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A Delta II rocket takes off from Cape Canaveral
|Manufacturer||United Launch Alliance|
|Country of origin||United States|
|Cost per launch||US$51 million in 1987 (7920-10 mod.)|
|Height||38.2–39 m (125–128 ft)|
|Diameter||2.44 m (8 ft 0 in)|
|Mass||151,700–231,870 kg (334,440–511,190 lb)|
|Stages||2 or 3|
|Payload to LEO||2,700–6,100 kg (6,000–13,400 lb)|
|Payload to GTO||900–2,170 kg (1,980–4,780 lb)|
|Payload to HCO||1,000 kg (2,200 lb)|
|Launch sites||Cape Canaveral SLC-17|
Vandenberg AFB SLC-2W
Delta 6000: 17
Delta 7000: 132
Delta 7000H: 6
Delta 6000: 17
Delta 7000: 130
Delta 7000H: 6
|Failures||1 (Delta 7000)|
|Partial failures||1 (Delta 7000)|
|Boosters (6000 Series) – Castor 4A|
|Thrust||478 kN (107,000 lbf)|
|Specific impulse||266 s (2.61 km/s)|
|Burn time||56 s|
|Boosters (7000 Series) – GEM 40|
|No. boosters||3, 4, or 9|
|Thrust||492.9 kN (110,800 lbf)|
|Specific impulse||274 s (2.69 km/s)|
|Burn time||64 s|
|Boosters (7000 Heavy) – GEM 46|
|Thrust||628.3 kN (141,200 lbf)|
|Specific impulse||278 s (2.73 km/s)|
|Burn time||75 s|
|First stage – Thor/Delta XLT(-C)|
|Engines||1 RS-27 (6000 series) or RS-27A (7000 series)|
|Thrust||1,054 kN (237,000 lbf)|
|Specific impulse||302 s (2.96 km/s)|
|Burn time||265 s|
|Second stage – Delta K|
|Thrust||43.6 kN (9,800 lbf)|
|Specific impulse||319 s (3.13 km/s)|
|Burn time||431 s|
|Fuel||Template:N2O4 / Aerozine 50|
|Third stage – PAM-D (optional)|
|Thrust||66 kN (15,000 lbf)|
|Specific impulse||286 s (2.80 km/s)|
|Burn time||87 s|
Delta II was a rocket used to launch various projects into space. The Delta series of rockets were first designed and made by McDonnell Douglas. This company joined with Boeing in 1997. Delta II rockets had been made since 2006 by United Launch Alliance, which is a joint company owned by Boeing and Lockheed Martin to supply launch rockets to the US government. Boeing Launch Services supplied Delta II rockets to private companies.
The Delta II rockets were based on the Thor rockets built in the 1950's. These were used to carry Inter Continental Ballistic Missiles. The first Thor was launched on January 26, 1957. The Delta II rocket was first launched on 14 February 1989. The rocket was developed after the explosion of the Space Shuttle Challenger in 1986. The US Air Force needed another way to launch its GPS satellites. As of 2018, there had been 156 Delta II launches from both Cape Canaveral Air Force Station and the Vandenberg Air Force Base. Only two launches were unsuccessful. On 5 August 1995, a rocket motor failure meant the Koreasat 1 was put into a lower orbit. On 17 January 1997, Delta 241 carrying the GPS IIR-1 exploded 13 seconds after taking off.
- "Archived copy". Archived from the original on July 14, 2014. https://web.archive.org/web/20140714122955/http://www.spaceflight101.com/delta-ii-7920h-10.html. Retrieved July 1, 2014.
- "Archived copy". Archived from the original on November 3, 2006. https://web.archive.org/web/20061103194958/http://www.boeing.com/defense-space/space/delta/delta2/delta2.htm. Retrieved November 3, 2006.
- Graham, William (October 28, 2011). "Delta II successfully launches NPP satellite on behalf of NASA and NOAA". nasaspaceflight.com. http://www.nasaspaceflight.com/2011/10/live-delta-ii-launch-npp-satellite-nasa-and-noaa/. Retrieved November 6, 2012.
- Graham, William (July 2, 2014). "ULA Delta II successfully lofts OCO-2 to orbit". http://www.nasaspaceflight.com/2014/07/delta-ii-oco-2-launch-vandenberg/. Retrieved July 23, 2014.
- "NASA Selects Launch Services Contract For Three Missions". MarketWatch. 16 July 2012. http://www.marketwatch.com/story/nasa-selects-launch-services-contract-for-three-missions-2012-07-16. Retrieved 16 July 2012.
- "NASA Selects Launch Services for ICESat-2 Mission". NASA Kennedy Space Center. 22 February 2013. http://www.nasa.gov/centers/kennedy/news/releases/2013/release-20130222b.html. Retrieved 15 March 2013.