6-1 6.0 SATURN SYSTEM MYTHOLOGY Until the Middle Of
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Arxiv:1912.09192V2 [Astro-Ph.EP] 24 Feb 2020
Draft version February 25, 2020 Typeset using LATEX preprint style in AASTeX62 Photometric analyses of Saturn's small moons: Aegaeon, Methone and Pallene are dark; Helene and Calypso are bright. M. M. Hedman,1 P. Helfenstein,2 R. O. Chancia,1, 3 P. Thomas,2 E. Roussos,4 C. Paranicas,5 and A. J. Verbiscer6 1Department of Physics, University of Idaho, Moscow, ID 83844 2Cornell Center for Astrophysics and Planetary Science, Cornell University, Ithaca NY 14853 3Center for Imaging Science, Rochester Institute of Technology, Rochester NY 14623 4Max Planck Institute for Solar System Research, G¨ottingen,Germany 37077 5APL, John Hopkins University, Laurel MD 20723 6Department of Astronomy, University of Virginia, Charlottesville, VA 22904 ABSTRACT We examine the surface brightnesses of Saturn's smaller satellites using a photometric model that explicitly accounts for their elongated shapes and thus facilitates compar- isons among different moons. Analyses of Cassini imaging data with this model reveals that the moons Aegaeon, Methone and Pallene are darker than one would expect given trends previously observed among the nearby mid-sized satellites. On the other hand, the trojan moons Calypso and Helene have substantially brighter surfaces than their co-orbital companions Tethys and Dione. These observations are inconsistent with the moons' surface brightnesses being entirely controlled by the local flux of E-ring par- ticles, and therefore strongly imply that other phenomena are affecting their surface properties. The darkness of Aegaeon, Methone and Pallene is correlated with the fluxes of high-energy protons, implying that high-energy radiation is responsible for darkening these small moons. Meanwhile, Prometheus and Pandora appear to be brightened by their interactions with nearby dusty F ring, implying that enhanced dust fluxes are most likely responsible for Calypso's and Helene's excess brightness. -
Hyperion-Iapetus: Collisional Relationships
A&A 381, 1059–1065 (2002) Astronomy DOI: 10.1051/0004-6361:20011587 & c ESO 2002 Astrophysics Hyperion-Iapetus: Collisional relationships S. Marchi1,C.Barbieri2, A. Dell’Oro3, and P. Paolicchi4 1 Dipartimento di Astronomia, Universit`a di Padova, Vicolo dell’Osservatorio 2, 35122 Padova, Italy 2 Dipartimento di Astronomia, Universit`a di Padova, Vicolo dell’Osservatorio 2, 35122 Padova, Italy e-mail: [email protected] 3 Dipartimento di Fisica, Universit`a di Pisa, piazza Torricelli 2, 56127 Pisa, Italy e-mail: [email protected] 4 Dipartimento di Fisica, Universit`a di Pisa, piazza Torricelli 2, 56127 Pisa, Italy e-mail: [email protected] Received 29 June 2001 / Accepted 25 October 2001 Abstract. In this paper, we will deal with one of the most fascinating problems of the Solar System: the origin of the double face of Iapetus, where one half of the satellite is significantly brighter than the other. The “transfer of mass” process (see Marchi et al. 2001) may be a viable explanation for the visible dichotomy. In this process a satellite undergoes mass transfer from other satellites belonging to the same system. We analyze the pair Hyperion–Iapetus and suggest a possible explanation for the formation of the dark region, which is also known as Cassini Regio. Key words. minor planets, asteroids – solar system: general 1. Introduction 2. Transfer of mass Iapetus’ surface is divided into two parts: one with a very In a previous paper (Marchi et al. 2001), we have studied low albedo, about 0.015–0.05, which covers about a third the efficiency of mass transfer between pairs of satellites of the whole surface; the other with an albedo of about 0.5 in the whole Solar System. -
The Solar System What’S in Our Solar System?
The Solar System What’s in Our Solar System? • Our Solar System consists of a central star (the Sun), the eight planets orbiting the sun, several dwarf planets, moons, asteroids, comets, meteors, interplanetary gas, dust, and all the “space” in between them. • Solar System: a star (sun) together with all the objects revolving around it (planets and their moons, asteroids, comets, and so on). What’s in Our Solar System? • The word solar comes from the Latin solaris, meaning “of the sun.” Sol is the Latin word for “sun.” • The eight planets of the Solar System are named for Greek and Roman Gods and Goddesses. Planetary System Planetary System: a planet with its moon(s), • The Earth and moon are a planetary system. • The word planet comes from a Greek word meaning “wandering.” To the ancients, the five visible planets to the naked eye appeared to move, unlike the other fixed stars that were “fixed.” • Orbit: the path followed by a planet, asteroid, or comet around a star, or a moon around a planet. The word comes from the Latin orbita, meaning a “wheel track.” Planets, Dwarf Planets, Moons, Asteroids, and Comets • Planet: a large body, spherical because of its own gravity, orbiting a star and not sharing its orbit with any other large bodies. • Dwarf Planet: a planet-like body that orbits the sun and does not clear its orbital zone of other massive bodies, and is not a moon. • Moon: object revolving around a planet. The word moon is from an ancient German root meaning “moon” or “month.” Planets, Dwarf Planets, Moons, Asteroids, and Comets • Asteroid: a rocky or metallic object a few feet or a few miles in dimeter. -
The Hellenic Saga Gaia (Earth)
The Hellenic Saga Gaia (Earth) Uranus (Heaven) Oceanus = Tethys Iapetus (Titan) = Clymene Themis Atlas Menoetius Prometheus Epimetheus = Pandora Prometheus • “Prometheus made humans out of earth and water, and he also gave them fire…” (Apollodorus Library 1.7.1) • … “and scatter-brained Epimetheus from the first was a mischief to men who eat bread; for it was he who first took of Zeus the woman, the maiden whom he had formed” (Hesiod Theogony ca. 509) Prometheus and Zeus • Zeus concealed the secret of life • Trick of the meat and fat • Zeus concealed fire • Prometheus stole it and gave it to man • Freidrich H. Fuger, 1751 - 1818 • Zeus ordered the creation of Pandora • Zeus chained Prometheus to a mountain • The accounts here are many and confused Maxfield Parish Prometheus 1919 Prometheus Chained Dirck van Baburen 1594 - 1624 Prometheus Nicolas-Sébastien Adam 1705 - 1778 Frankenstein: The Modern Prometheus • Novel by Mary Shelly • First published in 1818. • The first true Science Fiction novel • Victor Frankenstein is Prometheus • As with the story of Prometheus, the novel asks about cause and effect, and about responsibility. • Is man accountable for his creations? • Is God? • Are there moral, ethical constraints on man’s creative urges? Mary Shelly • “I saw the pale student of unhallowed arts kneeling beside the thing he had put together. I saw the hideous phantasm of a man stretched out, and then, on the working of some powerful engine, show signs of life, and stir with an uneasy, half vital motion. Frightful must it be; for supremely frightful would be the effect of any human endeavour to mock the stupendous mechanism of the Creator of the world” (Introduction to the 1831 edition) Did I request thee, from my clay To mould me man? Did I solicit thee From darkness to promote me? John Milton, Paradise Lost 10. -
Sample Odyssey Passage
The Odyssey of Homer Translated from Greek into English prose in 1879 by S.H. Butcher and Andrew Lang. Book I In a Council of the Gods, Poseidon absent, Pallas procureth an order for the restitution of Odysseus; and appearing to his son Telemachus, in human shape, adviseth him to complain of the Wooers before the Council of the people, and then go to Pylos and Sparta to inquire about his father. Tell me, Muse, of that man, so ready at need, who wandered far and wide, after he had sacked the sacred citadel of Troy, and many were the men whose towns he saw and whose mind he learnt, yea, and many the woes he suffered in his heart upon the deep, striving to win his own life and the return of his company. Nay, but even so he saved not his company, though he desired it sore. For through the blindness of their own hearts they perished, fools, who devoured the oxen of Helios Hyperion: but the god took from them their day of returning. Of these things, goddess, daughter of Zeus, whencesoever thou hast heard thereof, declare thou even unto us. Now all the rest, as many as fled from sheer destruction, were at home, and had escaped both war and sea, but Odysseus only, craving for his wife and for his homeward path, the lady nymph Calypso held, that fair goddess, in her hollow caves, longing to have him for her lord. But when now the year had come in the courses of the seasons, wherein the gods had ordained that he should return home to Ithaca, not even there was he quit of labours, not even among his own; but all the gods had pity on him save Poseidon, who raged continually against godlike Odysseus, till he came to his own country. -
The Orbits of Saturn's Small Satellites Derived From
The Astronomical Journal, 132:692–710, 2006 August A # 2006. The American Astronomical Society. All rights reserved. Printed in U.S.A. THE ORBITS OF SATURN’S SMALL SATELLITES DERIVED FROM COMBINED HISTORIC AND CASSINI IMAGING OBSERVATIONS J. N. Spitale CICLOPS, Space Science Institute, 4750 Walnut Street, Suite 205, Boulder, CO 80301; [email protected] R. A. Jacobson Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109-8099 C. C. Porco CICLOPS, Space Science Institute, 4750 Walnut Street, Suite 205, Boulder, CO 80301 and W. M. Owen, Jr. Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109-8099 Received 2006 February 28; accepted 2006 April 12 ABSTRACT We report on the orbits of the small, inner Saturnian satellites, either recovered or newly discovered in recent Cassini imaging observations. The orbits presented here reflect improvements over our previously published values in that the time base of Cassini observations has been extended, and numerical orbital integrations have been performed in those cases in which simple precessing elliptical, inclined orbit solutions were found to be inadequate. Using combined Cassini and Voyager observations, we obtain an eccentricity for Pan 7 times smaller than previously reported because of the predominance of higher quality Cassini data in the fit. The orbit of the small satellite (S/2005 S1 [Daphnis]) discovered by Cassini in the Keeler gap in the outer A ring appears to be circular and coplanar; no external perturbations are appar- ent. Refined orbits of Atlas, Prometheus, Pandora, Janus, and Epimetheus are based on Cassini , Voyager, Hubble Space Telescope, and Earth-based data and a numerical integration perturbed by all the massive satellites and each other. -
From the Odyssey, Part 1: the Adventures of Odysseus
from The Odyssey, Part 1: The Adventures of Odysseus Homer, translated by Robert Fitzgerald ANCHOR TEXT | EPIC POEM Archivart/Alamy Stock Photo Archivart/Alamy This version of the selection alternates original text The poet, Homer, begins his epic by asking a Muse1 to help him tell the story of with summarized passages. Odysseus. Odysseus, Homer says, is famous for fighting in the Trojan War and for Dotted lines appear next to surviving a difficult journey home from Troy.2 Odysseus saw many places and met many the summarized passages. people in his travels. He tried to return his shipmates safely to their families, but they 3 made the mistake of killing the cattle of Helios, for which they paid with their lives. NOTES Homer once again asks the Muse to help him tell the tale. The next section of the poem takes place 10 years after the Trojan War. Odysseus arrives in an island kingdom called Phaeacia, which is ruled by Alcinous. Alcinous asks Odysseus to tell him the story of his travels. I am Laertes’4 son, Odysseus. Men hold me formidable for guile5 in peace and war: this fame has gone abroad to the sky’s rim. My home is on the peaked sea-mark of Ithaca6 under Mount Neion’s wind-blown robe of leaves, in sight of other islands—Dulichium, Same, wooded Zacynthus—Ithaca being most lofty in that coastal sea, and northwest, while the rest lie east and south. A rocky isle, but good for a boy’s training; I shall not see on earth a place more dear, though I have been detained long by Calypso,7 loveliest among goddesses, who held me in her smooth caves to be her heart’s delight, as Circe of Aeaea,8 the enchantress, desired me, and detained me in her hall. -
The Chaotic Rotation of Hyperion*
ICARUS 58, 137-152 (1984) The Chaotic Rotation of Hyperion* JACK WISDOM AND STANTON J. PEALE Department of Physics, University of California, Santa Barbara, California 93106 AND FRANGOIS MIGNARD Centre d'Etudes et de Recherehes G~odynamique et Astronomique, Avenue Copernic, 06130 Grasse, France Received August 22, 1983; revised November 4, 1983 A plot of spin rate versus orientation when Hyperion is at the pericenter of its orbit (surface of section) reveals a large chaotic zone surrounding the synchronous spin-orbit state of Hyperion, if the satellite is assumed to be rotating about a principal axis which is normal to its orbit plane. This means that Hyperion's rotation in this zone exhibits large, essentially random variations on a short time scale. The chaotic zone is so large that it surrounds the 1/2 and 2 states, and libration in the 3/2 state is not possible. Stability analysis shows that for libration in the synchronous and 1/2 states, the orientation of the spin axis normal to the orbit plane is unstable, whereas rotation in the 2 state is attitude stable. Rotation in the chaotic zone is also attitude unstable. A small deviation of the principal axis from the orbit normal leads to motion through all angles in both the chaotic zone and the attitude unstable libration regions. Measures of the exponential rate of separation of nearby trajectories in phase space (Lyapunov characteristic exponents) for these three-dimensional mo- tions indicate the the tumbling is chaotic and not just a regular motion through large angles. As tidal dissipation drives Hyperion's spin toward a nearly synchronous value, Hyperion necessarily enters the large chaotic zone. -
Archaic Eretria
ARCHAIC ERETRIA This book presents for the first time a history of Eretria during the Archaic Era, the city’s most notable period of political importance. Keith Walker examines all the major elements of the city’s success. One of the key factors explored is Eretria’s role as a pioneer coloniser in both the Levant and the West— its early Aegean ‘island empire’ anticipates that of Athens by more than a century, and Eretrian shipping and trade was similarly widespread. We are shown how the strength of the navy conferred thalassocratic status on the city between 506 and 490 BC, and that the importance of its rowers (Eretria means ‘the rowing city’) probably explains the appearance of its democratic constitution. Walker dates this to the last decade of the sixth century; given the presence of Athenian political exiles there, this may well have provided a model for the later reforms of Kleisthenes in Athens. Eretria’s major, indeed dominant, role in the events of central Greece in the last half of the sixth century, and in the events of the Ionian Revolt to 490, is clearly demonstrated, and the tyranny of Diagoras (c. 538–509), perhaps the golden age of the city, is fully examined. Full documentation of literary, epigraphic and archaeological sources (most of which have previously been inaccessible to an English-speaking audience) is provided, creating a fascinating history and a valuable resource for the Greek historian. Keith Walker is a Research Associate in the Department of Classics, History and Religion at the University of New England, Armidale, Australia. -
Apollonius of Rhodes Argonautica Book 3, Translated by Robert Cooper Seaton, Harvard University Press, Cambridge MA, 1912
Apollonius of Rhodes Argonautica book 3, translated by Robert Cooper Seaton, Harvard University Press, Cambridge MA, 1912. (http://oaks.nvg.org/sa4ra16.html#tres) Come Now, Erato, stand by my side, and say next how Jason brought back the fleece to Iolcus aided by the love of Medea. For you share the power of Cypris, and by your love-cares charm unwedded maidens; wherefore to you too is attached a name that tells of love. Thus the heroes, unobserved, were waiting in ambush amid the thick reed-beds; but Hera and Athena took note of them, and, apart from Zeus and the other immortals, entered a chamber and took counsel together; and Hera first made trial of Athena: "Do you now first, daughter of Zeus, give advice. What must be done? Will you devise some scheme whereby they may seize the golden fleece of Aeetes and bear it to Hellas, or can they deceive the king with soft words and so work persuasion? Of a truth he is terribly overweening. Still it is right to shrink from no endeavour." Thus she spoke, and at once Athena addressed her: "I too was pondering such thoughts in my heart, Hera, when you did ask me outright. But not yet do I think that I have conceived a scheme to aid the courage of the heroes, though I have balanced many plans." She ended, and the goddesses fixed their eyes on the ground at their feet, brooding apart; and straightway Hera was the first to speak her thought: "Come, let us go to Cypris; let both of us accost her and urge her to bid her son (if only he will obey) speed his shaft at the daughter of Aeetes, the enchantress, and charm her with love for Jason. -
Lab Assignment 1
CS181: Programming Languages Vladimir Vacic, Christos Koufogiannakis University of California, Riverside Lab Assignment 1 1. Given the following graph of possible flights between seven US cities: (graph taken from the web site of the American Mathematical Society, http://www.ams.org) a) Write a Prolog program that would check if there is a route from Fresno to Dallas, from Seattle to Boston, and from Atlanta to Fresno. b) Write a C program that does the same thing. Note: you have to write complete, working programs, run them and show the results. As far as C goes, the choice of data structure to store the relations between cities is yours. Warning: if there are cycles in the graph, Prolog might never find a solution and may never say that there are no solutions. If this happens in your assignment, make a note of that. 2. Given the partial family tree of the gods of the ancient Greeks encoded as a Prolog database: parent(chaos, gaea). parent(gaea, cyclope). parent(gaea, chronos). parent(gaea, coeus). parent(gaea, oceanus). parent(uranus, cyclope). parent(uranus, chronos). parent(uranus, coeus). parent(uranus, oceanus). parent(chronos, hades). parent(chronos, poseidon). parent(chronos, zeus). parent(rhea, hades). parent(rhea, poseidon). parent(rhea, zeus). parent(coeus, leto). parent(phoebe, leto). parent(leto, apollo). parent(leto, artemis). parent(zeus, apollo). parent(zeus, artemis). parent(oceanus, iapetus). parent(tethys, iapetus). parent(hera, ares). parent(zeus, ares). male(chaos). male(cyclope). male(uranus). male(chronos). male(coeus). male(oceanus). male(hades). male(poseidon). male(zeus). male(ares). male(apollo). male(iapetus). -
Hesiod Theogony.Pdf
Hesiod (8th or 7th c. BC, composed in Greek) The Homeric epics, the Iliad and the Odyssey, are probably slightly earlier than Hesiod’s two surviving poems, the Works and Days and the Theogony. Yet in many ways Hesiod is the more important author for the study of Greek mythology. While Homer treats cer- tain aspects of the saga of the Trojan War, he makes no attempt at treating myth more generally. He often includes short digressions and tantalizes us with hints of a broader tra- dition, but much of this remains obscure. Hesiod, by contrast, sought in his Theogony to give a connected account of the creation of the universe. For the study of myth he is im- portant precisely because his is the oldest surviving attempt to treat systematically the mythical tradition from the first gods down to the great heroes. Also unlike the legendary Homer, Hesiod is for us an historical figure and a real per- sonality. His Works and Days contains a great deal of autobiographical information, in- cluding his birthplace (Ascra in Boiotia), where his father had come from (Cyme in Asia Minor), and the name of his brother (Perses), with whom he had a dispute that was the inspiration for composing the Works and Days. His exact date cannot be determined with precision, but there is general agreement that he lived in the 8th century or perhaps the early 7th century BC. His life, therefore, was approximately contemporaneous with the beginning of alphabetic writing in the Greek world. Although we do not know whether Hesiod himself employed this new invention in composing his poems, we can be certain that it was soon used to record and pass them on.