Encyclopedia Astronautica
Pegasus H



pegasus.jpg
Pegasus
Credit: Orbital Sciences Corporation
American air-launched orbital launch vehicle. Four stage vehicle consisting of 1 x L-1011 + 1 x Orion 50S + 1 x Orion 50 + 1 x Orion 38

LEO Payload: 350 kg (770 lb).

Status: Retired 2000.
Gross mass: 18,500 kg (40,700 lb).
Payload: 350 kg (770 lb).
Height: 15.50 m (50.80 ft).
Diameter: 1.28 m (4.19 ft).
Thrust: 580.00 kN (130,380 lbf).
Apogee: 4,000 km (2,400 mi).
First Launch: 1995.04.03.
Last Launch: 2000.10.09.
Number: 4 .

More... - Chronology...


Associated Countries
Associated Spacecraft
  • MSTI American military strategic defense satellite. 3 launches, 1992.11.21 (MSTI) to 1996.05.17 (MSTI-3). BMDO technology demonstration; Miniature Seeker Technology Demonstration. More...
  • SCD Brazilian communications technology satellite. 3 launches, 1993.02.09 (SCD-1) to 1998.10.23 (SCD-2). Environmental data relay. More...
  • Microstar American communications technology satellite. 22 launches, 1995.04.03 (Orbcomm F1) to 2008.10.19 (Formosat 3F). Small satellite bus, specially designed for multiple launch by Pegasus or Taurus family launch vehicles. More...
  • HETE American gamma ray astronomy satellite. 2 launches, 1996.11.04 (HETE) and 2000.10.09 (HETE-2). The High Energy Transient Experiment (HETE) was an international mission led by The Massachusetts Institute of Technology (MIT). More...

See also
  • Pegasus Privately-funded, air-launched winged light satellite launcher. More...

Associated Manufacturers and Agencies
  • OSC American manufacturer of rockets, spacecraft, and rocket engines. Orbital Sciences Corporation, USA. More...

Associated Programs
  • Orbcomm Orbcomm was a commercial venture to provide global messaging services using a constellation of 26 low-Earth orbiting satellites. More...

Associated Launch Sites
  • Point Arguello WADZ Air-launched rocket drop zone known to have been used for 28 launches from 1990 to 2007, reaching up to 4539 kilometers altitude. More...
  • Mayport DZ Air-launched rocket drop zone known to have been used for 5 launches from 1993 to 2003, reaching up to 794 kilometers altitude. More...
  • Kwajalein DZ Air-launched rocket drop zone known to have been used for 1 launch in 2000, reaching up to 641.4927 kilometers altitude. More...

Associated Stages
  • L-1011 Subsonic rocket launch aircraft. Loaded/empty mass 156,000/109,629 kg. Thrust 561.90 kN. Specific impulse 9900 seconds. Lockheed airliner swept wing. Release conditions: Belly-mounted, 36,800 kg, 17.1 m length x 7.9 m span at 925 kph at 11,890 m altitude More...
  • Orion 50S Solid propellant rocket stage. Loaded/empty mass 14,020/1,868 kg. Thrust 484.91 kN. Vacuum specific impulse 294 seconds. More...
  • Orion 50 Solid propellant rocket stage. Loaded/empty mass 3,370/345 kg. Thrust 118.20 kN. Vacuum specific impulse 292 seconds. More...
  • Pegasus-3 Solid propellant rocket stage. Loaded/empty mass 985/203 kg. Thrust 34.57 kN. Vacuum specific impulse 293 seconds. More...

Pegasus H Chronology


1995 April 3 - . 13:48 GMT - . Launch Site: Point Arguello WADZ. Launch Pad: 36.0 N x 123.0 W. Launch Platform: L-1011. LV Family: Pegasus. Launch Vehicle: Pegasus H. LV Configuration: Pegasus H F8.
  • Orbcomm F1 - . Payload: Orbcomm s/n FM1. Mass: 40 kg (88 lb). Nation: USA. Agency: Orbcomm. Program: Orbcomm. Class: Communications. Type: Civilian communications satellite. Spacecraft: Microstar. USAF Sat Cat: 23545 . COSPAR: 1995-017A. Apogee: 747 km (464 mi). Perigee: 728 km (452 mi). Inclination: 69.9800 deg. Period: 99.56 min. Summary: Commercial communications testbed. Plane F. Ascending node 199.1 degrees..
  • Orbview-1 - . Payload: Microlab 1. Mass: 74 kg (163 lb). Nation: USA. Agency: Orbimage. Program: Orbview. Class: Earth. Type: Atmosphere satellite. Spacecraft: Microstar. USAF Sat Cat: 23547 . COSPAR: 1995-017C. Apogee: 747 km (464 mi). Perigee: 733 km (455 mi). Inclination: 70.0000 deg. Period: 99.60 min. Summary: Lightning mapper; GPS radio occultation..
  • Orbcomm F2 - . Payload: Orbcomm s/n FM2. Mass: 40 kg (88 lb). Nation: USA. Agency: Orbcomm. Program: Orbcomm. Class: Communications. Type: Civilian communications satellite. Spacecraft: Microstar. USAF Sat Cat: 23546 . COSPAR: 1995-017B. Apogee: 747 km (464 mi). Perigee: 728 km (452 mi). Inclination: 69.9800 deg. Period: 99.56 min. Summary: Commercial communications testbed. Plane F. Ascending node 198.5 degrees..

1996 May 17 - . 02:44 GMT - . Launch Site: Point Arguello WADZ. Launch Pad: 36.0 N x 123.0 W. Launch Platform: L-1011. LV Family: Pegasus. Launch Vehicle: Pegasus H. LV Configuration: Pegasus H F11.
  • MSTI-3 - . Payload: MSTI 3. Nation: USA. Agency: BMDO. Class: Military. Type: Strategic defense satellite. Spacecraft: MSTI. Decay Date: 1997-12-11 . USAF Sat Cat: 23868 . COSPAR: 1996-031A. Apogee: 432 km (268 mi). Perigee: 420 km (260 mi). Inclination: 97.1000 deg. Period: 90.70 min. Summary: LEO. Sensor technology tests .

1998 October 23 - . 00:02 GMT - . Launch Site: Mayport DZ. Launch Pad: 29.0 N x 78.3 W. Launch Platform: L-1011. LV Family: Pegasus. Launch Vehicle: Pegasus H. LV Configuration: Pegasus H F24/P-33.
  • SCD-2 - . Mass: 110 kg (240 lb). Nation: Brazil. Agency: McLean. Manufacturer: INPE. Class: Communications. Type: Civilian communications satellite. Spacecraft: SCD. USAF Sat Cat: 25504 . COSPAR: 1998-060A. Apogee: 760 km (470 mi). Perigee: 736 km (457 mi). Inclination: 25.0000 deg. Period: 99.80 min. Brazil's SCD-2 satellite was aboard Orbital Science's L-1011 Stargazer aircraft when it took off from the Cape Canaveral Air Station's Skid Strip (Runway 02/20, 28.2N 80.6W) at 23:05 GMT on Oct 22 and flew to the drop zone near Cape Canaveral (in the Mayport, Florida, Warning Area) at 29.0N 78.3W. The Pegasus ignited 5 seconds after drop. The first stage carried a NASA experiment attached to its right wing, to study hypersonic boundary layer separation. The 115 kg Satelite de Coleta de Dados (Data Collection Satellite) relays data from environmental monitoring stations.

2000 October 9 - . 05:38 GMT - . Launch Site: Kwajalein DZ. Launch Pad: 7.7 N x 167.7 E. Launch Platform: L-1011. LV Family: Pegasus. Launch Vehicle: Pegasus H. LV Configuration: Pegasus H F30/P-35.
  • HETE-2 - . Mass: 130 kg (280 lb). Nation: USA. Agency: NASA Greenbelt. Manufacturer: MIT. Class: Astronomy. Type: X-ray astronomy satellite. Spacecraft: HETE. USAF Sat Cat: 26561 . COSPAR: 2000-061A. Apogee: 641 km (399 mi). Perigee: 598 km (372 mi). Inclination: 1.9497 deg. Period: 97.02 min. First orbital launch from Kwajalein. Second High Energy Transient Explorer; built by MIT using leftover parts from the first HETE. This failed to operate because of a Pegasus adapter failure during launch in November 1996. MIT operates the satellite, while the program is managed by NASA GSFC as an Explorer mission of opportunity. HETE's main instrument is FREGATE, the French Gamma Telescope, a hard X-ray spectrometer operating in the 6 to 400 keV energy range. This gamma ray burst detector, together with a Wide Field X-ray Monitor hard X-ray coded mask telescope, is used to trigger searches with the two Soft X-ray Imagers which have 33-arcsecond spatial resolution. This will let astronomers get precise locations for gamma-ray bursts, allowing detailed follow-up with optical instruments. The satellite is in a 595 x 636 km x 2.0 deg equatorial orbit, and sends data to a network of small ground terminals spaced around the equator.

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