Marielle Eduardo (ASIAA); Ying-Tung Chen (ASIAA), Shiang-Yu Wang (ASIAA); Wen-Ping Chen (NCU)
Trans-Neptunian Objects (TNOs) hold the pristine and critical information not only on the composition but also on the collisional evolution of the outer Solar System. However, information for these small and faint TNOs is still limited as observations require telescopes with large aperture and wide field of view. In this study, we utilized the data obtained from the HSC-SSP survey Deep and Ul- tradeep layers, which uses the 8.2m aperture of the Subaru Telescope and 1.77 deg field-of-view of the Hyper Suprime-Cam, from 2014 to 2019. We present 43 candi- date detections, in which 39 (74%) are new discoveries, with magnitude of 21.97 − 25.42 mag and sizes of about 80 − 520 km in diameter. By extending each of the object’s observation arc, we were able to place an accurate measurement of orbital properties and a very good estimate of colors to at least 32 of our TNO candidates and 1 centaur candidate. The intrinsic faintness and seeing-transparency varia- tion during observations primarily constrained us from recovering the remaining 10 detected objects. We found that the color of our remaining TNO candidates is dispersed in a large range but is consistent with the observed reddening trend. However, because of this small sample size, we did not see any correlation of the TNO colors with orbital parameters (semimajor axis, eccentricity, and inclination). Additionally, we find that a large fraction (40%) of our TNO candidates exhibit a large brightness variation of ∆m ≤ 0.40 mag. In contrary to earlier studies, we did not find a correlation between the light curve amplitude and absolute magnitude probably because we did not cover the whole rotation period of the TNOs due to short data span (1-2 hr) in our observations.