Secular change in the spin states of asteroids due to radiation and gravitation torquesNew detections and updates of the YORP effect

0584411 - ASÚ 2025 RIV FR eng J - Journal Article
Ďurech, J. - Vokrouhlický, D. - Pravec, Petr - Fatka, Petr - Hornoch, Kamil - Kučáková, Hana - Kušnirák, Peter … Total 24 authors
Secular change in the spin states of asteroids due to radiation and gravitation torquesNew detections and updates of the YORP effect.
Astronomy & Astrophysics. Roč. 682, February (2024), č. článku A93. ISSN 0004-6361. E-ISSN 1432-0746
R&D Projects: GA ČR(CZ) GA20-04431S; GA ČR(CZ) GA23-04946S
Institutional support: RVO:67985815
Keywords : near-earth asteroids * 2100 ra-shalom * spectroscopic survey
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 6.5, year: 2022
Method of publishing: Open access

Direct observational evidence of the YORP effect is the primary goal of our work. This includes both the YORP detection for new objects and an improvement in the accuracy of previously known detections. We carried out photometric observations of five nearEarth asteroids: (1862) Apollo, (2100) Ra-Shalom, (85989) 1999 JD6, (138852) 2000 WN10, and (161989) Cacus. Then we applied the lightcurve inversion method to all available data to determine the spin state and a convex shape model for each of the five studied asteroids. The YORP effect was modeled as a linear change of the rotation frequency upsilon equivalent to d omega/dt. In the case of (2100) Ra-Shalom, the analysis required that the spinaxis precession due to the solar gravitational torque also be included. We obtained two new detections of the YORP effect: (i) upsilon = (2.9 +/- 2.0) x 10(-9) rad d(-2) for (2100) Ra-Shalom, and (ii) upsilon = (5.5 +/- 0.7) x 10(-8) rad d(-2) for (138852) 2000 WN10.
Permanent Link: https://hdl.handle.net/11104/0353172