Shape and spin-state model of tumbling asteroid (319) Leona
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F25%3A10510224" target="_blank" >RIV/00216208:11320/25:10510224 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=m9M9F6vFio" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=m9M9F6vFio</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1051/0004-6361/202554005" target="_blank" >10.1051/0004-6361/202554005</a>
Alternative languages
Result language
angličtina
Original language name
Shape and spin-state model of tumbling asteroid (319) Leona
Original language description
Context. Stellar occultations by asteroids observed from several stations are routinely used to reconstruct the asteroid's sky-plane projections. Together with the asteroid's shape model reconstructed from photometry, such occultations enable us to precisely determine its size and reveal details of its shape. When reducing occultation timings, the usual assumption is that the star has a negligible angular diameter compared to the asteroid, so it is modeled as a point source. The occultation of Betelgeuse (alpha Orionis) by asteroid (319) Leona on 12 December 2023 was a rare exception - the apparent angular diameter of the star was similar to 50 mas, about the same as that of the asteroid. Aims. This work aimed to reconstruct the shape and spin model of asteroid Leona. Then, the projection of that model for the time of the occultation can be computed, which is necessary to interpret the occultation timings and infer valuable information about Betelgeuse itself. Methods. We collected available photometric data of Leona, carried out new observations, and reconstructed a unique convex shape model. Using three other occultations observed in 2023, we scaled this convex model. We also reconstructed an alternative nonconvex model with the same spin parameters and size but showing some surface details that explain better one of the occultations. Results. We confirmed the tumbling rotation state of Leona and uniquely determined the rotation period P-psi = 1172.2 +/- 0.3 h and the precession period P-phi = 314.27 +/- 0.02 h. The volume-equivalent diameter determined by occultations is 59.1 +/- 0.9 km. The reconstructed shape model of Leona enabled us to compute its sky-plane projection for the time of the Betelgeuse occultation. Conclusions. A reliable shape model with accurate dimensions and accurate rotation and precession periods has been reconstructed for slowly tumbling asteroid Leona. It can be used to interpret the observed occultation of Betelgeuse by Leona.
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/GA22-17783S" target="_blank" >GA22-17783S: There is strength in numbers - Exploitation of Unistellar eVscope network of citizen scientiest for the study of asteroids</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Astronomy & Astrophysics
ISSN
0004-6361
e-ISSN
1432-0746
Volume of the periodical
696
Issue of the periodical within the volume
duben
Country of publishing house
FR - FRANCE
Number of pages
9
Pages from-to
A76
UT code for WoS article
001459780300027
EID of the result in the Scopus database
2-s2.0-105007642233