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astro-ph.EP2025
Dynamically New Comet C/2025 D1 (Groeller) with Record Perihelion Distance
Man-To Hui, Robert Weryk, Marco Micheli +5
We studied C/2025 D1 (Groeller), a long-period comet with an unprecedented perihelion distance of 14.1 au, using archival observations. The data reveals that it had been active at…
astro-ph.EP2024
2019 UO: A Transient Trojan of Saturn
Man-To Hui, Paul A. Wiegert, Robert Weryk +5
Saturn has long been the only giant planet in our solar system without any known Trojan members. In this paper, with serendipitous archival observations and refined orbit determina…