Eclipses of the inner satellites of Jupiter observed in 2015
E. Saquet,E. Saquet,N. V. Emelyanov,N. V. Emelyanov,François Colas,Jean-Eudes Arlot,Vincent Robert,Vincent Robert,B. Christophe,O. Dechambre +9 more
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In this article, ground-based photometric observations of eclipses of Amalthea (JV) and Thebe (JXIV) by the Galilean moons were recorded during the 2014-2015 campaign of mutual events.Abstract:
During the 2014-2015 campaign of mutual events, we recorded ground-based photometric observations of eclipses of Amalthea (JV) and, for the first time, Thebe (JXIV) by the Galilean moons. We focused on estimating whether the positioning accuracy of the inner satellites determined with photometry is sufficient for dynamical studies. We observed two eclipses of Amalthea and one of Thebe with the 1 m telescope at Pic du Midi Observatory using an IR filter and a mask placed over the planetary image to avoid blooming features. A third observation of Amalthea was taken at Saint-Sulpice Observatory with a 60 cm telescope using a methane filter (890 nm) and a deep absorption band to decrease the contrast between the planet and the satellites. After background removal, we computed a differential aperture photometry to obtain the light flux, and followed with an astrometric reduction. We provide astrometric results with an external precision of 53 mas for the eclipse of Thebe, and 20 mas for that of Amalthea. These observation accuracies largely override standard astrometric measurements. The (O-C)s for the eclipse of Thebe are 75 mas on the X-axis and 120 mas on the Y-axis. The (O-C)s for the total eclipses of Amalthea are 95 mas and 22 mas, along the orbit, for two of the three events. Taking into account the ratio of (O-C) to precision of the astrometric results, we show a significant discrepancy with the theory established by Avdyushev and Ban'shikova in 2008, and the JPL JUP 310 ephemeris.read more
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The photometric observation of the quasi-simultaneous mutual eclipse and occultation between Europa and Ganymede on 22 August 2021
Chu Wing So,Godfrey Ho-ching Luk,Giann On-ching Chung,Po Kin Leung,Kenneith Ho-keung Hui,Jack Lap-chung Cheung,Ka Wo Chan,Edwin Lok-hei Yuen,Lawrence Wai-kwan Lee,Patrick Kai-ip Lau,Gloria Wing-shan Cheung,Prince Chun-lam Chan,Jason C.S. Pun +12 more
TL;DR: In this article , a quasi-simultaneous mutual event (QSME) between Europa and Ganymede was observed with a CCD camera attached to a 300mm telescope at the Hong Kong Space Museum Sai Kung iObservatory.
References
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Determination of the orbits of inner Jupiter satellites
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