| Full text | |
| Author(s): Show less - |
Morgado, B.
[1, 2, 3, 4]
;
Vieira-Martins, R.
[1, 2, 3, 4]
;
Assafin, M.
[2, 3, 4]
;
Dias-Oliveira, A.
[1, 5, 3, 4]
;
Machado, D. I.
[6, 7]
;
Camargo, J. I. B.
[1, 3, 4]
;
Malacarne, M.
[8]
;
Sfair, R.
[9]
;
Winter, O. C.
[9]
;
Braga-Ribas, F.
[1, 3, 4, 10]
;
Benedetti-Rossi, G.
[1, 3, 4]
;
Boldrin, L. A.
[9]
;
Camargo, B. C. B.
[9]
;
Gaspar, H. S.
[9]
;
Gomes-Junior, A. R.
[9, 1, 2, 3, 4]
;
Miranda, J. O.
[8]
;
de Santana, T.
[9]
;
Trabuco, L. L.
[7]
Total Authors: 18
|
| Affiliation: | [1] Observ Nacl MCTIC, R Gen Jose Cristino 77, BR-20921400 Rio De Janeiro, RJ - Brazil
[2] Observ Valongo UFRJ, Ladeira Pedro Antonio 43, BR-20080090 Rio De Janeiro, RJ - Brazil
[3] Lab Interinst & Astron LIneA, Rua Gal Jose Cristino 77, BR-20921400 Rio De Janeiro, RI - Brazil
[4] INCT E Universo, Rua Gal Jose Cristino 77, BR-20921400 Rio De Janeiro, RI - Brazil
[5] Escola SESC Ensino Medio, Ave Ayrton Senna 5677, BR-22775004 Rio De Janeiro, RJ - Brazil
[6] Univ Estadual Oeste Parana Unioeste, Ave Tarquinio Joslin Santos 1300, BR-85870650 Foz Do Iguacu, PR - Brazil
[7] Polo Astron Casimiro Montenegro Filho FPTI BR, Ave Tancredo Neves 6731, BR-85867900 Foz Do Iguacu, PR - Brazil
[8] Univ Fed Espirito Santo, Ave Fernando Ferrari 514, BR-29075910 Vitoria, ES - Brazil
[9] UNESP Sao Paulo State Univ, Grp Dinam Orbital & Planetol, BR-12516410 Guaratingueta, SP - Brazil
[10] Fed Univ Technol Parana UTFPR DAFIS, Ave Sete Setembro 3165, BR-80230901 Curitiba, Parana - Brazil
Total Affiliations: 10
|
| Document type: | Journal article |
| Source: | Planetary and Space Science; v. 179, DEC 2019. |
| Web of Science Citations: | 0 |
| Abstract | |
Progress in astrometry and orbital modelling of planetary moons in the last decade enabled better determinations of their orbits. These studies need accurate positions spread over extended periods. We present the results of the 2014-2015 Brazilian campaign for 40 mutual events from 47 observed light curves by the Galilean satellites plus one eclipse of Amalthea by Ganymede. We also reanalysed and updated results for 25 mutual events observed in the 2009 campaign. All telescopes were equipped with narrow-band filters centred at 889 nm with a width of 15 nm to eliminate the scattered light from Jupiter. The albedos' ratio was determined using images before and after each event. We simulated images of moons, umbra, and penumbra in the sky plane, and integrated their fluxes to compute albedos, simulate light curves and fit them to the observed ones using a chi-square fitting procedure. For that, we used the complete version of the Oren-Nayer reflectance model. The relative satellite positions mean uncertainty was 11.2 mas ((similar to)35 km) and 10.1 mas ((similar to)31 km) for the 2014-2015 and 2009 campaigns respectively. The simulated and observed ASCII light curve files are freely available in electronic form at the Natural Satellites DataBase (NSDB). The 40/25 mutual events from our 2014-2015/2009 campaigns represent a significant contribution of 17%/15% in comparison with the PHEMU campaigns lead by the IMCCE. Besides that, our result for the eclipse of Amalthea is only the 4(th) such measurement ever published after the three ones observed by the 2014-2015 international PHEMU campaign. Our results are suitable for new orbital/ephemeris determinations for the Galilean moons and Amalthea. (AU) | |
| FAPESP's process: | 11/08171-3 - Orbital dynamics of minor bodies |
| Grantee: | Othon Cabo Winter |
| Support Opportunities: | Research Projects - Thematic Grants |
| 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 |