Editing Pioneer 11 (section)

===Spacecraft design===
The ''Pioneer 11'' bus measures {{convert|36|cm|in|sp=us}} deep and with six {{convert|76|cm|in|sp=us|adj=mid|-long}} panels forming the hexagonal structure. The bus houses propellant to control the orientation of the probe and eight of the twelve scientific instruments. The spacecraft has a mass of 259&nbsp;kilograms.{{sfn|Fimmel|Swindell|Burgess|1974|p=42}}

====Attitude control and propulsion====
:Orientation of the spacecraft was maintained with six 4.5-[[Newton (unit)|N]],{{r|Astronautix}} [[hydrazine]] [[monopropellant rocket|monopropellant]] thrusters: pair one maintains a constant spin-rate of 4.8 [[Revolutions per minute|rpm]], pair two controls the forward thrust, pair three controls attitude. Information for the orientation is provided by performing [[conical scanning]] maneuvers to track Earth in its orbit,{{r|weebau1}} a [[Star tracker#Star tracker|star sensor]] able to reference [[Canopus]], and two [[Sun sensor]]s.{{sfn|Fimmel|Swindell|Burgess|1974|pp=42–43}}

====Communications====
:The space probe includes a redundant system [[transceiver]]s, one attached to the [[Directional antenna|high-gain antenna]], the other to an omni-antenna and medium-gain antenna. Each transceiver is 8 watts and transmits data across the [[S band|S-band]] using 2110 MHz for the uplink from Earth and 2292 MHz for the downlink to Earth with the [[Deep Space Network]] tracking the signal. Prior to transmitting data, the probe uses a [[convolutional code|convolutional encoder]] to allow [[error correction|correction of errors]] in the received data on Earth.{{sfn|Fimmel|Swindell|Burgess|1974|p=43}}

====Power====
[[File:NASM-NASM2016-00091.jpg|thumb|SNAP-19 RTG on a ''Pioneer 10/11'' replica]]
:''Pioneer 11'' uses four SNAP-19 [[radioisotope thermoelectric generator]]s (RTGs) ('''''[[:File:Cutdrawing of an SNAP 19 RTG.jpg|see diagram]]'''''). They are positioned on two three-rod trusses, each {{cvt|3|m|ftin}} in length and 120 degrees apart. This was expected to be a safe distance from the sensitive scientific experiments carried on board. Combined, the RTGs provided 155 watts at launch, and decayed to 140 W in transit to Jupiter. The spacecraft requires 100 W to power all systems.{{sfn|Fimmel|Swindell|Burgess|1974|pp=44–45}}

====Computer====
:Much of the computation for the mission was performed on Earth and transmitted to the probe, where it is able to retain in memory, up to five commands of the 222 possible entries by ground controllers. The spacecraft includes two command decoders and a command distribution unit, a very limited form of a processor, to direct operations on the spacecraft. This system requires that mission operators prepare commands long in advance of transmitting them to the probe. A data storage unit is included to record up to 6,144 [[bytes]] of information gathered by the instruments. The digital telemetry unit is then used to prepare the collected data in one of the thirteen possible formats before transmitting it back to Earth.{{sfn|Fimmel|Swindell|Burgess|1974|p=38}}

====Scientific instruments====
''Pioneer 11'' has one additional instrument more than ''Pioneer 10'', a flux-gate magnetometer.{{r|solarviews1}}
{| class="wikitable"
|-
! colspan="2" style="text-align: left"  | Helium Vector [[Magnetometer]] ('''HVM''')
|-
| [[File:Pioneer 10-11 - P50 - fx.jpg|150px]]
|Measures the fine structure of the interplanetary magnetic field, mapped the Jovian magnetic field, and provides magnetic field measurements to evaluate solar wind interaction with Jupiter.<ref name=nssdc2/>
* {{small|'''Principal investigator:''' Edward Smith / JPL}}
* {{small|1='''Data:''' [http://pds-ppi.igpp.ucla.edu/search/?filter=PN_5001,PN_6001&title=Pioneer_11_Helium_Vector_Magnetometer PDS/PPI data catalog], [ftp://nssdcftp.gsfc.nasa.gov/spacecraft_data/pioneer/pioneer11/mag/ NSSDC data archive]}}
|-
! colspan="2" style="text-align: left"  | Quadrispherical [[Plasma (physics)|Plasma]] Analyzer
|-
| [[File:Pioneer 10-11 - P51b - fx.jpg|150px]]
|Peer through a hole in the large dish-shaped antenna to detect particles of the solar wind originating from the Sun.<ref name=nssdc3/>
* {{small|'''Principal investigator:''' Aaron Barnes / NASA Ames Research Center ([https://web.archive.org/web/20000520044455/http://arwen.arc.nasa.gov/ archived website])}}{{sfn|Simpson|2001|p=146}}
* {{small|1='''Data:''' [http://pds-ppi.igpp.ucla.edu/search/?filter=PN_5001,PN_6001&title=Pioneer_11_Quadrispherical_Plasma_Analyser PDS/PPI data catalog], [ftp://nssdcftp.gsfc.nasa.gov/spacecraft_data/pioneer/pioneer11/plasma/ NSSDC data archive]}}
|-
! colspan="2" style="text-align: left"  | [[Charged particle|Charged Particle]] Instrument ('''CPI''')
|-
| [[File:Pioneer 10-11 - P52a - fx.jpg|150px]]
|Detects cosmic rays in the Solar System.<ref name=nssdc4/>
* {{small|'''Principal investigator:''' [[John Alexander Simpson|John Simpson]] / University of Chicago}}{{sfn|Simpson|2001|p=146}}
* {{small|'''Data:''' [ftp://nssdcftp.gsfc.nasa.gov/spacecraft_data/pioneer/pioneer11/particle/cpi/ NSSDC data archive]}}
|-
! colspan="2" style="text-align: left"  | [[Cosmic Ray]] Telescope ('''CRT''')
|-
| [[File:Pioneer 10-11 - P52b - fx.jpg|150px]]
|Collects data on the composition of the cosmic ray particles and their energy ranges.{{r|nssdc5}}
* {{small|'''Principal investigator:''' [[Frank B. McDonald]] / NASA Goddard Space Flight Center}}{{sfn|Simpson|2001|p=146}}
* {{small|1='''Data:''' [http://pds-ppi.igpp.ucla.edu/search/?filter=PN_5001,PN_6001&title=Pioneer_11_Cosmic_Ray_Telescope PDS/PPI data catalog], [ftp://nssdcftp.gsfc.nasa.gov/spacecraft_data/pioneer/pioneer11/particle/crt/ NSSDC data archive]}}
|-
! colspan="2" style="text-align: left"  | [[Geiger tube telescope|Geiger Tube Telescope]] ('''GTT''')
|-
| {{center|[[File:Pioneer 10-11 - p53 - fx.jpg|x100px]]}}
|Surveys the intensities, energy spectra, and angular distributions of electrons and protons along the spacecraft's path through the radiation belts of Jupiter and Saturn.{{r|nssdc6}}
* {{small|'''Principal investigator:''' [[James A. Van Allen]] / University of Iowa ([http://www-pw.physics.uiowa.edu/pioneer/home.html website])}}{{sfn|Simpson|2001|p=146}}
* {{small|1='''Data:''' [http://pds-ppi.igpp.ucla.edu/search/?filter=PN_5001,PN_6001&title=Pioneer_11_Gieger_Tube_Telescope PDS/PPI data catalog], [ftp://nssdcftp.gsfc.nasa.gov/spacecraft_data/pioneer/pioneer11/particle/gtt/ NSSDC data archive], [ftp://nssdcftp.gsfc.nasa.gov/spacecraft_data/pioneer/pioneer11/geiger_tube_telescope_%28gtt%29/jupiter_encounter_data/ NSSDC Jupiter data archive]}}
|-
! colspan="2" style="text-align: left"  | Trapped [[Radiation]] Detector ('''TRD''')
|-
| [[File:Pioneer 10-11 - P54 - fx.jpg|150px]]
|
Includes an ''unfocused [[Cherenkov detector|Cerenkov counter]]'' that detects the light emitted in a particular direction as particles passed through it recording electrons of energy, 0.5 to 12 [[electronvolt|MeV]], an ''electron scatter detector'' for electrons of energy, 100 to 400 keV, and a ''minimum ionizing detector'' consisting of a solid-state diode that measured minimum ionizing particles (<3 MeV)  and protons in the range of 50 to 350 MeV.{{r|nssdc7}}
* {{small|'''Principal investigator:''' R. Fillius / University of California San Diego}}{{sfn|Simpson|2001|p=146}}
* {{small|'''Data:''' [ftp://nssdcftp.gsfc.nasa.gov/spacecraft_data/pioneer/pioneer11/particle/trd/ NSSDC hourly data archive], [ftp://nssdcftp.gsfc.nasa.gov/spacecraft_data/pioneer/pioneer11/jovian_trapped_radiation/saturn_enctr_binary_reduction_dat/ NSSDC Saturn data archive]}}
|-
! colspan="2" style="text-align: left"  | [[Meteoroid]] Detectors
|-
| [[File:Pioneer 10-11 - P56 - fx.jpg|150px]]
|Twelve panels of pressurized cell detectors mounted on the back of the main dish antenna record penetrating impacts of small meteoroids.{{r|nssdc8}}
* {{small|'''Principal investigator:''' William Kinard / NASA Langley Research Center}}{{sfn|Simpson|2001|p=146}}
* {{small|1='''Data:''' [http://nssdc.gsfc.nasa.gov/nmc/datasetSearch.do?spacecraft=Pioneer%2011&experiment=Meteoroid%20Detectors NSSDC data archive list]}}
|-
! colspan="2" style="text-align: left"  | Asteroid/Meteoroid Detector ('''AMD''')
|-
| [[File:Pioneer 10-11 - P55b - fx.jpg|150px]]
|Meteoroid-asteroid detector looks into space with four non-imaging telescopes to track particles ranging from close by bits of dust to distant large asteroids.{{r|nssdc9}}
* {{small|'''Principal investigator:''' Robert Soberman / General Electric Company}}{{sfn|Simpson|2001|p=146}}
* {{small|1='''Data:''' [http://nssdc.gsfc.nasa.gov/nmc/datasetSearch.do?spacecraft=Pioneer%2011&experiment=Asteroid/Meteoroid%20Astronomy NSSDC data archive list]}}
|-
! colspan="2" style="text-align: left"  | Ultraviolet [[Photometer]]
|-
| [[File:Pioneer 10-11 - P57a - fx.jpg|150px]]
|Ultraviolet light (200 to 800 [[Angstrom|Å]]) is sensed to determine the quantities of hydrogen and helium in space and on Jupiter and Saturn.{{r|nssdc10}}
* {{small|'''Principal investigator:''' [[Darrell Lynn Judge|Darrell Judge]] / University of Southern California}}{{sfn|Simpson|2001|p=146}}
* {{small|1='''Data:''' [http://ppi.pds.nasa.gov/search?filter=PN_5001,PN_6001&title=Pioneer_11_Ultraviolet_Photometer PDS/PPI data catalog], [ftp://nssdcftp.gsfc.nasa.gov/spacecraft_data/pioneer/pioneer11/uv/ NSSDC data archive]}}
|-
! colspan="2" style="text-align: left"  | Imaging [[Polarimeter|Photopolarimeter]] ('''IPP''')
|-
| [[File:Pioneer 10-11 - P60 - fx.jpg|150px]]
|The imaging experiment relies upon the spin of the spacecraft to sweep a small telescope across the planet in narrow strips only 0.03 degrees wide, looking at the planet in red (5800 to 7000 [[Angstrom|Å]]) and blue (3900 to 4900 Å) light. These strips are then processed to build up a visual image of the planet.{{r|nssdc11}}
* {{small|'''Principal investigator:''' [[Tom Gehrels]] / University of Arizona}}{{sfn|Simpson|2001|p=146}}
* {{small|1='''Data:''' [http://nssdc.gsfc.nasa.gov/nmc/datasetSearch.do?spacecraft=Pioneer%2011&experiment=Imaging%20Photopolarimeter%20%28IPP%29 NSSDC data archive list]}}
|-
! colspan="2" style="text-align: left"  | Infrared [[Radiometer]]
|-
| [[File:P58 - fx.jpg|150px]]
|Provides information on cloud temperature and the output of heat from Jupiter and Saturn.{{r|nssdc12}}
* {{small|'''Principal investigator:''' [[Andrew Ingersoll]] / California Institute of Technology}}{{sfn|Simpson|2001|p=146}}
|-
! colspan="2" style="text-align: left"  | Triaxial Fluxgate [[Magnetometer]]
|-
| [[File:Triaxial Fluxgate Mars Global Surveyor Magnetometer.gif|150px]]
|Measures the magnetic fields of both Jupiter and Saturn. This instrument is not carried on ''Pioneer 10''.{{r|nssdc13}}
* {{small|'''Principal investigator:''' [[Mario Acuna]] / NASA Goddard Space Flight Center}}
* {{small|1='''Data:''' [http://nssdc.gsfc.nasa.gov/nmc/datasetSearch.do?spacecraft=Pioneer%2011&experiment=Jovian%20Magnetic%20Field NSSDC data archive list]}}
|}