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Amalthea

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J E Arlot – 1st expert on this subject based on the ideXlab platform

  • ccd astrometric observations of Amalthea and thebe in the gaia era
    Monthly Notices of the Royal Astronomical Society, 2017
    Co-Authors: V. Robert, F. Colas, E. Saquet, J E Arlot

    Abstract:

    In the framework of the 2014-2015 campaign of mutual events, we observed Jupiter’s inner satellites Amalthea (JV) and Thebe (JXIV). We focused on estimating whether the positioning accuracy determined from direct astrometry could compete with that derived from photometric observations of eclipses, for dynamical purposes. We present the analysis of 35 observations of Amalthea and 19 observations of Thebe realized with the 1-m telescope at Pic du Midi observatory during three nights in 2015, January and April. The images were reduced through an optimal process that includes image and spherical corrections using the Gaia-DR1 catalog to provide the most accurate equatorial (RA, Dec) positions. We compared the observed positions of both satellites with the theoretical positions from JPL JUP310 satellite ephemerides and from IMCCE INPOP13c planetary ephemeris. The rms (O-C) in equatorial positions are ±112 mas for the Amalthea observations, or 330 km at Jupiter, and ±90 mas for the Thebe observations, or 270 km at Jupiter. Using the Gaia-DR1 catalog allowed us to eliminate systematic errors due to the star references up to 120 mas, or 350 km at Jupiter, by comparison with the UCAC4 catalog.

  • Eclipses of the inner satellites of Jupiter observed in 2015
    Astronomy and Astrophysics, 2016
    Co-Authors: E. Saquet, J E Arlot, N. V. Emelyanov, F. Colas, V. Robert, B. Christophe, O. Dechambre

    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.

  • Mutual phenomena involving J5 Amalthea in 2002–2003
    Astronomy and Astrophysics, 2002
    Co-Authors: F Vachier, J E Arlot, W Thuillot

    Abstract:

    Every six years mutual eclipses and occultations occur among the Jovian system of satellites. Very accurate astrometric measurements and several physical characteristics of the surfaces can be infered from their observation. This paper is provide predictions of this type of events involving the fifth satellite J5 Amalthea, spanning from November 2002 to June 2003 and to urge astronomers to observe them. Only the predictions of the eclipses of Amalthea by Io are presented, when the distance between Amalthea-Io and Amalthea-Jutpiter is large enough for photometric purposes. A full list of phenomena is available on the server http://www.imcce.fr/Phemu03/phemu03_eng.html.

W Thuillot – 2nd expert on this subject based on the ideXlab platform

  • Mutual phenomena involving J5 Amalthea in 2002–2003
    Astronomy and Astrophysics, 2002
    Co-Authors: F Vachier, J E Arlot, W Thuillot

    Abstract:

    Every six years mutual eclipses and occultations occur among the Jovian system of satellites. Very accurate astrometric measurements and several physical characteristics of the surfaces can be infered from their observation. This paper is provide predictions of this type of events involving the fifth satellite J5 Amalthea, spanning from November 2002 to June 2003 and to urge astronomers to observe them. Only the predictions of the eclipses of Amalthea by Io are presented, when the distance between Amalthea-Io and Amalthea-Jutpiter is large enough for photometric purposes. A full list of phenomena is available on the server http://www.imcce.fr/Phemu03/phemu03_eng.html.

  • mutual phenomena involving j5 Amalthea in 2002 2003
    Astronomy and Astrophysics, 2002
    Co-Authors: F Vachier, J E Arlot, W Thuillot

    Abstract:

    Every six years mutual eclipses and occultations occur among the Jovian system of satellites. Very accurate astrometric measurements and several physical characteristics of the surfaces can be infered from their observation. This paper is provide predictions of this type of events involving the fifth satellite J5 Amalthea, spanning from November 2002 to June 2003 and to urge astronomers to observe them. Only the predictions of the eclipses of Amalthea by Io are presented, when the distance between Amalthea-Io and Amalthea-Jutpiter is large enough for photometric purposes. A full list of phenomena is available on the server http://www.imcce.fr/Phemu03/phemu03_eng.html.

F Vachier – 3rd expert on this subject based on the ideXlab platform

  • Mutual phenomena involving J5 Amalthea in 2002–2003
    Astronomy and Astrophysics, 2002
    Co-Authors: F Vachier, J E Arlot, W Thuillot

    Abstract:

    Every six years mutual eclipses and occultations occur among the Jovian system of satellites. Very accurate astrometric measurements and several physical characteristics of the surfaces can be infered from their observation. This paper is provide predictions of this type of events involving the fifth satellite J5 Amalthea, spanning from November 2002 to June 2003 and to urge astronomers to observe them. Only the predictions of the eclipses of Amalthea by Io are presented, when the distance between Amalthea-Io and Amalthea-Jutpiter is large enough for photometric purposes. A full list of phenomena is available on the server http://www.imcce.fr/Phemu03/phemu03_eng.html.

  • mutual phenomena involving j5 Amalthea in 2002 2003
    Astronomy and Astrophysics, 2002
    Co-Authors: F Vachier, J E Arlot, W Thuillot

    Abstract:

    Every six years mutual eclipses and occultations occur among the Jovian system of satellites. Very accurate astrometric measurements and several physical characteristics of the surfaces can be infered from their observation. This paper is provide predictions of this type of events involving the fifth satellite J5 Amalthea, spanning from November 2002 to June 2003 and to urge astronomers to observe them. Only the predictions of the eclipses of Amalthea by Io are presented, when the distance between Amalthea-Io and Amalthea-Jutpiter is large enough for photometric purposes. A full list of phenomena is available on the server http://www.imcce.fr/Phemu03/phemu03_eng.html.