2026-06-27T16:04:19Zhttps://docta.ucm.es/rest/oai/request
oai:docta.ucm.es:20.500.14352/872942023-08-04T00:07:32Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense author Evangelista-Santana, M author Prá, M. de author Carvano, J. M. author Fuente Marcos, C de la author Fuente Marcos. Raúl de author Alarcon, M. R. author Licandro, J. author Lazzaro, D. author Michimani, J. author Pereira, W. author Rondón, E. author Monteiro, F. author Arcoverde, P. author Corrêa, T. author Rodrigues, T. author Paganini-Martins, C. 2023-07-20T08:13:28Z 2023-07-20T08:13:28Z 2023 0035-87111365-2966 10.1093/mnras/stad2111 https://hdl.handle.net/20.500.14352/87294 https://academic.oup.com/mnras/advance-article-abstract/doi/10.1093/mnras/stad2111/7224605 We present an observational and numerical study of the borderline hyperbolic comet C/2021 O3 (PANSTARRS) performed during its recent passage through the inner Solar system. Our observations were carried out at OASI and SOAR between 2021 October and 2022 January, and reveal a low level of activity relative to which was measured for other long-period comets. In addition, we observed a decrease in brightness as the comet got closer to the Sun. Our photometric data, obtained as C/2021 O3 approached perihelion on 2022 April 21, show that the comet was much less active than what is usually expected in the cases of long-period comets, with Afρ values more in line with those of short-period comets (specifically, the Jupiter Family Comets). On the other hand, the observed increase in the value of the spectral slope as the amount of dust in the coma decreased could indicate that the smaller dust particles were being dispersed from the coma by radiation pressure faster than they were injected by possible sublimation jets. The analysis of its orbital evolution suggests that C/2021 O3 could be a dynamically old comet, or perhaps a new one masquerading as a dynamically old comet, with a likely origin in the Solar system. eng Borderline hyperbolic comet C/2021 O3 (PANSTARRS) was fading as it approached the Sun journal article 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