| definition
| - The Nimbus 7 research-and-development satellite served as a
stabilized, earth-oriented platform for the testing of advanced
systems for sensing and collecting data in the pollution,
oceanographic and meteorological disciplines. The polar-orbiting
spacecraft consisted of three major structures: (1) a hollow
torus-shaped sensor mount, (2) solar paddles, and (3) a control
housing unit that was connected to the sensor mount by a tripod truss
structure. Configured somewhat like an ocean buoy, Nimbus-7 was
nearly 3.04 m tall, 1.52 m in diameter at the base, and about 3.96 m
wide with solar paddles extended. The sensor mount that formed the
satellite base housed the electronics equipment and battery modules.
The lower surface of the torus provided mounting space for sensors and
antennas. A box-beam structure mounted within the center of the torus
provided support for the larger sensor experiments. Mounted on the
control housing unit, which was located on top of the spacecraft, were
sun sensors, horizon scanners, and a command antenna. The spacecraft
spin axis was pointed at the earth. An advanced attitude-control
system permitted the spacecraft's orientation to be controlled to
within plus or minus 1 deg in all three axes (pitch, roll, and yaw).
Eight experiments were selected: (1) Limb Infrared Monitoring of the
Stratosphere (LIMS), (2) Stratospheric And Mesopheric Sounder (SAMS),
(3) Coastal-Zone Color Scanner (CZCS), (4) Stratospheric Aerosol
Measurement II (SAM II), (5) Earth Radiation Budget (ERB), (6)
Scanning Multichannel Microwave Radiometer (SMMR), (7) Solar
Backscatter UV and Total Ozone Mapping Spectrometer (SBUV/TOMS), and
(8) Temperature-Humidity Infrared Radiometer (THIR). These sensors
were capable of observing several parameters at and below the
mesospheric levels. The Nimbus-7 spacecraft was turned off in 1994
after 16 years of service.
Group: Platform_Details
Entry_ID: NIMBUS-7
Group: Platform_Identification
Platform_Category: Earth Observation Satellites
Platform_Series_or_Entity: NIMBUS
Short_Name: NIMBUS-7
End_Group
Group: Synonymous_Platform_Names
Short_Name: Nimbus-G
End_Group
Group: Platform_Associated_Instruments
Short_Name: CZCS
Short_Name: TOMS
Short_Name: SBUV
Short_Name: LIMS
Short_Name: THIR
Short_Name: SAMS
Short_Name: SMMR
Short_Name: ERB
End_Group
Group: Orbit
Orbit_Altitude: 955 km
Orbit_Inclination: 99.1 degree
Equator_Crossing: 12:00 PM for ascending and 12:00 AM for descending
Period: 104.15 min.
Repeat_Cycle: 6 days
End_Group
Creation_Date: 2007-10-17
Online_Resource: http://nssdc.gsfc.nasa.gov/database/MasterCatalog?sc=1978-098A
Online_Resource: http://nasascience.nasa.gov/missions/nimbus
Sample_Image: http://toms.gsfc.nasa.gov/n7toms/images/n7c100small.gif
Group: Platform_Logistics
Launch_Date: 1978-10-24
Launch_Site: Vandenberg Air Force Base, USA
Primary_Sponsor: USA/NASA
End_Group
End_Group (en)
|
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