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

Автор Logan, 02.06.2005 15:05:12

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Quооndo

Надеюсь что как минимум до 2021-22 гг. поболтается орбите Юпитера пока туда не отправят что-нибудь новое в 2020-х на SLS или чем то похожем. Миссия Юноны имеет важное значение несмотря на скудность оборудования и общей "незначительной" стоимости достаточно амбициозной программы - подтвердить возможность летать на солнечных батареях за орбитой марса. Считаю, что в этой части важный этап освоения космического пространства.

Boo

Dawn и Розетта сильно расстроились от такого сообщения.. Похлопали батареями и грустят.
Аффтар, съешь еще этих мягких французских булочек да выпей царской водки!

Pirat5

ЦитироватьQuооndo пишет:
Надеюсь что как минимум до 2021-22 гг. поболтается орбите Юпитера пока туда не отправят что-нибудь новое
Много раз писалось:
Цитировать
Миссия Juno будет одной из самых коротких для НАСА. Она должна завершиться в феврале 2018 года затоплением станции в атмосфере газового гиганта. Таким образом ученые собираются предотвратить попадание биоматериала с Земли на спутники Юпитера, в подледных океанах которых допускается существование жизни (Европу, Ганимед и Каллисто).
Это чтоб не тратить деньги, как на Opportunity, Voyager и прочее

Vi1

ЦитироватьPirat5 пишет: 
Это чтоб не тратить деньги, как на Opportunity, Voyager и прочее
Понаберут в JPL руко*опых сотрудников, делают слишком надежную технику, потом в НАСА мучаются выбивают ассигнования у конгрессменов на продление миссий. Подряд нужно отдавать в НПОЛ - запустили прототип на орбиту, столкнулись с ТЗЧ, упали в Атлантику (запуск из Флориды), деньги попилили...

Dmitry

Наглядная гифка для сомневающихся в интересности фотографий с JUNO
Отсюда: https://www.reddit.com/r/space/comments/4lq8uz/what_juno_will_see_when_it_enters_orbit_around/
Спойлер

[свернуть]

Pirat5

#405
https://www.missionjuno.swri.edu/news/juno-closing-in-on-jupiter-media-briefing-to-discuss-july4-arrival
Цитировать06.14.16
JUNO CLOSING IN ON JUPITER, MEDIA BRIEFING TO DISCUSS JULY 4 ARRIVAL

NASA will host a media briefing at 11 a.m. PDT (2 p.m. EDT) on Thursday, June 16, to discuss the agency's Juno spacecraft and its July 4th arrival at Jupiter. 
The briefing will be held at NASA Headquarters in Washington, and broadcast live on NASA Television and the agency's website. 

The solar-powered spacecraft will perform a suspenseful Jupiter orbit insertion maneuver -- a 35-minute burn of its main engine -- which will slow Juno by about 1,200 mph (542 meters per second) so it can be captured into the gas giant's polar orbit. Juno will loop Jupiter 37 times during 20 months, skimming to within 3,100 miles (5,000 kilometers) above its swirling cloud tops. 

Juno will provide answers to ongoing mysteries about Jupiter's core, composition and magnetic fields, and provide new clues about the origins of our solar system.

For NASA TV downlink information and schedules, and to view the news briefing, visit: http://www.nasa.gov/nasatv
The briefing will also be streamed live on: http://www.ustream.tv/nasajpl2

che wi

ЦитироватьPirat5 пишет:
NASA will host a media briefing at 11 a.m. PDT (2 p.m. EDT) on Thursday, June 16
18:00 UTC / 21:00 MSK

Dmitry

Очень информативная заметка

Цитировать
    [/li]
  • JunoCam's wide field of view means that most of the time, its photos of Jupiter will be quite small. It can achieve higher resolution than most amateur astrophotos only when it is within roughly a million kilometers of the planet. (As a general rule of thumb, divide 210 by the range to Jupiter in millions of kilometers and you'll get Jupiter's apparent diameter to JunoCam, in pixels.)
  • No high-resolution Jupiter photos will be taken during Jupiter orbit insertion on July 5. JunoCam and all the science instruments will be turned off from 5 days before Jupiter arrival until 2 days after Jupiter arrival. Jupiter arrival is also called Perijove 0.
  • Juno's orbit is highly elliptical, so it spends almost all of its time much farther than a million kilometers from Jupiter. During the science mission, it will only get moderately high-resolution photos of Jupiter within a two-day period around each perijove.
  • Truly detailed photos -- ones in which Jupiter appears bigger than the full JunoCam field of view, and in which Juno can see more detail than Cassini did during its one Jupiter flyby -- are only possible within a two-hour period around each perijove.
  • The next time after Perijove 0 that Juno will be within a million kilometers of Jupiter is on August 27, beginning about 12 hours before Perijove 1. All the science instruments will operate through Perijove 1. August 27 should be a fantastic day for JunoCam!
  • JunoCam photos received on Earth will not be automatically posted to the mission website until some time after Perijove 1 and possibly as late as Perijove 3. That is to say, automated raw image release is planned to begin some time in September or October. Other images will be released before that, but not all of them, and after some delay. Once automated image release does begin, all of the images that Juno has taken will be made available to the public.
  • So the first time we will see high-resolution images automatically released to the JunoCam website will be after Perijove 3, which happens on November 2.
  • When the Juno mission does begin automated release of raw images, you will be able to find them here.
http://www.planetary.org/blogs/emily-lakdawalla/2016/06090600-what-to-expect-from-junocam.html

Chilik

ЦитироватьPirat5 пишет:
NASA will host a media briefing at 11 a.m. PDT (2 p.m. EDT) on Thursday, June 16, to discuss the agency's Juno spacecraft and its July 4th arrival at Jupiter.
Всё правильно, 1 мая и 7 ноября у них не являются праздничными датами.

che wi


che wi


hlynin

"Юнона" выходит на орбиту (NASA Press Kit, Jupiter Orbit Insertion) (на англ.) 2016, июнь в pdf - 24,6 Мб
 Космический аппарат НАСА "Juno" прибудет к Юпитеру в 2016 году, чтобы изучить самую большую планету нашей Солнечной системы Некоторая справочная информация: о Юпитере и истории его наблюдения, описания 13 фаз миссии, космического аппарата и его систем, научных целей, 9 экспериментов, а также управление программами и проектами. "Для достижения своих научных целей, Juno выйдет на орбиту над полюсами Юпитера и пройдёт очень близко к планете. Juno должен пролететь очень близко к Юпитеру, чтобы сделать очень точные измерения до и после пролёта." Выход на орбиту вокруг Юпитера запланирован на 4 июля 2016 года и "является важным событием и проводится в рамках последовательности. Если торможение у Юпитера не удастся и вывести космический аппарат на орбиту вокруг Юпитера не получится, то не будет никакой научной миссии. (...) не планируется научных наблюдений в течение выхода на орбиту Юпитера (все инструменты выключены). Все научные приборы будут включены приблизительно в период от выхода на орбиту минус 5 дней до плюс 50 часов".
 Вы можете скачать Press Kit также здесь:
 http://www.jpl.nasa.gov/news/press_kits/juno/
 Есть две версии: с высоким и средним разрешением (70 и 25 МБ)

Boo

Первые фото ожидаем не раньше августа
Аффтар, съешь еще этих мягких французских булочек да выпей царской водки!

Pirat5

Timeline of Juno's historic arrival at Jupiter
June 20................Juno's main engine cover opened
June 27................Warm-up of Juno's helium pressurant tank
June 28................Pressurization of Juno's propulsion system
June 29 at 8:47 p.m....Juno's science instruments switched off
June 30................Final command sequence uplinked to Juno
July 4 at 9:13 p.m.....Status tones start
July 4 at 9:16 p.m.....Start initial precession to JOI attitude
July 4 at 9:37 p.m.....End initial precession to JOI attitude
July 4 at 10:28 p.m....Start fast precession to JOI attitude; Switch to toroidal low-gain antenna
July 4 at 10:53 p.m....Juno in JOI attitude; spin up from 2 to 5 rpm
July 4 at 11:01 p.m....Juno spinning at 5 rpm
July 4 at 11:18 p.m....Start JOI burnJuly 4 at 11:53 p.m....End JOI burn
July 4 at 11:55 p.m....Begin spinning down from 5 to 2 rpm
July 5 at 12:07 a.m....Start precession from JOI to solar-pointing attitude
July 5 at 12:11 a.m....Switch to medium-gain antenna
July 5 at 12:16 a.m....End precession to solar-pointing attitude
July 5 at 12:36 a.m....Ground begins receiving detailed telemetry from Juno
July 5.................Replay of high data-rate telemetry
July 6.................Begin switch-on of Juno science payloads
July 13................Post-JOI trajectory course correction (if necessary)
Aug. 27................First perijove (with science instruments activated)
Oct. 19................Period reduction maneuver (from 53.5-day to 14-day orbit)
Feb. 20, 2018..........Nominal end of mission

http://spaceflightnow.com/2016/06/23/timeline-of-junos-historic-arrival-at-jupiter/

Times below are listed in "Earth Receive Time" and Eastern Daylight Time (GMT-4) as confirmation of the Jupiter Orbit Insertion (JOI) events arrives on Earth. The one-way light travel time from Jupiter to Earth is approximately 48 minutes.

Scua

ЦитироватьBoo пишет:
Первые фото ожидаем не раньше августа
  Нет, где-то в начале июля. Но невыразительные.

Scua

#415
Даже ещё раньше. Вот первый снимок, сделан 21 июня https://www.nasa.gov/feature/jpl/nasas-juno-spacecraft-closing-in-on-jupiter

Сергей Бод

July 4 at 10:53 p.m....Juno in JOI attitude; spin up from 2 to 5 rpm
Подскажите, а в чем необходимость это делать? И именно с такой скоростью: от 2 до 5?

pkl

Мой телескоп показывает куда лучше. :(
Вообще, исследовать солнечную систему автоматами - это примерно то же самое, что посылать робота вместо себя в фитнес, качаться.Зомби. Просто Зомби (с)
Многоразовость - это бяка (с) Дмитрий Инфан

Андрей Суворов

ЦитироватьСергей Бод пишет:
July 4 at 10:53 p.m....Juno in JOI attitude; spin up from 2 to 5 rpm
Подскажите, а в чем необходимость это делать? И именно с такой скоростью: от 2 до 5?
Больше пяти нельзя - наведение затрудняется. Меньше пяти нежелательно - нутации большие при работающем ЖРД. А два в минуту - это когда ЖРД не включается.

Salo

http://spaceflightnow.com/2016/06/29/junos-british-built-engine-readied-for-all-important-firing-at-jupiter/
ЦитироватьJuno's British-built engine readied for all-important firing at Jupiter             
 June 29, 2016 Stephen Clark
 
Artist's concept of the Juno spacecraft's Leros 1b main engine firing. Credit: NASA/JPL-Caltech

Ground controllers pressurized the Juno spacecraft's propulsion system Tuesday to prep for a July 4 rocket firing by the probe's UK-made rocket engine that will steer the spinning, solar-powered robot into orbit around Jupiter.
Kicking off more than 20 months observing Jupiter's atmosphere and magnetic field, Juno is poised to become the second spacecraft to ever orbit the solar system's king planet, and the first since NASA's Galileo orbiter ended its mission in 2003.
Juno's Leros 1b main engine, designed and built by Moog-ISP in Westcott, Buckinghamshire, is gearing up for a make-or-break 35-minute firing to steer the spacecraft into a wide multi-million mile ellipse around Jupiter. Confirmation of the burn's success is expected around 11:53 p.m. EDT July 4 (0353 GMT July 5).
Pointing roughly in Juno's direction of travel as the spacecraft spins up to 5 rpm, the engine will produce 145 pounds of thrust and consume a mix of hydrazine and nitrogen tetroxide. The toxic chemicals spontaneously combust when contacting each other, permitting the engine to generate thrust when Juno's computer commands propellant valves to open.
The goal of the burn late Monday is to change Juno's speed by 1,212 mph (541.7 meters per second), the exact value required for Jupiter's immense gravity to tug the spacecraft into a looping, oval-shaped 53.5-day orbit.
Juno will have one shot at the burn as it passes over Jupiter's north pole and within 2,900 miles (4,667 kilometers) of its swirling, banded cloud tops, nearly 10 times closer than any previous mission.
Engineers calculated the engine must fire at least 20 minutes or so for Juno to be captured into any orbit around Jupiter, and 35 minutes to reach the targeted trajectory, according to Rick Nybakken, the mission's project manager at NASA's Jet Propulsion Laboratory.
The Leros 1b engine aboard Juno ignited twice in 2012 to adjust the spacecraft's course, aiming the probe for a flyby of Earth in October 2013, using the planet's gravity to slingshot toward Jupiter. The engine also briefly fired for a few seconds each year to flush contaminants out of the propulsion system.
"We know how to set up the propulsion system," Nybakken said. "We know how the engine performs. The only thing new here is how the main engine performs, and the spacecraft performs, in Jupiter's intense radiation environment."
Juno's single main engine is similar to liquid-fueled orbit-raising thrusters flown on many communications satellites. More than 70 Leros engines have flown in space, and most of them boosted telecom platforms fr om elliptical post-launch drop-off orbits to their final operating stations in geostationary orbit more than 22,000 miles (about 35,786 kilometers) above Earth's equator.
The engine design also has a history in interplanetary spaceflight.
Leros 1b engines successfully steered NASA's Messenger mission into orbit around Mercury in 2011, helped get the Mars Global Surveyor and Mars Odyssey orbiters to the red planet, and flew on the NEAR Shoemaker spacecraft that became the first probe to orbit and land on an asteroid.
 
A Leros engine. Credit: Moog-ISP

Ground controllers opened a micrometeoroid shield covering the engine June 20, and engineers planned to warm up Juno's high-pressure helium tanks Monday before pressurizing the orbiter's propulsion system Tuesday. A member of Juno's team confirmed the events occurred as planned.
Juno switched off its science instruments Wednesday as attention focuses on the July 4 orbit insertion maneuver.
The spacecraft is scheduled to start its Jupiter arrival sequence Thursday and run on autopilot through next week's engine burn.
"It will be completely hands-off from that point," said Jeff Lewis, Juno flight operations lead engineer at Lockheed Martin, which built the spacecraft and uplinks commands to the probe at an operations center near Denver.
It takes 48 minutes for a radio signal to travel one way between Earth and Jupiter, so real-time commanding is impossible.
"The spacecraft has to be pretty smart and pretty autonomous," Lewis said. "There's a lot of on-board fault detection, so it can detect faults and take care of itself."
Without a successful insertion burn, there is no mission, so software engineers programmed Juno to do away with much of its conservative safety logic just for the July 4 arrival. If something fails or radiation zaps an electronic component, Juno will attempt to reboot and immediately resume the engine firing instead of going into safe mode and radioing Earth for help.
The so-called "auto restart" feature is a safeguard against the potential of a relatively minor fault ruining the mission, Nybakken said.
"For instance, if the radiation causes the computer to reset and the engine stops, it's not designed to just protect the spacecraft," Nybakken said. "It's designed, for this one portion of the mission, to restart the burn."
Juno's on-board navigation is also smart enough to tweak the duration of the burn as it happens, incorporating data on the engine's mixture ratio and performance, Lewis said.
Even if the navigation system runs into trouble, he said, Juno's computer has a timer to turn off the engine at a prescribed time to ensure the burn does not run long.
But Juno is going into an unexplored realm, with its entire $1.1 billion mission riding on the outcome of Monday's maneuver.
Juno will brush by Jupiter's dangerous radiation belts on the way in Monday, with its most sensitive electronics wrapped inside a titanium vault designed to repel most impacts by high-energy particles that could damage the orbiter's computers.
"We go in sort of like a dive bomber," said Scott Bolton, an astrophysicist at the Southwest Research Institute who leads Juno's science team. "We go in really fast and get out fast. That speed itself is really hazardous, and we're also spinning. We're this giant solar array spacecraft cartwheeling through this incredible magnetic field and radiation belt, so it's a little bit scary."
Juno will repeat its close-up encounters with Jupiter, called "perijoves" by orbital dynamicists, 36 more times before it plunges into the planet's atmosphere for a destructive finale in February 2018. On each flyby, Juno will collect data on Jupiter's magnetic and gravity fields, investigate the planet's enigmatic interior, and take pictures, all while subjecting itself to the solar system's most dangerous environment outside the sun.
But the July 4 arrival carries even more risk with the whole mission at stake.
"I think the Jupiter Orbit Insertion is the second highest risk (of the mission, after launch)," Bolton said. "Everything is riding on it. This spacecraft is very complex. This was a great challenge. We are going literally wh ere no one has gone before."
"Были когда-то и мы рысаками!!!"