Size and Shape of Jupiter Trojan (2207) Antenor from Stellar Occultations
Librating around the Lagrange L5, the Jupiter’s Trojan (2207) Antenor has been observed in recent years and its rotational light curve suggests it to be a very likely binary asteroid candidate. From stellar occultations, we report results from three events from Europe and North America to estimate t...
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| author | F. S. Ferreira J. I. B. Camargo B. E. Morgado V. F. Peixoto J. Desmars F. Braga-Ribas A. R. Gomes-Júnior B. Sicardy J. L. Ortiz R. Vieira-Martins C. L. Pereira L. Liberato M. Assafin Y. Kilic R. C. Boufleur F. L. Rommel G. Benedetti-Rossi M. V. Banda-Huarca F. Marchis P. Tanga B. Blanc E. Bondoux A. Burnett S. Calavia-Belloc O. Canales-Moreno N. Carlson M. Conjat T. George R. Gonçalves R. Iglesias-Marzoa G. Krannich D. Lafuente-Aznar P. D. Maley J. Marco C. Schnabel D. Shand K. Wagner |
| author_facet | F. S. Ferreira J. I. B. Camargo B. E. Morgado V. F. Peixoto J. Desmars F. Braga-Ribas A. R. Gomes-Júnior B. Sicardy J. L. Ortiz R. Vieira-Martins C. L. Pereira L. Liberato M. Assafin Y. Kilic R. C. Boufleur F. L. Rommel G. Benedetti-Rossi M. V. Banda-Huarca F. Marchis P. Tanga B. Blanc E. Bondoux A. Burnett S. Calavia-Belloc O. Canales-Moreno N. Carlson M. Conjat T. George R. Gonçalves R. Iglesias-Marzoa G. Krannich D. Lafuente-Aznar P. D. Maley J. Marco C. Schnabel D. Shand K. Wagner |
| author_sort | F. S. Ferreira |
| collection | DOAJ |
| description | Librating around the Lagrange L5, the Jupiter’s Trojan (2207) Antenor has been observed in recent years and its rotational light curve suggests it to be a very likely binary asteroid candidate. From stellar occultations, we report results from three events from Europe and North America to estimate the 2D apparent size and shape of Jupiter’s Trojan (2207) Antenor. For the best-fitted ellipse in the sky-plane, we determined that Antenor has a 2D apparent equatorial radius of 54.30 ± 0.99 km at the moment of the occultations, with an apparent oblateness of 0.144 ± 0.051. We highlight the positive detection from 2021 June 12, which shows an intriguing feature that can be interpreted as a very large topographical feature (of about 11 km) of the body or that can provide further evidence that this object is, in fact, a close or contact binary. We also determine astrometric positions, with uncertainties of a few milliarcseconds (mas) for our preferred solutions. |
| format | Article |
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| institution | Kabale University |
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| spelling | doaj-art-55f5800eec85459f99c36391499de13f2025-08-20T04:00:48ZengIOP PublishingThe Astronomical Journal1538-38812025-01-01170316010.3847/1538-3881/adefdcSize and Shape of Jupiter Trojan (2207) Antenor from Stellar OccultationsF. S. Ferreira0https://orcid.org/0000-0002-5879-2173J. I. B. Camargo1https://orcid.org/0000-0002-1642-4065B. E. Morgado2https://orcid.org/0000-0003-0088-1808V. F. Peixoto3https://orcid.org/0000-0002-3319-4548J. Desmars4https://orcid.org/0000-0002-2193-8204F. Braga-Ribas5https://orcid.org/0000-0003-2311-2438A. R. Gomes-Júnior6https://orcid.org/0000-0002-3362-2127B. Sicardy7https://orcid.org/0000-0003-1995-0842J. L. Ortiz8https://orcid.org/0000-0002-8690-2413R. Vieira-Martins9https://orcid.org/0000-0003-1690-5704C. L. Pereira10https://orcid.org/0000-0003-1000-8113L. Liberato11https://orcid.org/0000-0003-3433-6269M. Assafin12https://orcid.org/0000-0002-8211-0777Y. Kilic13https://orcid.org/0000-0001-8641-0796R. C. Boufleur14https://orcid.org/0000-0003-3452-1114F. L. Rommel15https://orcid.org/0000-0002-6085-3182G. Benedetti-Rossi16https://orcid.org/0000-0002-4106-476XM. V. Banda-Huarca17https://orcid.org/0000-0002-2085-9467F. Marchis18https://orcid.org/0000-0001-7016-7277P. Tanga19https://orcid.org/0000-0002-2718-997XB. Blanc20E. Bondoux21A. Burnett22S. Calavia-Belloc23O. Canales-Moreno24N. Carlson25M. Conjat26T. George27R. Gonçalves28https://orcid.org/0000-0001-6097-5297R. Iglesias-Marzoa29G. Krannich30D. Lafuente-Aznar31P. D. Maley32J. Marco33C. Schnabel34D. Shand35K. Wagner36https://orcid.org/0000-0002-4309-6343Observatório Nacional/MCTI , R. General José Cristino 77, CEP 20921-400 Rio de Janeiro—RJ, Brazil ; felipheferreira@on.br; Laboratório Interinstitucional de e-Astronomia—LIneA , Av. Pastor Martin Luther King Jr, 126 Del Castilho, Nova América Offices, Torre 3000/sala 817 CEP: 20765-000, BrazilObservatório Nacional/MCTI , R. General José Cristino 77, CEP 20921-400 Rio de Janeiro—RJ, Brazil ; felipheferreira@on.br; Laboratório Interinstitucional de e-Astronomia—LIneA , Av. Pastor Martin Luther King Jr, 126 Del Castilho, Nova América Offices, Torre 3000/sala 817 CEP: 20765-000, BrazilLaboratório Interinstitucional de e-Astronomia—LIneA , Av. Pastor Martin Luther King Jr, 126 Del Castilho, Nova América Offices, Torre 3000/sala 817 CEP: 20765-000, Brazil; Universidade Federal do Rio de Janeiro—Observatório do Valongo , Ladeira Pedro Antônio 43, CEP 20.080-090 Rio de Janeiro—RJ, BrazilObservatório Nacional/MCTI , R. General José Cristino 77, CEP 20921-400 Rio de Janeiro—RJ, Brazil ; felipheferreira@on.br; Laboratório Interinstitucional de e-Astronomia—LIneA , Av. Pastor Martin Luther King Jr, 126 Del Castilho, Nova América Offices, Torre 3000/sala 817 CEP: 20765-000, Brazil; Universidade Federal do Rio de Janeiro—Observatório do Valongo , Ladeira Pedro Antônio 43, CEP 20.080-090 Rio de Janeiro—RJ, BrazilIMCCE, Observatoire de Paris, PSL Université, Sorbonne Université , Université Lille 1, CNRS UMR 8028, 77 Avenue Denfert-Rochereau 75014, Paris, France; Institut Polytechnique des Sciences Avancées IPSA , 63 Boulevard de Brandebourg, 94200 Ivry-sur-Seine, FranceObservatório Nacional/MCTI , R. General José Cristino 77, CEP 20921-400 Rio de Janeiro—RJ, Brazil ; felipheferreira@on.br; Laboratório Interinstitucional de e-Astronomia—LIneA , Av. Pastor Martin Luther King Jr, 126 Del Castilho, Nova América Offices, Torre 3000/sala 817 CEP: 20765-000, Brazil; Federal University of Technology—Paraná (UTFPR/DAFIS) , Rua Sete de Setembro, 3165, CEP 80230-901, Curitiba, PR, BrazilLaboratório Interinstitucional de e-Astronomia—LIneA , Av. Pastor Martin Luther King Jr, 126 Del Castilho, Nova América Offices, Torre 3000/sala 817 CEP: 20765-000, Brazil; Federal University of Uberlândia (UFU) , Physics Institute, Avenue João Naves de Ávila 2121, Uberlândia, MG 38408-100, BrazilIMCCE, Observatoire de Paris, PSL Université, Sorbonne Université , Université Lille 1, CNRS UMR 8028, 77 Avenue Denfert-Rochereau 75014, Paris, FranceInstituto de Astrofísica de Andalucía (IAA-CSIC) , Glorieta de la Astronomía s/n. 18008-Granada, SpainObservatório Nacional/MCTI , R. General José Cristino 77, CEP 20921-400 Rio de Janeiro—RJ, Brazil ; felipheferreira@on.br; Laboratório Interinstitucional de e-Astronomia—LIneA , Av. Pastor Martin Luther King Jr, 126 Del Castilho, Nova América Offices, Torre 3000/sala 817 CEP: 20765-000, BrazilObservatório Nacional/MCTI , R. General José Cristino 77, CEP 20921-400 Rio de Janeiro—RJ, Brazil ; felipheferreira@on.br; Laboratório Interinstitucional de e-Astronomia—LIneA , Av. Pastor Martin Luther King Jr, 126 Del Castilho, Nova América Offices, Torre 3000/sala 817 CEP: 20765-000, BrazilUniversité Côte d’Azur , Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange, boulevard de l’Observatoire, CS 34229, 06304, Nice Cedex 4, France; UNESP—São Paulo State University , Grupo de Dinâmica Orbital e Planetologia, CEP 12516-410, Guaratinguetá, SP, BrazilLaboratório Interinstitucional de e-Astronomia—LIneA , Av. Pastor Martin Luther King Jr, 126 Del Castilho, Nova América Offices, Torre 3000/sala 817 CEP: 20765-000, Brazil; Universidade Federal do Rio de Janeiro—Observatório do Valongo , Ladeira Pedro Antônio 43, CEP 20.080-090 Rio de Janeiro—RJ, BrazilInstituto de Astrofísica de Andalucía (IAA-CSIC) , Glorieta de la Astronomía s/n. 18008-Granada, Spain; TÜBITAK National Observatory, Akdeniz University Campus , Antalya 07058, TurkeyObservatório Nacional/MCTI , R. General José Cristino 77, CEP 20921-400 Rio de Janeiro—RJ, Brazil ; felipheferreira@on.br; Laboratório Interinstitucional de e-Astronomia—LIneA , Av. Pastor Martin Luther King Jr, 126 Del Castilho, Nova América Offices, Torre 3000/sala 817 CEP: 20765-000, BrazilLaboratório Interinstitucional de e-Astronomia—LIneA , Av. Pastor Martin Luther King Jr, 126 Del Castilho, Nova América Offices, Torre 3000/sala 817 CEP: 20765-000, Brazil; Federal University of Technology—Paraná (UTFPR/DAFIS) , Rua Sete de Setembro, 3165, CEP 80230-901, Curitiba, PR, Brazil; Florida Space Institute , UCF, 12354, Research Parkway, Partnership 1 building, Room 211, Orlando, USALaboratório Interinstitucional de e-Astronomia—LIneA , Av. Pastor Martin Luther King Jr, 126 Del Castilho, Nova América Offices, Torre 3000/sala 817 CEP: 20765-000, BrazilObservatório Nacional/MCTI , R. General José Cristino 77, CEP 20921-400 Rio de Janeiro—RJ, Brazil ; felipheferreira@on.br; Laboratório Interinstitucional de e-Astronomia—LIneA , Av. Pastor Martin Luther King Jr, 126 Del Castilho, Nova América Offices, Torre 3000/sala 817 CEP: 20765-000, Brazil; Universidad Tecnológica del Perú , Arequipa, PeruSETI Institute , Carl Sagan Center, 339 N. Bernardo Avenue, Suite 200, Mountain View, CA, USA; Unistellar , 5 allée Marcel Leclerc, bâtiment B, Marseille, F-13008, FranceUniversité Côte d’Azur , Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange, boulevard de l’Observatoire, CS 34229, 06304, Nice Cedex 4, FranceUnistellar , 5 allée Marcel Leclerc, bâtiment B, Marseille, F-13008, FranceUniversité Côte d’Azur , Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange, boulevard de l’Observatoire, CS 34229, 06304, Nice Cedex 4, FranceUnistellar , 5 allée Marcel Leclerc, bâtiment B, Marseille, F-13008, France; School of Natural Resources and the Environment, University of Arizona , 1064 E Lowell Street, Tucson, AZ 85721, USASabadell Astronomical Association , Carrer Prat de la Riba, s/n, 08206, Sabadell, Catalonia, Spain; Red Astronavarra Sarea de Navarra , Spain; Astrosedetania de Zaragoza , SpainSabadell Astronomical Association , Carrer Prat de la Riba, s/n, 08206, Sabadell, Catalonia, Spain; Red Astronavarra Sarea de Navarra , Spain; Astrosedetania de Zaragoza , SpainInternational Occultation Timing Association (IOTA) , PO Box 7152, WA 98042, USAInternational Occultation Timing Association/European Section , Am Brombeerhag 13, 30459, Hannover, GermanyInternational Occultation Timing Association (IOTA) , PO Box 7152, WA 98042, USAPolytechnic Institute of Tomar , Ci2-Smart Cities Research Center and Unidade Departamental de Matemática e Física (UDMF), 2300, Tomar, PortugalCentro de Estudios de Física del Cosmos de Aragón , Plaza San Juan 1, 44001, Teruel, SpainInternational Occultation Timing Association/European Section , Am Brombeerhag 13, 30459, Hannover, GermanySabadell Astronomical Association , Carrer Prat de la Riba, s/n, 08206, Sabadell, Catalonia, Spain; Red Astronavarra Sarea de Navarra , Spain; Astrosedetania de Zaragoza , SpainInternational Occultation Timing Association (IOTA) , PO Box 7152, WA 98042, USA; NASA Johnson Space Center Astronomical Society , Houston, TX 77058, USAASTER Agrupació Astronòmica Barcelona , Barcelona, SpainSabadell Astronomical Association , Carrer Prat de la Riba, s/n, 08206, Sabadell, Catalonia, Spain; International Occultation Timing Association/European Section , Am Brombeerhag 13, 30459, Hannover, GermanyUnistellar , 5 allée Marcel Leclerc, bâtiment B, Marseille, F-13008, France; Department of Astronomy and Steward Observatory, University of Arizona , 933 N Cherry Avenue, Tucson, AZ 85719, USAUnistellar , 5 allée Marcel Leclerc, bâtiment B, Marseille, F-13008, France; Department of Astronomy and Steward Observatory, University of Arizona , 933 N Cherry Avenue, Tucson, AZ 85719, USALibrating around the Lagrange L5, the Jupiter’s Trojan (2207) Antenor has been observed in recent years and its rotational light curve suggests it to be a very likely binary asteroid candidate. From stellar occultations, we report results from three events from Europe and North America to estimate the 2D apparent size and shape of Jupiter’s Trojan (2207) Antenor. For the best-fitted ellipse in the sky-plane, we determined that Antenor has a 2D apparent equatorial radius of 54.30 ± 0.99 km at the moment of the occultations, with an apparent oblateness of 0.144 ± 0.051. We highlight the positive detection from 2021 June 12, which shows an intriguing feature that can be interpreted as a very large topographical feature (of about 11 km) of the body or that can provide further evidence that this object is, in fact, a close or contact binary. We also determine astrometric positions, with uncertainties of a few milliarcseconds (mas) for our preferred solutions.https://doi.org/10.3847/1538-3881/adefdcSmall Solar System bodiesAsteroidsStellar occultationJupiter trojans |
| spellingShingle | F. S. Ferreira J. I. B. Camargo B. E. Morgado V. F. Peixoto J. Desmars F. Braga-Ribas A. R. Gomes-Júnior B. Sicardy J. L. Ortiz R. Vieira-Martins C. L. Pereira L. Liberato M. Assafin Y. Kilic R. C. Boufleur F. L. Rommel G. Benedetti-Rossi M. V. Banda-Huarca F. Marchis P. Tanga B. Blanc E. Bondoux A. Burnett S. Calavia-Belloc O. Canales-Moreno N. Carlson M. Conjat T. George R. Gonçalves R. Iglesias-Marzoa G. Krannich D. Lafuente-Aznar P. D. Maley J. Marco C. Schnabel D. Shand K. Wagner Size and Shape of Jupiter Trojan (2207) Antenor from Stellar Occultations The Astronomical Journal Small Solar System bodies Asteroids Stellar occultation Jupiter trojans |
| title | Size and Shape of Jupiter Trojan (2207) Antenor from Stellar Occultations |
| title_full | Size and Shape of Jupiter Trojan (2207) Antenor from Stellar Occultations |
| title_fullStr | Size and Shape of Jupiter Trojan (2207) Antenor from Stellar Occultations |
| title_full_unstemmed | Size and Shape of Jupiter Trojan (2207) Antenor from Stellar Occultations |
| title_short | Size and Shape of Jupiter Trojan (2207) Antenor from Stellar Occultations |
| title_sort | size and shape of jupiter trojan 2207 antenor from stellar occultations |
| topic | Small Solar System bodies Asteroids Stellar occultation Jupiter trojans |
| url | https://doi.org/10.3847/1538-3881/adefdc |
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