April 2019 OBSERVER
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THE STAR FORMATION NEWSLETTER an Electronic Publication Dedicated to Early Stellar Evolution and Molecular Clouds
THE STAR FORMATION NEWSLETTER An electronic publication dedicated to early stellar evolution and molecular clouds No. 90 — 27 March 2000 Editor: Bo Reipurth ([email protected]) Abstracts of recently accepted papers The Formation and Fragmentation of Primordial Molecular Clouds Tom Abel1, Greg L. Bryan2 and Michael L. Norman3,4 1 Harvard Smithsonian Center for Astrophysics, MA, 02138 Cambridge, USA 2 Massachusetts Institute of Technology, MA, 02139 Cambridge, USA 3 LCA, NCSA, University of Illinois, 61801 Urbana/Champaign, USA 4 Astronomy Department, University of Illinois, Urbana/Champaign, USA E-mail contact: [email protected] Many questions in physical cosmology regarding the thermal history of the intergalactic medium, chemical enrichment, reionization, etc. are thought to be intimately related to the nature and evolution of pregalactic structure. In particular the efficiency of primordial star formation and the primordial IMF are of special interest. We present results from high resolution three–dimensional adaptive mesh refinement simulations that follow the collapse of primordial molecular clouds and their subsequent fragmentation within a cosmologically representative volume. Comoving scales from 128 kpc down to 1 pc are followed accurately. Dark matter dynamics, hydrodynamics and all relevant chemical and radiative processes (cooling) are followed self-consistently for a cluster normalized CDM structure formation model. Primordial molecular clouds with ∼ 105 solar masses are assembled by mergers of multiple objects that have formed −4 hydrogen molecules in the gas phase with a fractional abundance of ∼< 10 . As the subclumps merge cooling lowers the temperature to ∼ 200 K in a “cold pocket” at the center of the halo. Within this cold pocket, a quasi–hydrostatically > 5 −3 contracting core with mass ∼ 200M and number densities ∼ 10 cm is found. -
C a L E N D a R F O R 2019
Small Astronomy Calendar for Amateur Astronomers Year III 2021 Let’s welcome our 2021 Small Astronomy Calendar Edition made by our Intergalactic Astronomy Educators Fellowship (IGAEF)’s team. In 2021, many amateur astronomers asked for calculations for more specific geographical locations. This year we added new useful calculated positions and coordinates for everyone in the world to use. You should check this calendar every month, specifically the lunar occultations pages for your observation point. There are many interesting and unique events that might not happen every year, because of the different parameters of the Moon orbit. Our hope is to fulfill your expectations. We would like to receive suggestions and feedback. You can find the editor’s email in the last page of the calendar. We appreciate your support and we are looking forward to having a good observational year, and a better and more complete calendar for this first year of a new decade. Index 3 - Calendar for 2021 4 – What is the Intergalactic Astronomy Educators Fellowship (IGAEF) 5 - Time Zones and Universal Time 6 - Phases of the Moon 2021 7 – Physical Ephemeris for the Moon 2021 10 - Local Time (EST) of MOONRISE 2021 11 - Local Time (EST) of MOONSET 2021 12 - Local time (EST) of planets rise and set 2021 15 - Diary of Astronomical Phenomena 2021 21 - Lunar eclipses 23 - Solar Eclipses 25 - Meteor Showers for 2021 26 – 2021 UPCOMING COMETS 27 - Satellites of Jupiter 2021 36 – Mutual Events of Jupiter Satellites 2021 39 - Julian Day Number, Apparent Sidereal Time, Obliquity -
Winter Observing Notes
Wynyard Planetarium & Observatory Winter Observing Notes Wynyard Planetarium & Observatory PUBLIC OBSERVING – Winter Tour of the Sky with the Naked Eye NGC 457 CASSIOPEIA eta Cas Look for Notice how the constellations 5 the ‘W’ swing around Polaris during shape the night Is Dubhe yellowish compared 2 Polaris to Merak? Dubhe 3 Merak URSA MINOR Kochab 1 Is Kochab orange Pherkad compared to Polaris? THE PLOUGH 4 Mizar Alcor Figure 1: Sketch of the northern sky in winter. North 1. On leaving the planetarium, turn around and look northwards over the roof of the building. To your right is a group of stars like the outline of a saucepan standing up on it’s handle. This is the Plough (also called the Big Dipper) and is part of the constellation Ursa Major, the Great Bear. The top two stars are called the Pointers. 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 to the left, 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 right 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. Check with binoculars. © Rob Peeling, CaDAS, 2007 version 2.0 Wynyard Planetarium & Observatory PUBLIC OBSERVING – Winter Polaris, Kochab and Pherkad mark the constellation Ursa Minor, the Little Bear. -
Binocular Double Star Logbook
Astronomical League Binocular Double Star Club Logbook 1 Table of Contents Alpha Cassiopeiae 3 14 Canis Minoris Sh 251 (Oph) Psi 1 Piscium* F Hydrae Psi 1 & 2 Draconis* 37 Ceti Iota Cancri* 10 Σ2273 (Dra) Phi Cassiopeiae 27 Hydrae 40 & 41 Draconis* 93 (Rho) & 94 Piscium Tau 1 Hydrae 67 Ophiuchi 17 Chi Ceti 35 & 36 (Zeta) Leonis 39 Draconis 56 Andromedae 4 42 Leonis Minoris Epsilon 1 & 2 Lyrae* (U) 14 Arietis Σ1474 (Hya) Zeta 1 & 2 Lyrae* 59 Andromedae Alpha Ursae Majoris 11 Beta Lyrae* 15 Trianguli Delta Leonis Delta 1 & 2 Lyrae 33 Arietis 83 Leonis Theta Serpentis* 18 19 Tauri Tau Leonis 15 Aquilae 21 & 22 Tauri 5 93 Leonis OΣΣ178 (Aql) Eta Tauri 65 Ursae Majoris 28 Aquilae Phi Tauri 67 Ursae Majoris 12 6 (Alpha) & 8 Vul 62 Tauri 12 Comae Berenices Beta Cygni* Kappa 1 & 2 Tauri 17 Comae Berenices Epsilon Sagittae 19 Theta 1 & 2 Tauri 5 (Kappa) & 6 Draconis 54 Sagittarii 57 Persei 6 32 Camelopardalis* 16 Cygni 88 Tauri Σ1740 (Vir) 57 Aquilae Sigma 1 & 2 Tauri 79 (Zeta) & 80 Ursae Maj* 13 15 Sagittae Tau Tauri 70 Virginis Theta Sagittae 62 Eridani Iota Bootis* O1 (30 & 31) Cyg* 20 Beta Camelopardalis Σ1850 (Boo) 29 Cygni 11 & 12 Camelopardalis 7 Alpha Librae* Alpha 1 & 2 Capricorni* Delta Orionis* Delta Bootis* Beta 1 & 2 Capricorni* 42 & 45 Orionis Mu 1 & 2 Bootis* 14 75 Draconis Theta 2 Orionis* Omega 1 & 2 Scorpii Rho Capricorni Gamma Leporis* Kappa Herculis Omicron Capricorni 21 35 Camelopardalis ?? Nu Scorpii S 752 (Delphinus) 5 Lyncis 8 Nu 1 & 2 Coronae Borealis 48 Cygni Nu Geminorum Rho Ophiuchi 61 Cygni* 20 Geminorum 16 & 17 Draconis* 15 5 (Gamma) & 6 Equulei Zeta Geminorum 36 & 37 Herculis 79 Cygni h 3945 (CMa) Mu 1 & 2 Scorpii Mu Cygni 22 19 Lyncis* Zeta 1 & 2 Scorpii Epsilon Pegasi* Eta Canis Majoris 9 Σ133 (Her) Pi 1 & 2 Pegasi Δ 47 (CMa) 36 Ophiuchi* 33 Pegasi 64 & 65 Geminorum Nu 1 & 2 Draconis* 16 35 Pegasi Knt 4 (Pup) 53 Ophiuchi Delta Cephei* (U) The 28 stars with asterisks are also required for the regular AL Double Star Club. -
Ov\,E <1000{ Tayget
oV\,e <1000{ TaYget w~tVi SOVlA.e otViey s~gVits wortVt see~v\'g wVi~Le You'ye ~v\, tVie Ne~gVtboYVioofi MlAycltl GLustey M4g wLtVi ~cn'bov\" stClr X CClv\"~rL Cl V\.,c{ Cl v\"L~e grou-p of stClYS Cl rouV\.,c{ "B>etCl CCl V\.,Ls M~v\"orLs Cluster M48, a magnitude 5.5 open star cluster in the constellation Hydra, was first discovered by comet-hunter Charles Messier in 1771 but, because Messier misstated its coordinates, it was "lost" until 1934, when German astronomer Oswalt Thomas demonstrated that the cluster Messier described was NGC 2458. The cluster is shown slightly right of center near the bottom of the chart, along with other nearby stars that we will use in this month's hunt: • Pollux • • • • • • Gamma M44 • Cancer. • • ~ • ;. I • ·HYdra~ Procyon •• • Sextans • • Monoceros • 0 ~\ • M48 . To find M48 using binoculars or a finderscope, start at Procyon, the bright mag 0.3 star at the SE corner of The Winter Hexagon. Procyon is the 8th brightest star in the sky, and quite close to us, at a distance of only 11~ light years. It was named Procyon, meaning "Before the Dog," because it rises just before Sirius, The Dog Star: that was important because Sirius heralded the annual flooding of the Nile River, which was crucial to the life of ancient Egypt. Just over 4° NW of Procyon is mag 2.9 blue dwarf Beta Canis Minoris, which forms a pretty lYz ° binocular group with a mag 4.3 orange giant and a mag 5.0 yellow giant. -
The Astronomy of the Kamilaroi and Euahlayi Peoples and Their Neighbours
The Astronomy of the Kamilaroi and Euahlayi Peoples and Their Neighbours By Robert Stevens Fuller A thesis submitted to the Faculty of Arts at Macquarie University for the degree of Master of Philosophy November 2014 © Robert Stevens Fuller i I certify that the work in this thesis entitled “The Astronomy of the Kamilaroi and Euahlayi Peoples and Their Neighbours” has not been previously submitted for a degree nor has it been submitted as part of requirements for a degree to any other university or institution other than Macquarie University. I also certify that the thesis is an original piece of research and it has been written by me. Any help and assistance that I have received in my research work and the preparation of the thesis itself has been appropriately acknowledged. In addition, I certify that all information sources and literature used are indicated in the thesis. The research presented in this thesis was approved by Macquarie University Ethics Review Committee reference number 5201200462 on 27 June 2012. Robert S. Fuller (42916135) ii This page left intentionally blank Contents Contents .................................................................................................................................... iii Dedication ................................................................................................................................ vii Acknowledgements ................................................................................................................... ix Publications .............................................................................................................................. -
THE STAR FORMATION NEWSLETTER an Electronic Publication Dedicated to Early Stellar Evolution and Molecular Clouds
THE STAR FORMATION NEWSLETTER An electronic publication dedicated to early stellar evolution and molecular clouds No. 193 — 13 Jan 2009 Editor: Bo Reipurth ([email protected]) Abstracts of recently accepted papers [O i] sub-arcsecond study of a microjet from an intermediate mass young star: RY Tau V. Agra-Amboage1, C. Dougados1, S. Cabrit2, P.J.V. Garcia3,4,1 and P. Ferruit5 1 Laboratoire d’Astrophysique de l’Observatoire de Grenoble, UMR 5521 du CNRS, 38041 Grenoble C´edex 9, France 2 LERMA, Observatoire de Paris, UMR 8112 du CNRS, 61 Avenue de l’Observatoire, 75014 Paris, France 3 Departamento de Engenharia Fisica,Faculdade de Engenharia,Universidade do Porto, 4200-465 Porto, Portugal 4 Centro de Astrofisica, Universidade do Porto, Porto, Portugal 5 CRAL, Observatoire de Lyon, 9 Av. Charles Andr´e, F-69230 St. Genis Laval, France E-mail contact: Catherine.Dougados at obs.ujf-grenoble.fr High-resolution studies of microjets in T Tauri stars (cTTs) reveal key information on the jet collimation and launching mechanism, but only a handful of systems have been mapped so far. We perform a detailed study of the microjet from the 2 M⊙ young star RY Tau, to investigate the influence of its higher stellar mass and claimed close binarity on jet properties. Spectro-imaging observations of RY Tau were obtained in [O i]λ6300 with resolutions of 0.4′′ and 135 km s−1, using the integral field spectrograph OASIS at the Canada-France-Hawaii Telescope. Deconvolved images reach a resolution of 0.2′′. The blueshifted jet is detected within 2′′ of the central star. -
Culmination of a Constellation
Culmination of a Constellation Over any night, stars and constellations in the sky will appear to move from east to west due to the Earth’s rotation on its axis. A constellation will culminate (reach its highest point in the sky for your location) when it centres on the meridian - an imaginary line that runs across the sky from north to south and also passes through the zenith (the point high in the sky directly above your head). For example: When to Observe Constellations The taBle shows the approximate time (AEST) constellations will culminate around the middle (15th day) of each month. Constellations will culminate 2 hours earlier for each successive month. Note: add an hour to the given time when daylight saving time is in effect. The time “12” is midnight. Sunrise/sunset times are rounded off to the nearest half an hour. Sun- Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Rise 5am 5:30 6am 6am 7am 7am 7am 6:30 6am 5am 4:30 4:30 Set 7pm 6:30 6pm 5:30 5pm 5pm 5pm 5:30 6pm 6pm 6:30 7pm And 5am 3am 1am 11pm 9pm Aqr 5am 3am 1am 11pm 9pm Aql 4am 2am 12 10pm 8pm Ara 4am 2am 12 10pm 8pm Ari 5am 3am 1am 11pm 9pm Aur 10pm 8pm 4am 2am 12 Boo 3am 1am 11pm 9pm 7pm Cnc 1am 11pm 9pm 7pm 3am CVn 3am 1am 11pm 9pm 7pm CMa 11pm 9pm 7pm 3am 1am Cap 5am 3am 1am 11pm 9pm 7pm Car 2am 12 10pm 8pm 6pm Cen 4am 2am 12 10pm 8pm 6pm Cet 4am 2am 12 10pm 8pm Cha 3am 1am 11pm 9pm 7pm Col 10pm 8pm 4am 2am 12 Com 3am 1am 11pm 9pm 7pm CrA 3am 1am 11pm 9pm 7pm CrB 4am 2am 12 10pm 8pm Crv 3am 1am 11pm 9pm 7pm Cru 3am 1am 11pm 9pm 7pm Cyg 5am 3am 1am 11pm 9pm 7pm Del -
February 2000 the Albuquerque Astronomical Society News Letter
Back to List of Newsletters February 2000 This special HTML version of our newsletter contains most of the information published in the "real" Sidereal Times . All information is copyrighted by TAAS. Permission for other amateur astronomy associations is granted provided proper credit is given. Table of Contents Departments Calendars Lead Story: Ode to Spring: The Messier Marathon Presidents Update The Board Meeting Observatory Committee No report this month Last Month's General Meeting Recap Next General Meeting Observer's Page What's Up for February No report this month Ask the Experts: The Kids' Corner ATM Corner: Star Myths and More UNM Campus Observatory Report Docent News Astronomy 101 Astronomical Computing No report this month Internet Info GNTO News Trivia Question No trivia this month Letters to the Editor Lost and Found No items this month Classified Ads Feature Stories New CCD camera (and class) Project Astro New Mexico State Parks Rio Grande Nature Center Star Party TAAS Astronomy Day Call to Battle Library News Science Fair Judges Needed Astronomy Speaker Needed Misc Stuff Please note: TAAS offers a Safety Escort Service to those attending monthly meetings on the UNM campus. Please contact the President or any board member during social hour after the meeting if you wish assistance, and a Society member will happily accompany you to your car. Calendars Calendar Images March 2000 Calendar o GIF version (~65K) o PDF version (~20K) April 2000 Calendar o GIF version (~65K) o PDF version (~20K) TAAS Calendar page Ode to Spring: The Messier Marathon by Dave Brown Ah the approach of Spring, who can resist its overwhelming appeal. -
Macrocosmo Nº24
A PRIMEIRA REVISTA ELETRÔNICA BRASILEIRA EXCLUSIVA DE ASTRONOMIA macroCOSMO .com ISSN 1808-0731 Ano II - Edição n° 24 - Novembro de 2005 Eclipse Anular 3 de outubro de 2005 O O ^^Q uando a W Lua S o l oculta o w l Cratera de Colônia 25 anos da Aspectos Gerais The Planetary Society revista macroCOSMO .com Ano II - Edição n° 24 - Novembro de 2005 Editorial Redação [email protected] Assim como tantos outros fenômenos naturais, para as primeiras civilizações, os eclipses já foram atribuídos à sinais de múltiplas Diretor Editor Chefe divindades. Eclipses Solares e Lunares, eventos estes repentinos que Hemerson Brandão quebravam a imutabilidade do céu, eram interpretados como [email protected] manifestações de ira dos deuses, predizendo morte de chefes de estado, grandes catástrofes, guerras, e várias pragas. Diagramadores Mesmo nos dias de hoje, com toda a tecnologia e conhecimento Hemerson Brandão adquirido é comum pessoas ficarem receosas com o desaparecimento [email protected] repentino temporário do Sol ou da Lua. Exemplo disso são alguns cristãos Rodolfo Saccani fanáticos, que afirmam que os eclipses são indícios do “fim do mundo”. [email protected] Durante a história, enquanto alguns povos nômades cultivavam um Sharon Camargo temor mítico por esses fenômenos, povos sedentários se empenhavam [email protected] em entender sobre a periodicidade desses fenômenos raros, tentando encontrar padrões que permitissem a previsão dos eclipses. Para isso, Revisão muitos povos erigiram grandes templos e observatórios para estudo e Tasso Napoleão previsão de eclipses além de outros fenômenos celestes. Há quem afirme [email protected] que as pedras megalíticas de Stonehenge, nas ilhas britânicas, estão Walkiria Schulz dispostas numa posição que permitia ao povo que o construiu, prever [email protected] eclipses, há mais de 3700 anos. -
The T Tauri Star RY Tauri As a Case Study of the Inner Regions of Circumstellar Dust Disks
A&A 478, 779–793 (2008) Astronomy DOI: 10.1051/0004-6361:20077049 & c ESO 2008 Astrophysics The T Tauri star RY Tauri as a case study of the inner regions of circumstellar dust disks A. A. Schegerer1,S.Wolf1, Th. Ratzka2, and Ch. Leinert1 1 Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany e-mail: [email protected] 2 Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany Received 3 January 2007 / Accepted 13 November 2007 ABSTRACT Aims. We study the inner region (∼1.0 AU up to a few 10 AUs) of the circumstellar disk around the “classical” T Tauri star RY Tau. Our aim is to find a physical description satisfying the available interferometric data, obtained with the mid-infrared interferometric instrument at the Very Large Telescope Interferometer, as well as the spectral energy distribution in the visible to millimeter wave- length range. We also compare the findings with the results of similar studies, including those of intermediate-mass Herbig Ae/Be stars. Methods. Our analysis is done within the framework of a passively heated circumstellar disk, which is optionally supplemented by the effects of accretion and an added envelope. To achieve a more consistent and realistic model, we used our continuum transfer code MC3D. In addition, we studied the shape of the 10 µm silicate emission feature in terms of the underlying dust population, both for single-dish and for interferometric measurements. Results. We show that a modestly flaring disk model with accretion can explain both the observed spectral energy distribution and the mid-infrared visibilities obtained with the mid-infrared infrared instrument. -
Fuor and Exor Variables: a NIR High-Resolution Spectroscopic Survey Joseph Liskowsky Clemson University, [email protected]
Clemson University TigerPrints All Theses Theses 12-2010 FUor and EXor Variables: A NIR High-Resolution Spectroscopic Survey Joseph Liskowsky Clemson University, [email protected] Follow this and additional works at: https://tigerprints.clemson.edu/all_theses Part of the Astrophysics and Astronomy Commons Recommended Citation Liskowsky, Joseph, "FUor and EXor Variables: A NIR High-Resolution Spectroscopic Survey" (2010). All Theses. 977. https://tigerprints.clemson.edu/all_theses/977 This Thesis is brought to you for free and open access by the Theses at TigerPrints. It has been accepted for inclusion in All Theses by an authorized administrator of TigerPrints. For more information, please contact [email protected]. FUor and EXor Variables, a NIR High-Resolution Spectroscopic Survey A Thesis Presented to the Graduate School of Clemson University In Partial Fulfillment of the Requirements for the Degree Master of Science Physics and Astronomy by Joseph Paul Liskowsky Dec 2010 Accepted by: Dr. Sean Brittain, Committee Chair Dr. Dieter Hartmann Dr. Mark Leising Dr. Bradley Meyer Abstract To better understand the labyrinth of heating and cooling processes in YSOs (young stellar objects), we study systems where there exists a large variability in the heating of this gas due to accretion. This research project focuses on several classes of early young eruptable T-Tauri stars, namely the FUors, the EXors and the so-called FU Ori-like, which all have the property of large amplitude oscillations in accretion rate. Each of these categories may well represent specific stages in early low-mass stellar evolution. While these objects have specific spectroscopic and circumstellar diagnostics (as means of identification) our research suggests that there are at least several objects that defy (typical) classification.