Physical and mutual orbit characteristics of near-Earth binary asteroid (163693) Atira

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F24%3A00600295" target="_blank" >RIV/67985815:_____/24:00600295 - isvavai.cz</a>
Result on the web
<a href="https://hdl.handle.net/11104/0357676" target="_blank" >https://hdl.handle.net/11104/0357676</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3847/PSJ/ad7814" target="_blank" >10.3847/PSJ/ad7814</a>

Result language
angličtina
Original language name
Physical and mutual orbit characteristics of near-Earth binary asteroid (163693) Atira
Original language description
We report physical and mutual orbit characteristics of near-Earth binary asteroid (163693) Atira. Using S-band (2380 MHz, 12.6 cm) radar observations from the Arecibo Observatory and several epochs of lightcurve observations from 2003 to 2019 with SHAPE modeling software, we determine the shape, size, rotational period, and mutual orbit of the primary and secondary components and the density of the primary component. We confirm the primary's sidereal rotation period to be 3.398521 +/- 0.000003 hr, and we find a likely spin axis orientation of ecliptic longitude and latitude (187 degrees,53 degrees) +/- 12 degrees. We find the primary's volume-equivalent diameter to be 4.92 +/- 0.95 km and the secondary's volume-equivalent diameter to be 0.80 +/- 0.30 km. We find the primary component's density to be 1.43 +/- 0.87 g cm-3. We also find that the secondary has a semimajor axis of 7.8 +/- 0.5 km and a sidereal orbital period of 15.577 +/- 0.003 hr based on orbital calculations using delay and Doppler offsets between the primary and secondary and the timing of mutual events observed in lightcurve data. This work represents the first detailed analysis of the shape of an Atira-class asteroid.
Czech name
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Czech description
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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)

Project
<a href="/en/project/GA23-04946S" target="_blank" >GA23-04946S: Study of evolutionary paths of asteroids driven by non-gravitational forces with photometric observations</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

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