The first observed stellar occultations by the irregular satellite Phoebe (Saturn IX) and improved rotational period
We report six stellar occultations by (Saturn IX) Phoebe, an irregular satellite of Saturn, obtained between mid-2017 and mid-2019. The 2017 July 06 event is the first stellar occultation by an irregular satellite ever observed. The occultation chords were compared to a 3D shape model of the satelli...
Guardado en:
Autores principales: | , , , , , , , , , , , , , , , , , , , , , , , , , , |
---|---|
Formato: | Articulo Preprint |
Lenguaje: | Inglés |
Publicado: |
2019
|
Materias: | |
Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/124810 |
Aporte de: |
id |
I19-R120-10915-124810 |
---|---|
record_format |
dspace |
institution |
Universidad Nacional de La Plata |
institution_str |
I-19 |
repository_str |
R-120 |
collection |
SEDICI (UNLP) |
language |
Inglés |
topic |
Ciencias Astronómicas Astronomía occultations planets satellites: individual: Phoebe |
spellingShingle |
Ciencias Astronómicas Astronomía occultations planets satellites: individual: Phoebe Gómes Júnior, A. R. Assafin, M. Braga Ribas, F. Benedetti Rossi, G. Morgado, B. E. Camargo, J. I. B. Vieira Martins, R. Desmars, J. Sicardy, B. Barry, T. Campbell White, J. Fernández Lajús, Eduardo Eusebio Giles, D. Hanna, Walid Hayamizu, T. Hirose, T. De Horta, A. Horvat, R. Hosoi, K. Jehin, E. Kerr, S. Machado, D. I. Mammana, Luis Antonio Maybour, D. Owada, M. Rahvar, S. Snodgrass, C. The first observed stellar occultations by the irregular satellite Phoebe (Saturn IX) and improved rotational period |
topic_facet |
Ciencias Astronómicas Astronomía occultations planets satellites: individual: Phoebe |
description |
We report six stellar occultations by (Saturn IX) Phoebe, an irregular satellite of Saturn, obtained between mid-2017 and mid-2019. The 2017 July 06 event is 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 over 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 $9.27365 \pm 0.00002$ h. From the stellar occultations, we also obtained 6 geocentric astrometric positions in the ICRS as realised by the Gaia-DR2 with uncertainties at the 1-mas level. |
format |
Articulo Preprint |
author |
Gómes Júnior, A. R. Assafin, M. Braga Ribas, F. Benedetti Rossi, G. Morgado, B. E. Camargo, J. I. B. Vieira Martins, R. Desmars, J. Sicardy, B. Barry, T. Campbell White, J. Fernández Lajús, Eduardo Eusebio Giles, D. Hanna, Walid Hayamizu, T. Hirose, T. De Horta, A. Horvat, R. Hosoi, K. Jehin, E. Kerr, S. Machado, D. I. Mammana, Luis Antonio Maybour, D. Owada, M. Rahvar, S. Snodgrass, C. |
author_facet |
Gómes Júnior, A. R. Assafin, M. Braga Ribas, F. Benedetti Rossi, G. Morgado, B. E. Camargo, J. I. B. Vieira Martins, R. Desmars, J. Sicardy, B. Barry, T. Campbell White, J. Fernández Lajús, Eduardo Eusebio Giles, D. Hanna, Walid Hayamizu, T. Hirose, T. De Horta, A. Horvat, R. Hosoi, K. Jehin, E. Kerr, S. Machado, D. I. Mammana, Luis Antonio Maybour, D. Owada, M. Rahvar, S. Snodgrass, C. |
author_sort |
Gómes Júnior, A. R. |
title |
The first observed stellar occultations by the irregular satellite Phoebe (Saturn IX) and improved rotational period |
title_short |
The first observed stellar occultations by the irregular satellite Phoebe (Saturn IX) and improved rotational period |
title_full |
The first observed stellar occultations by the irregular satellite Phoebe (Saturn IX) and improved rotational period |
title_fullStr |
The first observed stellar occultations by the irregular satellite Phoebe (Saturn IX) and improved rotational period |
title_full_unstemmed |
The first observed stellar occultations by the irregular satellite Phoebe (Saturn IX) and improved rotational period |
title_sort |
first observed stellar occultations by the irregular satellite phoebe (saturn ix) and improved rotational period |
publishDate |
2019 |
url |
http://sedici.unlp.edu.ar/handle/10915/124810 |
work_keys_str_mv |
AT gomesjuniorar thefirstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT assafinm thefirstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT bragaribasf thefirstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT benedettirossig thefirstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT morgadobe thefirstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT camargojib thefirstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT vieiramartinsr thefirstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT desmarsj thefirstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT sicardyb thefirstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT barryt thefirstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT campbellwhitej thefirstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT fernandezlajuseduardoeusebio thefirstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT gilesd thefirstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT hannawalid thefirstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT hayamizut thefirstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT hiroset thefirstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT dehortaa thefirstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT horvatr thefirstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT hosoik thefirstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT jehine thefirstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT kerrs thefirstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT machadodi thefirstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT mammanaluisantonio thefirstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT maybourd thefirstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT owadam thefirstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT rahvars thefirstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT snodgrassc thefirstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT gomesjuniorar firstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT assafinm firstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT bragaribasf firstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT benedettirossig firstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT morgadobe firstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT camargojib firstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT vieiramartinsr firstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT desmarsj firstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT sicardyb firstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT barryt firstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT campbellwhitej firstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT fernandezlajuseduardoeusebio firstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT gilesd firstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT hannawalid firstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT hayamizut firstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT hiroset firstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT dehortaa firstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT horvatr firstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT hosoik firstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT jehine firstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT kerrs firstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT machadodi firstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT mammanaluisantonio firstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT maybourd firstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT owadam firstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT rahvars firstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod AT snodgrassc firstobservedstellaroccultationsbytheirregularsatellitephoebesaturnixandimprovedrotationalperiod |
bdutipo_str |
Repositorios |
_version_ |
1764820451164422144 |