JUNO - Atlas V 551 - Canaveral SLC-41 - 05.08.2011

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Команда готовится к пролету Земли.
Выложили симуляцию фото Земли с близкой дистанции.

http://www.unmannedspaceflight.com/index.php?showtopic=2548&view=findpost&p=201943

[frigate]

JUNO The journey to Jupiter All About Space UK Magazine N7 2012 page 32-35

[Space Alien]

Американский зонд "Джуно" преодолел половину пути к Юпитеру

Зонд НАСА "Джуно" пролетел половину своего пути к Юпитеру, на орбиту которого он должен выйти в 2016 году, говорится в сообщении американского космического агентства.

В понедельник, в 16:25 мск одометр зонда зафиксировал, что "Джуно" пролетел с момента старта 9,46 астрономической единицы, или примерно 1,42 миллиарда километров. В этот момент аппарат находился в 55,46 миллиона километров от Земли.

РИА Новости http://ria.ru/science/20130813/955961390.html

[Space Alien]

NASA's Juno is Halfway to Jupiter


http://www.nasa.gov/mission_pages/juno/news/juno20130812.html

[che wi]

.

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Подробная информация о пролете Земли

Juno Earth Flyby - Oct. 9, 2013



http://www.nasa.gov/mission_pages/juno/earthflyby.html

[che wi]

Juno Spacecraft set for Critical Earth Flyby on Wednesday
http://www.spaceflight101.com/juno-mission-updates-2013.html

NASA's Juno Spacecraft is gearing up for its crucial Gravity-Assist Flyby of Earth that will occur on Wednesday and boost the vehicle's velocity to allow it to reach Jupiter in 2016.

After being launched atop an Atlas V 551 rocket from Cape Canaveral Air Force Station on August 5, 2011, Juno was ins erted in to a heliocentric orbit with a period of a little more than two years. This orbit took Juno through the inner Solar System before crossing the orbit of Mars on its way to aphelion at 2.26 astronomical units. Around the time of aphelion, Juno used its main propulsion system on August 30, 2012 and September 14, 2012 to perform two major Deep Space Maneuvers to modify its orbit for the trip back into the inner Solar System for the Earth Flyby.

In April 2013, Juno once again crossed the orbit of Mars on its way back to Earth. The vehicle performed Trajectory Correction Maneuvers in 2013 to precisely target its Flyby position, crossing the orbit of Earth and passing perihelion at 0.88 astronomical units on August 31. After that, the vehicle was approaching Earth from interior to its orbit.



The Gravity Assist Flyby on October 9 supplies Juno with a delta-v (Velocity Change) of 7.3 Kilometers per second (26,280kph, 16,330mph). With this additional velocity, Juno's Orbit around the Sun is modified in a way that takes the vehicle's aphelion outside Jupiter's Orbit - crossing its orbit at the correct time to intercept the planet on July 5, 2016 and ins ert itself in to orbit. [For reference, the two Deep Space Maneuvers provided a delta-v of 732m/s - about 10% of the Flyby delta-v. Overall, the EFB boosts Juno's velocity by 70%]

As part of its Flyby, Juno will come as close as 559 Kilometers to Earth at perigee with closest approach occurring at 19:21 UTC on Wednesday above the South Atlantic Ocean, about 200 Kilometers from the southeastern coast of South Africa.

The primary objective of the Flyby is obviously to put Juno onto the right path to reach Jupiter, but the event also provides a valuable opportunity for science operations and technical demonstrations, making the Flyby a highly complex sequence of activities.

Flyby operations are already in full swing as the Juno spacecraft and other spacecraft that will perform coordinated observations are being prepared. Despite the US Federal Government Shutdown, essential operations - like the Juno Flyby - are still being supported and other mission operations centers at institutions like Caltech and the Applied Physics Lab at JHU are still operating.

Спойлер

In the days and weeks leading up to the Flyby, teams made sure the way was clear for Juno, cross-checking the database of Earth orbiting satellites and natural near-Earth objects to make sure none would interfere with Juno's flight path.

The Juno team is planned to rehearse an 11-day Jupiter Science Orbit centered around the Flyby, operating Juno's instruments, gathering data and processing it to verify the Jovian data collection style in order to be ready for operations at Jupiter. Flying past Earth, Juno and its instruments will be in a well known magnetospheric environment - presenting a good calibration opportunity.

For the Flyby, Juno's JADE (Jovian Auroral Distribution Experiment) and the MWR (Microwave Radiometer) instruments will be deactivated while all other instruments will be actively gathering data.

The UVS - Ultraviolet Imaging Spectrograph - was planned to be activated four and a half days before the Flyby. Five hours before closest approach, the instrument will start taking data, observing the Moon to acquire sensitivity data at extreme ultraviolet wavelengths using reflected sunlight. This data will be compared with data provided by the Lunar Reconnaissance Orbiter for instrument characterization. UVS will then observe the Earth starting 20 minutes before closest approach to acquire UV spectra of the Airglow phenomenon that is caused by ultraviolet radiation exciting gas molecules in the upper portion of the atmosphere leading to an orange/gold glow.

As Juno passes Earth, UVS will also look at the southern auroral region. After closest approach, the UVS Door will be closed for dark observations in the radiation environment of Earth to characterize instrument shielding and radiation effects.

Three days ahead of the Flyby, the JEDI (Jupiter Energetic Particle Detector Instrument) was to be activated. As Juno passes through Earth's radiation belt, the spacecraft will encounter energetic particles similar to those it will be detecting at Jupiter. Acquiring JEDI data in an environment that is well understood and can be measured by other spacecraft will give scientists good baseline data to help understand JEDI data obtained during the science mission. The Flyby will allow JEDI to practice a Jupiter Orbit scenario, testing how well the instrument can capture data in a fast changing environment and checking the instrument's response to energetic ions.

The Waves instrument was also planned to become active three days ahead of the Flyby. It will be operated in a science-orbit like manner to gather as much information on instrument functionality and performance of the solar array noise cancellation algorithm. Waves will also detect man-made radio transmissions as evidence for an inhabited Earth.
Science Instruments

The JunoCam instrument, Juno's educational instrument that will capture images in visible light will become active about 8 hours ahead of closest approach. Around 7 hours before the Flyby, JunoCam will start taking a series of photos of the Moon, however, the spacecraft will be fairly far from the Moon which will be very small in the images as a result. With Juno inbound over the dayside of Earth, JunoCam will take a number of images over a 20-minute period to see South America and the Atlantic Ocean.

Over the night side of Earth, JunoCam will take three images of South Africa and its surroundings to try and capture the lights of major cities in South Africa and the islands of Madagascar, Mauritius and Reunion. After that, JunoCam will take dark images to provide calibration data for noise and radiation effects. A total of 17 images will be taken by the instrument. JunoCam data will be made public. (Initially, images were expected shortly after the Flyby but the Government Shutdown might cause a delay in image distribution.)

Finally, the JIRAM (Jovian Infrared Auroral Mapper) instrument will be activated six hours ahead of the Flyby to acquire calibration data as part of observations of the Moon. The instrument will acquire 60 images and spectra of the Moon during a 33-minute sequence to provide teams with calibration data of a very well known target.

A number of other spacecraft will be performing coordinated observations during the Flyby. Detailed particle and radiation data and the current state of Earth's radiation belts will be provided by the Van Allen Probe twins that will be in a favorable position at the time of the Flyby. Also, the THEMIS mission (Time History of Events and Macroscale Interactions during Substorms) will provide precise measurements of electric fields, energetic ions and energetic electrons to help characterize data collected by Juno.

In addition to acquiring data with its own instruments, Juno will serve as a target for gravity science. Past Earth Flybys have shown an unexpected energy gain of a few mm/s on spacecraft passing Earth that can presently not be explained. This Flyby anomaly could be related to an error in current gravity models or it could be a sign of a non-gravitational force that is not accounted for in current models. Precise Doppler tracking of Juno for seven days before and after the flyby will provide detailed data.

Tracking and Telemetry Relay during the flyby will be completed by the Deep Space Network Station in Madrid, Spain. A gap in Madrid coverage starting at 2.25 hours before closest approach until 1.5 hours afterwards will be covered by ESA stations in Perth (Australia) and Malargue (Argentina), leaving just a small gap of 7 minutes before to 20 minutes after closest approach. Juno's Inertial Measurement Unit will be active during the flyby to register even minute accelerations caused by non-gravitational forces to shed light on the Flyby anomaly.

[свернуть]

The Earth Flyby represents the only time Juno will be in eclipse during its entire mission. The spacecraft will enter Earth's shadow at 19:19:37 UTC as it passes 700 Kilometers above the ocean 1,100 Kilometers south of Cape Town.

Before entering eclipse, observers in South Africa should get a good view of the spacecraft possibly with the naked eye but binoculars would help spot the spacecraft.

Closest Approach occurs at 19:21:25 UTC and Juno exits eclipse at 19:43:02 UTC.

After exiting eclipse, observers in India might get a view of Juno using standard binoculars. Observers in North America can also catch a view of Juno using telescopes as the vehicle departs Earth several hours after the Flyby. About ten hours after the Flyby, Juno will be flying past the Moon's orbit, bidding farewell as its is headed out to Jupiter for good.


———
October 7, 2013

[KBOB]

На борту 3 Лего-астронавта
http://upload.wikimedia.org/wikipedia/commons/0/0a/Juno_lego.jpg>

[ОАЯ]

Господин Ю, госпожа Терра и доктор Пи?

[Bizonich]

ОАЯ пишет:
Господин Ю, госпожа Терра и доктор Пи?

Не совсем, Юпитер, Юнона и Галилей.

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http://juno.wisc.edu/juno-mission.html

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09.16.13

Juno POSITION & STATUS

As of Sept. 16, Juno was approximately 13 million miles (21 million kilometers) from Earth. The one-way radio signal travel time between Earth and Juno is currently about 71 seconds. Juno is currently traveling at a velocity of about 23 miles (37 kilometers) per second relative to the sun. Velocity relative to Earth is about 7 miles (11 kilometers) per second. Juno has now traveled 951 million miles (1.53 billion kilometers, or 10.1 AU) since launch.

The Juno spacecraft is in excellent health and is operating nominally. All science instruments are powered off except for the magnetometer experiment, which continues to operate in low-power mode.

Recent spacecraft significant events

With less than one month to go until Juno's Earth flyby gravity assist, the Juno mission operations team successfully executed a trajectory control maneuver (named TCM-7) using Juno's attitude control thrusters on Sept. 9. This maneuver further refines the spacecraft's trajectory in preparation for the Oct. 9 flyby.

Juno is, technically speaking, already on course for Jupiter arrival in July 2016. The spacecraft must still fly by the Earth to receive the gravity assist it needs in order to reach Jupiter, but the recent set of trajectory control maneuvers put Juno on the required path to achieve its gravity assist as planned.

The spacecraft reached perihelion – the closest point in its current orbit around the sun – on Aug. 31. From that point onward, the sun's rays will become increasingly faint. When Juno arrives at Jupiter, the arrays will produce about 450 Watts of electric power from a mere four percent of the light we receive at Earth's distance from the sun.

See Juno's current position, speed and more via NASA's Eyes on the Solar System 3D interactive. Launch the Juno module or view Juno in the standard Eyes on the Solar System interface. Additional information about the mission is available on NASA's Juno mission pages.

http://missionjuno.swri.edu/news/status-20130916

[KBOB]

Flyby anomaly при пролете JUNO будет тщательно измерена.
http://anonymouse.org/cgi-bin/anon-www.cgi/http://www.bbc.com/future/story/20131009-spacecraft-tests-sling-theory/1

[Space Alien]

Луна с "Юноны" от  9 октября 2013 года, то есть сегодняшнее фото.

[pkl]

Я сначала подумал, что это Марс. :oops:  Через какой светофильтр они снимали?

[PIN]

Safe Mode

http://www.planetary.org/blogs/emily-lakdawalla/2013/10091550-juno-safe-mode.html

Как раз утром встретил сменившихся коллег, они первыми и увидели. Не пошла телеметрия, посмотрели спектр - передатчик на кодировании, соответствующем ЗР, 30 бит в сек.

[Victor123]

Да, отнял немного импульс у Земли.

[che wi]

Зонд "Джуно" выпал в "безопасный режим" во время пролета мимо Земли
http://www.ria.ru/space/20131010/969086555.html

МОСКВА, 10 окт — РИА Новости. Зонд НАСА "Джуно", который вечером в среду пролетел рядом с Землей и направился к Юпитеру, по неизвестным причинам вошел в "безопасный режим", в котором большая часть аппаратуры, кроме критически важной, отключается.

"Джуно" вошел в тень Земли в обычном режиме, а вышел из него в "безопасном", — сказал руководитель проекта Рик Нибаккен из Лаборатории реактивного движения НАСА, чьи слова приводятся в сообщении на сайт американской неправительственной организации Planetary Society.

Нибаккен подчеркнул, что с зондом поддерживается связь, после гравитационного маневра у Земли он вышел на запланированную орбиту. Сейчас специалисты анализируют телеметрическую информацию, чтобы выяснить причины сбоя. Информация о состоянии зонда на сайте НАСА и в официальных аккаунтах в социальных сетях не обновляется из-за бюджетного кризиса в США.

"Безопасный режим" аппарата предназначен для выживания космического аппарата в случае сбоя. Зонд переходит в этот режим, когда его системы регистрируют резкое изменение температуры, короткое замыкание или другие нештатные ситуации.

Зонд, запущенный в августе 2011 года и совершивший полный круг вокруг Солнца в среду вернулся к Земле, чтобы воспользоваться ее гравитацией как "пращой", увеличить скорость и отправиться к месту назначения — Юпитеру. Аппарат пролетел мимо Земли на расстоянии 559 километров, на 14 минут "Джуно" оказался над ночной стороной планеты, и в эти минуты датчики "Джуно" зарегистрировали нечто, что заставило аппарат войти в "безопасный режим".

Ожидалось, что зонд во время "свидания" сделает снимки Земли и Луны. Снимки Луны уже появились в социальных сетях, однако удалось ли аппарату заснять Землю, пока неясно. Планируется, что "Джуно" достигнет орбиты Юпитера 4 июля 2016 года в 02.29 по Гринвичу. Основной задачей зонда станет изучение химического состава планеты: в частности, аппарат оценит количество кислорода и воды, что позволит сузить круг гипотез о процессе формирования газового гиганта.

[ronatu]

Надоели мы ему.

[scream]

во всем виноват кризис?