The 2017 May 20 stellar occultation by the elongated centaur (95626) 2002 GZ32

Author:

Santos-Sanz P1ORCID,Ortiz J L1,Sicardy B2,Benedetti-Rossi G234ORCID,Morales N1,Fernández-Valenzuela E5,Duffard R1,Iglesias-Marzoa R67,Lamadrid J L6,Maícas N6,Pérez L8,Gazeas K9ORCID,Guirado J C1011,Peris V10,Ballesteros F J10,Organero F12,Ana-Hernández L12,Fonseca F12,Alvarez-Candal A3ORCID,Jiménez-Teja Y3,Vara-Lubiano M1,Braga-Ribas F23413,Camargo J I B34,Desmars J1415,Assafin M416,Vieira-Martins R34,Alikakos J17,Boutet M18,Bretton M19,Carbognani A20ORCID,Charmandaris V2122,Ciabattari F23,Delincak P24,Fuambuena Leiva A25,González H26,Haymes T27,Hellmich S28,Horbowicz J29,Jennings M30,Kattentidt B31,Kiss Cs3233ORCID,Komžík R34,Lecacheux J2,Marciniak A29,Moindrot S35,Mottola S28,Pal A32,Paschalis N36,Pastor S37,Perello C3839,Pribulla T344041ORCID,Ratinaud C42,Reyes J A37,Sanchez J18,Schnabel C3839,Selva A3839,Signoret F25,Sonbas E43,Alí-Lagoa V44

Affiliation:

1. Instituto de Astrofísica de Andalucía, IAA-CSIC, Glorieta de la Astronomía s/n, E-18008 Granada, Spain

2. LESIA, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Université, Univ. Paris Diderot, Sorbonne Paris Cité, France

3. Observatório Nacional/MCTIC, Rio de Janeiro - RJ, 20921-400, Brazil

4. Laboratório Interinstitucional de e-Astronomia (LIneA) and INCT do e-Universo, Rio de Janeiro - RJ, 20921-400, Brazil

5. Florida Space Institute, University of Central Florida, Orlando, FL 32826-0650, USA

6. Centro de Estudios de Física del Cosmos de Aragón (CEFCA), 44001 Teruel, Spain

7. Departamento de Astrofísica, Universidad de La Laguna, 38200 San Cristóbal de La Laguna, S/C de Tenerife, Spain

8. Observatorio de Allariz, 32660 Allariz, Orense, Spain

9. Section of Astrophysics, Astronomy and Mechanics, Department of Physics, National and Kapodistrian University of Athens, GR 157 84 Zografou, Athens, Greece

10. Observatori Astronòmic de la Universitat de València, 46980 Paterna, Valencia, Spain

11. Departament d’Astronomia i Astrofísica, Universitat de València, 46100 Burjassot, Valencia, Spain

12. Observatorio Astronómico La Hita, 45850 LaVilla de Don fadrique, Toledo, Spain

13. Federal University of Technology – Paraná (UTFPR/Curitiba), Curitiba - PR, 81280-340, Brazil

14. Institut Polytechnique des Sciences Avancées IPSA, 94200 Ivry-sur-Seine, France

15. IMCCE, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ Paris 06, Univ. Lille, 75014 Paris, France

16. Observatório do Valongo/UFRJ, Rio de Janeiro - RJ, 20080-090, Brazil

17. Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing, National Observatory of Athens, GR-15236, Penteli, Athens, Greece

18. Latrape Observatory, 38500 Toulouse, France

19. Observatoire des Baronnies Provençales, 05150 Moydans, France

20. INAF – Osservatorio di Astrofisica e Scienza dello Spazio (OAS), 40129 Bologna, Italy

21. Department of Physics, University of Crete, GR-71003, Heraklion, Greece

22. Institute of Astrophysics, FORTH, GR-71110, Heraklion, Greece

23. Osservatorio Astronomico di Monte Agliale, Via Cune Motrone, I-55023 Borgo a Mozzano, Italy

24. PDlink Observatory, 022 01 Cadca, Slovakia

25. Télescope Léonard de Vinci, 06633 Antibes, France

26. Observatorio Astronómico de Forcarei (OAF), 36556 Forcarei, Pontevedra, Spain

27. Smithy Observatory, Hill Rise, RG10 9YD Knowl Hill Common, UK, for the British Astronomical Association, UK

28. German Aerospace Center (DLR), Institute of Planetary Research, 12489 Berlin, Germany

29. Astronomical Observatory Institute, Faculty of Physics, A. Mickiewicz University, Sloneczna 36, PL-60-286 Poznań, Poland

30. Hamsey Green Observatory, CR2 9BF London, UK

31. Neutraubling D-93073, Regensburg, Germany

32. Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, Konkoly Thege 15-17, H-1121 Budapest, Hungary

33. ELTE Eötvös Loránd University, Institute of Physics, H-1053 Budapest, Hungary

34. Astronomical Institute, Slovak Academy of Sciences, 059 60 Tatranská Lomnica, Slovakia

35. Observatoire de Puimichel, 04700 Alpes-de-Haute-Provence, France

36. Nunki Observatory, 37002 Skiathos Island, Greece

37. La Murta Observatory – Astromurcia, 30153 La Murta, Murcia, Spain

38. Agrupació Astronòmica de Sabadell, 08206 Sabadell, Barcelona, Spain

39. International Occultation Timing Association–European Section (IOTA-ES), D-30459 Hannover, Germany

40. ELTE Gothard Astrophysical Observatory, Szent Imre h.u. 112, 9700 Szombathely, Hungary

41. MTA-ELTE Exoplanet Research Group, Szent Imre h.u. 112, 9700 Szombathely, Hungary

42. Landehen Observatory, 22400 Landehen, France

43. Department of Physics, University of Adiyaman, 02040 Adiyaman, Turkey

44. Max Planck Institut für extraterrestrische Physik (MPE), 85748 Garching, Germany

Abstract

ABSTRACT We predicted a stellar occultation of the bright star Gaia DR1 4332852996360346368 (UCAC4 385-75921) (mV = 14.0 mag) by the centaur 2002 GZ32 for 2017 May 20. Our latest shadow path prediction was favourable to a large region in Europe. Observations were arranged in a broad region inside the nominal shadow path. Series of images were obtained with 29 telescopes throughout Europe and from six of them (five in Spain and one in Greece) we detected the occultation. This is the fourth centaur, besides Chariklo, Chiron, and Bienor, for which a multichord stellar occultation is reported. By means of an elliptical fit to the occultation chords, we obtained the limb of 2002 GZ32 during the occultation, resulting in an ellipse with axes of 305 ± 17 km × 146 ± 8 km. From this limb, thanks to a rotational light curve obtained shortly after the occultation, we derived the geometric albedo of 2002 GZ32 (pV = 0.043 ± 0.007) and a 3D ellipsoidal shape with axes 366 km × 306 km × 120 km. This shape is not fully consistent with a homogeneous body in hydrostatic equilibrium for the known rotation period of 2002 GZ32. The size (albedo) obtained from the occultation is respectively smaller (greater) than that derived from the radiometric technique but compatible within error bars. No rings or debris around 2002 GZ32 were detected from the occultation, but narrow and thin rings cannot be discarded.

Funder

Ministry of Science, Innovation and Universities

Horizon 2020 Framework Programme

H2020 European Research Council

University of Central Florida

Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro

Conselho Nacional de Desenvolvimento Científico e Tecnológico

Nemzeti Kutatási Fejlesztési és Innovációs Hivatal

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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