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LADEE - Minotaur V - 07.09.2013 -- Wallops/MARS
 
 
08:00:00 мск.
 
 
Ракета "Минотавр" успешно вывела лунный зонд LADEE на орбиту
http://ria.ru/science/20130907/961448076.html

Цитата
МОСКВА, 7 сен — РИА Новости. Ракета "Минотавр-5", стартовавшая в субботу с космодрома на острове Уоллопс, на восточном побережье США, успешно вывела лунный зонд LADEE на околоземную орбиту. Трансляция запуска идет на сайте НАСА.

Через 23 минуты после запуска, который произошел, как планировалось в 07.27 мск, аппарат отделился от пятой ступени ракеты и отправился в самостоятельный полет.

Это был первый полет новой ракеты "Минотавр-5" (Minotaur V), созданной корпорацией Orbital, а также первый запуск аппарата за пределы околоземной орбиты с космодрома на острове Уоллопс.
Аппарат будет оставаться на высокоэллиптической околоземной орбите около 23 дней, чтобы выйти к Луне в нужное время и в нужном положении. В этот период ученые проведут первые проверки бортового оборудования и научных приборов.

Затем в течение недели специалисты переведут зонд на высокую окололунную орбиту, которая затем будет постепенно понижаться до рабочей орбиты высотой около 50 километров.

Главная задача аппарата LADEE (Lunar Atmosphere and Dust Environment Explorer) — исследование крайне разреженной лунной атмосферы (экзосферы) и пылевых частиц у ее поверхности. Собранные данные помогут ученым судить о экзосфере Меркурия и других тел Солнечной системы.

С помощью этого аппарата будет также проведен эксперимент по лазерной связи между Луной и Землей.
 
Из более удалённой точки:

 


отсюда
 
Цитата
@RT_russian
Запуск космического аппарата NASA - LADEE - был виден невооружённым глазом в небе над Нью-Йорком (ФОТО) pic.twitter.com/BLCLIbgCtT
 
Ещё фото здесь:
http://www.flickr.com/groups/ladee/pool

пока небольшие траблы с аппаратом:

Цитата
NASA’s LADEE spacecraft remained in safe mode following its flawless launch on Saturday when it encountered a minor problem with its reaction wheels that are used to control the vehicle’s orientation in space.

LADEE was launched atop a Minotaur V rocket that blasted off fr om Pad 0B at Wallops Flight Facility at 3:27 UTC on Saturday, 11:26 p.m. local time on Friday. Ascent and orbital insertion was completely successful and LADEE was delivered to its expected Lunar Transfer Orbit by the Minotaur rocket that performed a 24-minute ascent mission. LADEE’s Countdown and Launch is detailed in the mission update below.

Following separation from the launch vehicle, the LADEE spacecraft established communications with the Hartebeesthoek ground station, South Africa that relayed telemetry to the LADEE Mission Operations Center at NASA’s Ames Research Center, California. Telemetry indicated that there were no problems with the spacecraft as it went through its initial steps in orbit. LADEE entered an automatic safe mode after orbital insertion and was expected to transition to nominal operations within 24 hours after launch.

One of the next steps was the acquisition of three-axis control. For that, LADEE had two options – using its four Attitude Control Thrusters or using the Reaction Wheels of the vehicle. In the event of larger rates on the vehicle as a result of spacecraft separation, the thrusters were to be used, but LADEE only showed small rates so that the reaction wheels were activated to correct the small attitude bias.

Shortly after activation, the reaction wheels were disabled again after a current lim it was exceeded by the wheels that drew more current than expected for some reason. The flight computer automatically turned the system off to wait for input from Earth while keeping the spacecraft in safe mode. Data of the anomaly is already being studied by Mission Controllers.

The Reaction Wheels are the primary attitude control system for the LADEE mission. The four Reaction Wheels are arranged in a pyramidal fashion to provide three-axis stabilization. They are used for precise vehicle pointing as well as slew maneuvers. During Reaction Wheel momentum dumps, the RCS thrusters are used to counteract forces and so keep the vehicle stable.

The issue that occurred is not expected to be of a serious nature and teams expect that it will be resolved for the mission to continue without being impacted by the anomaly. Acquiring three-axis control is not a critical requirement for LADEE, because it features body-mounted solar panels that can generate power in virtually any spacecraft orientation. Spacecraft with fixed solar panels have to be in a sun-pointing attitude to produce power.

Additionally, LADEE could use its Attitude Control Thrusters to maintain its attitude should the Reaction Wheels not be available any time soon. Using the thrusters would consume valuable propellant that is needed for orbit maintenance once reaching the Moon. Good attitude control will be required during the first Trajectory Maneuver planned at L+6 Days.

Mission Controllers will continue to troubleshoot the anomaly and send commands to the spacecraft once a solution is found.
 
Красивый и быстрый старт  8)  ))! Поздравляю  :) !
 
Да, красиво. И всего в двухстах километрах от центрального офиса НАСА. Домашний полигон центрального аппарата.
Русские, не теряемся. Переоборудуем стартовую позицию где-нибудь по Владимиром и пуляем на выходные по Луне, Марсу.... :)
 
 
Пресс-релиз Orbital по поводу запуска
http://www.orbital.com/NewsInfo/release.asp?prid=866
 
The probe's onboard computer shut down LADEE's reaction wheels, which are used to stabilize the attitude of the probe in space, after noticing that they were drawing too much current.

Одни ресурсы пишут, что решение возникшей проблемы с LADEE может занять несколько дней, другие – несколько недель. Представитель НАСА успокаивает:

Цитата
But there's no reason to panic, NASA officials said.

"This is not an unusual event in spacecraft," Pete Worden, director of NASA's Ames Research Center in Moffett Field, Calif., which is leading the LADEE mission, said during a press conference in the wee hours of Saturday morning (Sept. 7). LADEE was developed and built at the Ames center.

"I've been involved with a lot of missions, particularly missions with small spacecraft," Worden said. "[They] quite often have things that don't come on the way you want. The really important thing is that we have full communications. Everything is healthy onboard the spacecraft. Everything is working, and the computer did what it was supposed to do."

з.ы. поправьте, если ошибаюсь: reaction wheels (которые отключил бортовой компьютер LADEE) – это подобного рода двигатели-маховики для ориентации КА?
 
LADEE Status

Sept. 7, 1:40 p.m. EDT Update

NASA has confirmed that the reaction wheels of its Lunar Atmosphere and Dust Environment Explorer (LADEE) were successfully brought back on-line and the spacecraft has acquired its safe-mode attitude profile.
Last night during technical checkouts the LADEE spacecraft commanded itself to shut down the reaction wheels used to position and stabilize the spacecraft. According to the LADEE mission operations team at NASA's Ames Research Center in Moffett Field, Calif., this was determined to be the result of fault protection limits put in place prior to launch to safeguard the reaction wheels. The limits that caused the powering off of the wheels soon after activation were disabled, and reaction wheel fault protection has been selectively re-enabled.
“Our engineers will determine the appropriate means of managing the reaction wheel fault protection program. Answers will be developed over time and will not hold up checkout activities,” said Butler Hine, LADEE project manager.
“The initial checkout flight procedure is progressing,” said S. Pete Worden, Ames center director. “The reaction wheel issue noted soon after launched was resolved a few hours later. The LADEE spacecraft is healthy and communicating with mission operators.”
The spacecraft was successfully launched at 11:27 p.m. EDT Friday, Sept. 6, from Pad 0B at the Mid-Atlantic Regional Spaceport, at NASA's Wallops Flight Facility, Wallops Island, Va. LADEE is on its way to arrive at the moon in 30 days, then enter lunar orbit.
LADEE is managed by NASA's Ames Research Center in Moffett Field, Calif.

http://www.nasa.gov/mission_pages/ladee/main/index.html
Go MSL!
 
Цитата
che wi пишет:
з.ы. поправьте, если ошибаюсь: reaction wheels (которые отключил бортовой компьютер LADEE) – это подобного рода  двигатели-маховики  для ориентации КА?

Да, похожие.
Go MSL!
 
Растрясли наверное. Все же бывшие боевые ракеты не совсем приспособлены для доставки нежных аппаратов.
 
Если бы их растрясли, то они бы потом не включились. Кроме того, отключились судя по тексту все маховики (коих должно быть не менее 3-х, а в случае резервирования не менее 4-х).
Ну и сказано, что был превышен некий порог, по которому БКУ принимает решение их отключить... Что за пороговое значение - судить трудно... Возможно, просто слишком перестраховались, заложили в ПЗ такое значение параметра по которому контролируют что-то в системе маховиков, что оно просто оказалось неадекватно заниженным... В результате чего условие на отключение произошло даже при работоспособных маховиках.
 
Цитата
instml пишет:
LADEE Status

Sept. 7, 1:40 p.m. EDT Update

NASA has confirmed that the reaction wheels of its Lunar Atmosphere and Dust Environment Explorer (LADEE) were successfully brought back on-line and the spacecraft has acquired its safe-mode attitude profile.
...

http://www.nasa.gov/mission_pages/ladee/main/index.html
Отрадно, будем надеяться дальше всё пойдёт штатно.
 
The LADEE spacecraft is currently in an elliptical orbit around Earth, about 162,000 miles (260,000 Km) in altitude. Mission controllers are now performing an extended checkout phase including guidance, navigation and control characterization, reaction control system tests, and on-board controller tuning
Когда жизнь экзаменует - первыми сдают нервы.
 
LADEE will continue with two more of these elliptical orbits until it is captured around the moon to do its initial Lunar Orbit Insertion (LOI-1) burn on Sunday Oct. 6th. After that we are in lunar orbit. This LOI burn is one of the most critical phases of the mission, because without it working we do not get into lunar orbit.
Когда жизнь экзаменует - первыми сдают нервы.
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