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Al Yah 3, SES-14 (NASA GOLD) - Ariane 5 ECA (VA241) - Kourou ELA-3 - январь 2018 г.
 
Короче, ждать до сентября пока перегей и апогей не окажутся в плоскости экватора.

Причём, как я посмотрел, аргумент перицентра двигается не в ту сторону    - не 229 до 180, как хотелось бы... а с 229 в сторону 360 грудусов  :D
Изменено: Чебурашка - 31.01.2018 11:08:32
 
А тем временем оба спутника начали интенсивный подъём орбиты и уменьшение наклонения.
Причём, химический "AL YAH 3" делает это резвее "электрического" собрата SES-14

AL YAH 3 - Orbit
Epoch (UTC):01 February 2018 22:50:44
Eccentricity:0.7506364
inclination:19.9971°
perigee height:677 km
apogee height:43154 km
right ascension of ascending node:231.0674°
argument of perigee:235.3921°
revolutions per day:1.82411557
mean anomaly at epoch:333.7340°
orbit number at epoch:13
SES 14 - Orbit
Epoch (UTC):01 February 2018 18:29:59
Eccentricity:0.7574920
inclination:20.1420°
perigee height:528 km
apogee height:43674 km
right ascension of ascending node:231.8550°
argument of perigee:234.2350°
revolutions per day:1.80636087
mean anomaly at epoch:188.0540°
orbit number at epoch:13
 
Что там во франкоязычном тырнете пишут про расследование причины аномалии?
Инженеру не положено знать цифровые значения (с) Старый
Мои цели и мотивы - дать стране прекрасную перспективную ракету (с) Старый
 
На spaceflight101 появилась статья с неофициальным описанием происходившего, расчетами, а также информацией/ссылками на отдельные аспекты работы наземной команды, включая range safety:


http://spaceflight101.com/ariane-5-va241/ariane-5-va241-anomaly-analysis/
 
Да, отличный анализ на основе открытой информации.
И разумное объяснение, почему не отправили команду на вскрытие баков/ТТУ.
 
Цитата
PIN пишет:
Да, отличный анализ на основе открытой информации.
И разумное объяснение, почему не отправили команду на вскрытие баков/ТТУ.
Да, как взаимодействуют в ЦУПе они описали.

А причина, по которой РН не по тому азимуту полетела - не входит в сферу их интересов?
Инженеру не положено знать цифровые значения (с) Старый
Мои цели и мотивы - дать стране прекрасную перспективную ракету (с) Старый
 
А причина публично ещё не озвучена, можно только гадать, см. выше насчёт ошибки в ПЗ.
 
Упс-с. Мы уже почти на стационаре
AL YAH 3 - Orbit

Epoch (UTC):13 February 2018 17:26:58
Eccentricity:0.3271378
inclination:6.2282°
perigee height:20829 km
apogee height:47284 km
right ascension of ascending node:205.9731°
argument of perigee:259.9604°
revolutions per day:1.06774875
mean anomaly at epoch:32.9272°
orbit number at epoch:31
Изменено: Чебурашка - 14.02.2018 10:49:11
 
Цитата
DutchSpace‏ @DutchSpace 9h ago

So,#VA241 in my 2 previous posts (https://twitter.com/DutchSpace/status/960646821977690112 … & https://twitter.com/DutchSpace/status/962088941338972161 …) it seems clear to me that the roll manoeuvre started too early (normally at H+17 sec) I'm still questioning why it would roll too early, "just" because of wrong azimuth entry ? I'm not sure...
 
Цитата
Peter B. de Selding‏ @pbdes 11h ago

CEO @Eutelsat says expects @yahsatofficial Al Yah 3 sat, put in bad orbit by @ArianeGroup Ariane 5 Jan 25, will be in service by midsummer.
 
Цитата
Caleb Henry‏ @CHenry_SN 20m ago

YahSat says its Al Yah 3 satellite that was launched into an off-track orbit will arrive at its GEO orbital slot in June. No word on if service will start that month or later.
 
Цитата
Jonathan McDowell‏Подлинная учетная запись @planet4589 22 мин. назад

The misdelivered Ariane payloads continue heading to GEO. Here is average height vs time for the two payloads (and the rocket stage and SYLDA adapter). SES-14, using electric propulsion, is climbing steadily while the chem prop on AY3 makes big burns


24 мин. назад

Same story for the inclinations of the two satellites relative to the equator
 
Arianespace опубликовала заключение комиссии:

http://www.arianespace.com/press-release/independent-enquiry-commission-announces-conclusions-concerning-the-launcher-trajectory-deviation-during-flight-va241/

Цитата
/.../
Investigations by the Independent Enquiry Commission showed that the trajectory anomaly resulted from an incorrect value in specifications for the implementation of the launcher’s two inertial reference systems. Given the special requirements of this mission, the azimuth required for the alignment of the inertial units was 70 degrees instead of 90 degrees, as is most often the case for missions to geostationary transfer orbit. This gap led to the 20-degree shift to the south in the launcher trajectory from the initial seconds of flight. The cause of the trajectory deviation, therefore, was due to a bad specification of one of the launcher mission parameters that was not detected during the standard quality checks carried out during the Ariane 5 launches’ preparation chain.
/.../
 
Цитата
che wi пишет:
Arianespace опубликовала заключение комиссии:

http://www.arianespace.com/press-release/independent-enquiry-commission-announces-conclusions-concerning-the-launcher-trajectory-deviation-during-flight-va241/
Цитата
/.../
Investigations by the Independent Enquiry Commission showed that the trajectory anomaly resulted from an incorrect value in specifications for the implementation of the launcher’s two inertial reference systems. Given the special requirements of this mission, the azimuth required for the alignment of the inertial units was 70 degrees instead of 90 degrees, as is most often the case for missions to geostationary transfer orbit. This gap led to the 20-degree shift to the south in the launcher trajectory from the initial seconds of flight. The cause of the trajectory deviation, therefore, was due to a bad specification of one of the launcher mission parameters that was not detected during the standard quality checks carried out during the Ariane 5 launches’ preparation chain.
/.../
Метеор-дубль?!
И днём и ночью кот - учёный!
 
Как и ожидалось.

Цитата
Атяпа пишет:
Метеор-дубль?!
Плюс-минус то же самое.
 
Так что, добавку в 20 градусов не в ту сторону влупили и полетели по азимуту 110?
Инженеру не положено знать цифровые значения (с) Старый
Мои цели и мотивы - дать стране прекрасную перспективную ракету (с) Старый
 
Нет, просто ошиблись на 20 градусов, судя по официозу
 
Возможно, то же самое, но на родном и могучем...
Цитата
Согласно обнародованным данным, основной рассматриваемой аварийной комиссией версией причины неудачного запуска КА SES-14 и Al Yah-3 является неправильное вычисление текущего азимута ракеты Ариан 5 ЕСА. Это являлось основной причиной полета ракеты по нерасчетной траектории. В настоящее время оба аппарата находятся в нормальном состоянии и перейдут на геостационарную орбиту в июне-июле 2018 года.
 
http://www.esa.int/For_Media/Press_Releases/Action_plan_approved_for_next_A­riane_5_launches
Цитата


ESA

N° 4–2018: ACTION PLAN APPROVED FOR NEXT ARIANE 5 LAUNCHES

2 March 2018

After the release of the conclusions of the Ariane VA241 Independent Enquiry Commission on 22 February, the findings and recommendations were formally presented to a Steering Board on 28 February. The board included Daniel Neuenschwander, ESA Director of Space Transportation; Stéphane Israël, Arianespace CEO; and Alain Charmeau, ArianeGroup CEO.

As stated in the Arianespace press release of 23 February, the direct cause of the trajectory deviation on 25 January was an incorrect value provided to the launcher’s two Inertial Measurement Units (IMUs). Given the special requirements of this mission, the azimuth required for the IMU alignment was 70º but the usual value for geostationary transfer orbit missions of 90º was erroneously used instead. This difference led to the 20º shift to the south in the trajectory from the first seconds of flight.

The underlying reasons for the direct cause have been clearly identified: a need to strengthen the processes for establishing, verifying and approving the specific operational procedures involving the IMU reference frame.

Recommendations to improve processes and quality control have been made. Furthermore, additional recommendations to enhance end-to-end verifications of mission-specific parameters used during the launch campaign were made.

ArianeGroup and Arianespace presented their action plan in response to the Independent Enquiry Commission findings and recommendations.

ESA Inspector General Toni Tolker-Nielsen expressed his satisfaction with the presented action plan, which not only addresses the current issue, but a general plan to improve processes and end-to-end verifications, in particular of the few parameters that are not verified because of their nature during the test on the Functional Simulator before each launch.

Thanks to the action plan of ArianeGroup and Arianespace, the reliability of the Ariane 5 launch system, which already had an outstanding series of mission successes establishing it as a market leader, will be further increased.

The actions will enable the next flight of this heavy-lift vehicle to be made this month.

The Steering Committee mandated the ESA Inspector General to monitor the satisfactory implementation of the action plan of ArianeGroup and Arianespace.
 
Цитата
Peter B. de Selding‏ @pbdes 4h4 hours ago

Yahsat expected to file $108-million claim for loss of life on Al Yah 3 satellite because of @Arianespace @ArianeGroup Ariane 5 off-target orbital injection.
Цитата
PARIS — Satellite fleet operator Yahsat estimates that it has suffered a 43% loss of revenue-generating capacity on its Al Yah 3 satellite as a result the bad orbit insertio...
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