Orbital and physical characterization of asteroid Dimorphos following the DART impact
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F24%3A00585247" target="_blank" >RIV/67985815:_____/24:00585247 - isvavai.cz</a>
Result on the web
<a href="https://hdl.handle.net/11104/0353511" target="_blank" >https://hdl.handle.net/11104/0353511</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3847/PSJ/ad26e7" target="_blank" >10.3847/PSJ/ad26e7</a>
Alternative languages
Result language
angličtina
Original language name
Orbital and physical characterization of asteroid Dimorphos following the DART impact
Original language description
The Double Asteroid Redirection Test (DART) mission impacted Dimorphos, the satellite of binary near-Earth asteroid (65803) Didymos, on 2022 September 26 UTC. We estimate the changes in the orbital and physical properties of the system due to the impact using ground-based photometric and radar observations, as well as DART camera observations. Under the assumption that Didymos is an oblate spheroid, we estimate that its equatorial and polar radii are 394 +/- 11 m and 290 +/- 16 m, respectively. We estimate that the DART impact instantaneously changed the along-track velocity of Dimorphos by2.63 +/- 0.06 mm s-1. Initially, after the impact, Dimorphos's orbital period had changed by32.7 minutes +/- 16 s to 11.377 +/- 0.004 hr. We find that over the subsequent several weeks the orbital period changed by an additional 34 +/- 15 s, eventually stabilizing at 11.3674 +/- 0.0004 hr. The total change in the orbital period was33.25 minutes +/- 1.5 s. The postimpact orbit exhibits an apsidal precession rate of 6.7 +/- 0.degrees 2 day-1. Under our model, this rate is driven by the oblateness parameter of Didymos, J 2, as well as the spherical harmonics coefficients, C 20 and C 22, of Dimorphos's gravity. Under the assumption that Dimorphos is a triaxial ellipsoid with a uniform density, its C 20 and C 22 estimates imply axial ratios, a/b and a/c, of about 1.3 and 1.6, respectively. Preimpact images from DART indicate Dimorphos's shape was close to that of an oblate spheroid, and thus our results indicate that the DART impact significantly altered the shape of Dimorphos.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)
Result continuities
Project
<a href="/en/project/GA20-04431S" target="_blank" >GA20-04431S: Physical and dynamical properties of space mission target asteroids, and their evolutionary paths</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
The Planetary Science Journal
ISSN
2632-3338
e-ISSN
2632-3338
Volume of the periodical
5
Issue of the periodical within the volume
3
Country of publishing house
US - UNITED STATES
Number of pages
11
Pages from-to
74
UT code for WoS article
001187444400001
EID of the result in the Scopus database
2-s2.0-85188283733