Encyclopedia Astronautica

Oersted satellite
Oersted satellite
Orsted Deployment 1
Orsted Boom Deployment - Step 1
Orsted Deployment 2
Orsted Boom Deployment - Step 2
Orsted Deployment 3
Orsted Boom Deployment - Step 3
Orsted Deployment 4
Orsted Boom Deployment - Step 4
Orsted Deployment 5
Orsted Boom Deployment - Step 5
Danish earth magnetosphere satellite. One launch, 1999.02.23.

Ørsted, the first Danish satellite, carried five science instruments with the objective of mapping the Earth's magnetic field and measuring its associated high-energy charged particle environment. Data from the mission was used to improve geomagnetic models, study the auroral phenomena, and complements data taken by the Magsat spacecraft in the late 70's-early 80's.

Ørsted was gravity gradient stabilized using a deployable 8 meter instrument boom. Magnetic torque coils maintained yaw to within 10 degrees. Attitude determination was via a star camera, with sun sensors and magnetometers as backup. 5 body mounted solar panels with GaAs cells provided 54 watts average power (EOL). NiCd batteries provided power in eclipse. Position determination was provided with GPS receivers: a single-band 6-channel TANS receiver from Trimble, and a dual-band 8-channel GPS TurboRogue from JPL, with a resolution of 50 meters or better. Command and control was via two 80C186 processors. On-board storage of 13 hours of science data was possible. The S-Band communications with a maximum data rate of 256 kbps used cross-dipole antennas.

The Overhauser proton-precession magnetometer measured the scalar values of the magnetic field with a resolution of < 1 nT. A CSC fluxgate magnetometer measured the vector values of the magnetic field with a resolution of < 3-5 nT. Six particle detectors measured high-energy charged particles: electrons (30 KeV to 1 MeV), protons (200 KeV to 30 MeV), and alpha-particles (1 to 100 MeV). The Star Imager determined the absolute attitude of the CSC fluxgate magnetometer with a resolution of < 20 arc-seconds. A GPS TurboRogue dual frequency receiver, with a position accuracy of 5-10 cm, allowed occultation measurements to determine temperature and electron density properties. The two magnetometers and the star imager were placed on an 8 meter deployable boom. The particle detectors and the GPS TurboRogue were mounted on the main spacecraft.

The spacecraft was named after the Danish physicist Hans Christian Ørsted who discovered electromagnetism in 1820.

Gross mass: 62 kg (136 lb).
Height: 8.00 m (26.20 ft).
First Launch: 1999.02.23.
Number: 1 .

More... - Chronology...

Associated Countries
See also
  • Delta The Delta launch vehicle was America's longest-lived, most reliable, and lowest-cost space launch vehicle. Development began in 1955 and it continued in service in the 21st Century despite numerous candidate replacements. More...

Associated Launch Vehicles
  • Delta American orbital launch vehicle. The Delta launch vehicle was America's longest-lived, most reliable, and lowest-cost space launch vehicle. Delta began as Thor, a crash December 1955 program to produce an intermediate range ballistic missile using existing components, which flew thirteen months after go-ahead. Fifteen months after that, a space launch version flew, using an existing upper stage. The addition of solid rocket boosters allowed the Thor core and Able/Delta upper stages to be stretched. Costs were kept down by using first and second-stage rocket engines surplus to the Apollo program in the 1970's. Continuous introduction of new 'existing' technology over the years resulted in an incredible evolution - the payload into a geosynchronous transfer orbit increasing from 68 kg in 1962 to 3810 kg by 2002. Delta survived innumerable attempts to kill the program and replace it with 'more rationale' alternatives. By 2008 nearly 1,000 boosters had flown over a fifty-year career, and cancellation was again announced. More...
  • Delta 2 7000 American orbital launch vehicle. The Delta 7000 series used GEM-40 strap-ons with the Extra Extended Long Tank core, further upgraded with the RS-27A engine. More...
  • Delta 7920-X Three stage vehicle consisting of 9 x GEM-40 + 1 x EELT Thor/RS-27A + 1 x Delta K with 3.05 m (10 foot) diameter fairing More...

Associated Manufacturers and Agencies
  • CRI Danish manufacturer of spacecraft. Computer Resources International, Copenhagen, Denmark. More...

  • McDowell, Jonathan, Jonathan's Space Home Page (launch records), Harvard University, 1997-present. Web Address when accessed: here.
  • JPL Mission and Spacecraft Library, Jet Propulsion Laboratory, 1997. Web Address when accessed: here.

Associated Launch Sites
  • Vandenberg Vandenberg Air Force Base is located on the Central Coast of California about 240 km northwest of Los Angeles. It is used for launches of unmanned government and commercial satellites into polar orbit and intercontinental ballistic missile test launches toward the Kwajalein Atoll. More...
  • Vandenberg SLC2W Delta launch complex. Originally a Thor 75 SMS launch pad. Upgraded to a space launch complex in 1966. More...

Orsted Chronology

1999 February 23 - . 10:29 GMT - . Launch Site: Vandenberg. Launch Complex: Vandenberg SLC2W. LV Family: Delta. Launch Vehicle: Delta 7920-X. LV Configuration: Delta 7920-10 D267.
  • Orsted - . Mass: 62 kg (136 lb). Nation: Denmark. Agency: DMI. Manufacturer: CRI. Class: Earth. Type: Magnetosphere satellite. Spacecraft: Orsted. USAF Sat Cat: 25635 . COSPAR: 1999-008B. Apogee: 839 km (521 mi). Perigee: 638 km (396 mi). Inclination: 96.5000 deg. Period: 99.60 min. Summary: Denmark's Orsted gravity gradient stabilised satellite was to map the Earth's magnetic field. It was managed and operated by the Danish Meteorological Institute in Copenhagen. The satellite's prime contractor was CRI , Copenhagen..

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