Hope Probe to hit Martian orbit on February 9

DG Staff

Sheikh Mohammed bin Rashid Al Maktoum

DUBAI 9 November 2020: The Emirates Mars Mission (EMM) yesterday announced the successful completion of TCM3 – its third and last major trajectory correction maneuver.

With 189 million kilometers remaining, the Hope Probe will reach its planned orbit around Mars on February 9, 2021. It has already covered 60 percent of its journey, equivalent to 290 million kilometers in 111 days since its launch on July 20.

This announcement of the probe’s arrival date to Mars comes following His Highness Sheikh Mohammed bin Rashid Al Maktoum, Vice-President and Prime Minister of the UAE and Ruler of Dubai’s tweet: “The Hope probe has completed its last trajectory correction maneuver after travelling 290 million km into space in 111 days. We officially announce Hope probe will arrive to Mars on Feb. 9, 2021 at 7:42pm UAE timing. We will celebrate the arrival of the first Arab mission to Mars.”

His Highness added: “Even before reaching its orbit, the Emirates Mars Mission’s Hope Probe has succeeded in instilling a new culture in the hearts and minds of this nation’s men and women; a culture that prioritizes science in shaping our future and reiterates our nation’s limitless ambitions after successfully entering space. We have become the first Arab country to succeed in exploring a planet, and our nation joins an exclusive group of only seven countries that have explored Mars.”

His Highness praised the EMM team’s efforts and said: “I want to thank you for your efforts, perseverance, determination and dedication in prioritizing the success of this project despite the unusual circumstances the world is going through. You are achieving this mission with success that far exceeds expectations. We will celebrate together – by God’s will – on February 9, when the Hope Probe reaches its orbit.”

Cruise Phase

The probe is currently in its cruise phase. During this time, the operations team at the ground station at MBRSC in Dubai periodically monitors the state of the probe, as it is in contact with the spacecraft two to three times a week, to check the subsystems health, calibrate and understand the performance of the probe. This phase also includes monitoring the probe’s flight path by conducting a series of trajectory correction maneuvers (TCMs). The project team conducted two successful maneuvers previously, in addition to a more recent one, which is the third in the probe’s trip to Mars. Currently the team is back to the 24-hour contact schedule to prepare for the next phase.

Entering the Martian orbit

Following the cruise phase, the probe will enter the Mission Orbit Insertion (MOI) phase. At this time, the team will focus on safely entering a capture orbit around Mars. This process requires slowing down the probe, and nearly 50 percent of the fuel will be used to do so. The fuel burn will last approximately 30 minutes and reduce the speed of the spacecraft from over 121,000 km/h to approximately 18,000 km/h. Due to the radio signal lag from Mars – it takes radio signals 13 to 26 minutes to travel from Hope around Mars to the ground network on Earth – the team will not be able to intervene and communicate with the probe, resulting in the mission being 100 percent autonomous.

Moving into Scientific Orbit

The Transition to Science phase begins at the end of MOI and will last until the observatory is in an acceptable science orbit and the commissioning is complete, about 75 days. The spacecraft’s capture orbit will take it as close as 1,000 km above Mars’ surface (a 40-hour elliptical orbit), and ranges from 1,000 kilometers to 49,380 kilometers. This is the period where the first image of Mars will be taken and transmitted back to the Mission Operation Center (MOC). During this phase, preparations for primary science operations take place and daily contacts are scheduled, enabling a quick turn-around of command sequence uploads and telemetry receipt.

The probe will remain in scientific orbit for a full Martian year (687 Earth days) and continue to take pictures of Mars and send them to the earth station.

Star trackers

The Right Trajectory Engineer Omran Sharaf, EMM Project Director, said “We will be using the EMUS spectrograph to make early observations of Mars’ outer hydrogen halo as well as adding new data to interplanetary hydrogen modelling. We will also use the star trackers on board to perform measurements of interplanetary dust as we cruise towards MOI. The current performance of Hope has provided the science team an opportunity to make measurements capturing valuable science data that can only be captured en route to a planet, which means that we will actually have commenced science data gathering even before we enter into our capture orbit in February and then transition to our science orbit. We will be making novel science data available to the international community even earlier than we had originally planned.”

By enabling the dust tracking feature in Mars Hope’s star trackers, measurements of interplanetary dust density can be made far from Earth’s orbit that will contribute to our understanding of the distribution of dust throughout the solar system. Additionally, the EMUS (Emirates Mars Ultraviolet Spectrometer) instrument will be activated to image Mars’ exospheric hydrogen in the Lyman-beta band. As well as these measurements, Mars Hope will be cross-calibrated with the PHEBUS spectrometer aboard the European Space Agency’s BepiColombo spacecraft, which is en-route to Mercury. The move will allow significant data collection to be made on the distribution of hydrogen within the sun’s heliosphere. This will provide a better understanding on the development of models of the distribution of interplanetary hydrogen.

Variations of Martian Weather

Upon its arrival to mars, the Hope Probe will travel in a 20,000km – 43,000 km elliptical science orbit and will complete one orbit of the planet every 55 hours. As a result of its highly innovative orbit, Hope Probe will take the first ever planet-wide picture of Mars’ atmospheric dynamics and weather.

During this time, the contact period with the Mission Operation Center will be limited to six to eight hours, twice a week and it is expected that the Probe will transfer over one terabyte of novel data on Mars’ atmosphere. In parallel, the instruments that it carries will continue to routinely observe Mars’ surface and atmosphere, so that an understanding of the weather is gained for every point on ground, over every time zone, and through every season. It will also contribute to forming the first complete picture of Martian atmosphere, which will be provided to the global scientific community in more than 200 academic and research institutions.

The Hope Probe carries three tools to measure and study Martian atmosphere, and weighs about 1,350 kg – the size of a small car. It was designed and built by MBRSC engineers in cooperation with global knowledge transfer partners.

Three Teams EMM’s Hope Probe is currently managed and supervised by different teams, each responsible for separate aspects of the Probe’s overall health. The Ground Station Team oversees and monitors the connectivity and data received. The Spacecraft Team is in charge of checking the subsystems’ performance. The Operations Team, for its part, oversees the spacecraft’s operations throughout all phases that include monitoring, controlling (uploading the schedule scripts), status data analysis and performing the TCMs.

Follow the mission’s Journey

With a newly redesigned website, space enthusiasts and the general public can follow the Hope Probe’s journey in real time. Furthermore, the website provides key information on the progress of the mission and the different phases of the journey.



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