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See detailThe astronomical calibration of the Givetian (Middle Devonian) time scale (Dinant Synclinorium, Belgium).
De Vleeschouwer; Boulvain, Frédéric ULg; Da Silva, Anne-Christine ULg et al

in Whalen; Osadetz; Richards (Eds.) et al IGCP-580/596, Geophysical and Geochemical techniques: a window on the Paleozoic world, Abstract book (2013)

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See detailThe astronomical calibration of the Givetian (Middle Devonian) timescale (Dinant Synclinorium, Belgium)
De Vleeschouwer, David; Boulvain, Frédéric ULg; Da Silva, Anne-Christine ULg et al

in Geological Society Special Publication (2015), 414

Recent advances in radiometric dating result in significant improvements in the geological timescale and provide better insight into the timing of various processes and evolutions within the Earth’s ... [more ▼]

Recent advances in radiometric dating result in significant improvements in the geological timescale and provide better insight into the timing of various processes and evolutions within the Earth’s system. However, no radiometric ages are contained within the Givetian. Consequently, the absolute ages of the Givetian Stage boundaries, as well as the stage’s duration, remain poorly constrained. As an alternative, the analysis of sedimentary cycles allows for the estimation of the duration of this stage. We examined the high-resolution magnetic susceptibility signals of four Givetian outcrops in the Givet area for a possible astronomical imprint, to fully understand the rates of evolutionary and environmental change. All four sections are firmly correlated and wavelet analyses of the magnetic susceptibility signals reveal the imprint of astronomical eccentricity forcing. The highly stable 405 kyr cycles constrain the duration of the Givetian Stage at 4.35+0.45 Myr, which is in good agreement with the International Chronostratigraphic Chart (5.0 Myr). The studied sections also exhibit an imprint of obliquity, suggesting a climatic teleconnection between low and high latitudes. The corresponding microfacies curves demonstrate similar astronomical imprint, and thereby indicate that the observed 10 5year-scale cyclicity is the result of climatic and environmental change [less ▲]

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See detailAstronomical Optics -- D. J. Schroeder
Manfroid, Jean ULg

in Ciel et Terre (1988), 104

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See detailAstronomical photographic atlas
Heck, Andre; Manfroid, Jean ULg

Book published by Desoer (1977)

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See detailAstronomical Photometry, A Guide
Sterken, Christiaan; Manfroid, Jean ULg

Book (1992)

Small and large telescopes are being installed all around the world. Astronomers have thus acquired better access to more modern equipment; not in the least to photometers, which are very important tools ... [more ▼]

Small and large telescopes are being installed all around the world. Astronomers have thus acquired better access to more modern equipment; not in the least to photometers, which are very important tools for the contemporary observer. This development of higher quality and more sensitive equipment makes it very necessary to improve the accuracy of the measurements. This guide helps the astronomer and astronomy student to improve the quality of their photometric measurements and to extract a maximum of information from their observations. The book is based on the authors' observing experience, spending numerious nights behind various instruments at many different observatories. [less ▲]

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See detailAn astronomical survey conducted in Belgium
Nazé, Yaël ULg; Fontaine, Sébastien ULg

in Physics Education (2014), 49

This article presents the results of the first survey conducted in Belgium about the interest and knowledge in astronomy. Two samples were studied, the public at large (667 questionnaires) and students ... [more ▼]

This article presents the results of the first survey conducted in Belgium about the interest and knowledge in astronomy. Two samples were studied, the public at large (667 questionnaires) and students (2589 questionnaires), but the results are generally similar in both samples. We evaluated people’s interest, main information source, and attitudes towards astronomy, as well as their supposed and actual knowledge of the subject. The main conclusion is that, despite a poor self-confidence, people do know the basic astronomical concepts. However, that knowledge is not deeply rooted, as reasoning questions show well-spread misconceptions and/or misunderstandings. [less ▲]

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See detailL'astronomie au quotidien -- G. Leblanc et J. Lomont
Manfroid, Jean ULg

in Ciel et Terre (1989), 105

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See detailL'astronomie au temps de Kepler
Le Paige, Constantin ULg

Speech/Talk (1896)

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See detailAstronomie CCD -- C. Buyl
Manfroid, Jean ULg

in Ciel et Terre (1990), 106

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See detailAstronomie dans le monde
Manfroid, Jean ULg

Article for general public (2011)

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See detailL'astronomie dans le monde - 12/2014
Manfroid, Jean ULg

Article for general public (2014)

Les comètes de bêta Pictoris, GG Tau-A - Jupiters chauds dans un système binaire - Lumière exozodiacale - Rosetta - Reflets sur Titan - La galaxie de la Toile d’Araignée - HL Tauri - L’amas Abell 2744 ... [more ▼]

Les comètes de bêta Pictoris, GG Tau-A - Jupiters chauds dans un système binaire - Lumière exozodiacale - Rosetta - Reflets sur Titan - La galaxie de la Toile d’Araignée - HL Tauri - L’amas Abell 2744 - Le plus brillant pulsar jamais observé [less ▲]

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See detailL'astronomie dans le monde - 01
Manfroid, Jean ULg

Article for general public (2013)

Polaris; Trou noir géant; Jet record; Mercure; Makémaké

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See detailL'astronomie dans le monde - 01/2014
Manfroid, Jean ULg

Article for general public (2014)

Sgr A*; Géant cosmique; Pénitents d’Europe; Pulsars milliseconde; Poussières lunaires; Trous noirs intermédiaires; Rosetta; Visiteurs vers Mars; Géologie martienne; Mars et les astéroïdes; Lac martien

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See detailL'astronomie dans le monde - 01/2015
Manfroid, Jean ULg

Article for general public (2015)

Alignements de quasars - La galaxie ESO 137-001 - Les mers de sable de Titan - Planck : matière noire et neutrinos fossiles - Quatre images d’une supernova - Les étoiles manquantes - NGC3226 - Vesta - Où ... [more ▼]

Alignements de quasars - La galaxie ESO 137-001 - Les mers de sable de Titan - Planck : matière noire et neutrinos fossiles - Quatre images d’une supernova - Les étoiles manquantes - NGC3226 - Vesta - Où est Philae ? - L’eau de 67P - Une spirale particulière - Météorite martienne [less ▲]

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See detailL'astronomie dans le monde - 02
Manfroid, Jean ULg

Article for general public (2013)

Transit vénusien; Tau Ceti; Toutatis; Titan; GRAIL; Kepler; Voie Lactée

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See detailL'astronomie dans le monde - 02/2014
Manfroid, Jean ULg

Article for general public (2014)

Gaia; GRBs et trous noirs; Champ magnétique à la surface d’une Mira; L’astéroïde 2014AA; SN 1987A; Azote cométaire; Fomalhaut; Étoiles multiples; Spirales; Pourquoi y a-t-il des étoiles massives ... [more ▼]

Gaia; GRBs et trous noirs; Champ magnétique à la surface d’une Mira; L’astéroïde 2014AA; SN 1987A; Azote cométaire; Fomalhaut; Étoiles multiples; Spirales; Pourquoi y a-t-il des étoiles massives ?; Nébuleuse du Crabe; Un pulsar et deux naines blanches [less ▲]

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See detailL'astronomie dans le monde - 02/2015
Manfroid, Jean ULg

Article for general public (2015)

Planètes Kepler - In extremis, le pulsar J1906... - L'âge des étoiles -Gioiello - La galaxie KKs3 - NuSTAR et le Soleil - Trou noir de J1329+3234

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See detailL'astronomie dans le monde - 03
Manfroid, Jean ULg

Article for general public (2013)

Transit vénusien; Tau Ceti; Toutatis; Titan; GRAIL; Kepler; Voie Lactée

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See detailL'astronomie dans le monde - 03/2014
Manfroid, Jean ULg

Article for general public (2014)

De la vapeur d’eau autour de Cérès; La Nébuleuse de la Lagune; Le réveil de Rosetta; Planètes de M67; Une supernova dans M82

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See detailL'astronomie dans le monde - 03/2015
Manfroid, Jean ULg

Article for general public (2015)

2004 BL86 - Astéroïdes NEA accessibles - Yellow balls -Opportunity - Nouvelles de Rosetta et 67P/Churyumov-Gerasimenko - Boule de neige sale - Chang'e 5-T1

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