 CC 17B MTO 04/10/92 Delta 2-7925 D208 GPS-2A 4 (USA 80) 1.816 CC 17B MTO 05/14/92 Delta 2-7925-8 D209 Palapa B4 1.2 CC 17B GTO 06/07/92 Delta 2-6920-10 D210 EUVE 3.275 CC 17A LEO 07/07/92 Delta 2-7925 D211 GPS-2A 5 (USA 83) 1.816 CC 17B MTO 07/24/92 Delta 2-6925 D212 Geotail / DUVE 1.009 CC 17A EEO [3] 08/31/92 Delta 2-7925 D213 Satcom C4 1.169 CC 17B GTO 09/09/92 Delta 2-7925 D214 GPS-2A 6 (USA 84) 1.816 CC 17A MTO 10/12/92 Delta 2-7925 D215 DFS-Kopernikus 3 1.415 CC 17B GTO 11/22/92 Delta 2-7925 D216 GPS-2A 7 (USA 85) 1.816 CC 17A MTO 12/18/92 Delta 2-7925 D217 GPS-2A 8 (USA 87) 1.816 CC 17B MTO 02/03/93 Delta 2-7925 D218 GPS-2A 9 (USA 88) 1.816 CC 17A MTO 03/30/93 Delta 2-7925 D219 GPS-2A 10 / SEDS 1 1.816 CC 17A MTO 05/13/93 Delta 2-7925 D220 GPS-2A 11 (USA 91) 1.816 CC 17A MTO 06/26/93 Delta 2-7925 D221 GPS-2A 12 (USA 92)/PMG 1.816 CC 17A MTO 08/30/93 Delta 2-7925 D222 GPS-2A 13 (USA 94) 1.816 CC 17B MTO 10/26/93 Delta 2-7925 D223 GPS-2A 14 (USA 96) 1.816 CC 17B MTO 12/08/93 Delta 2-7925 D224 NATO 4B (USA 98) 1.434 CC 17A GTO 02/19/94 Delta 2-7925-8 D225 Galaxy 1R2 1.397 CC 17B GTO 03/10/94 Delta 2-7925 D226 GPS-2A 15 / SEDS 2 1.816 CC 17A MTO 11/01/94 Delta 2-7925-10 D227 Wind 1.2 CC 17B EEO 08/05/95 Delta 2-7925 D228 Koreasat 1 (Mugunghwa 1) 1.464 CC 17B [EEO][4] 11/04/95 Delta 2-7920-10 D229 Radarsat 1 / Surfsat 1 2.805 Va 2W LEO/S 12/30/95 Delta 2-7920-10 D230 XTE (RXTE) 3.035 CC 17A LEO 01/14/96 Delta 2-7925 D231 Koreasat 2 (Mugunghwa 2) 1.464 CC 17B GTO 02/17/96 Delta 2-7925-8 D232 NEAR (Discovery 2) 0.818 CC 17B HCO 02/24/96 Delta 2-7925-10 D233 Polar 1.25 Va 2W EEO/P 03/27/96 Delta 2-7925 D234 GPS-2A 16 (USA 117) 1.816 CC 17B MTO 04/24/96 Delta 2-7920-10 D235 MSX 2.7 Va 2W LEO/P 05/23/96 Delta 2-7925 D236 Galaxy 9 1.397 CC 17B GTO 07/16/96 Delta 2-7925 D237 GPS-2A 17 (USA 126) 1.816 CC 17A MTO 09/12/96 Delta 2-7925 D238 GPS-2A 18 (USA 128) 1.816 CC 17A MTO 11/07/96 Delta 2-7925 D239 Mars Global Surveyor 1.03 CC 17A HCO 12/04/96 Delta 2-7925 D240 Mars Pathfinder 0.89 CC 17B HCO 01/16/97 Delta 2-7925 D241 GPS-2R 1 2.032 CC 17A [FTO][5] 05/05/97 Delta 2-7920-10C D242 Iridium 04-08 3.445 VA 2W LEO/P 05/24/97 Delta 2-7925 D243 Thor 2 1.467 CC 17A GTO 07/09/97 Delta 2-7920-10C D244 Iridium 15,17,18,20,21 3.445 VA 2W LEO/P 07/23/97 Delta 2-7925 D245 GPS-2R 2 (USA 132) 2.032 CC 17A MTO 08/21/97 Delta 2-7920-10C D246 Iridium 22-26 3.445 VA 2W LEO/P 08/25/97 Delta 2-7920-8 D247 ACE 0.785 CC 17A HCO 09/25/97 Delta 2-7920-10C D248 Iridium 19, 34-37 3.445 VA 2W LEO/P 11/06/97 Delta 2-7925 D249 GPS-2A 19 (USA 135) 1.816 CC 17A MTO 11/09/97 Delta 2-7920-10C D250 Iridium 38-41, 43 3.445 VA 2W LEO/P 12/20/97 Delta 2-7920-10C D251 Iridium 45-49 3.445 VA 2W LEO/P 01/10/98 Delta 2-7925 D252 Skynet 4D 1.500 CC 17B GTO 02/14/98 Delta 2-7420-10C D253 Globalstar 1-4 1.800 CC 17A LEO 02/18/98 Delta 2-7920-10C D254 Iridium MS-7 (50,52-4,56) 3.445 VA 2W LEO 03/30/98 Delta 2-7920-10C D255 Iridium MS-8 (55,57-60) 3.445 VA 2W LEO 04/24/98 Delta 2-7420-10C D256 Globalstar 6,8,14,15 1.500 CC 17A LEO 05/17/98 Delta 2-7920-10C D257 Iridium MS-9 (70,72-75) 3.445 VA 2W LEO 06/10/98 Delta 2-7925 D258 Thor 3 1.451 CC 17A GTO 09/08/98 Delta 2-7925-10C D260 Iridium MS-10 (77,79-82) 3.445 VA 2W LEO 10/24/98 Delta 2-7326 D261 Deep Space 1 0.486 CC 17A HCO [6] 11/06/98 Delta 2-7920-10C D262 Iridium MS-11 (2,83-86) 3.445 VA 2W LEO 11/22/98 Delta 2-7925 D263 Bonum 1 1.406 CC 17B GTO 12/11/98 Delta 2-7425 D264 Mars Climate Orbiter 0.633 CC 17A HCO 01/03/99 Delta 2-7425 D265 Mars Polar Lander/DS 2 0.574 CC 17B HCO 02/07/99 Delta 2-7426 D266 Stardust (NASA) 0.385 CC 17A HCO [7] 02/23/99 Delta 2-7920-10 D267 ARGOS/Orsted/Sunsat 2.845 VA 2W LEO/S 04/15/99 Delta 2-7920-10C D268 Landsat 7 (NASA) 1.970 VA 2W LEO/S 06/10/99 Delta 2-7420-10C D270 Globalstar 25,47,49,52 1.500 CC 17B LEO 06/24/99 Delta 2-7320-10C D271 FUSE 1.335 CC 17A LEO 07/10/99 Delta 2-7420-10C D272 Globalstar 30,32,35,51 1.500 CC 17B LEO 07/25/99 Delta 2-7420-10C D273 Globalstar 26,28,43,48 1.500 CC 17A LEO 08/17/99 Delta 2-7420-10C D274 Globalstar 24,27,53,54 1.500 CC 17B LEO 10/07/99 Delta 2-7925 D275 GPS 2R-3 2.032 CC 17A MTO 02/08/00 Delta 2-7420-10C D276 Globalstar 60,62-64 1.500 CC 17B LEO 03/25/00 Delta 2-7326 D277 IMAGE 0.494 VA 2W EEO/P 05/11/00 Delta 2-7925 D278 GPS 2R-4 2.032 CC 17A MTO 07/16/00 Delta 2-7925 D279 GPS 2R-5 2.032 CC 17A MTO 11/10/00 Delta 2-7925 D281 GPS 2R-6 2.032 CC 17A MTO 11/21/00 Delta 2-7320-10C D282 EO-1/SAC-C/Munin 0.889 VA 2W LEO/S 01/30/01 Delta 2-7925 D283 GPS 2R-7 2.032 CC 17A MTO 04/07/01 Delta 2-7925 D284 Mars Odyssey 0.725 CC 17A HCO 05/18/01 Delta 2-7925 D285 GeoLITE 1.800 CC 17B GTO 06/30/01 Delta 2-7425-10C D286 MAP 0.800 CC 17B EEO [8] 08/08/01 Delta 2-7326 D287 Genesis 0.636 CC 17A HCO [9] 10/18/01 Delta 2-7320-10C D288 QuickBird 2 1.028 VA 2W LEO/S 12/07/01 Delta 2-7920-10C D289 JASON/TIMED 1.048 VA 2W LEO 02/11/02 Delta 2-7910-10C D290 Iridium (5) IS-1 3.445 VA 2W LEO/S 05/04/02 Delta 2-7920-10L D291 Aqua (NASA) 2.934 VA 2W LEO/S 07/03/02 Delta 2-7425 D292 CONTOUR 1.005 CC 17A EEO [10] 01/13/03 Delta 2-7320-10C D294 ICESat/CHIPSat 1.085 VA 2W LEO/S 01/30/03 Delta 2-7925 D295 GPS 2R-8 2.032 CC 17B MTO 03/31/03 Delta 2-7925 D297 GPS 2R-9 2.032 CC 17A MTO 06/10/03 Delta 2-7925 D298 MER-A (Spirit) 1.063 CC 17A HCO [11] 07/08/03 Delta 2-7925H D299 MER-B (Opportunity) 1.063 CC 17B HCO [11] 08/25/03 Delta 2-7920H D300 SIRTF 0.923 CC 17B HCO [12] 12/21/03 Delta 2-7935 D302 GPS 2R-10 2.032 CC 17A MTO 03/20/04 Delta 2-7925 D303 GPS 2R-11 2.03 CC 17B MTO 04/20/04 Delta 2-7920-10C D304 Gravity Probe B 3.3 VA 2W LEO/P 06/23/04 Delta 2-7925 D305 GPS 2R-12 2.0 CC 17B MTO 07/15/04 Delta 2-7920-10L D306 Aura (NASA) 3.1 VA 2W LEO/S 08/03/04 Delta 2-7925H D307 MESSENGER (NASA) 1.1 CC 17B HCO [13] 11/06/04 Delta 2-7925 D308 GPS 2R-13 2.0 CC 17B MTO 11/20/04 Delta 2-7320-10C D309 SWIFT (NASA) 1.3 CC 17A LEO 01/12/05 Delta 2-7925 D311 Deep Impact 1.4 CC 17B HCO [14] 05/20/05 Delta 2-7320-10C D312 NOAA-N (18) 2.2 VA 2W LEO/S 09/26/05 Delta 2-7925 D313 GPS 2R-14(M1) 2.1 CC 17A MTO 04/28/06 Delta 2-7420-10C D314 CALIPSO/Cloudsat 1.7 VA 2W LEO/S 06/21/06 Delta 2-7925 D316 MITEX A/B 1.1 CC 17A GTO [15] 09/25/06 Delta 2-7925 D318 GPS 2R-15(M) 2.06 CC 17A MTO 10/26/06 Delta 2-7925-10L D319 STEREO (two sats) 1.24 CC 17B EEO 11/17/06 Delta 2-7925 D321 GPS 2R-16(M3) 2.06 CC 17A MTO 12/14/06 Delta 2-7920-10C D322 NRO L-21 VA 2W LEO 02/17/07 Delta 2-7925-10C D323 THEMIS 0.5 CC 17B EEO 06/08/07 Delta 2-7420-10C D324 COSMO/SkyMed 1 1.91 VA 2W LEO/S 08/04/07 Delta 2-7925 D325 Phoenix Mars Lander 0.67 CC 17A HCO 09/18/07 Delta 2-7920-10C D326 WorldView 1 2.5 VA 2W LEO/S 09/27/07 Delta 2-7295H D327 Dawn 1.218 CC 17B HCO [16] 10/17/07 Delta 2-7925 D328 GPS 2R-17 2.059 CC 17A MTO 12/09/07 Delta 2-7420-10C D330 COSMO-Skymed 2 1.90 VA 2W LEO/S 12/20/07 Delta 2-7925 D331 GPS 2R-18 2.06 CC 17A MTO 03/15/08 Delta 2-7925 D332 GPS 2R19 2.06 CC 17A MTO 06/11/08 Delta 2-7920H-10C D333 GLAST 3.37 CC 17B LEO 06/20/08 Delta 2-7320-10C D334 Jason 2 0.506 VA 2W LEO 09/06/08 Delta 2-7420-10C D335 GeoEye 1 1.923 VA 2W LEO/S 10/25/08 Delta 2-7420-10C D336 Cosmo/Skymed 3 1.90 VA 2W LEO/S 02/06/09 Delta 2-7320-10C D338 NOAA-N Prime 1.44 VA 2W LEO/S 03/07/09 Delta 2-7925-10L D339 Kepler 1.05 CC 17B HCO [17] 03/24/09 Delta 2-7925 D340 GPS 2R-20(M) 2.059 CC 17A MTO 05/05/09 Delta 2-7920-10C D341 STSS-ATRR VA 2W LEO/P 08/17/09 Delta 2-7925 D343 GPS 2R-21(M) 2.059 CC 17A MTO 09/25/09 Delta 2-7920-10C D344 STSS Demo 2.244 CC 17B LEO 10/08/09 Delta 2-7920-10C D345 Worldview 2 2.615 VA 2W LEO/S 12/14/09 Delta 2-7320-10C D347 WISE 0.674 VA 2W LEO/S 11/06/10 Delta 2-7420-10C D350 COSMO-SkyMed 4 1.9 VA 2W LEO/S 06/10/11 Delta 2-7320-10C D354 SAC-D/Aquarius 1.35 VA 2W LEO/S 09/10/11 Delta 2-7920H-10C D356 GRAIL A/B 0.614 CC 17B EEO [18] 10/28/11 Delta 2-7920-10C D357 NPP 1.97 VA 2W LEO/S 07/02/14 Delta 2-7320-10C D367 OCO 2 0.453 VA 2W LEO/S 01/31/15 Delta 2-7320-10C D370 SMAP 0.944 VA 2W LEO/S ------------------------------------------------------------------------------------- [1] Standard GPS mission used 3.5 stage Delta 2 to put satellite into a 187 x 20,368 km transfer orbit. A Star 37 apogee kick motor (part of the satellite payload) would fire at first apogee to circularize the orbit. [2] LEO missions typically used 2.5 stage Delta 2. [3] Final Delta with Castor 4A strap on motors, launched Japan's ISAS Geotail into into a highly elliptical orbit, which was subsequently modified by two lunar swingbys into a 57,000 km × 200,000 km x 29 deg orbit. [4] One SRM failed to separate, leaving Koreasat in much lower than planned orbit. [5] Solid Rocket Motor exploded at T+7 seconds, destroying vehicle. [6] Deep Space 1 tested xenon-ion engine. Flew by Asteroid 9962 Braille on 7/29/99 and comet 19P/Borrelly on 09/22/01. [7] Stardust flew by asteriod 5535 Annefrank on 11/02/02 and collected dust samples during flyby of Comet 81P/Wild 2 during January 2004. Returned samples in capsule that parachuted to landing in Utah on 01/15/06. Spacecraft continued an extended mission that flew by comet 9P/Tempel 1 on 02/14/11. [8] Lunar swingby to L2 [9] Genesis orbited the Earth-Sun L-1 point to collect solar wind samples for 30 months. Sample return capsule reentered on 09/09/04, but parachute failed to deploy and capsule crash landed in Utah desert. Cause was improper orientation of gravity switches. Some samples extrated from wrecked capsule. [10] Contour lost on 8/15/02 with Star 30 motor embedded in and part of spacecraft ignited to accelerate Contour from highly elliptic phasing orbit to solar orbit. Motor exhaust plume heating destroyed spacecraft due to improper design. [11] Mars Exploration Rovers. [12] SIRTF (Space Infrared Telescope Facility) was a 1 meter cryo-cooled infrared space telescope placed in solar orbit. Renamed Spitzer Space Telescope once in orbit. [13] MESSENGER entered orbit of Mercury on 03/18/11 after performing an Earth flyby, two Venus flybys, and three Mercury flybys. [14] Deep Impact released impactor that hit comet P/Tempel 1 on 07/04/05. Spacecraft imaged effects of impact during flyby. [15] Payload included new USN liquid fourth stage [16] Dawn, powered by ion engines, orbited asteriod Vesta between July 2011 and September 2012 at altitudes as close as 200 km. Dawn then departed and headed for a planned 2015 encounter with asteriod Ceres. [17] Kepler discovered thousands of exoplanets candidates during landmark mission. [18] Entered polar lunar orbit via. L1 point during a 3.5 month "cruise". Mapped lunar gravity details. *Site Code: CC = Cape Canaveral, FL, USA VA = Vandenberg AFB, CA, USA *Orbit Code: [FTO] = Failed to Orbit [EEO] = Unplanned EEO EEO = Elliptical Earth Orbit EEO/P = EEO Polar Inclination GTO = Geosynchronous Transfer Orbit GTO+ = Supersynchronous Transfer Orbit GTO- = Subsynchronous Transfer Orbit GEO = Geosynchronous Orbit HCO = Heliocentric (solar) Orbit HTO = High Earth Transfer Orbit LEO = Low Earth Orbit LEO/S = Sun Synchronous Low Earth Orbit LEO/P = Polar Low Earth Orbit MEO = Medium Earth Orbit MTO = Medium Earth Transfer Orbit Delta II Payload Planners Guide, October 2000 Last Update: January 31, 2015 |
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