| Full text | |
| Author(s): Show less - |
Gomes-Junior, A. R.
[1, 2, 3]
;
Assafin, M.
[1, 2, 4]
;
Braga-Ribas, F.
[1, 5, 6, 7]
;
Benedetti-Rossi, G.
[1, 5, 7]
;
Morgado, B. E.
[1, 5]
;
Camargo, J. I. B.
[1, 5]
;
Vieira-Martins, R.
[1, 2, 5, 4]
;
Desmars, J.
[8, 9]
;
Sicardy, B.
[7]
;
Barry, T.
[10]
;
Campbell-White, J.
[11]
;
Fernandez-Lajus, E.
[12, 13]
;
Giles, D.
[10]
;
Hanna, W.
[14]
;
Hayamizu, T.
[15]
;
Hirose, T.
[15]
;
De Horta, A.
[10]
;
Horvat, R.
[10]
;
Hosoi, K.
[15]
;
Jehin, E.
[16]
;
Kerr, S.
[17, 18]
;
Machado, I, D.
;
Mammana, L. A.
[12, 19]
;
Maybour, D.
[10]
;
Owada, M.
[15]
;
Rahvar, S.
[20]
;
Snodgrass, C.
[21]
Total Authors: 27
|
| Affiliation: Show less - | [1] Lab Interinst & Astron LIneA, Rua Gal Jose Cristino 77, BR-20921400 Rio De Janeiro, RJ - Brazil
[2] Univ Fed Rio de Janeiro, Observ Valongo, Ladeira Pedro Antonio 43, BR-20080090 Rio De Janeiro, RJ - Brazil
[3] Sao Paulo State Univ, UNESP, Grp Dinam Orbital & Planetol, BR-12516410 Guaratingueta, SP - Brazil
[4] IMCCE, Observ Paris, 77 Ave Denfert Rochereau, F-75014 Paris - France
[5] Observ Nacl MCTI, R Gen Jose Cristino 77, BR-20921400 Rio De Janeiro, RJ - Brazil
[6] Univ Tecnol Fed Parana, UTFPR, DAFIS, Rua Sete Setembro 3165, BR-80230901 Curitiba, PR - Brazil
[7] LESIA, Observ Paris, Sect Meudon, 5 Pl Jules Janssen, F-92195 Meudon - France
[8] IPSA, 63 Blvd Brandebourg, F-94200 Ivry - France
[9] UPMC Univ Paris 06, PSL Res Univ, Univ Lille, Sorbonne Univ, CNRS, IMCCE, Observ Paris, 77 Av Denfert Rochereau, F-75014 Paris - France
[10] Western Sydney Univ, Sch Comp Engn & Math, Penrith Observ, Kingswood, NSW 2747 - Australia
[11] Univ Dundee, Sch Sci & Engn, SUPA, Dundee DD1 4HN - Scotland
[12] Univ Nacl La Plata, Fac Ciencias Astron & Geofis, Paseo Bosque S-N, RA-1900 La Plata, Buenos Aires - Argentina
[13] CCT La Plata CONICET UNLP, Inst Astrofis Plata, RA-1900 La Plata, Buenos Aires - Argentina
[14] Royal Astron Soc New Zealand, Occultat Sect, IOTA, Columbia Falls, MT 59912 - USA
[15] Japan Occultat Informat Network, Tokyo - Japan
[16] Univ Liege, Space Sci Technol & Astrophys Res STAR Inst, B-4000 Liege - Belgium
[17] Astron Assoc Queensland, 5 Curtis St, Pimpama, Qld 4209 - Australia
[18] Royal Astron Soc New Zealand, Occultat Sect, POB 3181, Wellington - New Zealand
[19] Complejo Astron El Leoncito CASLEO, Av Espana 1512 Sur, J5402DSP, San Juan - Argentina
[20] Sharif Univ Technol, Dept Phys, POB 11155-9161, Tehran - Iran
[21] Univ Edinburgh, Inst Astron, Royal Observ, Edinburgh EH9 3HJ, Midlothian - Scotland
Total Affiliations: 21
|
| Document type: | Journal article |
| Source: | Monthly Notices of the Royal Astronomical Society; v. 492, n. 1, p. 770-781, FEB 2020. |
| Web of Science Citations: | 0 |
| 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. (AU) | |
| FAPESP's process: | 18/11239-8 - Determination of satellites and rings orbits from analysis of spacecrafts images |
| Grantee: | Altair Ramos Gomes Junior |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |