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1. What Are the RA and DEC of Perseus Constellation? at What Time
1. What are the RA and DEC of Perseus constellation? At what time do you expect it to transit at Kharagpur on 23 January? Does the Sun ever visit this constellation? How high in the sky from the horizon, will this constellation appear? 2. Sketch the Orion constellation, and indicate the location of the Orion nebua. What is the Orion nebula? 3. Explain briefly why Earth’s rotation axis precesses. What is the rate of precession? 4. Verify that a(1 − e2) u−1 = r = 1+ e cos φ with a = −2GM/E and e = [1+2J 2E2/G2M 2]1/2 is acually a solution to the equation 2 1 du E = J 2 + J 2u2 − GMu 2 dφ! which governs the trajectory under the gravitational attraction of a massive object. 5. Show that 4π2 P 2 = a3 GM for a general elliptic orbit. 6. Assuming that the Earth has a rotational period of 24 hrs around its own axis and revolution period of 365.25 days around the Sun, what is the length of a Solar day? After what period do distant stars come back to the same position on the sky? 7. Given Comet Halley has period 75 yrs, determine the semimajor axis of its orbit? 8. Consider an orbit around the Sun with e = 0.3. What is the ratio of the speeds at apogee and perigee? 9. At what height from center of Earth do we have geostationary satellite orbits? 10. For a central force motion in a gravitational potential α/r, show that A~ = ~v × L~ + α~r/r is conserved. -
Naming the Extrasolar Planets
Naming the extrasolar planets W. Lyra Max Planck Institute for Astronomy, K¨onigstuhl 17, 69177, Heidelberg, Germany [email protected] Abstract and OGLE-TR-182 b, which does not help educators convey the message that these planets are quite similar to Jupiter. Extrasolar planets are not named and are referred to only In stark contrast, the sentence“planet Apollo is a gas giant by their assigned scientific designation. The reason given like Jupiter” is heavily - yet invisibly - coated with Coper- by the IAU to not name the planets is that it is consid- nicanism. ered impractical as planets are expected to be common. I One reason given by the IAU for not considering naming advance some reasons as to why this logic is flawed, and sug- the extrasolar planets is that it is a task deemed impractical. gest names for the 403 extrasolar planet candidates known One source is quoted as having said “if planets are found to as of Oct 2009. The names follow a scheme of association occur very frequently in the Universe, a system of individual with the constellation that the host star pertains to, and names for planets might well rapidly be found equally im- therefore are mostly drawn from Roman-Greek mythology. practicable as it is for stars, as planet discoveries progress.” Other mythologies may also be used given that a suitable 1. This leads to a second argument. It is indeed impractical association is established. to name all stars. But some stars are named nonetheless. In fact, all other classes of astronomical bodies are named. -
Wynyard Planetarium & Observatory a Autumn Observing Notes
Wynyard Planetarium & Observatory A Autumn Observing Notes Wynyard Planetarium & Observatory PUBLIC OBSERVING – Autumn Tour of the Sky with the Naked Eye CASSIOPEIA Look for the ‘W’ 4 shape 3 Polaris URSA MINOR Notice how the constellations swing around Polaris during the night Pherkad Kochab Is Kochab orange compared 2 to Polaris? Pointers Is Dubhe Dubhe yellowish compared to Merak? 1 Merak THE PLOUGH Figure 1: Sketch of the northern sky in autumn. © Rob Peeling, CaDAS, 2007 version 1.2 Wynyard Planetarium & Observatory PUBLIC OBSERVING – Autumn North 1. On leaving the planetarium, turn around and look northwards over the roof of the building. Close to the horizon is a group of stars like the outline of a saucepan with the handle stretching to your left. This is the Plough (also called the Big Dipper) and is part of the constellation Ursa Major, the Great Bear. The two right-hand stars are called the Pointers. Can you tell that the higher of the two, Dubhe is slightly yellowish compared to the lower, Merak? Check with binoculars. Not all stars are white. The colour shows that Dubhe is cooler than Merak in the same way that red-hot is cooler than white- hot. 2. Use the Pointers to guide you upwards to the next bright star. This is Polaris, the Pole (or North) Star. Note that it is not the brightest star in the sky, a common misconception. Below and to the left are two prominent but fainter stars. These are Kochab and Pherkad, the Guardians of the Pole. Look carefully and you will notice that Kochab is slightly orange when compared to Polaris. -
The Mid-Infrared Extinction Law in the Ophiuchus, Perseus, and Serpens
The Mid-Infrared Extinction Law in the Ophiuchus, Perseus, and Serpens Molecular Clouds Nicholas L. Chapman1,2, Lee G. Mundy1, Shih-Ping Lai3, Neal J. Evans II4 ABSTRACT We compute the mid-infrared extinction law from 3.6−24µm in three molecu- lar clouds: Ophiuchus, Perseus, and Serpens, by combining data from the “Cores to Disks” Spitzer Legacy Science program with deep JHKs imaging. Using a new technique, we are able to calculate the line-of-sight extinction law towards each background star in our fields. With these line-of-sight measurements, we create, for the first time, maps of the χ2 deviation of the data from two extinc- tion law models. Because our χ2 maps have the same spatial resolution as our extinction maps, we can directly observe the changing extinction law as a func- tion of the total column density. In the Spitzer IRAC bands, 3.6 − 8 µm, we see evidence for grain growth. Below AKs =0.5, our extinction law is well-fit by the Weingartner & Draine (2001) RV = 3.1 diffuse interstellar medium dust model. As the extinction increases, our law gradually flattens, and for AKs ≥ 1, the data are more consistent with the Weingartner & Draine RV = 5.5 model that uses larger maximum dust grain sizes. At 24 µm, our extinction law is 2 − 4× higher than the values predicted by theoretical dust models, but is more consistent with the observational results of Flaherty et al. (2007). Lastly, from our χ2 maps we identify a region in Perseus where the IRAC extinction law is anomalously high considering its column density. -
2 the Muse “Former Poets,” and the Problem of the Past
2 The Muse “former poets,” and the problem of the past Past and Present in Archaic Greek Poetry “old” and “new” in pindar In this chapter, I consider the ways in which epinician poetry regards and represents the past. The past plays a complicated role in this genre. It is of great significance for the epinician project: contempo- rary athletic victories recall and invite comparison with the deeds of heroes from the distant past. But the primary and immediate function of epinician poetry is to praise contemporaries—men of the present. Because of this, a tension is set up between past and present as epinician themes. In epinician poetry, a besetting concern is that the past should not eclipse the present. Epinician poetry repeatedly emphasizes a focus on the present as part of its formal program. In Nemean 4, the poet says that typically, victors are praised in their own day, and by their peers. The poet declines to celebrate the victor’s dead uncle, a former victor at the Isthmus, because, he says, the victor’s grandfather is better qualified to do so. “For some belong to one generation, others to another; but each person hopes to speak best of what he himself has encountered” (91–92). Pindar’s odes also contain many internal references to the here- and-now aspect of epinician performance. The poet urges that it is necessary to celebrate “today” [σα µερν, O. 6.28; P. 4.1–2], and prom- ises a song “right now” [νυν , O. 11.11]. He exhorts the Muses to shed splendor, or shoot shafts of song “now” (N. -
Greek Mythology
Greek Mythology The Creation Myth “First Chaos came into being, next wide bosomed Gaea(Earth), Tartarus and Eros (Love). From Chaos came forth Erebus and black Night. Of Night were born Aether and Day (whom she brought forth after intercourse with Erebus), and Doom, Fate, Death, sleep, Dreams; also, though she lay with none, the Hesperides and Blame and Woe and the Fates, and Nemesis to afflict mortal men, and Deceit, Friendship, Age and Strife, which also had gloomy offspring.”[11] “And Earth first bore starry Heaven (Uranus), equal to herself to cover her on every side and to be an ever-sure abiding place for the blessed gods. And earth brought forth, without intercourse of love, the Hills, haunts of the Nymphs and the fruitless sea with his raging swell.”[11] Heaven “gazing down fondly at her (Earth) from the mountains he showered fertile rain upon her secret clefts, and she bore grass flowers, and trees, with the beasts and birds proper to each. This same rain made the rivers flow and filled the hollow places with the water, so that lakes and seas came into being.”[12] The Titans and the Giants “Her (Earth) first children (with heaven) of Semi-human form were the hundred-handed giants Briareus, Gyges, and Cottus. Next appeared the three wild, one-eyed Cyclopes, builders of gigantic walls and master-smiths…..Their names were Brontes, Steropes, and Arges.”[12] Next came the “Titans: Oceanus, Hypenon, Iapetus, Themis, Memory (Mnemosyne), Phoebe also Tethys, and Cronus the wily—youngest and most terrible of her children.”[11] “Cronus hated his lusty sire Heaven (Uranus). -
Structure Analysis of the Perseus and the Cepheus B Molecular Clouds
Structure analysis of the Perseus and the Cepheus B molecular clouds Inaugural-Dissertation zur Erlangung des Doktorgrades der Mathematisch-Naturwissenschaftlichen Fakult¨at der Universit¨at zu K¨oln vorgelegt von Kefeng Sun aus VR China Koln,¨ 2008 Berichterstatter : Prof. Dr. J¨urgen Stutzki Prof. Dr. Andreas Zilges Tag der letzten m¨undlichen Pr¨ufung : 26.06.2008 To my parents and Jiayu Contents Abstract i Zusammenfassung v 1 Introduction 1 1.1 Overviewoftheinterstellarmedium . 1 1.1.1 Historicalstudiesoftheinterstellarmedium . .. 1 1.1.2 ThephasesoftheISM .. .. .. .. .. 2 1.1.3 Carbonmonoxidemolecularclouds . 3 1.2 DiagnosticsofturbulenceinthedenseISM . 4 1.2.1 The ∆-variancemethod.. .. .. .. .. 6 1.2.2 Gaussclumps ........................ 8 1.3 Photondominatedregions . 9 1.3.1 PDRmodels ........................ 12 1.4 Outline ............................... 12 2 Previous studies 14 2.1 ThePerseusmolecularcloud . 14 2.2 TheCepheusBmolecularcloud . 16 3 Large scale low -J CO survey of the Perseus cloud 18 3.1 Observations ............................ 18 3.2 DataSets .............................. 21 3.2.1 Integratedintensitymaps. 21 3.2.2 Velocitystructure. 24 3.3 The ∆-varianceanalysis. 24 3.3.1 Integratedintensitymaps. 27 3.3.2 Velocitychannelmaps . 30 3.4 Discussion.............................. 34 3.4.1 Integratedintensitymaps. 34 3.4.2 Velocitychannelmaps . 34 I II CONTENTS 3.5 Summary .............................. 38 4 The Gaussclumps analysis in the Perseus cloud 40 4.1 Resultsanddiscussions . 40 4.1.1 Clumpmass......................... 41 4.1.2 Clumpmassspectra . 42 4.1.3 Relationsofclumpsizewithlinewidthandmass . 46 4.1.4 Equilibriumstateoftheclumps . 49 4.2 Summary .............................. 53 5 Study of the photon dominated region in the IC 348 cloud 55 5.1 Datasets............................... 56 5.1.1 [C I] and 12CO4–3observationswithKOSMA . 56 5.1.2 Complementarydatasets. -
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A Compendium of Distances to Molecular Clouds in the Star Formation Handbook?,?? Catherine Zucker1, Joshua S
A&A 633, A51 (2020) Astronomy https://doi.org/10.1051/0004-6361/201936145 & c ESO 2020 Astrophysics A compendium of distances to molecular clouds in the Star Formation Handbook?,?? Catherine Zucker1, Joshua S. Speagle1, Edward F. Schlafly2, Gregory M. Green3, Douglas P. Finkbeiner1, Alyssa Goodman1,5, and João Alves4,5 1 Center for Astrophysics | Harvard & Smithsonian, 60 Garden St., Cambridge, MA 02138, USA e-mail: [email protected], [email protected] 2 Lawrence Berkeley National Laboratory, One Cyclotron Road, Berkeley, CA 94720, USA 3 Kavli Institute for Particle Astrophysics and Cosmology, Physics and Astrophysics Building, 452 Lomita Mall, Stanford, CA 94305, USA 4 University of Vienna, Department of Astrophysics, Türkenschanzstraße 17, 1180 Vienna, Austria 5 Radcliffe Institute for Advanced Study, Harvard University, 10 Garden St, Cambridge, MA 02138, USA Received 21 June 2019 / Accepted 12 August 2019 ABSTRACT Accurate distances to local molecular clouds are critical for understanding the star and planet formation process, yet distance mea- surements are often obtained inhomogeneously on a cloud-by-cloud basis. We have recently developed a method that combines stellar photometric data with Gaia DR2 parallax measurements in a Bayesian framework to infer the distances of nearby dust clouds to a typical accuracy of ∼5%. After refining the technique to target lower latitudes and incorporating deep optical data from DECam in the southern Galactic plane, we have derived a catalog of distances to molecular clouds in Reipurth (2008, Star Formation Handbook, Vols. I and II) which contains a large fraction of the molecular material in the solar neighborhood. Comparison with distances derived from maser parallax measurements towards the same clouds shows our method produces consistent distances with .10% scatter for clouds across our entire distance spectrum (150 pc−2.5 kpc). -
Iconography of the Gorgons on Temple Decoration in Sicily and Western Greece
ICONOGRAPHY OF THE GORGONS ON TEMPLE DECORATION IN SICILY AND WESTERN GREECE By Katrina Marie Heller Submitted to the Faculty of The Archaeological Studies Program Department of Sociology and Archaeology In partial fulfillment of the requirements for the degree of Bachelor of Science University of Wisconsin-La Crosse 2010 Copyright 2010 by Katrina Marie Heller All Rights Reserved ii ICONOGRAPHY OF THE GORGONS ON TEMPLE DECORATION IN SICILY AND WESTERN GREECE Katrina Marie Heller, B.S. University of Wisconsin - La Crosse, 2010 This paper provides a concise analysis of the Gorgon image as it has been featured on temples throughout the Greek world. The Gorgons, also known as Medusa and her two sisters, were common decorative motifs on temples beginning in the eighth century B.C. and reaching their peak of popularity in the sixth century B.C. Their image has been found to decorate various parts of the temple across Sicily, Southern Italy, Crete, and the Greek mainland. By analyzing the city in which the image was found, where on the temple the Gorgon was depicted, as well as stylistic variations, significant differences in these images were identified. While many of the Gorgon icons were used simply as decoration, others, such as those used as antefixes or in pediments may have been utilized as apotropaic devices to ward off evil. iii Acknowledgements I would first like to thank my family and friends for all of their encouragement throughout this project. A special thanks to my parents, Kathy and Gary Heller, who constantly support me in all I do. I need to thank Dr Jim Theler and Dr Christine Hippert for all of the assistance they have provided over the past year, not only for this project but also for their help and interest in my academic future. -
Supernova Star Maps
Supernova Star Maps Which Stars in the Night Sky Will Go Su pernova? About the Activity Allow visitors to experience finding stars in the night sky that will eventually go supernova. Topics Covered Observation of stars that will one day go supernova Materials Needed • Copies of this month's Star Map for your visitors- print the Supernova Information Sheet on the back. • (Optional) Telescopes A S A Participants N t i d Activities are appropriate for families Cre with children over the age of 9, the general public, and school groups ages 9 and up. Any number of visitors may participate. Location and Timing This activity is perfect for a star party outdoors and can take a few minutes, up to 20 minutes, depending on the Included in This Packet Page length of the discussion about the Detailed Activity Description 2 questions on the Supernova Helpful Hints 5 Information Sheet. Discussion can start Supernova Information Sheet 6 while it is still light. Star Maps handouts 7 Background Information There is an Excel spreadsheet on the Supernova Star Maps Resource Page that lists all these stars with all their particulars. Search for Supernova Star Maps here: http://nightsky.jpl.nasa.gov/download-search.cfm © 2008 Astronomical Society of the Pacific www.astrosociety.org Copies for educational purposes are permitted. Additional astronomy activities can be found here: http://nightsky.jpl.nasa.gov Star Maps: Stars likely to go Supernova! Leader’s Role Participants’ Role (Anticipated) Materials: Star Map with Supernova Information sheet on back Objective: Allow visitors to experience finding stars in the night sky that will eventually go supernova. -
Monstrous Crowns and the New Furies of Roman Epic.Pdf
Monstrous Crowns and the New Furies of Roman Epic CAMWS, April 10, 2021 Rachael Cullick [email protected] 1. Emblems of the Underworld a) in the tale of Orpheus and Eurydice (Met. 10.45-46):1 tum primum lacrimis uictarum carmine fama est Eumenidum maduisse genas; … The story is that the cheeks of the Eumenides, conquered by his song, were then wet with tears for the first time; … b) in the tale of Althaea and Meleager (Il. 9.569-72): κικλήσκουσ᾽ Ἀΐδην καὶ ἐπαινὴν Περσεφόνειαν, πρόχνυ καθεζοµένη, δεύοντο δὲ δάκρυσι κόλποι, παιδὶ δόµεν θάνατον· τῆς δ᾽ἠεροφοῖτις Ἐρινὺς ἔκλυεν ἐξ Ἐρέβεσφιν, ἀµείλιχον ἦτορ ἔχουσα. … kneeling with her robe wet with tears, calling upon Hades and dread Persephone to grant death to her son; an Erinys who walks in mist with an implacable heart heard her from Erebus. 2. Underworld administration a) Ministers of Hades (Theb. 4. 525-7): ipsum pallentem solio circumque ministras funestorum operum Eumenidas Stygiaeque seueros Iunonis thalamos et torua cubilia cerno. I see pale Hades himself on his throne, and around him the Eumenides, assistants in his deadly tasks, and the grim chamber and fierce bed of Stygian Juno. 1 The texts used are Tarrant 2004 for the Metamorphoses, Munro & Allen 1920 for the Iliad, and Hill 1983 for the Thebaid; all translations are my own. 1 b) Furies and Fates, working together (Theb. 8.9-13, 24-26): necdum illum aut trunca lustrauerat obuia taxo Eumenis, aut furuo Proserpina poste notarat coetibus adsumptum functis; quin comminus ipsa Fatorum deprensa colus, uisoque pauentes augure tunc demum rumpebant stamina Parcae.