The first multichord stellar occultation by the trans-Neptunian Binary (82075) 2000 YW134
- 1Instituto de Astrofísica de Andalucía – Consejo Superior de Investigaciones Científicas, Glorieta de la Astronomía S/N, E-18008 Granada, Spain (mvara@iaa.es)
- 2LESIA, Observatoire de Paris, Université PSL, Sorbonne Université, Université de Paris, CNRS, 92190 Meudon, France
- 3Laboratório Interinstitucional de e-Astronomia - LIneA & INCT do e-Universo, Rua Gal. José Cristino 77, Bairro Imperial de São Cristóvão, Rio de Janeiro (RJ), Brazil
- 4UNESP - São Paulo State University, Grupo de Dinâmica Orbital e Planetologia, Guaratinguetá, SP, 12516-410, Brazil
- 5Observatório Nacional/MCTI, Rio de Janeiro (RJ), Brazil, Rua Gal. José Cristino 77, Bairro Imperial de São Cristóvão, Rio de Janeiro (RJ), Brazil
- 6Institut de Mécanique Céleste et de Calcul des Éphémérides, IMCCE, Observatoire de Paris, PSL Research University, CNRS
- 7Federal University of Technology - Paraná (UTFPR / DAFIS), Curitiba, Brazil
- 8TÜBİTAK National Observatory, Akdeniz University Campus, 07058 Antalya, Turkey
- 9Akdeniz University, Department of Space Sciences and Technologies, Antalya, Turkey
- 10Florida Space Institute, University of Central Florida, 12354 Research Parkway, Partnership 1, Orlando, FL, USA
- 11Universidade Federal do Rio de Janeiro, Observatório do Valongo, Rio de Janeiro, Brazil
- 12naXys, University of Namur, 8 Rempart de la Vierge, Namur, B-5000, Belgium
- *A full list of authors appears at the end of the abstract
Trans-Neptunian objects (TNOs) are considered remnants of the solar system formation, and the study of their physical and dynamical properties gives clues about its origin and evolution [1]. A fraction of this population of small bodies is in the form of Trans-Neptunian Binaries (TNBs), firstly discovered two decades ago [2]. Our interest in them has grown since then, as the study of their mutual orbits can lead to a better understanding of the formation and evolution of the protoplanetary disk. Besides, Trans-Neptunian Binaries offer the opportunity to determine the masses of the bodies with great accuracy, which opens the door to determine their bulk densities. On the other hand, stellar occultations permit us to obtain the sizes and shapes of TNOs with accuracies that can almost reach the precision of the measurements from a spacecraft visit. This technique also enables the detection of secondary features like atmospheres, satellites, or rings [3, 4, 5]. So the study of stellar occultations by TNBs leads to the determination of the size, shape, mass, and bulk density of these bodies with unbeatable accuracy.
In this work, we report the first multichord stellar occultation by the TNO (82075) 2000 YW134 and its satellite S/2005 (82075) 1, which took place on 2022 February 23rd over the Gaia EDR3 star 627356458358636544 (mV ~ 17.1 mag). The prediction was based on the Jet Propulsion Laboratory orbit solution JPL#24 [6, 7], which was updated afterward using astrometric data from the 1.5m telescope at Observatorio de Sierra Nevada (OSN, Granada, Spain) and the 1.23m telescope at Calar Alto (CAHA, Almería, Spain).
Seventeen observing sites participated in the event, which resulted in seven positive chords (five on the main body and two on the satellite), eight negative chords, and two sites that could not observe due to bad weather or technical issues.
We fitted an ellipse to the extremities of the positive chords to derive the projected equivalent diameters of the two bodies. The position of the satellite was closer to the nominal JPL ephemeris than that of the main body. On the other hand, the preliminary derived lower limit for the equivalent projected diameter of the satellite is twice the previously estimated size [8]. We are currently analyzing photometric data to combine all the observations to provide an accurate portrait of this binary system.
[1] Morbidelli, A., Levison, H. F., & Gomes, R. 2008, ed. M. A. Barucci, H. Boehnhardt, D. P. Cruikshank, A. Morbidelli, R. Dotson, 275
[2] Veillet, C. et al. 2002, Nature, Volume 416, Issue 6882, pp. 711-713
[3] Ortiz, J. L., Sicardy, B., Braga-Ribas, F., et al. 2012, Nature, 491, 566
[4] Braga-Ribas, F., Sicardy, B., Ortiz, J. L., et al. 2013, ApJ, 773, 26
[5] Ortiz, J.L., Santos-Sanz, P., Sicardy, B., et al. 2017, Nature, 550, 7675, pp. 219-223
[6] https://astro.kretlow.de/stocc/predictions/
[7] https://astro.kretlow.de/stocc/predictions/cetno/1559/
[8] Stephens, Denise C.; Noll, Keith S.; 2006, AJ, 131, 2, pp. 1142-1148
Josselin Desmars [13,6], Stefano Mottola [14], Alfredo Sota [1], Andras Pal [15], Cs. Kalup [15], A. Derekas [15], R. Szakats [15], Cs. Kiss [15], Michal Zejmo, Anna Marciniak [16], Waldemar Ogloza [17], G. Dangl, A. Carbognani [18], G. Stirpe [18], I. Bruni [18], I. Csanyi [19], Jure Skvarc [20], Herman Mikuz [21,22], Stefan Meister [23], Matthieu Conjat [-], Fabrizio Ciabattari [24], S. Donati [24], Gregor Krannich [25] // Affiliations: [13] Institut Polytechnique des Sciences Avancées IPSA, 63 boulevard de Brandebourg, F-94200 Ivry-sur-Seine, France, [14] German Aerospace Center (DLR), Institute of Planetary Research, 12489 Berlin, Germany, [15] Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, H-1121 Budapest, Konkoly Thege Miklos ut 15-17, Hungary, [16] Astronomical Observatory Institute, Faculty of Physics, Adam Mickiewicz University in Poznan, [17] Mt. Suhora Observatory, Pedagogical University of Cracow, [18] Loiano Astronomical Park , INAF - Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, [19] Baja Astronomical Observatory, Hungary, [20] Isaac Newton Group of Telescopes, Santa Cruz de La Palma, Spain, [21] Crni Vrh Observatory, Crni Vrh nad Idrijo, Slovenia, [22] Faculty of Mathematics and Physics, University of Ljubljana, Slovenia, [23] Bülach Observatory, Rotzibuech, 8180 Bülach, Switzerland, [24] Osservatorio Astronomico di Monte Agliale, Via Cune Motrone, Borgo a Mozzano, Italy, [25] Roof Observatory Kaufering, Bavaria, Germany
How to cite: Vara-Lubiano, M., Kretlow, M., Morales, N., Benedetti-Rossi, G., Rommel, F., Ortiz, J. L., Sicardy, B., Vieira-Martins, R., Santos-Sanz, P., Braga-Ribas, F., Camargo, J., Kilic, Y., Fernández-Valenzuela, E., Morgado, B., Ramos Gomes Jr., A., Álvarez-Candal, Á., Lecacheux, J., Assafin, M., Duffard, R., and Souami, D. and the 2000 YW134's occultation team: The first multichord stellar occultation by the trans-Neptunian Binary (82075) 2000 YW134, Europlanet Science Congress 2022, Granada, Spain, 18–23 Sep 2022, EPSC2022-1048, https://doi.org/10.5194/epsc2022-1048, 2022.
