Analysis of 25 mutual eclipses and occultations between the Galilean satellites observed from Brazil in 2009★

Dias-Oliveira, A.; Vieira-Martins, R.; Assafin, M.; Camargo, J. I. B.; Braga-Ribas, F.; Neto, D. N. da Silva; Gaspar, H. S.; Santos, P. M. Pires dos; Domingos, R. C.; Boldrin, L. A. G.; Izidoro, André; Carvalho, Jean Paulo dos Santos; Sfair, R.; Sampaio, Jarbas Cordeiro; Winter, O. C.

doi:10.1093/mnras/stt447

Cited by 14 publications

(22 citation statements)

References 23 publications

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“…This flux variation is connected to the relative apparent motion of the satellites in the sky, and thus, ultimately, to their orbits. The apparent relative motion between the satellites under mutual phenomena can be described in terms of the instant of minimum apparent distance (central instant of the event), the minimum apparent distance at this instant (impact parameter), and the relative apparent velocity between one satellite (or shadow) and the other (Emelyanov (2003); Dias-Oliveira et al (2013) and references therein). The particular nature of orbital geometry in mutual phenomena offers valuable constrains in the orbital solutions of the satellites (Lainey et al 2004).…”

Section: Arxiv:160506573v1 [Astro-phep] 21 May 2016mentioning

confidence: 99%

Astrometry of mutual approximations between natural satellites. Application to the Galilean moons

Morgado

Assafin

Vieira-Martins

et al. 2016

Mon. Not. R. Astron. Soc.

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Typically we can deliver astrometric positions of natural satellites with errors in the 50-150 mas range. Apparent distances from mutual phenomena, have much smaller errors, less than 10 mas. However, this method can only be applied during the equinox of the planets. We developed a method that can provide accurate astrometric data for natural satellites -the mutual approximations. The method can be applied when any two satellites pass close by each other in the apparent sky plane. The fundamental parameter is the central instant t 0 of the passage when the distances reach a minimum.We applied the method for the Galilean moons. All observations were made with a 0.6 m telescope with a narrow-band filter centred at 889 nm with width of 15 nm which attenuated Jupiter's scattered light. We obtained central instants for 14 mutual approximations observed in 2014-2015. We determined t 0 with an average precision of 3.42 mas (10.43 km). For comparison, we also applied the method for 5 occultations in the 2009 mutual phenomena campaign and for 22 occultations in the 2014-2015 campaign. The comparisons of t 0 determined by our method with the results from mutual phenomena show an agreement by less than 1-sigma error in t 0 , typically less than 10 mas. This new method is particularly suitable for observations by small telescopes.

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Section: Arxiv:160506573v1 [Astro-phep] 21 May 2016mentioning

confidence: 99%

Astrometry of mutual approximations between natural satellites. Application to the Galilean moons

Morgado

Assafin

Vieira-Martins

et al. 2016

Mon. Not. R. Astron. Soc.

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“…From April to October of 2009, 25 light curves for 25 mutual events between the Galilean moons, 13 occultations and 12 eclipses, were observed by our group with the 60 cm Zeiss telescope of the Observatório Pico dos Dias (OPD) using the methane filter. These events were analysed by Dias- Oliveira et al (2013) and by Arlot et al (2014a). However, the results obtained by both presented a significant difference (higher than 3 ).…”

Section: Results Of the Mutual Phenomena Campaigns 41 Re-analysis Omentioning

confidence: 99%

“…In the simulations of occultations and eclipses, we used the same geometric relations described in detail in Dias-Oliveira et al (2013).…”

Section: Simulating Light Curvesmentioning

confidence: 99%

“…We took a somewhat different approach from that in Dias-Oliveira et al (2013). Here, the parameters of interest were determined by the minimisation of the Chi-square test, Eq.…”

Section: Fitting Proceduresmentioning

confidence: 99%

“…The photometry of these events offers a reliable source of very precise relative positions between two satellites. They often achieve uncertainties bellow 5 mas (∼ 15 km) (Emelyanov, 2009;Dias-Oliveira et al, 2013;Arlot et al, 2014a;Saquet et al, 2018). These relative positions can constrain the orbital studies of these moons and give us hints about their structure and formation processes (Lainey et al, 2004b,a, ⋆ Based in part on observations made at the Laboratório Nacional de Astrofísica (LNA), Itajubá-MG, Brazil.…”

Section: Introductionmentioning

confidence: 99%

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The 2014–2015 Brazilian mutual phenomena campaign for the Jovian satellites and improved results for the 2009 events

Morgado

Vieira-Martins

Assafin

et al. 2019

Planetary and Space Science

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A B S T R A C TProgress 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 (∼35 km) and 10.1 mas (∼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 ℎ 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.

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The photometric observation of the quasi-simultaneous mutual eclipse and occultation between Europa and Ganymede on 22 August 2021

Luk

Chung

et al. 2023

Icarus

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Analysis of 25 mutual eclipses and occultations between the Galilean satellites observed from Brazil in 2009★

Cited by 14 publications

References 23 publications

Astrometry of mutual approximations between natural satellites. Application to the Galilean moons

Astrometry of mutual approximations between natural satellites. Application to the Galilean moons

The 2014–2015 Brazilian mutual phenomena campaign for the Jovian satellites and improved results for the 2009 events

The photometric observation of the quasi-simultaneous mutual eclipse and occultation between Europa and Ganymede on 22 August 2021

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