septembre 24, 2022

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L’orbiteur de reconnaissance de Mars de la NASA prend des photos du rover chinois depuis l’espace

L’atterrisseur chinois Tianwen-1 et le rover Zhurong ont atterri sur Utopia Planetia de Mars le 14 mai 2021 après avoir passé environ trois mois en orbite autour de la planète rouge. Alors que l’Agence spatiale chinoise partageait des images du rover et de la sonde (Y compris une jolie photo de famille capturé par une caméra à distance sans fil),[{ » attribute= » »>NASA’s Mars Reconnaissance Orbiter has been following the rover’s travels from above.

HiRise Tianwen 1 Lander and Zhurong Rover

Tianwen-1 Lander and Zhurong Rover in Southern Utopia Planitia shortly after landing in May 2021. Credit: NASA/JPL/UArizona

Early on in the Zhurong mission, the HiRISE camera on MRO spotted the lander and rover, as seen from orbit. Our lead image is the latest view from HiRISE, showing the rover’s path and new location, letting us follow along on how far the rover has traveled in the 10 months since it landed. This image was acquired on March 11, 2022.

This tweet from the HiRISE teams shows views of various hardware on Mars surface from China’s mission, such as the lander and backshell.

But in this image below shows Zhurong’s entire trip, and if you look closely (click this link to be able to zoom into the image) you can even see the rover tracks. The HiRISE team wrote on their blog that “It’s exact path can be traced from the wheel tracks left on the surface. It has traveled south for roughly 1.5 kilometers (about 1 mile). “ The imaging team has actually added contrast so that the tracks are more visible.  

HiRISE Zhurong Rover Tracks

HiRISE image showing tracks and the most current imaged location of the Zhurong rover. Credit: NASA/JPL/UArizona.

Like most Mars orbiting cameras, HiRISE acquires images in long, thin strips. Because of how the camera detectors are set up — with 10 detectors lined up in an array — each strip covers about 5 kilometers wide. But HiRISE has two extra pairs of detectors on the two middle strips to get color data, so there’s a central color swath about 1 kilometer wide.

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MRO orbits about 316 km (250 miles) above the Martian surface. At this altitude it can take pictures of Mars with resolutions of 0.3 m/pixel (about 1 foot); therefore it can resolve objects less than a meter across. With that type of power, it can spot the various Mars landers and rovers on the surface, including Opportunity, Curiosity, and Perseverance. HiRISE even captured Curiosity and Perseverance as they were descending under parachutes to the surface.

HiRISE Captured Perseverance During Descent to Mars

The Mars 2020 descent stage holding NASA’s Perseverance rover can be seen falling through the Martian atmosphere, its parachute trailing behind, in this image taken on February 18, 2021 by the HiRISE camera on the Mars Reconnaissance Orbiter. Credit: NASA/JPL-Caltech/University of Arizona

Richard Leis, a member of the HiRISE team said on Twitter that because of the amount of territory covered by the HiRISE image strips, it always takes time and skill to spot human-placed artifacts on Mars’ surface:

Originally published on Universe Today.