Hostname: page-component-cd9895bd7-fscjk Total loading time: 0 Render date: 2024-12-24T01:35:41.367Z Has data issue: false hasContentIssue false

Prediction of stellar occultations by distant solar system bodies in the Gaia era

Published online by Cambridge University Press:  07 March 2018

Josselin Desmars
Affiliation:
LESIA, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06, Univ. Paris Diderot, Sorbonne Paris Cité, 5 place Jules Janssen, 92195 Meudon, France, email: [email protected]
Julio Camargo
Affiliation:
Observatório Nacional/MCT, R. General José Cristino 77, RJ 20921-400 Rio de Janeiro, Brazil Laboratório Interinstitucional de e-Astronomia - LIneA, Rua Gal. José Cristino 77, Rio de Janeiro- RJ 20921-400, Brazil
Bruno Sicardy
Affiliation:
LESIA, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06, Univ. Paris Diderot, Sorbonne Paris Cité, 5 place Jules Janssen, 92195 Meudon, France, email: [email protected]
Felipe Braga-Ribas
Affiliation:
Observatório Nacional/MCT, R. General José Cristino 77, RJ 20921-400 Rio de Janeiro, Brazil Federal University of Technology-Paraná (UTFPR/DAFIS), Rua Sete de Setembro, 3165, CEP 80230-901, Curitiba, PR, Brazil Laboratório Interinstitucional de e-Astronomia - LIneA, Rua Gal. José Cristino 77, Rio de Janeiro- RJ 20921-400, Brazil
Roberto Vieira-Martins
Affiliation:
Observatório Nacional/MCT, R. General José Cristino 77, RJ 20921-400 Rio de Janeiro, Brazil Laboratório Interinstitucional de e-Astronomia - LIneA, Rua Gal. José Cristino 77, Rio de Janeiro- RJ 20921-400, Brazil
Marcelo Assafin
Affiliation:
Observatório do Valongo/UFRJ, Ladeira Pedro Antonio 43, RJ 20.080-090 Rio de Janeiro, Brazil
Diane Bérard
Affiliation:
LESIA, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06, Univ. Paris Diderot, Sorbonne Paris Cité, 5 place Jules Janssen, 92195 Meudon, France, email: [email protected]
Gustavo Benedetti-Rossi
Affiliation:
Laboratório Interinstitucional de e-Astronomia - LIneA, Rua Gal. José Cristino 77, Rio de Janeiro- RJ 20921-400, Brazil
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Stellar occultations are a unique technique to access physical characteristics of distant solar system objects from the ground. They allow the measure of the size and the shape at kilometric level, the detection of tenuous atmospheres (few nanobars), and the investigation of close vicinity (satellites, rings) of Transneptunian objects and Centaurs. This technique is made successful thanks to accurate predictions of occultations. Accuracy of the predictions depends on the uncertainty in the position of the occulted star and the object's orbit. The Gaia stellar catalogue (Gaia Collaboration (2017)) now allows to get accurate astrometric stellar positions (to the mas level). The main uncertainty remains on the orbit. In this context, we now take advantage of the NIMA method (Desmars et al.(2015)) for the orbit determination and of the Gaia DR1 catalogue for the astrometry. In this document, we show how the orbit determination is improved by reducing current and some past observations with Gaia DR1. Moreover, we also use more than 45 past positive occultations observed in the 2009-2017 period to derive very accurate astrometric positions only depending on the position of the occulted stars (about few mas with Gaia DR1). We use the case of (10199) Chariklo as an illustration. The main limitation lies in the imprecision of the proper motions which is going to be solved by the Gaia DR2 release.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2018 

References

Altmann, M., Roeser, S., Demleitner, M., Bastian, U., & Schilbach, E., 2017, A&A, 600, L4 Google Scholar
Assafin, M., Camargo, J. I. B., Vieira Martins, R., et al. 2012, A&A, 541, A142 Google Scholar
Camargo, J. I. B., Vieira-Martins, R., Assafin, M., et al. 2014, A&A, 561, A37 Google Scholar
Desmars, J., Camargo, J. I. B., Braga-Ribas, F., et al. 2015, A&A, 584, A96 Google Scholar
Tian, H.-J., Gupta, P., Sesar, B., et al. 2017, arXiv:1703.06278Google Scholar
Zacharias, N., Finch, C., & Frouard, J., 2017, AJ, 153, 166 CrossRefGoogle Scholar
Gaia Collaboration, Brown, A. G. A., Vallenari, A., et al., 2016, A&A, 595, A2 Google Scholar