@article{aa11131246af447a94acff043495f04b,
title = "The first observed stellar occultations by the irregular satellite Phoebe (Saturn IX) and improved rotational period",
abstract = "We report six stellar occultations by Phoebe (Saturn IX), an irregular satellite of Saturn, obtained between mid-2017 and mid-2019. The 2017 July 6 event was the first stellar occultation by an irregular satellite ever observed. The occultation chords were compared to a 3D shape model of the satellite obtained from Cassini observations. The rotation period available in the literature led to a sub-observer point at the moment of the observed occultations where the chords could not fit the 3D model. A procedure was developed to identify the correct sub-observer longitude. It allowed us to obtain the rotation period with improved precision compared to the currently known value from literature. We show that the difference between the observed and the predicted sub-observer longitude suggests two possible solutions for the rotation period. By comparing these values with recently observed rotational light curves and single-chord stellar occultations, we can identify the best solution for Phoebe's rotational period as 9.27365 ± 0.00002 h. From the stellar occultations, we also obtained six geocentric astrometric positions in the ICRS as realized by the Gaia DR2 with uncertainties at the 1-mas level....",
keywords = "occultations, planets and satellites, individual, Phoebe, Occultations, Planets and satellites: individual: Phoebe",
author = "Gomes-J{\'u}nior, {A. R.} and M. Assafin and F. Braga-Ribas and G. Benedetti-Rossi and Morgado, {B. E.} and Camargo, {J. I. B.} and R. Vieira-Martins and J. Desmars and B. Sicardy and T. Barry and J. Campbell-White and E. Fern{\'a}ndez-Laj{\'u}s and D. Giles and W. Hanna and T. Hayamizu and T. Hirose and {De Horta}, A. and R. Horvat and K. Hosoi and E. Jehin and Machado, {D. I.} and Mammana, {L. A.} and D. Maybour and M. Owada and S. Rahvar and C. Snodgrass",
note = "Funding Information: ARG-J thanks the financial support of Coordenac¸{\~a}o de Aperfeic¸oamento de Pessoal de N{\'i}vel Superior – Brasil (CAPES), Conselho Nacional de Desenvolvimento Cient{\'i}fico e Tecnol{\'o}gico (CNPq), and Fundac¸{\~a}o de Amparo {\`a} Pesquisa do Estado de S{\~a}o Paulo (FAPESP) (proc. 2018/11239-8). MA thanks CNPq (Grants 427700/2018-3, 310683/2017-3, and 473002/2013-2) and Fundac¸{\~a}o Carlos Chagas Filho de Amparo {\`a} Pesquisa do Estado do Rio de Janeiro (FAPERJ) (grant E-26/111.488/2013). FB-R acknowledges CNPq grant 309578/2017-5. GB-R is thankful for the support of CAPES/Brazil and FAPERJ (grant E26/203.173/2016). BM thanks the CAPES/Cofecub-394/2016-05 grant. RV-M acknowledges grants CNPq: 304544/2017-5, 401903/2016-8, Faperj: PAPDRJ-45/2013 and E-26/203.026/2015, CAPES/Cofecub: 2506/2015. JIBC acknowledges CNPq grant 308150/2016-3. Based on observations obtained at the SOAR telescope, which is a joint project of the Minist{\'e}rio da Ci{\^e}ncia, Tecnologia, Inovac¸{\~o}es e Comunicac¸{\~o}es do Brasil, the U.S. National Optical Astronomy Observatory, the University of North Carolina at Chapel Hill (UNC), and Michigan State University (MSU). Based on data obtained at Complejo Astron{\'o}mico El Leoncito, operated under agreement between the Consejo Nacional de Investigaciones Cientf´icas y T{\'e}cnicas de la Rep{\'u}blica Argentina and the National Universities of La Plata, C{\'o}rdoba and San Juan. The work was based on observations made at the Laborat{\'o}rio Nacional de As-trof{\'i}sica (LNA), Itajub{\'a}-MG, Brazil. TRAPPIST-South is funded by the Belgian Fund for Scientific Research under the grant FRFC 2.5.594.09.F. EJ is a Belgian FNRS Senior Research Associates. The work was based on observations made by MiNDSTEp from the Danish 1.54 m telescope at ESO{\textquoteright}s La Silla observatory. This collaboration, as part of the Encelade working group (http://www.is sibern.ch/teams/encelade/), has been supported by the International Space Sciences Institute in Bern, Switzerland. Part of the research leading to these results has received funding from the European Research Council under the European Communitys H2020 (2014– 2020/ERC grant 669416 {\textquoteleft}LUCKY STAR{\textquoteright}) Publisher Copyright: {\textcopyright} 2019 The Author(s).",
year = "2020",
month = feb,
doi = "10.1093/mnras/stz3463",
language = "English",
volume = "492",
pages = "770--781",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "1",
}