Dimorphos orbit determination from mutual events photometry

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F24%3A00582089" target="_blank" >RIV/67985815:_____/24:00582089 - isvavai.cz</a>

Result on the web

<a href="https://hdl.handle.net/11104/0353671" target="_blank" >https://hdl.handle.net/11104/0353671</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3847/PSJ/ad12cf" target="_blank" >10.3847/PSJ/ad12cf</a>

Result language

angličtina

Original language name

Dimorphos orbit determination from mutual events photometry

Original language description

The NASA Double Asteroid Redirection Test spacecraft successfully impacted the Didymos-Dimorphos binary asteroid system on 2022 September 26 UTC. We provide an update to its preimpact mutual orbit and estimate the postimpact physical and orbital parameters, derived using ground-based photometric observations taken from 2022 July to 2023 February. We found that the total change of the orbital period was33.240 +/- 0.072 minutes (all uncertainties are 3 sigma). We obtained the eccentricity of the postimpact orbit to be 0.028 +/- 0.016 and the apsidal precession rate was 7.3 +/- 2.0 degrees day-1 from the impact to 2022 December 2. The data taken later in 2022 December to 2023 February suggest that the eccentricity dropped close to zero or the orbit became chaotic approximately 70 days after the impact. Most of the period change took place immediately after the impact, but in the few weeks following the impact it was followed by an additional change of27-58+19 s or19 +/- 18 s (the two values depend on the approach we used to describe the evolution of the orbital period after the impact-an exponentially decreasing angular acceleration or the assumption of a constant orbital period, which changed abruptly some time after the impact, respectively). We estimate the preimpact Dimorphos-Didymos size ratio was 0.223 +/- 0.012 and the postimpact is 0.202 +/- 0.018, which indicate a marginally significant reduction of Dimorphos' volume by (9 +/- 9)% as the result of the impact.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

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

Publication year

2024

Confidentiality

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

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

1

Country of publishing house

US - UNITED STATES

Number of pages

12

Pages from-to

17

UT code for WoS article

001147010200001

EID of the result in the Scopus database

2-s2.0-85183688532