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AbstractAbstract
[en] The configuration of Saturn rings seen edge-on in 1979-1980 gave us an opportunity to search for a new Saturn ring which could extend outwards from those already known. We designed for the purpose a new focal instrument which was adapted to the Meudon and Pic-du-Midi telescopes and based upon the principle of the coronograph. A new Saturn ring was detected on 1st November 1979 up to 3.9 radii from Saturn center. We recorded it again on 29th January 1980 to about seven radii from center, and again on several other nights since
[fr]
La presentation des anneaux de Saturne par la tranche en 1979-1980 nous a permis de deceler un anneau supplementaire de Saturne qui pourrait s'etendre au-dela de ceux deja connus. Nous avons adapte pour cela un nouvel instrument au foyer des telescopes de Meudon et du Pic-du-Midi, derive du principe du coronographe. Un nouvel anneau a ete decele le 1er novembre 1979 jusqu'a 3,9 rayons du centre de Saturne. Nous l'avons photographie a nouveau le 29 janvier 1980 jusqu'a pres de sept rayons du centre, puis encore plusieurs fois depuisOriginal Title
Le coronographe focal et l'observation d'un nouvel anneau de Saturne
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Record Type
Journal Article
Journal
C. R. Seances Acad. Sci., Ser. B; v. 290(12); p. 261-263
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AbstractAbstract
[en] Electronographic plates of Saturn were taken during the transit of the Earth through the ring plane. Observing conditions were more favorable than those prevailing in 1966. Thanks to the quality of the detectors and the telescopes, it has been possible to make a more precise photometric determination of the brightness of the ring seen edge on and to measure the brightness variation with respect to the distance to the center of the planet. Extrapolating to the case where the elevation of the Earth above the ring plane is strictly zero, we deduce an apparent photometric ring thickness equal to 1.5+-0.3 km. For an homogeneous layer of small particles colliding inelastically, theory predicts a thickness of the order of a few particles radii, i.e. a few tens of meters. The observed brightness could be explained by the E ring, the brightness of large chunks, condensations and warping of the ring
[fr]
On a obtenu une serie de cliches electronographiques de Saturne sur une periode qui englobait le passage de la terre a travers le plan de l'anneau. Les conditions d'observation etaient plus favorables que celles de 1966. L'utilisation de recepteurs electronographiques associes a des telescopes de diametre superieur a 1 m a permis d'effectuer une photometrie plus precise de l'anneau vu par la tranche et d'obtenir une resolution radiale de celui-ci. L'extrapolation de son eclat au cas ou l'elevation de la terre au-dessus du plan de l'anneau est exactement nulle conduit a une 'epaisseur photometrique apparente', zsub(t)=1,5+-0,3 km. Dans le cas d'une couche homogene de particules de petites dimensions, en collisions inelastiques, la theorie prevoit une epaisseur de l'ordre de quelques unites de la dimension des particules, soit quelques dizaines de metres. L'ecart observe pourrait s'expliquer par la presence de l'anneau E, l'eclat de gros blocs, l'existence de condensation et un gauchissement de l'anneauOriginal Title
Sur l'epaisseur des anneaux de Saturne
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Record Type
Journal Article
Journal
C. R. Seances Acad. Sci., Ser. B; v. 291(8); p. 209-214
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AbstractAbstract
[en] The problem of the geometric thickness of the Saturn rings is considered. It was noted that in 1966 the Earth had crossed the ring plane of the Saturn. Using this event R.I. Kiladze (Abastumani), and Focas and Dollfus (Pic du Midi) evaluated the thickness of the Saturn rings. With the purpose of a more precise analysis the photographic plates of Focas and Dollfus were again remeasured. From the results of this analysis it might be concluded that the thickness of the Saturn rings was not known very well, and that it was less than 3 km
Primary Subject
Source
AN SSSR, Moscow. Astronomicheskij Sovet; Nauchnye Informatsii; no. 45; p. 19-21; 1978; p. 19-21; 2. Soviet-Finland symposiumon astrophysics; Abastumani, USSR; 4 - 9 Sep 1977
Record Type
Miscellaneous
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Conference
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AbstractAbstract
[en] It is shown that mutual collisions of particles of the Saturn's rings result in covering the particles by a few-millimeter friable ice dust layer which protects teh ice from further destruction. Analytical dependencies of the restitution coefficient on the collision velocities are derived for a simple impact model in the cases of smooth particles and particles covered by a friable layer of various thickness
Original Title
Koehffitsient neuprugosti stalkivayushchikhsya ledyanykh chastits kolets Saturna
Primary Subject
Source
For English translation see the journal Soviet Astronomy Letters (USA).
Record Type
Journal Article
Journal
Pis'ma v Astronomicheskij Zhurnal; ISSN 0320-0108;
; v. 11(1); p. 66-71

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AbstractAbstract
[en] The tenth satellite of Saturn, Janus was discovered in 1966 on the occasion of the edge-on presentation of the rings. Its orbit is equatorial, circular and close to the outer edge of ring A. The new satellite observations of March 1980, when the rings were again seen edge-on, permit the reidentification of Janus and the determination of its most probable period, 0.694 684 day, but without excluding, however, two other possible values: 0.694 783 or 0.694 584 day; the orbital semi-axis is 151 500 km. Another object, less bright and provisionally designated 1980 S3, is associated with Janus in a similar orbit, but leading it in March 1980 by 1900 in longitude; this longitude difference was 2240 in december 1966. These two objects have to be associated gravitationally
[fr]
Le dixieme satellite de Saturne, Janus, a ete decouvert en 1966, a la faveur de la presentation des anneaux par la tranche; son orbite equatoriale et circulaire est tres proche du rebord exterieur de l'anneau A. Les observations de satellites en mars 1980, alors que les anneaux etaient a nouveau vus de profil, permettent de reidentifier Janus et de determiner sa periode la plus probable: 0,694 684 jour sans pouvoir exclure toutefois deux autres valeurs possibles: 0,694 783 ou 0,694 584 jour; le demi-axe de son orbite vaut 151 500 km. Un second objet, de designation provisoire 1980 S3, gravite sur une orbite semblable, son eclat est plus faible; en mars 1980, il precedait Janus par 1900 en longitude et cette valeur etait 2240 en decembre 1966. Ces deux objets doivent etre associes gravitationnellementOriginal Title
Determination des elements orbitaux de Janus, le dixieme satellite de Saturne
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Journal Article
Journal
C. R. Seances Acad. Sci., Ser. B; v. 291(6); p. 177-180
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AbstractAbstract
[en] Recent discoveries about Saturne planet are recapitulated: the rings and the four new satellites
[fr]
On recapitule les decouvertes recentes autour de Saturne: les anneaux et quatre nouveaux satellitesOriginal Title
Embouteillages autour de Saturne
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Record Type
Journal Article
Journal
Recherche (Paris); ISSN 0029-5671;
; v. 11(114); p. 998-1000

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AbstractAbstract
[en] In the attempt to try to explain the existence of the hydrogen ring atmosphere as due to the erosion of icy surfaces induced by the inpact of the ions of the Saturn magnetosphere in the vicinity of the E ring and of the moons Dione and Tethys, as is suggested by the considerable decrease in the ion phase space densities between 4.5 and 8 Saturn radii, a strong constraint on the lifetimes of the grains which belong to the E ring or on their nature has been found. (Auth.)
Original Title
Saturn planet
Primary Subject
Source
Fricke, W. (Astronomisches Rechen-Institut, Heidelberg, Germany, F.R.); Teleki, G. (Astronomical Observatory, Belgrade, Yugoslavia) (eds.); Astrophysics and Space Science Library Proceedings; v. 96; 551 p; ISBN 90-277-1429-0;
; 1982; p. 251-252; D. Reidel; Dordrecht (Netherlands); 6. European regional meeting in astronomy; Dubrovnik (Yugoslavia); 19 - 23 Oct 1981

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Book
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Conference
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AbstractAbstract
[en] Recent data obtained by Voyager 1 and 2 on the satellites of Jupiter and Saturn planets are briefly reviewed
[fr]
On passe rapidement en revue les dernieres donnees obtenues par Voyager 1 et Voyager 2 sur les satellites de Jupiter et SaturneOriginal Title
Les satellites de Jupiter et Saturne
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Record Type
Journal Article
Journal
Recherche (Paris); ISSN 0029-5671;
; v. 12(120); p. 290-303

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AbstractAbstract
[en] A catalogue of more than 51000 observations of the first eight satellites of Saturn has been compiled, and we give a description of this catalogue. Most of the published observations made since 1966, the majority of which are photographic, have been included together with some unpublished series of observations. These have been supplemented by a selection of older data, mostly visual observations, increasing the time-span of the data to 115 years. The observations have been obtained from both published and unpublished sources and tabulated in a consistent format, all times having been reduced to the one time-scale (UTC). Bad quality measurements have been identified and obvious blunders have been corrected. Residuals are given with the observations to show the quality of the data, and as an aid in weighting the different datasets in any subsequent analysis, such as will be required for the precise orbit determinations needed for future space probes like Cassini
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Journal Article
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Numerical Data
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AbstractAbstract
[en] New results emerging from observations of Saturn in 1979-1980, when the rings were seen edge on, are reported. These include details of the outer (E ring) to Saturn and the orbit to Janus. Observations were made with a fully coronographic system adapted to the Meudon 100 cms and Pic-du-Midi 107 cms telescopes in France. (author)
Primary Subject
Source
Planetary exploration: a discussion arranged by the British National Committee on Space Research under the leadership of Sir Harrie Massey, S.K. Runcorn, J.E. Guest, G.E. Hunt and M.M. Woolfson.
Record Type
Journal Article
Journal
Philosophical Transactions of the Royal Society of London. Series A: Mathematical and Physical Sciences; ISSN 0080-4614;
; v. 303(1477); p. 281-283

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