Surface heterogeneity, physical, and shape model of Near-Earth Asteroid (52768) 1998 OR2
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F24%3A00584081" target="_blank" >RIV/67985815:_____/24:00584081 - isvavai.cz</a>
Result on the web
<a href="https://hdl.handle.net/11104/0353171" target="_blank" >https://hdl.handle.net/11104/0353171</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3847/PSJ/ad1f70" target="_blank" >10.3847/PSJ/ad1f70</a>
Alternative languages
Result language
angličtina
Original language name
Surface heterogeneity, physical, and shape model of Near-Earth Asteroid (52768) 1998 OR2
Original language description
On 2020 April 29, the near-Earth object (52768) 1998 OR2 experienced a close approach to Earth at a distance of 16.4 lunar distances (LD). 1998 OR2 is a potentially hazardous asteroid of absolute magnitude H = 16.04 that can currently come as close to Earth as 3.4 LD. We report here observations of this object in polarimetry, photometry, and radar. Our observations show that the physical characteristics of 1998 OR2 are similar to those of both M- and S-type asteroids. Arecibo's radar observations provide a high radar albedo of sigma OC= 0.29 +/- 0.08, suggesting that metals are present in 1998 OR2 near-surface. We find a circular polarization ratio of mu c = 0.291 +/- 0.012, and the delay-Doppler images show that the surface of 1998 OR2 is a top-shape asteroid with large-scale structures such as large craters and concavities. The polarimetric observations display a consistent variation of the polarimetric response as a function of the rotational phase, suggesting that the surface of 1998 OR2 is heterogeneous. Color observations suggest an X-complex taxonomy in the Bus-DeMeo classification. Combining optical polarization, radar, and two epochs from the NEOWISE satellite observations, we derived an equivalent diameter of D = 1.80 +/- 0.1 km and a visual albedo p v = 0.21 +/- 0.02. Photometric and radar data provide a sidereal rotation period of P = 4.10872 +/- 0.00001 hr, a pole orientation of (332.degrees 3 +/- 5 degrees, 20.degrees 7 +/- 5 degrees), and a shape model with dimensions of (2.08-0.10+0.10,1.93-0.10+0.10,1.60-0.05+0.05) km.
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
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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
2
Country of publishing house
US - UNITED STATES
Number of pages
23
Pages from-to
44
UT code for WoS article
001169019900001
EID of the result in the Scopus database
2-s2.0-85185930063