| Full text | |
| Author(s): Show less - |
Morgado, B.
[1, 2]
;
Benedetti-Rossi, G.
[1, 2]
;
Gomes-Junior, A. R.
[3, 1, 2, 4]
;
Assafin, M.
[2, 4]
;
Lainey, V
[5, 6]
;
Vieira-Martins, R.
[1, 2, 4]
;
Camargo, J. I. B.
[1, 2]
;
Braga-Ribas, F.
[2, 7, 8]
;
Boufleur, R. C.
[1, 2]
;
Fabrega, J.
[9]
;
Machado, I, D.
;
Maury, A.
[9]
;
Trabuco, L. L.
[10]
;
de Barros, J. R.
[11]
;
Cacella, P.
[12]
;
Crispim, A.
[7]
;
Jaques, C.
[11]
;
Navas, G. Y.
[13]
;
Pimentel, E.
[11]
;
Rommel, F. L.
[1, 2, 7]
;
de Santana, T.
[3]
;
Schoenell, W.
[14]
;
Sfair, R.
[3]
;
Winter, O. C.
[3]
Total Authors: 24
|
| Affiliation: Show less - | [1] Observ Nacl Mct, R Gen Jose Cristino 77, BR-20921400 Rio De Janeiro - Brazil
[2] LIneA&INCT E Univ, Lab Interinst & Astron, Rua Gal Jose Cristino 77, BR-20921400 Rio De Janeiro - Brazil
[3] UNESP Sao Paulo State Univ, BR-12516410 Guaratingueta, SP - Brazil
[4] Univ Fed Rio de Janeiro, Observ Valongo, Ladeira Pedro Antonio 43, BR-20080090 Rio de Janeiro - Brazil
[5] CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 - USA
[6] Univ Lille 1, UPMC, Sorbonne Univ, IMCCE, Observ Paris, PSL Res Univ, CNRS UMR 8028, 77 Av Denfert Rochereau, F-75014 Paris - France
[7] Fed Univ Technol Parana UTFPR DAFIS, Av Sete Setembro 3165, BR-80230901 Curitiba, Parana - Brazil
[8] Univ Paris Diderot, Sorbonne Univ, Sorbonne Paris Cite, LESIA, Observ Paris, Univ PSL, CNRS, 5 Pl Jules Janssen, F-92195 Meudon - France
[9] San Pedro Atacama Celestial Explorat, Casilla 21, San Pedro De Atacama - Chile
[10] Machado, D., I, FPTI BR, Polo Astron Casimiro Montenegro Filho, Ave Tancredo Neves 6731, BR-85870650 Foz Do Iguacu, Parana - Brazil
[11] Observ SONEAR, Oliveira, MG - Brazil
[12] Dogsheaven Observ, SMPW Q25 CJ1 LT10B, Brasilia, DF - Brazil
[13] Res Ctr Astron, Francisco J Duarte CIDA 264, Merida 5101A - Venezuela
[14] Univ Fed Rio Grande do Sul, Inst Fis, BR-91501970 Porto Alegre, RS - Brazil
Total Affiliations: 14
|
| Document type: | Journal article |
| Source: | Astronomy & Astrophysics; v. 626, JUN 17 2019. |
| Web of Science Citations: | 1 |
| Abstract | |
Context. Bright stellar positions are now known with an uncertainty below 1 mas thanks to Gaia DR2. Between 2019-2020, the Galactic plane will be the background of Jupiter. The dense stellar background will lead to an increase in the number of occultations, while the Gaia DR2 catalogue will reduce the prediction uncertainties for the shadow path. Aims. We observed a stellar occultation by the Galilean moon Europa (J2) and propose a campaign for observing stellar occultations for all Galilean moons. Methods. During a predicted period of time, we measured the light flux of the occulted star and the object to determine the time when the flux dropped with respect to one or more reference stars, and the time that it rose again for each observational station. The chords obtained from these observations allowed us to determine apparent sizes, oblatness, and positions with kilometre accuracy. Results. We present results obtained from the first stellar occultation by the Galilean moon Europa observed on 2017 March 31. The apparent fitted ellipse presents an equivalent radius of 1561.2 +/- 3.6 km and oblatenesses 0.0010 +/- 0.0028. A very precise Europa position was determined with an uncertainty of 0.8 mas. We also present prospects for a campaign to observe the future events that will occur between 2019 and 2021 for all Galilean moons. Conclusions. Stellar occultation is a suitable technique for obtaining physical parameters and highly accurate positions of bright satellites close to their primary. A number of successful events can render the 3D shapes of the Galilean moons with high accuracy. We encourage the observational community (amateurs included) to observe the future predicted events. (AU) | |
| FAPESP's process: | 16/24561-0 - On the relevance of small bodies in orbital dynamics |
| Grantee: | Othon Cabo Winter |
| Support Opportunities: | Research Projects - Thematic Grants |
| 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 |