Improved models for the near-earth asteroids (2100) ra-shalom, (3103) eger, (12711) tukmit, and (161989) cacus

We present 24 new dense light curves of the near-Earth asteroids (3103) Eger, (161989) Cacus, (2100) Ra-Shalom, and (12711) Tukmit, obtained with the Instituto Astrof´ısico Canarias 80 and Telescopio Abierto Remoto 2 telescopes at the Teide Observatory (Tenerife, Spain) during 2021 and 2022, in the framework of projects visible NEAs observations survey and NEO Rapid Observation, Characterization and Key Simulations. The shape models and rotation state parameters (P, λ, β) were computed by applying the light curve inversion method to the new data altogether with the archival data. For (3013) Eger and (161989) Cacus, our shape models and rotation state parameters agree with previous works, though they have smaller uncertainties. For (2100) Ra-Shalom, our results also agree with previous studies. Still, we find that a Yarkovsky–O’Keefe– Radzievskii–Paddack acceleration of υ = (0.223 ± 0.237) × 10−8 rad d−2 slightly improves the fit of the light curves, suggesting that (2100) Ra-Shalom could be affected by this acceleration. We also present for the first time a shape model for (12711) Tukmit, along with its rotation state parameters (P = 3.484900 ± 0.000031 h, λ = 27◦ ± 8◦, β = 9◦ ± 15◦).

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This project hasreceived funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No 870403 NEO Rapid Observation, Characterization, and Key Simulations (NEOROCKS). JL, MRA, and MS-R acknowledge support from the ACIISI, Consejer´ıa de Econom´ıa, Conocimiento y Empleo del Gobierno de Canarias, and the European Regional Development Fund (ERDF) under grant with reference ProID2021010134 and support from the Agencia Estatal de Investigacion del Ministerio de Ciencia e Innovacion (AEI-MCINN) under grant ‘Hydrated Minerals and Organic Compounds in Primitive Asteroids’ with reference PID2020-120464GB-100. Thisreseach was also funded by FICYT (FUNDACION PARA LA INVESTIGACION CIENTIFICA Y TECNICA), grant number SV-PA-21-AYUD/2021/51301, and Plan Nacional by Ministerio de Ciencia, Innovacion´ y Universidades, Spain, grant number MCIU-22-PID2021-127331NB-I00. This article is based on observations made with the Instituto Astrof´ısico Canarias 80 (IAC80) and Telescopio Abierto Remoto 2 (TAR2) telescopes operated on the island of Tenerife by the Instituto de Astrof´ısica de Canarias (IAC) in the Spanish Observatorio del Teide. The work has been funded by HUNOSA through the collaboration agreement with reference SV-21-HUNOSA-2. This work uses data obtained from the Asteroid Lightcurve Data Exchange Format (ALCDEF) data base, which is supported by funding from NASA grant 80NSSC18K0851.