Orbital and physical characterization of asteroid Dimorphos following the DART impact

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Orbital and physical characterization of asteroid Dimorphos following the DART impact

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Orbital and physical characterization of asteroid Dimorphos following the DART impact

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

<a href="/cs/project/GA20-04431S" target="_blank" >GA20-04431S: Fyzikální a dynamické vlastnosti asteroidů cílených kosmickými sondami, a jejich evoluční dráhy</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

The Planetary Science Journal

ISSN

2632-3338

e-ISSN

2632-3338

Svazek periodika

5

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

11

Strana od-do

74

Kód UT WoS článku

001187444400001

EID výsledku v databázi Scopus

2-s2.0-85188283733