A dynamical and observational study of an unstable TNO: 59358 (1999CL 158)
Context. The physical surface properties of a trans-Neptunian Object is believed to be mainly produced as a result of interplay between irradiation from different kinds of cosmic rays and collisions. Objects recently resurfaced by collisions are likely to have very different physical properties from...
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todo:paper_00046361_v466_n2_p749_AlvarezCandal2023-10-03T14:00:19Z A dynamical and observational study of an unstable TNO: 59358 (1999CL 158) Alvarez-Candal, A. Jones, D. Lazzaro, D. Williams, I.P. Melita, M. Kuiper belt Techniques: spectroscopic Cosmic rays Image sensors Infrared imaging Irradiation Orbits Physical properties Surface analysis Chaotic orbit Kuiper belt Planetary surface analysis Context. The physical surface properties of a trans-Neptunian Object is believed to be mainly produced as a result of interplay between irradiation from different kinds of cosmic rays and collisions. Objects recently resurfaced by collisions are likely to have very different physical properties from those of the bulk population. In particular, pristine ices from the interior are expected to be present on the surface. A possible way to identify a trans-Neptunian object that has suffered a major collision is by investigating the lifetime of the orbit near its present location. If the lifetime is very short, a physical encounter is a possible way by which the TNO has evolved into such a short lived orbit. Aims. The goal of this investigation is to search for tracers of a young surface on objects with very short orbital lifetimes in the trans-Neptunian Belt. We are looking for any evidence that indicates that they reached their current unstable orbits through collisions. In particular, we have studied the case of 59358 (1999CL158), a trans-Neptunian object that currently has the most chaotic orbit in the Classical Belt. Methods. By numerically integration its orbit, we estimate that 59358 (1999CL158) has resided near its location for about 10 Myr. We have also obtained a near-infrared spectrum of 59358 (1999CL158) in the region between 1.43-1.96 microns using the near infrared imager and spectrograph, NIRI, at Gemini North 8-m telescope. These NIR observations are of the faintest and smallest TNO so far observed. Results. We present the results of the search of ice-bands, such as CH4 and H2O, having found evidence of the presence of the first mentioned molecule. Conclusions. The detection of methane implies that it must be an abundant component of this object. Methane is also evidence of a young surface, therefore we conclude that it is likely that 59358 (1999CL 158) has experienced a recent collision or collisions. © ESO 2007. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00046361_v466_n2_p749_AlvarezCandal |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Kuiper belt Techniques: spectroscopic Cosmic rays Image sensors Infrared imaging Irradiation Orbits Physical properties Surface analysis Chaotic orbit Kuiper belt Planetary surface analysis |
| spellingShingle |
Kuiper belt Techniques: spectroscopic Cosmic rays Image sensors Infrared imaging Irradiation Orbits Physical properties Surface analysis Chaotic orbit Kuiper belt Planetary surface analysis Alvarez-Candal, A. Jones, D. Lazzaro, D. Williams, I.P. Melita, M. A dynamical and observational study of an unstable TNO: 59358 (1999CL 158) |
| topic_facet |
Kuiper belt Techniques: spectroscopic Cosmic rays Image sensors Infrared imaging Irradiation Orbits Physical properties Surface analysis Chaotic orbit Kuiper belt Planetary surface analysis |
| description |
Context. The physical surface properties of a trans-Neptunian Object is believed to be mainly produced as a result of interplay between irradiation from different kinds of cosmic rays and collisions. Objects recently resurfaced by collisions are likely to have very different physical properties from those of the bulk population. In particular, pristine ices from the interior are expected to be present on the surface. A possible way to identify a trans-Neptunian object that has suffered a major collision is by investigating the lifetime of the orbit near its present location. If the lifetime is very short, a physical encounter is a possible way by which the TNO has evolved into such a short lived orbit. Aims. The goal of this investigation is to search for tracers of a young surface on objects with very short orbital lifetimes in the trans-Neptunian Belt. We are looking for any evidence that indicates that they reached their current unstable orbits through collisions. In particular, we have studied the case of 59358 (1999CL158), a trans-Neptunian object that currently has the most chaotic orbit in the Classical Belt. Methods. By numerically integration its orbit, we estimate that 59358 (1999CL158) has resided near its location for about 10 Myr. We have also obtained a near-infrared spectrum of 59358 (1999CL158) in the region between 1.43-1.96 microns using the near infrared imager and spectrograph, NIRI, at Gemini North 8-m telescope. These NIR observations are of the faintest and smallest TNO so far observed. Results. We present the results of the search of ice-bands, such as CH4 and H2O, having found evidence of the presence of the first mentioned molecule. Conclusions. The detection of methane implies that it must be an abundant component of this object. Methane is also evidence of a young surface, therefore we conclude that it is likely that 59358 (1999CL 158) has experienced a recent collision or collisions. © ESO 2007. |
| format |
JOUR |
| author |
Alvarez-Candal, A. Jones, D. Lazzaro, D. Williams, I.P. Melita, M. |
| author_facet |
Alvarez-Candal, A. Jones, D. Lazzaro, D. Williams, I.P. Melita, M. |
| author_sort |
Alvarez-Candal, A. |
| title |
A dynamical and observational study of an unstable TNO: 59358 (1999CL 158) |
| title_short |
A dynamical and observational study of an unstable TNO: 59358 (1999CL 158) |
| title_full |
A dynamical and observational study of an unstable TNO: 59358 (1999CL 158) |
| title_fullStr |
A dynamical and observational study of an unstable TNO: 59358 (1999CL 158) |
| title_full_unstemmed |
A dynamical and observational study of an unstable TNO: 59358 (1999CL 158) |
| title_sort |
dynamical and observational study of an unstable tno: 59358 (1999cl 158) |
| url |
http://hdl.handle.net/20.500.12110/paper_00046361_v466_n2_p749_AlvarezCandal |
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