JunoCam
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JunoCam (or JCM) is the visible-light camera/telescope onboard NASA's ''Juno'' spacecraft that entered orbit around
Jupiter Jupiter is the fifth planet from the Sun and the List of Solar System objects by size, largest in the Solar System. It is a gas giant with a Jupiter mass, mass more than 2.5 times that of all the other planets in the Solar System combined a ...
in 2016. The camera is operated by the JunoCam Digital Electronics Assembly (JDEA). Both the camera and JDEA were built by Malin Space Science Systems. JunoCam takes a swath of imaging as the spacecraft rotates; the camera is fixed to the spacecraft, so as it rotates, it gets one sweep of observation. It has a field of view of 58 degrees with four filters (3 for visible light).


Planned goals and outcome

Originally, due to telecommunications constraints, ''Juno'' was expected to only be able to return about 40 megabytes of camera data during each 11-day orbital period (the orbital period was later modified). The downlink average data rate of around 325 bits per second will limit the number of images that are captured and transmitted during each orbit to somewhere between 10 and 100 depending on the compression level used.''Junocam will get us great global shots down onto Jupiter's poles'' (The Planetary Society)
/ref> This is comparable to the previous ''Galileo'' mission that orbited Jupiter, which captured thousands of imagesGalileo Legacy Site Image Gallery (NASA)
/ref> despite its slow data rate of 1000 bits per second (at maximum compression levels) due to antenna problems that prevented operation with its planned 135,000 bit-per-second communications link. The primary observation target is Jupiter itself, although limited images of some of Jupiter's moons have been taken and more are intended. JunoCam successfully returned detailed images of Ganymede after ''Juno's'' flyby on June 7, 2021, with further opportunities including planned flybys of Europa on September 29, 2022, and two of Io scheduled for December 30, 2023 and February 3, 2024. These flybys will also reduce Juno's orbital period to 33 days. The JunoCam project is led by
Candice Hansen-Koharcheck Candice Joy Hansen-Koharcheck is a planetary scientist. She is responsible for the development and operation of the JunoCam, for which she received the NASA Outstanding Public Leadership Medal in 2018. Education and career Hansen received her Ba ...
. JunoCam is not one of the probe's core scientific instruments; it was put on board primarily for public science and outreach, to increase public engagement, with all images available on NASA's website. It is capable of being used for science, and does have some coordinated activities in regards to this, as well as to engage amateur and as well as professional infrared astronomers.


Design

The JunoCam physical and electronic interfaces are largely based on the MARDI instrument for the
Mars Science Laboratory Mars Science Laboratory (MSL) is a robotic spacecraft, robotic space probe mission to Mars launched by NASA on November 26, 2011, which successfully landed ''Curiosity (rover), Curiosity'', a Mars rover, in Gale (crater), Gale Crater on Augus ...
. However, the housing and some aspects of the camera's inner mechanism have been modified to provide stable operation in Jupiter's intense radiation environment and magnetic fields. Part of its mission will be to provide close up views of Jupiter's polar region and lower-latitude cloud belts, and at ''Juno''s intended orbit the camera is able to take images at up to per pixel resolution. However, within one hour of closest approach to Jupiter it can take up to pixel, thus exceeding the resolution of ''Cassini'' up to that time on Saturn. In addition to visible light filters, it also has a near infrared filter to help detect clouds; a methane filter in addition the visible color filters. The camera is a "push-broom" type imager, generating an image as the spacecraft turns moving the sensor in sweeping motion over the observation area. One of the constraints for JunoCam hardware was mass, which limited the size of the optics.


Specifications and mission

The camera and the mission were not designed to study the
moons of Jupiter There are 97 Natural satellite, moons of Jupiter with confirmed orbits . This number does not include a number of meter-sized moonlets thought to be shed from the inner moons, nor hundreds of possible kilometer-sized outer irregular moons that ...
. JunoCam has a field of view that is too wide to resolve any detail in the Jovian moons except during close flybys. Jupiter itself may only appear to be 75 pixels across from JunoCam when Juno reaches the furthest point of its orbit around the planet. At its closest approaches, JunoCam could achieve 15 km/pixel resolution from 4300 km, while Hubble has taken images of up to 119 km/pixel from 600 million km. The camera uses a
Kodak The Eastman Kodak Company, referred to simply as Kodak (), is an American public company that produces various products related to its historic basis in film photography. The company is headquartered in Rochester, New York, and is incorporated i ...
image sensor, the KODAK KAI-2020, capable of color imaging at 1600 x 1200 pixels: less than 2 megapixels. It has a field of view of 58 degrees with four filters (red, green, blue, and a methane band) to provide color imaging.JunoCam: Juno's Outreach Camera (PDF)
/ref> The low resolution, rigid mounting, and
lossy compression In information technology, lossy compression or irreversible compression is the class of data compression methods that uses inexact approximations and partial data discarding to represent the content. These techniques are used to reduce data size ...
applied before transmission makes it effectively the ''Juno'' "
dashcam A dashboard camera or simply dashcam, also known as car digital video recorder (car DVR), driving recorder, or event data recorder (EDR), is an onboard camera that continuously records the view through a vehicle's front windscreen and somet ...
". ''Juno''s orbit is highly elongated and takes it close to the poles (within ), but then far beyond
Callisto CALLISTO (''Cooperative Action Leading to Launcher Innovation in Stage Toss-back Operations'') is a reusable VTVL Prototype, demonstrator propelled by a small 40 kN Japanese LOX-LH2 rocket engine. It is being developed jointly by the CNES, French ...
's orbit, the most distant Galilean moon. This orbital design helps the spacecraft (and its complement of scientific instruments) avoid Jupiter's radiation belts, which have a record of damaging spacecraft electronics and solar panels. The Juno Radiation Vault with its
titanium Titanium is a chemical element; it has symbol Ti and atomic number 22. Found in nature only as an oxide, it can be reduced to produce a lustrous transition metal with a silver color, low density, and high strength, resistant to corrosion in ...
walls also aids in protecting and shielding Juno's electronics. Despite the intense
magnetosphere of Jupiter The magnetosphere of Jupiter is the cavity created in the solar wind by Jupiter's magnetic field. Extending up to seven million kilometers in the Sun's direction and almost to the orbit of Saturn in the opposite direction, Jupiter's magnetospher ...
, JunoCam was expected to be operational for at least the first eight orbits (September 2017), but as of December 2023 (57 orbits) remains active and has also been re-purposed from an outreach-only camera to a scientific instrument to study the dynamics of Jupiter's clouds, polar storms, and moons. The camera sensor experienced noticeable damage from radiation during the 56th orbit in late 2023, increasing noise in the resulting images. However, there is still enough detail to produce sharp imagery through more intensive processing.


Additional camera proposal

In 2005 the
Italian Space Agency The Italian Space Agency (; ASI) is a government agency established in 1988 to fund, regulate and coordinate space exploration activities in Italy. The agency cooperates with numerous national and international entities who are active in aerospac ...
(ASI) proposed an additional visible light instrument "ItaCam", but instead they built a near-infrared camera/spectrometer, the
Jovian Infrared Auroral Mapper Jovian Infrared Auroral Mapper (JIRAM) is an instrument on the Juno (spacecraft), ''Juno'' spacecraft in orbit of the planet Jupiter. It is an image spectrometer and was contributed by Italy. Similar instruments are on ESA ''Rosetta (spacecraft) ...
(JIRAM) and a Ka-band transponder. ASI previously contributed a near-infrared instrument to the ''
Cassini–Huygens ''Cassini–Huygens'' ( ), commonly called ''Cassini'', was a space research, space-research mission by NASA, the European Space Agency (ESA), and the Italian Space Agency (ASI) to send a space probe to study the planet Saturn and its system, i ...
'' Saturn probe. The Ka-band instrument, ''KaTS'', is a component of the Gravity Science experiment.Bruce Moomaw, "Juno Gets A Little Bigger With One More Payload For Jovian Delivery", 2007
/ref>


Gallery

;Earth File:Southern Atlantic and Antarctica from Juno flyby - October 9, 2013.jpg, A color view of Earth assembled from 82 images as the spacecraft spun, at an altitude of 1,987 miles (3,197 kilometers), 10 minutes before closest approach File:Junoearthflyby.jpg, JunoCam views Earth (centered on South America) in October 2013 during the spacecraft's flyby en route to Jupiter ;Jupiter system File:PIA21032 Jupiter Down Under.jpg, Jupiter's polar region captured by JunoCam. File:PIA21641-Jupiter-SouthernStorms-JunoCam-20170525.jpg, Jupiter – southern storms – viewed by JunoCam. File:Pioneer 11 - Jupiter - p176.jpg, Jupiter's polar region in 1974 during ''
Pioneer 11 ''Pioneer 11'' (also known as ''Pioneer G'') is a NASA robotic space probe launched on April 5, 1973, to study the asteroid belt, the environment around Jupiter and Saturn, the solar wind, and cosmic rays. It was the first probe to Exploration ...
''s
gravity assist A gravity assist, gravity assist maneuver, swing-by, or generally a gravitational slingshot in orbital mechanics, is a type of spaceflight flyby (spaceflight), flyby which makes use of the relative movement (e.g. orbit around the Sun) and gra ...
to Saturn. (Historical background for Jupiter imaging) File:PIA24681-1041-Ganymede-JupiterMoon-Juno-20210607.jpg, upGanymede, photographed on by ''Juno'' during its extended mission
;Io, moon File:Io seen by JunoCam.png, Io, as recorded by JunoCam
(2 September 2017) File:PIA26234-JupiterMoonIo-Volcanos-20231015.jpg, Io, viewed by JunoCam
(15 October 2023)
Several Volcanos File:PIA26235-JupiterMoonIo-Plume-20231015.jpg, Io, viewed by JunoCam
(15 October 2023)
Volcanic plume


See also

*
Citizen science The term citizen science (synonymous to terms like community science, crowd science, crowd-sourced science, civic science, participatory monitoring, or volunteer monitoring) is research conducted with participation from the general public, or am ...
* ''Galileo'' (spacecraft), NASA space probe to Jupiter 1989–2003. Other cameras manufactured by Malin Space Science Systems: * Context (CTX) Camera also for the MRO spacecraft * Mars Color Imager for the
Mars Reconnaissance Orbiter The ''Mars Reconnaissance Orbiter'' (''MRO'') is a spacecraft designed to search for the existence of water on Mars and provide support for missions to Mars, as part of NASA's Mars Exploration Program. It was launched from Cape Canaveral on Au ...
(MRO) *
Mars Orbiter Camera The Mars Orbiter Camera and Mars Observer Camera (MOC) were scientific instruments on board the Mars Observer and Mars Global Surveyor spacecraft. The camera was built by Malin Space Science Systems (MSSS) for NASA and the cost of the whole MOC ...
Other ''Juno'' instruments: *
JEDI Jedi (), Jedi Knights, or collectively the Jedi Order are fictional characters, and often protagonists, featured in many works within the '' Star Wars'' franchise. Working symbiotically alongside the Galactic Republic, the Jedi Order is depic ...
* Jovian Auroral Distributions Experiment (JADE) *
Jovian Infrared Auroral Mapper Jovian Infrared Auroral Mapper (JIRAM) is an instrument on the Juno (spacecraft), ''Juno'' spacecraft in orbit of the planet Jupiter. It is an image spectrometer and was contributed by Italy. Similar instruments are on ESA ''Rosetta (spacecraft) ...
(JIRAM) * Magnetometer (Juno) (MAG)


References


External links


MSSS JunoCam for ''Juno'' Jupiter Orbiter

Big Dipper (Ursa Major) by JunoCam

Earth flyby pics
(B&W and color)

(raw)
Earth flyby pic
(B&W)
JunoCam image release galleryLittle Red Spot by JunoCam (Jan 26, 2017 release from Dec flyby)Series of images of the GRS by JunoCam
{{Junojupiternav Space imagers Space telescopes Juno (spacecraft)