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Journal ArticleDOI

Mutual phenomena of the Galilean satellites in 1973. I - Total and near-total occultations of Europa by Io

01 Jan 1975-The Astronomical Journal-Vol. 80, pp 56-63
About: This article is published in The Astronomical Journal.The article was published on 1975-01-01. It has received 11 citations till now. The article focuses on the topics: Galilean moons & Orbital elements.
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Journal ArticleDOI
TL;DR: In this article, the authors derived the first secondary eclipse map of an exoplanet, HD 189733b, based on Spitzer IRAC 8?m data, and developed two complementary techniques for deriving the two-dimensional planet intensity: regularized slice mapping and spherical harmonic mapping.
Abstract: We derive the first secondary eclipse map of an exoplanet, HD 189733b, based on Spitzer IRAC 8 ?m data. We develop two complementary techniques for deriving the two-dimensional planet intensity: regularized slice mapping and spherical harmonic mapping. Both techniques give similar derived intensity maps for the infrared dayside flux of the planet, while the spherical harmonic method can be extended to include phase variation data which better constrain the map. The longitudinal offset of the dayside hot spot is consistent with that found in prior studies, strengthening the claim of super-rotating winds, and eliminating the possibility of phase variations being caused by stellar variability. The latitude of the hot spot is within 125 (68% confidence) of the planet's equator, confirming the predictions of general circulation models for hot Jupiters and indicative of a small planet obliquity.

171 citations


Additional excerpts

  • ...Eclipse mapping has been applied variously to map stars (e.g. Schmitt & Kurster 1993; Lanza et al. 1998), accretion disks (e.g. Horne 1985), planetary satellites (e.g. Aksnes & Franklin 1975), dwarf planets (e.g. Young et al. 1999, 2001), and unresolved radio sources (e.g. Taylor 1966, 1967)....

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Journal ArticleDOI
01 Dec 1975-Icarus
TL;DR: In this paper, the dependence of brightness on solar phase angle for various faces of each satellite is determined and significant differences in this dependence are found between different faces of the same satellite, between satellites, and between the present results and those of previous investigators.

70 citations

Journal ArticleDOI
TL;DR: In the case of Pluto and its satellite, Charon, the mutual occultation and transit events as discussed by the authors have allowed the first precise determinations of their individual radii, densities, and surface compositions.
Abstract: Since 1985, planetary astronomers have been working to take advantage of a once-per-century apparent alignment between Pluto and its satellite, Charon, which has allowed mutual occultation and transit events to be observed. There events, which will cease in 1990, have permitted the first precise determinations of their individual radii, densities, and surface compositions. In addition, information on their surface albedo distributions can be obtained.

13 citations


Cites background from "Mutual phenomena of the Galilean sa..."

  • ...Such events can provide Earth-bound astronomers with a powerful tool for measuring physical properties of the occulting bodies, as demonstrated by the Galilean satellite mutual events observed in the early 1970's [e.g. Aksnes and Franklin, 1975 ]....

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Journal ArticleDOI
11 Dec 1975-Nature
TL;DR: In photoelectric observations of a series of occultations of the Jovian satellite Europa by Io, it was observed that increasingly larger fractions of the north polar region of the former were covered at mid-event with each successive occultation as discussed by the authors.
Abstract: In photoelectric observations of a series of occultations of the Jovian satellite Europa by the Jovian satellite Io it was observed that increasingly larger fractions of the north polar region of the former were covered at mid-event with each successive occultation. One of the possible explanations of the observed phenomena involves the existence of a bright north polar cap for Europa. The reported investigation shows that a second explanation may be more plausible. This explanation is related to the possibility that at mid-event the projected minimum distance between the centers of the satellites was smaller than predicted by Sampson's theory.

5 citations

Journal ArticleDOI
01 Jan 1996

5 citations