TL;DR
Prime made for students and young adults
- Fast, free delivery for dorm and study essentials
- Prime Video and Amazon Music included
- Member-only deals
The European Space Agency’s Hera mission is due to arrive at the Didymos asteroid system in November to study Dimorphos, the moonlet struck by NASA’s DART spacecraft in 2022. Its close-up survey is intended to clarify how the impact changed Dimorphos and examine broader questions about asteroid structure and history.
The European Space Agency’s Hera spacecraft is due to reach the Didymos asteroid system during November to inspect the site where NASA’s DART probe struck the smaller asteroid Dimorphos in 2022. The mission will measure the impact’s aftermath and investigate 10 open questions about asteroids, work that could help scientists evaluate kinetic impact as a planetary-defence method.
Hera is heading for Dimorphos, about 151 metres across, which orbits the larger, roughly 780-metre Didymos. NASA’s DART spacecraft hit Dimorphos on 26 September 2022. The impact changed the moonlet’s orbit, making it the first object in the Solar System whose orbit was altered by human action, according to the source material.
Observations from distant Earth-based telescopes showed a brightening after the collision, but they did not reveal the close-up condition of the asteroid or fully explain how the impact changed it. Hera is intended to conduct a close-range survey of the crash site, gathering data needed to interpret the experiment and assess how an impact can deflect an asteroid.
The supplied ESA report frames the mission as both a planetary-defence investigation and an opportunity for asteroid science. It says Hera will explore 10 outstanding mysteries, reflecting questions raised by earlier spacecraft encounters with asteroids, which have shown them to be dynamic bodies with complex histories. The source does not enumerate the 10 questions, so their individual subject areas cannot be confirmed from the material provided.
Testing Asteroid Deflection in Detail
DART demonstrated that a spacecraft can alter an asteroid’s orbit, but interpreting that result requires knowing what happened at the target. Hera’s measurements are intended to connect the impact itself with Dimorphos’s physical response. That evidence matters because the effectiveness of a kinetic impact depends on how an asteroid absorbs and redistributes momentum, not simply on whether a spacecraft can reach it.
The mission’s findings could improve scientific models used to assess a future deflection attempt. They may also help researchers understand the range of structures and histories found among asteroids. However, the report describes the work as data-gathering and investigation; it does not claim that Hera will settle every question or establish a ready-to-use defence system.
Popular right now
Bose QuietComfort True Wireless Earbuds with Active Noise Cancellation, Black
Bose QuietComfort Headphones (2nd Gen), Wireless Over-Ear Noise-Cancelling Headphones, Hazelnut Taupe
KitchenAid Artisan 5-Quart Tilt-Head Stand Mixer, Almond Cream
As an affiliate, we earn on qualifying purchases.
From DART’s Strike to Hera’s Survey
The two missions form a sequence. DART performed the impact in September 2022, while Hera is travelling to examine the result at close range. Earth-based observations detected changes after the collision, including a brightening, but observations at a distance could not provide the detailed view of the impact area that a visiting spacecraft can seek.
Didymos and Dimorphos are a paired system: the smaller Dimorphos circles the larger Didymos. That arrangement gives scientists a setting in which to study the effects of the collision on an orbiting asteroid moonlet. ESA describes Hera as its first planetary-defence mission. The mission’s stated purpose is to gather information about the kinetic-impact approach while also investigating scientific enigmas about asteroids.
What Hera Still Needs to Measure
The source says researchers do not yet know what the DART impact did to Dimorphos itself in the detail Hera is meant to establish. It also does not specify the individual 10 mysteries named in the report’s title, describe the instruments or planned measurements for each, or provide expected results. Those details should not be inferred from the headline alone.
The supplied report says Hera will arrive during November but does not identify the year in the text. It also gives no confirmed arrival date or account of the spacecraft’s status beyond saying it is headed to the target. The results of the close-up survey remain unknown until observations are made and analysed.
Hera’s Arrival and Close Survey
The next milestone described by ESA is Hera’s arrival at the Didymos system during November. The spacecraft is then expected to study Dimorphos and the DART crash site at close range. Its observations are intended to provide the physical detail missing from distant telescope views and help researchers interpret how the impact changed the target.
After arrival, the scientific value will depend on what Hera measures and how those observations are compared with DART’s earlier results. The source material does not give a schedule for specific investigations, the release of findings, or the timing of any final assessment of the deflection method.
Key Questions
What is Hera going to study?
Hera will investigate Dimorphos and the site of DART’s 2022 impact, while examining asteroid science questions identified by ESA.
What are Dimorphos and Didymos?
Dimorphos is a roughly 151-metre asteroid that orbits Didymos, its larger parent body, which is about 780 metres across.
What did NASA’s DART mission do?
DART struck Dimorphos on 26 September 2022 and changed its orbit, according to the source material. The impact was a test of kinetic impact as a way to deflect an asteroid.
Why can’t telescopes answer all the questions?
Earth-based telescopes observed a brightening after the collision, but the supplied report says the close-up condition of Dimorphos remains unknown. Hera is intended to survey the impact site directly.
When will Hera arrive?
The ESA source says Hera is expected to arrive during November. It does not state a specific arrival day, and the supplied text does not identify the year.
Source: esa.int
