Bem-vindos! Benvenuti! Welcome! ようこそ！
patryksan@gmail.com or patryk@socio.kindai.ac.jp
→ UPDATEDCURRICULUM VITAE (pdf)Nov/2025
https://twitter.com/P_SofiaLykawka
NEWS🗣️
→ The discovery of 2023 KQ14 "Ammonite" has been announced! Ammonite is a new Sedna-like object with the 3rd largest perihelion distance in the solar system. The details are summarized in Paper 2 below. News release: https://newscast.jp/news/2541903 (In Japanese. Please check my X account above for the details in English).
→ New paper about forming the four terrestrial planets in the solar system! (2024) (Paper 5 below). This is a follow-up study of the JSCE scenario, which has profound implications for the formation of terrestrial planets and the asteroid belt.
→ The discovery of two new moons of Neptune has been announced! The details are summarized in Paper 3 below. News release: https://newscast.jp/news/6468057 (In Japanese. Please check my X account above for the details in English).
→ Please check KBP (←click) for more information about the Kuiper Belt Planet scenario (a hypothetical planet in the distant outer solar system first proposed in 2008 and recently revisited/improved in Paper 6).
RESEARCH
Origin and evolution of the Solar System
Physics and dynamics of trans-Neptunian objects - TNOs (or Edgeworth-Kuiper Belt objects - EKBOs), asteroids, Centaurs, Trojans, comets, and other solar system minor bodies
Terrestrial planet formation
Planet migration
Orbital resonances
Papers - latest 10 publications
1. Chang C.-K., Chen Y.-T., Lehner M. J., (...), Lykawka P. S., et al. 2025. FOSSIL. IV. The Significance-convergence Test—An Algorithm for Selecting Reliable Rotation Periods of Small Solar System Bodies. Publications of the Astronomical Society of the Pacific 137:104509.🆕
https://iopscience.iop.org/article/10.1088/1538-3873/ae0eee
2. Chen Y.-T., Lykawka P. S., Huang Y., et al. 2025. Discovery and dynamics of a Sedna-like object with a perihelion of 66 au. Nature Astronomy 9, 1309-1316.🆕
https://www.nature.com/articles/s41550-025-02595-7
3. Sheppard S., Tholen D., Brozovic M., (...), Lykawka P. S., et al. 2024. New Moons of Uranus and Neptune from Ultra-Deep Pencil Beam Surveys. The Astronomical Journal, 168:258 (16 pp).🆕
https://iopscience.iop.org/article/10.3847/1538-3881/ad7fed
4. Fraser W. C., Porter S. B., Peltier L., (...), Lykawka P. S., et al. 2024. Candidate Distant Trans-Neptunian Objects Detected by the New Horizons Subaru TNO Survey. The Planetary Science Journal 5:227 (20 pp).🆕
https://iopscience.iop.org/article/10.3847/PSJ/ad6f9e
5. Lykawka P. S., Ito T. 2024. Formation of the four terrestrial planets in the Jupiter-Saturn chaotic excitation scenario: fundamental properties and water delivery. Icarus 416:116098.🆕
https://doi.org/10.1016/j.icarus.2024.116098
6. Lykawka P. S., Ito T. 2023. Is there an Earth-like planet in the distant Kuiper Belt? The Astronomical Journal 166:118 (20 pp).🆕
https://iopscience.iop.org/article/10.3847/1538-3881/aceaf0
7. Ashton E., Chang C.-K., Chen Y.-T., (...), Lykawka P. S., et al. 2023. FOSSIL. III. Lightcurves of 371 Trans-Neptunian Objects. The Astrophysical Journal Supplement Series 267:33 (13pp).
https://iopscience.iop.org/article/10.3847/1538-4365/acda1e
8. Lykawka P. S., Ito T. 2023. Terrestrial planet and asteroid belt formation by Jupiter-Saturn chaotic excitation. Scientific Reports 13:4708 (14pp + detailed supplementary information).
https://www.nature.com/articles/s41598-023-30382-9
9. Chang C.-K., Chen Y.-T., Fraser W. C., (...), Lykawka P. S., et al. 2022. FOSSIL. II. The Rotation Periods of Small-sized Hilda Asteroids. The Astrophysical Journal Supplement Series 259:7 (8pp).
https://iopscience.iop.org/article/10.3847/1538-4365/ac50ac
10. Chang C.-K., Chen Y.-T., Fraser W. C., (...), Lykawka P. S., et al. 2021. FOSSIL. I. The Spin Rate Limit of Jupiter Trojans. The Planetary Science Journal 2:191.
https://iopscience.iop.org/article/10.3847/PSJ/ac13a4/meta
Please see my CV, NASA/ADS, or Google Scholar for the total records.
Outreach and public releases
🏆For details about outreach and public activities, please refer to my CV.
LINKS
Formation of the Outer Solar System: An Icy Legacy (FOSSIL) - https://fossil-survey.org/
Asteroids Dynamic Site (AstDyS-2) - https://newton.spacedys.com/astdys/
Atlas of Mean Motion Resonances (by Prof. Tabare Gallardo) - https://sites.google.com/view/mmresonances/