AI 中文总结
本研究对LSST发现的3颗大型轨道TNOs开展CFHT第二次冲日恢复观测，发现2个目标半长轴下降约3-10倍，属海王星3:2共振冥族小天体，提醒学界需多冲日数据验证TNO轨道。
AI 中文摘要
我们报告了对3颗大型轨道海王星外天体（TNOs）的2026年加拿大-法国-夏威夷望远镜（CFHT）第二次冲日恢复观测，这些天体是维拉·C·鲁宾望远镜的时空遗产巡天（LSST）在2025年初步观测中发现的。由于其潜在的科学价值，我们选取了3颗根据LSST短弧（≤0.2年）观测结果显示标称半长轴可能大于100天文单位的TNOs，这三个目标为2025 LS2、2025 ME278、2025 MX348，它们的发现冲日轨道观测质量因观测时长和分布而异。其中2个目标的2026年CFHT恢复观测显示，半长轴下降了约3-10倍，且该天体似乎是与海王星处于3:2平均运动共振的（常见）冥族小天体。我们讨论了轨道要素估计值的演变方式及原因，并再次提醒学界，在获得多冲日恢复观测结果前，应对不寻常的TNO轨道持怀疑态度。
英文摘要
We report 2026 CFHT second-opposition recovery observations of three large-orbit Trans-Neptunian Objects (TNOs) discovered by the Vera C. Rubin Telescope's Legacy Survey of Space and Time (LSST) during preliminary observations in 2025. Due to their potential scientific interest, we selected three TNOs whose nominal semimajor axis could be larger than 100~au according to their short-arc ($\leq0.2$-yr) LSST observations. These three targets (2025 LS2, 2025 ME278, 2025 MX348) had discovery opposition orbits of varying observation quality (in terms of the duration and distribution of observations). In two cases, the 2026 CFHT recoveries showed that the semimajor axis dropped by a factor of $\simeq$3-10, and that the object appears to be a (common) plutino in the 3:2 mean-motion resonance with Neptune. We discuss how and why the estimated orbital elements evolved, and re-caution the community to be skeptical of unusual TNO orbits until they have multi-opposition recoveries.
Comments5 pages, 1 table, submitted 2026 07 31
