The tumbling spin state of (99942) Apophis

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F14%3A10286145" target="_blank" >RIV/00216208:11320/14:10286145 - isvavai.cz</a>
Alternative codes found
RIV/67985815:_____/14:00429293
Result on the web
<a href="http://dx.doi.org/10.1016/j.icarus.2014.01.026" target="_blank" >http://dx.doi.org/10.1016/j.icarus.2014.01.026</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.icarus.2014.01.026" target="_blank" >10.1016/j.icarus.2014.01.026</a>

Result language
angličtina
Original language name
The tumbling spin state of (99942) Apophis
Original language description
Our photometric observations of Asteroid (99942) Apophis from December 2012 to April 2013 revealed it to be in a state of non-principal axis rotation (tumbling). We constructed its spin and shape model and found that it is in a moderately excited Short Axis Mode (SAM) state with a ratio of the rotational kinetic energy to the basic spin state energy E/Eo = 1.024 +/- 0.013. (All quoted uncertainties correspond to 3a.) The greatest and intermediate principal moments of inertia are nearly the same with 1(2)/1(3) = 0.9651(-0.015 ')(+0.009) but the smallest principal moment of inertia is substantially lower with 1(1)/1(3) = 0.61(-0.08)(+0.11); the asteroid's dynamically equivalent ellipsoid is close to a prolate ellipsoid. The precession and rotation periods are P phi = 27.38 +/- 0.07 h and P psi = 263 +/- 6 h, respectively; the strongest observed lightcurve amplitude for the SAM case is in the 2nd harmonic of P1 = (P phi(-1) - P phi(-1))(-1) = 30.56 +/- 0.01 h. The rotation is retrograde w
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BN - Astronomy and celestial mechanics, astrophysics
OECD FORD branch
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Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2014
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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