The launch of an Antares 110 rocket
|Function||Medium expendable launch system|
|Manufacturer||Orbital Sciences (main)
Yuzhnoye Design Bureau (sub)
|Country of origin||United States|
|Height||110/120: 40.5 m (133 ft)
130: 41.9 m (137 ft)
|Diameter||3.9 m (13 ft)|
|Mass||~240,000 kg (530,000 lb)|
|Stages||2 to 3|
|6,120 kg (13,490 lb)|
|Status||Grounded Pending Investigation|
|Launch sites||MARS LP-0A
|Total launches||5 (110: 2, 120: 2, 130: 1)|
|Successes||4 (110: 2, 120: 2, 130: 0)|
|First flight||110: April 21, 2013
120: January 9, 2014
130: October 28, 2014
|Engines||2 × Aerojet AJ26-62|
|Thrust||3,265 kN (734,000 lbf)|
|Burn time||230 seconds|
|Engines||1 × Castor 30A/B/XL|
|Thrust||30A: 259 kN (58,200 lbf)
30B: 293.4 kN (65,960 lbf)
Antares, (//) known during early development as Taurus II, is an expendable launch system developed by Orbital Sciences Corporation. Able to launch payloads heavier than 5,000 kg (11,000 lb) into low-Earth orbit, it made its inaugural flight on April 21, 2013. Designed to launch the Cygnus spacecraft to the International Space Station as part of NASA's COTS and CRS programs, Antares is the largest rocket operated by Orbital Sciences.
NASA awarded Orbital a Commercial Orbital Transportation Services (COTS) Space Act Agreement (SAA) in 2008 to demonstrate delivery of cargo to the International Space Station. For these COTS missions Orbital intends to use Antares to launch its Cygnus spacecraft. In addition, Antares will compete for small-to-medium missions. On December 12, 2011, Orbital Sciences renamed the launch vehicle "Antares" from the previous designation of Taurus II, after the star of the same name.
The first four Antares launch attempts were successful. During the fifth launch from Mid-Atlantic Regional Spaceport on October 28, 2014, the rocket failed catastrophically, and the vehicle and payload were destroyed.
The NASA COTS award was for US$171 million and Orbital Sciences expected to invest an additional $150 million, split between $130 million for the booster and $20 million for the spacecraft. As of April 2012, development costs were estimated at $472 million.
On June 10, 2008 it was announced that the Mid-Atlantic Regional Spaceport, formerly part of the Wallops Flight Facility, in Virginia, would be the primary launch site for the rocket. Launch pad 0A (LP-0A), previously used for the failed Conestoga rocket, would be modified to handle Antares. Wallops allows launches which reach the International Space Station's orbit as effectively as those from Cape Canaveral, Florida, while being less crowded. The first Antares flight launched a Cygnus mass simulator.
On December 10, 2009 Alliant Techsystems Inc. (ATK) test fired their Castor 30 motor for use as the second stage of the Antares rocket. In March 2010 Orbital Sciences and Aerojet completed test firings of the NK-33 engines. On February 22, 2013 a hot fire test was successfully performed, the entire first stage being erected on the pad and held down while the engines fired for 29 seconds.
The first stage uses RP-1 (kerosene) and liquid oxygen (LOX) as propellants, powering two Aerojet AJ26 engines, which are modified Soviet-built NK-33 engines. Together they produce 3,265 kilonewtons (734,000 lbf) of thrust at sea level and 3,630 kN (816,100 lbf) in vacuum. As Orbital has little experience with large liquid stages and LOX propellant, some of the Antares first stage work was contracted to the Ukrainian Yuzhnoye SDO, designers of the Zenit series. The core provided by Yuzhnoye includes propellant tanks, pressurization tanks, valves, sensors, feed lines, tubing, wiring and other associated hardware.
Like Zenit, the Antares vehicle has a diameter of 3.9 m (150 in) with a matching 3.9 m payload fairing. The fairing is manufactured by Applied Aerospace Structures Corporation of Stockton, California, which also builds other composite structures for the vehicle, including the fairing adaptor, stage 2 motor adaptor, stage 2 interstage, payload adaptor, and avionics cylinder.
The second stage is a solid-fuel rocket, the Castor 30. Developed by ATK as a derivative of the Castor 120 solid stage, the Castor 30B produces 293.4 kN (65,960 lbf) average and 395.7 kN (88,960 lbf) maximum thrust, and uses electromechanical thrust vector control. Antares' Castor 30 solid stage was based on the Castor 120 solid motor used as Minotaur-C's first stage. The first two flights of Antares used a Castor 30A, followed by two flights of the Antares 120 using an enhanced Castor 30B. The longer Castor 30XL second stage will be used on subsequent ISS resupply flights, allowing Antares to carry larger Enhanced Cygnus.
Orbital Sciences offers two optional third stages, the Bi-Propellant Third Stage (BTS) and an ATK Star 48-based third stage. BTS is derived from Orbital Sciences' GEOStar spacecraft bus and uses nitrogen tetroxide and hydrazine for propellant; it is intended to precisely place payloads into their final orbits. The Star 48-based stage uses a Star 48BV solid rocket motor and is planned to be used for higher energy orbits.
First-stage engine change
In late October 2014, the Russian news agency TASS reported that Orbital Sciences has preliminarily selected the Russian RD-193 as the new engine to power the rocket that Orbital intends to use in its contract proposal to NASA for the second phase of the commercial resupply services to the ISS. The current engine used in the initial version of the Antares launch vehicle first stage is an Aerojet AJ-26, which is a remanufactured Russian NK-33 engine.
Configurations and numbering
The first two test flights used the Antares 110 configuration, with a Castor 30A second stage and no third stage. Subsequent flights will use either a Castor 30B or Castor 30XL. The rocket's configuration is indicated by a three-digit number, the first number representing the first stage, the second the type of second stage, and the third the type of third stage.
|Number||First digit||Second digit||Third digit|
|(First stage)||(Second stage)||(Third stage)|
|0||N/A||N/A||No third stage|
|1||Standard first stage
(2 × AJ26-62)
(3 × IHI BT-4)
|2||N/A||Castor 30B||Star 48BV|
Originally scheduled for 2012, the first Antares launch, designated A-ONE was conducted on April 21, 2013, carrying the Cygnus Mass Simulator (a boilerplate Cygnus spacecraft) and four CubeSats contracted by Spaceflight Incorporated: Dove 1 for Cosmogia Incorporated (now Planet Labs) and three PhoneSat satellites – Alexander, Graham and Bell for NASA.
Prior to the launch, a 27-second test firing of the rocket's AJ26 engines was conducted successfully on February 22, 2013, following an attempt on February 13 which was abandoned before ignition.
A-ONE used the Antares 110 configuration, with a Castor 30A second stage and no third stage. The launch took place from Pad 0A of the Mid-Atlantic Regional Spaceport on Wallops Island, Virginia. LP-0A was a former Conestoga launch complex which had only been used once before, in 1995, for the Conestoga's only orbital launch attempt. Antares became the largest — and first — liquid-fuelled rocket to fly from Wallops Island, as well as the largest rocket launched by Orbital Sciences.
The first attempt to launch the rocket, on April 17, 2013, was scrubbed after an umbilical detached from the rocket's second stage, and a second attempt on April 20 was scrubbed due to high altitude winds. At the third attempt on April 21, the rocket lifted off at the beginning of its launch window. The launch window for all three attempts was three hours beginning at 21:00 UTC (17:00 EDT), shortening to two hours at the start of the terminal count, and ten minutes later[clarification needed] in the count.
October 2014 incident
On October 28, 2014, the first stage of an Antares rocket on an unmanned resupply mission carrying Cygnus CRS Orb-3 failed catastrophically six seconds after liftoff from Mid-Atlantic Regional Spaceport at Wallops Flight Facility, Virginia. The flight termination system was activated just before the rocket hit the ground, but an explosion and fire destroyed the vehicle and cargo. There were no casualties, and Launch Pad 0A escaped significant damage. Orbital Sciences formed an anomaly investigation board shortly after the launch failure to investigate the cause of the incident.
List of missions
|1||Antares A-ONE||Standard||April 21, 2013
|Antares 110||Success||Antares test flight, using a Castor 30A second stage and no third stage.|||
|2||Orb-D1||G. David Low Cygnus||Standard||September 18, 2013
|Success||Orbital Sciences COTS demonstration flight. First Cygnus mission, first mission to rendezvous with ISS, first mission to berth with ISS, second launch of Antares. The rendezvous between the new Cygnus cargo freighter and the International Space Station was delayed due to a computer data link problem, but the issue was resolved and berthing followed shortly thereafter.|||
|3||CRS Orb-1||C. Gordon Fullerton Cygnus||Standard||January 9, 2014
|Antares 120||Success||First Commercial Resupply Service (CRS) mission for Cygnus, and first Antares launch using the Castor 30B upper stage.|||
|4||CRS Orb-2||Janice Voss Cygnus||Standard||July 13, 2014
|Success||Spacecraft carried 1,664 kg (3,668 lb) of supplies for the ISS, including research equipment, crew provisions, hardware, and science experiments.|||
|5||CRS Orb-3||Deke Slayton Cygnus||Standard||October 28, 2014
|Antares 130||Failure||First Antares launch to use Castor 30XL upper stage; payload included a Planetary Resources Arkyd-3 satellite and a NASA JPL/UT-Austin CubeSat mission named RACE. The Antares rocket encountered an anomaly seconds into the mission leading to the explosion of the rocket and loss of the payload.|||
|6||CRS Orb-4||Cygnus spacecraft||Enhanced||April 1, 2015||Planned||Planned to be first Enhanced Cygnus mission. Will potentially be moved to a non-Antares launch vehicle.|||
|7||CRS Orb-5||Enhanced||TBD||Planned||Will potentially be moved to a non-Antares launch vehicle.|||
|T- 03:50:00||Launch management call to stations|
|T- 03:05:00||Poll to initiate liquid oxygen loading system chilldown|
|T- 01:30:00||Poll for readiness to initiate propellant loading|
|T- 00:15:00||Cygnus/payload switched to internal power|
|T- 00:12:00||Poll for final countdown and MES medium flow chilldown|
|T- 00:11:00||Transporter-Erector-Launcher (TEL) armed for rapid retract|
|T- 00:05:00||Antares avionics switched to internal power|
|T- 00:03:00||Auto-sequence start (terminal count)|
|T- 00:02:00||Pressurize propellant tanks|
|T- 00:00:00||Main engine ignition|
|T+ 00:03:55||Main engine cut-off (MECO)||102 km (63 mi)|
|T+ 00:04:01||Stage one separation||108 km (67 mi)|
|T+ 00:05:31||Fairing separation||168 km (104 mi)|
|T+ 00:05:36||Interstage separation||170 km (106 mi)|
|T+ 00:05:40||Stage two ignition||171 km (106 mi)|
|T+ 00:07:57||Stage two burnout||202 km (126 mi)|
|T+ 00:09:57||Payload separation||201 km (125 mi)|
- Kyle, Ed (May 14, 2011). "Taurus 2". Space Launch Report.
- "Antares Medium-class Launch Vehicle: Fact Sheet" (PDF). Orbital Sciences Corporation. 2013. Archived from the original on June 3, 2013. Retrieved April 25, 2013.
- "Antares" (Press release). Orbital Sciences Corporation. Retrieved August 5, 2014.
- Perrotto, Trent J. (April 21, 2013). "NASA Partner Orbital Sciences Test Launches Antares Rocket" (Press release). NASA. Retrieved April 25, 2013.
- "ISS Commercial Resupply Services Mission (Orb-1)". Orbital Sciences Corporation. Retrieved January 8, 2014.
- "Antares Medium-Class Launch Vehicle: Brochure" (PDF). Orbital Sciences Corporation. 2013. Archived from the original on September 2, 2014. Retrieved April 25, 2012.
- Graham, William (April 21, 2013). "Antares conducts a flawless maiden launch". NASA Spaceflight. Retrieved April 22, 2013.
- Aviation Week and Space Technology: 22. February 25, 2008.
- Beneski, Barron (December 12, 2011). "Orbital Selects "Antares" as Permanent Name for New Rocket Created by the Taurus II R&D Program" (Press release). Orbital Sciences Corporation.
- Queally, James; Hennigan, W. J.; Raab, Lauren (October 28, 2014). "Rocket bound for space station blows up just after liftoff". Los Angeles Times. Retrieved November 8, 2014.
- Bergin, Chris (February 25, 2008). Space News. p. 12.
- Rosenberg, Zach (April 30, 2012). "Orbital Sciences development costs increase". Flight International via Flightglobal.com.
- Hickey, Gordon (June 9, 2008). "Governor Kaine announces 125 new jobs for Virginia" (Press release). Commonwealth of Virginia via YesVirginia.org.
- Kennedy, Jack (June 13, 2008). "Taurus-2 Launch Pad to be Ready in 18-Months at Wallops Island Spaceport". Spaceports. Blogspot.com.
- Glass, Jon W. (February 20, 2008). "Wallops up for big role with firm's NASA contract". The Virginian-Pilot via HamptonRoads.com.
- Bergin, Chris (February 22, 2013). "Hot fire success for Orbital's Antares". NASA Spaceflight. Retrieved February 23, 2013.
- Beneski, Barron (December 10, 2009). "Second Stage Rocket Motor Of Orbital's Taurus II Launcher Successfully Ground Tested" (Press release). Orbital Sciences Corporation.
- Clark, Stephen (March 15, 2010). "Aerojet confirms Russian engine is ready for duty". Spaceflight Now. Archived from the original on March 22, 2010. Retrieved March 18, 2010.
- "Antares User's Guide, Rev. 1.2" (PDF). Orbital Sciences Corporation. December 2009.
- "Antares Launch Vehicle". Applied Aerospace Structures Corporation. Retrieved April 26, 2014.
- "CASTOR 30-A Multi-use Motor". ATK.com. Retrieved July 2014.
- Bergin, Chris (February 22, 2012). "Space industry giants Orbital upbeat ahead of Antares debut". NASA Spaceflight. Retrieved March 29, 2012.
- Bergin, Chris (March 5, 2013). "CASTOR 30XL prepares for static fire ahead of providing Antares boost". NASA Spaceflight. Retrieved March 7, 2013.
- "Orbital Sciences likely to choose Russian engine for new Antares rocket". TASS. October 31, 2014. Retrieved October 31, 2014.
- Bergin, Chris (March 17, 2013). "Stars align for Orbital's Antares – A-One debut set for mid-April". NASA Spaceflight. Retrieved April 22, 2013.
- Clark, Stephen (April 21, 2013). "Antares test launch paves new highway to space station". Spaceflight Now. Retrieved April 22, 2013.
- Krebs, Gunter. "PhoneSat v2". Gunter's Space Page. Retrieved April 22, 2013.
- Krebs, Gunter. "PhoneSat v1". Gunter's Space Page. Retrieved April 22, 2013.
- Weil, Martin (April 21, 2013). "Wind postpones rocket launch at Wallops Flight Facility". The Washington Post.
- Amos, Jonathan (April 21, 2013). "Orbital's Antares rocket makes test flight". BBC News. Retrieved April 22, 2013.
- "Antares explodes moments after launch". Spaceflight Now. 28 October 2014. Retrieved 28 October 2014.
- "ISS Commercial Resupply Services Mission (Orb-3)". Orbital Sciences Corporation. 2014. Archived from the original on October 31, 2014. Retrieved October 31, 2014.
- Wall, Mike (28 October 2014). "Private Orbital Sciences Rocket Explodes During Launch, NASA Cargo Lost". Space.com (Purch). Retrieved 28 October 2014.
- "ISS Commercial Resupply Services Mission (Orb-3)" (Press release). Orbital Sciences Corporation. 30 October 2014. Archived from the original on 31 October 2014. "no evidence of significant damage"
- "ISS Commercial Resupply Services Mission (Orb-3)". Orbital Sciences Corporation. Archived from the original on October 28, 2014. Retrieved October 28, 2014.
- "Antares Cold Flow Testing Begins and Antares A-ONE Gets All Dressed Up". Orbital Sciences Corporation. December 2012. Archived from the original on March 6, 2013. Retrieved March 5, 2013.
- Dunn, Marcia (September 22, 2013). "Computer mishap delays space station supply ship Cygnus". The Washington Post. Retrieved September 22, 2013.
- Bergin, Chris (September 28, 2013). "Orbital’s Cygnus successfully berthed on the ISS". NASA Spaceflight. Retrieved October 8, 2013.
- Clark, Stephen (May 6, 2013). "First flight of Cygnus cargo craft delayed to September". Spaceflight Now. Retrieved August 7, 2013.
- Pearlman, Robert Z. (December 9, 2013). "Orbital names next space station freighter for late pilot-astronaut". CollectSpace.com. Retrieved December 9, 2013.
- "Worldwide launch schedule". Spaceflight Now. Archived from the original on August 11, 2013. Retrieved August 9, 2013.
- "ISS Commercial Resupply Services Mission (Orb-2)". Orbital Sciences Corporation. 2014. Archived from the original on April 7, 2014. Retrieved July 13, 2014.
- Wilhelm, Steve (October 16, 2014). "First step toward asteroid mining: Planetary Resources set to launch test satellite". Puget Sound Business Journal. Retrieved October 19, 2014.
- "RACE Mission". NASA. Archived from the original on October 28, 2014. Retrieved October 28, 2014.
- "RACE Satellite Launching to ISS". University of Texas at Austin. Archived from the original on October 28, 2014. Retrieved October 28, 2014.
- "Orbital Sciences Commercial Resupply Launch". NASA. Archived from the original on October 19, 2014. Retrieved October 19, 2014.
- "Launch Manifest". Orbital Sciences Corporation. Archived from the original on December 11, 2013. Retrieved December 8, 2013.
- "International Space Station Schedule". Spaceflight101.com. 29 October 2014. Retrieved 5 November 2014.
- "Orbital Announces Go-Forward Plan for NASA's Commercial Resupply Services Program and the Company's Antares Launch Vehicle". orbital.com. Orbital Sciences Corporation. 5 November 2014. Retrieved 5 November 2014.
- "Orbital-2 Mission to the International Space Station Media Press Kit". NASA. July 2014. Retrieved 13 July 2014.
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