The astrometric Gaia-FUN-SSO observation campaign of 99942 Apophis

W. Thuillot*, D. Bancelin, A. Ivantsov, J. Desmars, M. Assafin, S. Eggl, D. Hestroffer, P. Rocher, B. Carry, P. David, L. Abe, M. Andreev, J. E. Arlot, A. Asami, V. Ayvasian, A. Baransky, M. Belcheva, Ph Bendjoya, I. Bikmaev, O. A. BurkhonovU. Camci, A. Carbognani, F. Colas, A. V. Devyatkin, Sh A. Ehgamberdiev, P. Enikova, L. Eyer, A. Galeev, E. Gerlach, V. Godunova, A. V. Golubaev, D. L. Gorshanov, R. Gumerov, N. Hashimoto, M. Helvaci, S. Ibryamov, R. Ya Inasaridze, I. Khamitov, A. Kostov, A. M. Kozhukhov, Y. Kozyryev, Yu N. Krugly, V. Kryuchkovskiy, N. Kulichenko, N. Maigurova, A. Manilla-Robles, A. A. Martyusheva, I. E. Molotov, G. Nikolov, P. Nikolov, K. Nishiyama, S. Okumura, L. Palaversa, O. Parmonov, Q. Y. Peng, S. N. Petrova, G. I. Pinigin, A. Pomazan, J. P. Rivet, T. Sakamoto, N. Sakhibullin, O. Sergeev, A. V. Sergeyev, O. V. Shulga, O. Suarez, Y. Sybiryakova, N. Takahashi, V. Tarady, M. Todd, S. Urakawa, O. Uysal, O. Vaduvescu, V. Vovk, X. L. Zhang

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Aims. Astrometric observations performed by the Gaia Follow-Up Network for Solar System Objects (Gaia-FUN-SSO) play a key role in ensuring that moving objects first detected by ESA's Gaia mission remain recoverable after their discovery. An observation campaign on the potentially hazardous asteroid (99 942) Apophis was conducted during the asteroid's latest period of visibility, from 12/21/2012 to 5/2/2013, to test the coordination and evaluate the overall performance of the Gaia-FUN-SSO. Methods. The 2732 high quality astrometric observations acquired during the Gaia-FUN-SSO campaign were reduced with the Platform for Reduction of Astronomical Images Automatically (PRAIA), using the USNO CCD Astrograph Catalogue 4 (UCAC4) as a reference. The astrometric reduction process and the precision of the newly obtained measurements are discussed. We compare the residuals of astrometric observations that we obtained using this reduction process to data sets that were individually reduced by observers and accepted by the Minor Planet Center. Results. We obtained 2103 previously unpublished astrometric positions and provide these to the scientific community. Using these data we show that our reduction of this astrometric campaign with a reliable stellar catalog substantially improves the quality of the astrometric results. We present evidence that the new data will help to reduce the orbit uncertainty of Apophis during its close approach in 2029. We show that uncertainties due to geolocations of observing stations, as well as rounding of astrometric data can introduce an unnecessary degradation in the quality of the resulting astrometric positions. Finally, we discuss the impact of our campaign reduction on the recovery process of newly discovered asteroids.

Orijinal dilİngilizce
Makale numarasıA59
DergiAstronomy and Astrophysics
Yayın durumuYayınlandı - 1 Kas 2015
Harici olarak yayınlandıEvet

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Publisher Copyright:
© 2015 ESO.


The authors are grateful to several engineers and technicians who punctually participated in this work. W. Thuillot, S. Eggl and D. Hestroffer acknowledge the support of European Union Seventh Framework Program (FP7/2007-2013) under grant agreement no. 282703 (NEOShield project). A. Ivantsov is grateful for the support by Mairie de Paris: Research in Paris 2012. J. Desmars was supported by CNPq grant 161605/2012-5. M.Assafin acknowledges CNPq grants 473002/2013-2, 482080/2009-4 and 308721/2011-0, FAPERJ grant 111.488/2013. We acknowledge CAPES/COFECUB programme ASTRODYN/Te-791-13 for the Brazil-France cooperation. The work performed at the RTT150/ TUBITAK National Observatory in Turkey was funded by the subsidy allocated to Kazan Federal University for the state assignment in the sphere of scientific activities. Q.Y. Peng acknowledges financial support from the National Science Foundation of China with the Grant Nos (11273014 and C1431227). This work is based in part on observations made at Observatoire de Haute Provence (CNRS), France. The authors are also grateful to D. Farnocchia (JPL) for fruitful discussions.

FinansörlerFinansör numarası
European Union Seventh Framework Program
Mairie de Paris
Seventh Framework Programme282703
National Natural Science Foundation of ChinaC1431227, 11273014
Conselho Nacional de Desenvolvimento Científico e Tecnológico161605/2012-5, 308721/2011-0, 473002/2013-2, 482080/2009-4
Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro111.488/2013, RTT150

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