The Chinese probe Tianwen-1 achieved a historic milestone in space exploration by capturing unprecedented images of the interstellar comet 3I/ATLAS in October. The recording occurred as the cosmic object passed approximately 29 million kilometers from the surface of Marte, setting a significant precedent for monitoring celestial bodies of external origin from the red planet’s orbit. Esta achievement, officially released by Escritório Nacional of Ciência Espacial of China, offers crucial data that adds to international analyzes on the composition and behavior of this unique visitor.
Comet 3I/ATLAS, recognized as the third confirmed object originating from outside Sistema Solar, was initially detected on July 1 using the ATLAS telescope, located on Chile. Sua hyperbolic trajectory, characteristic of objects that are not gravitationally bound to our Sol, confirmed its external origin.
The celestial body moves at an impressive speed of 58 kilometers per second. Observações coordinated by several space agencies around the world are being used to improve models of its trajectory and to reveal its internal and external structure.
Challenges and adaptations in image capture
The Tianwen-1’s HiRIC camera, originally developed to accurately map planetary surfaces, needed to be significantly adapted to track cosmic targets that are both faint and fast. Para To overcome the challenges posed by the comet’s high orbital speed and avoid any type of blur in the images, extremely short exposures were used. Essas sequences, lasting 30 seconds, were further processed with high technology in Pequim to reveal the desired details.
Transmitting the captured data required complex adjustments to the probe’s orientation and the thermal stability of its systems. The resulting images made it possible to identify the comet’s rocky nucleus, with an estimated diameter of 5.6 kilometers, surrounded by a gaseous coma that extends for thousands of kilometers, offering a clear view of its structure.
Composition and characteristics of the object
The detailed images provided by the Tianwen-1 probe reveal that the central nucleus of comet 3I/ATLAS has a reddish tone, a characteristic that suggests the presence of organic dust in its composition. The coma, in turn, exhibits an active process of ice evaporation under intense solar radiation, forming a diffuse cloud of gases and particles around the nucleus.
The comet also has an elongated trail, which extends for approximately 56 thousand kilometers, driven by the pressure of solar radiation. Análises preliminary spectra detected the presence of water ice, carbon dioxide and traces of carbon monoxide, corroborating hypotheses about the composition of interstellar objects.
Global collaborative observations
Agência Espacial Europeia (ESA) also contributed to the study of comet 3I/ATLAS, using the Mars Express and ExoMars probes to record gaseous emissions from the object’s coma. The data collected by European equipment is crucial, as it complements Chinese photographs with varied observation angles, enriching the multidimensional analysis of the comet.
Nasa, through its Mars Reconnaissance Orbiter (MRO), obtained higher resolution images of the comet’s nucleus, providing additional details about its morphology. On October 4, the Perseverance rover unsuccessfully attempted a visual detection of the Martian surface, demonstrating the joint effort of several missions.
Furthermore, the Hope probe of the Emirados Árabes Unidos monitored possible atmospheric impacts caused by the comet’s passage. The combination of all these global observations is significantly refining estimates of the comet’s axial orientation and the non-gravitational forces acting on it.
The Tianwen-1 mission and its legacy
The launch of the Tianwen-1 probe took place in July 2020, with its orbital insertion in February 2021.
The Tianwen-1 orbital platform, equipped with the HiRIC camera, has been fundamental for mapping the polar ice caps and dust distribution on the red planet. The recent extension of its versatility to interstellar astronomy demonstrates the technological capabilities of China, expanding the scope of the mission far beyond its initial goal of Martian exploration.
Insights into the origin of planetary systems
Detailed observation of comet 3I/ATLAS offers valuable insights into the formation of cold protoplanetary disks, suggesting that such structures may have originated in distant regions, possibly close to the center of Via Láctea. The comet’s estimated age, which exceeds that of our own Sol, reveals planetary formation processes that date back to much older eras.
Technical preparations for tracking
Planning for the observation of comet 3I/ATLAS began in September, with complex orbit simulations and analyzes of the object’s low luminosity. Testes Rigorous telemetry testing was conducted to ensure safe and efficient transmission of captured images.
The team of engineers prioritized brief exposures to maximize the comet’s signal, even at a distance of 29 million kilometers. Essa extension of the original Tianwen-1 mission validates and improves protocols for tracking interstellar targets of great scientific importance.
The integration of all probe subsystems allowed real-time data processing throughout the flight period. The results obtained confirm models of cometary activity in interstellar environments, and collaboration with data from missions such as STEREO and SOHO from Nasa improves predictions of hyperbolic trajectories.
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