Orbital Sciences Corp Minotaur 4+ launch TacSat-4


Minotaur IV/TacSat-4


Launch Date: September 27, 2011
Launch Location: Kodiak Launch Complex, Alaska
Mission Customer: U.S. Air Force Space and Missile Systems Center (SMC)

For Immediate Release



— Successful Flight of Minotaur IV Extends Perfect Launch Record of 

Minotaur Family to 23 Missions —

(Dulles, VA 27 September 2011) – Orbital Sciences Corporation (NYSE: ORB), one of the world’s leading space technology companies, announced today that its Minotaur IV space launch vehicle was successfully launched for the U.S. Air Force, placing the U.S. Navy’s Tactical Satellite-4 (TacSat-4) into a precise orbit of the Earth. The Operationally Responsive Space (ORS) Office is the launch sponsor of the TacSat-4 program, which is demonstrating the use of standard interfaces to shorten development timelines and delivering tactical capabilities to the foot soldier.

The mission originated from the Kodiak Launch Complex in Alaska on September 27, 2011.  The rocket’s first stage ignited at 11:49 a.m. (EDT), beginning its flight into low-Earth orbit. Approximately 28 minutes later, the Minotaur IV deployed the TacSat-4 satellite into its targeted highly elliptical orbit of approximately 7,415 miles (11,865 kilometers) by 115 miles (185 kilometers) above the Earth’s surface.  The TacSat-4 launch was the fifth Minotaur IV flight and the 23rd overall mission for the Minotaur product line over the last 11 years, all of which have been successful.

“The successful Minotaur IV flight continues our well-established record of mission success for the Minotaur rocket family.  Orbital is proud to support the U.S. Air Force with the newest member of the Minotaur launch vehicle family for the operationally responsive TacSat program,” said Mr. Ron Grabe, Orbital’s Executive Vice President and General Manager of its Launch Systems Group. “With a perfect track record of 23 successful launches over the last 11 years, the Minotaur family has proven to be a valuable asset for the Department of Defense to meet its space launch needs.”

The Minotaur family of launch vehicles is based on government-furnished Peacekeeper and Minuteman rocket motors that Orbital has upgraded and integrated with modern avionics and other subsystems to produce a cost-effective launcher based on flight-proven hardware.  The Minotaur product line utilizes standardized avionics and subsystems, mature processes and experienced personnel to make them reliable and cost effective.  Minotaur rockets are capable of launching from all major U.S. spaceports, including launch sites in Alaska, California, Florida and Virginia.

About Minotaur IV

The Minotaur IV is a four-stage space launch vehicle that uses flight-proven propulsion, avionics and other subsystems.  It leverages the experience of the Air Force’s Peacekeeper ICBM program, along with the extensive flight heritage of Orbital’s Minotaur I, Pegasus® and Taurus® space launch vehicles to produce a highly reliable launcher for U.S. government space programs.

The space launch configuration of Minotaur IV is made up of three decommissioned Peacekeeper solid fuel rocket motors that Orbital has upgraded and integrated with modern avionics and other subsystems, combined with a commercially-supplied solid-fuel upper stage. For the TacSat-4 mission, Orbital flew an enhanced performance configuration of the Minotaur IV which utilizes a STAR 48 solid fuel motor with thrust vector control as the fourth stage, replacing the Orion 38 motor that had flown on the previous two Minotaur IV space launches.   Minotaur IV is capable of launching payloads up to 4,000 lbs. (or 1,800 kg.) to low-Earth orbit.

About Orbital

Orbital develops and manufactures small- and medium-class rockets and space systems for commercial, military and civil government customers.  The company’s primary products are satellites and launch vehicles, including low-Earth orbit, geosynchronous-Earth orbit and planetary exploration spacecraft for communications, remote sensing, scientific and defense missions; human-rated space systems for Earth-orbit, lunar and other missions; ground- and air-launched rockets that deliver satellites into orbit; and missile defense systems that are used as interceptor and target vehicles.  Orbital also provides satellite subsystems and space-related technical services to U.S. Government agencies and laboratories.  More information about Orbital can be found at http://www.orbital.com.

# # #


For More Information Contact: Barron Beneski (703) 406-5528 Public and Investor Relations beneski.barron@orbital.com



TacSat-4 Time-lapse Encapsulation Video

In this time-lapse video, the Naval Research Laboratory’s Tactical Satellite IV (TacSat-4) is encapsulated inside the fairing (nose cone) of an Orbital Sciences Corporation Minotaur-IV+ launch vehicle in preparation for a Sept. 27, 2011, launch from the Alaska Aerospace Corporation’s Kodiak Launch Complex.

You can watch the TacSat-4 launch live on Sept 27, 2011, between 1149 am and 1256 pm eastern by visiting http://on.fb.me/nSSiNp. For more NRL videos, visit http://www.nrl.navy.mil/media/videos/.

TacSat-4 is a Navy-led joint mission which provides 10 Ultra High Frequency channels and allows troops using existing radios to communicate on-the-move from obscured regions without the need for dangerous antenna positioning and pointing. To augment current geosynchronous satellite communication, the TacSat-4 spacecraft will be deployed into a unique, highly elliptical orbit with an apogee in the high latitudes of 12,050 kilometers.

The Office of Naval Research (ONR) sponsored the development of the payload and the first year of operations. The Operationally Responsive Space (ORS) Office funded the launch that is managed by the Space Development and Test Directorate, a directorate of the Air Force Space and Missile Systems Center (SMC).

The spacecraft bus was built by NRL and Johns Hopkins University Applied Physics Laboratory (APL) to mature ORS bus standards. It was developed by an Integrated (government and industry) System Engineering Team, the “ISET Team,” with active representation from AeroAstro, Air Force Research Laboratory, Johns Hopkins Laboratory APL, ATK Space, Ball Aerospace and Technologies, Boeing, Design Net Engineering, General Dynamics AIS, Microcosm, Microsat Systems Inc., Massachusetts Institute of Technology Lincoln Laboratory, Orbital Sciences, NRL, SMC, Space System Loral, and Raytheon. The Department of Defense Office of the Director of Defense Research and Engineering funded the standardized spacecraft bus.

TacSat-4 will be the 100th NRL built satellite launched into a celestial orbit.

(U.S. Navy photos: Jamie Hartman, Naval Research Laboratory)

Leave a Reply

You can use these HTML tags

<a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <s> <strike> <strong>