An Irregular Shape of the Jupiter Trojan (3317) Paris Revealed by Stellar Occultations and Rotational Light Curves

@article{catani2026irregular,
  title = {{An Irregular Shape of the Jupiter Trojan (3317) Paris Revealed by Stellar Occultations and Rotational Light Curves}},
  author = {Luan M Catani and Bruno E Morgado and Eros Gradovski and Pablo Santos-Sanz and Bruno Sicardy and Felipe Braga-Ribas and Gustavo Benedetti-Rossi and Roberto Vieira-Martins and José-Luis Ortiz and Flavia L Rommel and Altair R Gomes-Júnior and Yucel Kilic and Josselin Desmars and Marcelo Assafin and Rodrigo Boufleur and Chrystian L Pereira and Giuliano Margoti and Juan Luis Rizos and Toshio Hirose and Miyoshi Ida and Júlio I B Camargo and Jonatã Arcas-Silva and Viviane F Peixoto and Hélio Dutra and Damya Souami and Rafael Sfair and Thamiris de Santana and Tiago F L L Pinheiro and Luana Liberato and Patrícia B Siqueira and George L Hashimoto and Norihiro Manago and Hideki Yoshihara and David Oesper and Joan Aragonès and David L Aznar and Jerry Bardecker and Kirk Bender and Michel Boutet and Silvia C Belloc and Ricard Casas and Oscar Canales-Moreno and Jean-Louis Dumont and Gregor Krannich and Pierre Le Cam and Arnaud Leroy and Steve Messner and Waldemar Ogłoza and Lionel Rousselot and Carles Schnabel and Julio Spagnotto and Adrianus Verveen},
  journal = {The Astronomical Journal},
  year = {2026},
  month = jul,
  doi = {10.3847/1538-3881/ae88f3},
  url = {https://hal-obspm.ccsd.cnrs.fr/obspm-05805979v1},
  note = {CC BY 4.0},
}

TY  - JOUR
TI  - An Irregular Shape of the Jupiter Trojan (3317) Paris Revealed by Stellar Occultations and Rotational Light Curves
AU  - Luan M Catani
AU  - Bruno E Morgado
AU  - Eros Gradovski
AU  - Pablo Santos-Sanz
AU  - Bruno Sicardy
AU  - Felipe Braga-Ribas
AU  - Gustavo Benedetti-Rossi
AU  - Roberto Vieira-Martins
AU  - José-Luis Ortiz
AU  - Flavia L Rommel
AU  - Altair R Gomes-Júnior
AU  - Yucel Kilic
AU  - Josselin Desmars
AU  - Marcelo Assafin
AU  - Rodrigo Boufleur
AU  - Chrystian L Pereira
AU  - Giuliano Margoti
AU  - Juan Luis Rizos
AU  - Toshio Hirose
AU  - Miyoshi Ida
AU  - Júlio I B Camargo
AU  - Jonatã Arcas-Silva
AU  - Viviane F Peixoto
AU  - Hélio Dutra
AU  - Damya Souami
AU  - Rafael Sfair
AU  - Thamiris de Santana
AU  - Tiago F L L Pinheiro
AU  - Luana Liberato
AU  - Patrícia B Siqueira
AU  - George L Hashimoto
AU  - Norihiro Manago
AU  - Hideki Yoshihara
AU  - David Oesper
AU  - Joan Aragonès
AU  - David L Aznar
AU  - Jerry Bardecker
AU  - Kirk Bender
AU  - Michel Boutet
AU  - Silvia C Belloc
AU  - Ricard Casas
AU  - Oscar Canales-Moreno
AU  - Jean-Louis Dumont
AU  - Gregor Krannich
AU  - Pierre Le Cam
AU  - Arnaud Leroy
AU  - Steve Messner
AU  - Waldemar Ogłoza
AU  - Lionel Rousselot
AU  - Carles Schnabel
AU  - Julio Spagnotto
AU  - Adrianus Verveen
PY  - 2026
DA  - 2026/07/28
JO  - The Astronomical Journal
DO  - 10.3847/1538-3881/ae88f3
UR  - https://hal-obspm.ccsd.cnrs.fr/obspm-05805979v1
AB  - Jupiter Trojans are key remnants of the solar system formation, preserving primordial material and recording the history of planetary migration. We present the first 3D shape model of the Jupiter Trojan (3317) Paris, obtained by combining stellar occultations and rotational light curves. We analyzed 12 occultation events between 2020 and 2022, yielding 27 positive light curves. In addition, we compiled 45 rotational light curves covering ∼8 yr, obtained from observations at the Observatório do Pico dos Dias (OPD-Brazil) and from publicly available databases such as the Asteroid Light Curve Data Exchange Format. Light-curve inversion, combined with occultation constraints, yielded an irregular 3D shape model with an equivalent-volume diameter of 126.2 ± 6.2 km and an equivalent-surface diameter of 131.5 ± 6.5. We refined the rotation period to 7.081013 ± 0.000005 hr, consistent with previous estimates and the spin axis as λ = 100 °.5 ± 1 °.1 and β = 50 °.7 ± 1 °.4. Using the surface-
SN  - 0004-6256
SN  - 1538-3881
ER  -