Fichier:Hera glides past Didymos.jpg
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Description
DescriptionHera glides past Didymos.jpg |
English: Hera is a candidate ESA mission that will be humankind’s first probe to rendezvous with a binary asteroid system, Didymos.
Didymos is a binary asteroid; the primary body has a diameter of around 780 m, whereas the Didymoon secondary body has a diameter of around 160 m and rotates around the main asteroid at a distance of around 1.2 km. Didymoon will be impacted by the NASA DART spacecraft in October 2022. Its orbital velocity is expected to be shifted by around half a millimetre per second, changing its rotation period enough to be measured roughly with Earth-based telescopes. At the same time DART’s collision will also leave a 20-metre-wide crater on Didymoon’s surface. Mapping the shape of this crater will provide unique information to design asteroid deflection missions in future. In addition, it will shed light on the asteroid’s surface properties and internal structure. Is the asteroid a monolithic mass or a rubble pile? Is it composed of large or tiny grains? Is the subsurface composition identical to the surface one? Hera will map Didymoon’s entire surface down to a resolution of a few metres, and the surface surrounding the DART crater down to >10 cm resolution, through a series of daring flybys. It will also map much of the surface of the primary Didymos asteroid, providing crucial scientific data from two asteroids in a single mission. Because Didymoon is in close orbit around Didymos, the change to its orbit will be easier to observe – initially from the ground – compared to performing a comparable test on an individual asteroid. A full picture of the collision and resulting momentum transfer will only become possible once Hera maps the mass of Didymoon to a high level of certainty, which is necessary for scientists’ models of the tiny two-body system. |
Date | |
Source | Hera_glides_past_Didymos |
Auteur | ESA – Science Office |
Conditions d’utilisation
This media was created by the European Space Agency (ESA).
Where expressly so stated, images or videos are covered by the Creative Commons Attribution-ShareAlike 3.0 IGO (CC BY-SA 3.0 IGO) licence, ESA being an Intergovernmental Organisation (IGO), as defined by the CC BY-SA 3.0 IGO licence. The user is allowed under the terms and conditions of the CC BY-SA 3.0 IGO license to Reproduce, Distribute and Publicly Perform the ESA images and videos released under CC BY-SA 3.0 IGO licence and the Adaptations thereof, without further explicit permission being necessary, for as long as the user complies with the conditions and restrictions set forth in the CC BY-SA 3.0 IGO licence, these including that:
See the ESA Creative Commons copyright notice for complete information, and this article for additional details.
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Ce fichier est soumis à la licence Creative Commons Attribution – Partage dans les Mêmes Conditions 3.0 IGO. Attribution: ESA – Science Office, CC BY-SA IGO 3.0
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1 août 2019
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Date et heure | Vignette | Dimensions | Utilisateur | Commentaire | |
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actuel | 25 mai 2020 à 03:57 | 1 920 × 1 080 (243 kio) | Nrco0e | Uploaded a work by ESA – Science Office from Hera_glides_past_Didymos with UploadWizard |
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Date de modification du fichier | 1 août 2019 à 14:39 |
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Identifiant unique du document original | xmp.did:60f83caa-b1d5-c94e-beb1-6b57f2d1e6ca |
Date de la dernière modification des métadonnées | 1 août 2019 à 13:25 |
Date et heure de la numérisation | 1 août 2019 à 13:25 |