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145, September 2010
British Astronomical Association VARIABLE STAR SECTION CIRCULAR No 145, September 2010 Contents EG Andromedae Light Curve ................................................... inside front cover From the Director ............................................................................................... 1 Letter Page. Visual Observing ............................................................................ 4 Epsilon Aurigae Spectroscopically at Mid Eclipse .......................................... 5 Eclipsing Binary News ...................................................................................... 7 AO Cassiopeiae Phase Diagram ............................................................ 9 PV Cephei and Gyulbudaghian’s Nebula ........................................................ 10 WR140 Periastron Campaign Update .............................................................. 12 VSS Meeting, Pendrell Hall. The Central Stars of Planetary Nebulae ............ 14 RR Coronae Borealis 1993-2004 ...................................................................... 16 TU Cassiopeiae Phase Diagram 2005-2010 ..................................................... 18 Binocular Priority List ..................................................................................... 19 Eclipsing Binary Predictions ............................................................................ 20 Charges for Section Publications .............................................. inside back cover Guidelines for Contributing to the Circular ............................. -
Across the Atlantic: Canada's MOST
The CoRoT Legacy Book c The authors, 2016 DOI: 10.1051/978-2-7598-1876-1.c014 I.4 Across the Atlantic: Canada’s MOST J. M. Matthews Department of Physics & Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, British Columbia, V6T 1Z1 Canada contractors were Dynacon, and CRESTech (Centre for 1. Windows of opportunity Research in Earth & Space Technology). John Pazder be- In the mid-1990s, it seemed like the only way Canadian came the optics designer and Peter Ceravolo would fabri- astronomers could have direct access to space-based ultra- cate the main optics. precise photometry for asteroseismology was to be a minor The project was renamed MOST, for Microvariabil- partner in a European satellite mission. In fact, with this ity & Oscillations of STars/Microvariabilit´eet Oscillations in mind, in 1996 Jaymie Matthews (University of British STellaire. Its original scientific objectives were: (1) astero- Columbia) submitted an unsolicited proposal to the Cana- seismology of solar-type stars; (2) asteroseismology of roAp dian Space Agency for Canada to participate in Eddington (rapidly oscillating Ap) stars; (3) characterization of Wolf- at a level of a few Can$M. Rayet star winds and search for pulsations; and (4) mea- Then two unexpected windows opened right after one surement of exoplanet albedo. another. MOST won the Phase A competition and was selected The first window was built by aerospace engineer Kieran to be Canada's first microsatellite and first space telescope. Carroll and opened by astronomer Slavek Rucinski. Rucin- ski attended a talk by Carroll whose company, Dynacon Inc. had developed a new Attitude Control System (ACS). -
Paul Willard Merrill
NATIONAL ACADEMY OF SCIENCES P A U L W I L L A R D M ERRILL 1887—1961 A Biographical Memoir by OL I N C . W I L S O N Any opinions expressed in this memoir are those of the author(s) and do not necessarily reflect the views of the National Academy of Sciences. Biographical Memoir COPYRIGHT 1964 NATIONAL ACADEMY OF SCIENCES WASHINGTON D.C. PAUL WILLARD MERRILL August i$, 1887—July ig, ig6i BY OLIN C. WILSON A STRONOMY, by its very nature, has always been pre-eminently an 1\- observational science. Progress in astronomy has come about in two ways: first, by the use of more and more powerful methods of observation and, second, by the application of improved physical theory in seeking to interpret the observations. Approximately one hundred years ago the pioneers in stellar spectroscopy began to lay the foundations of modern astrophysics by applying the spectroscope to the study of celestial bodies. Certainly during most of this period observation has led the way in the attack on the unknown. Even today, although theory has made enormous strides in the past thirty or forty years, observation continues to uncover phenomena which were unanticipated by the theorists and which are, in some instances, far from easy to account for. The chosen field of the subject of this memoir was stellar spectros- copy, and his active career spanned the second half of the period since work was begun in that branch of astronomy. To some extent his professional life formed a link between the early pioneering times, when theoretical explanation of the observed phenomena was virtually nonexistent, and the present day. -
The Detectability of Nightside City Lights on Exoplanets
Draft version September 6, 2021 Typeset using LATEX twocolumn style in AASTeX63 The Detectability of Nightside City Lights on Exoplanets Thomas G. Beatty1 1Department of Astronomy and Steward Observatory, University of Arizona, Tucson, AZ 85721; [email protected] ABSTRACT Next-generation missions designed to detect biosignatures on exoplanets will also be capable of plac- ing constraints on the presence of technosignatures (evidence for technological life) on these same worlds. Here, I estimate the detectability of nightside city lights on habitable, Earth-like, exoplan- ets around nearby stars using direct-imaging observations from the proposed LUVOIR and HabEx observatories. I use data from the Soumi National Polar-orbiting Partnership satellite to determine the surface flux from city lights at the top of Earth's atmosphere, and the spectra of commercially available high-power lamps to model the spectral energy distribution of the city lights. I consider how the detectability scales with urbanization fraction: from Earth's value of 0.05%, up to the limiting case of an ecumenopolis { or planet-wide city. I then calculate the minimum detectable urbanization fraction using 300 hours of observing time for generic Earth-analogs around stars within 8 pc of the Sun, and for nearby known potentially habitable planets. Though Earth itself would not be detectable by LUVOIR or HabEx, planets around M-dwarfs close to the Sun would show detectable signals from city lights for urbanization levels of 0.4% to 3%, while city lights on planets around nearby Sun-like stars would be detectable at urbanization levels of & 10%. The known planet Proxima b is a particu- larly compelling target for LUVOIR A observations, which would be able to detect city lights twelve times that of Earth in 300 hours, an urbanization level that is expected to occur on Earth around the mid-22nd-century. -
R Aquarii: Understanding the Mystery of Its Jets by Model Comparison Michelle Marie Risse Iowa State University
Iowa State University Capstones, Theses and Graduate Theses and Dissertations Dissertations 2009 R Aquarii: Understanding the mystery of its jets by model comparison Michelle Marie Risse Iowa State University Follow this and additional works at: https://lib.dr.iastate.edu/etd Part of the Physics Commons Recommended Citation Risse, Michelle Marie, "R Aquarii: Understanding the mystery of its jets by model comparison" (2009). Graduate Theses and Dissertations. 10565. https://lib.dr.iastate.edu/etd/10565 This Thesis is brought to you for free and open access by the Iowa State University Capstones, Theses and Dissertations at Iowa State University Digital Repository. It has been accepted for inclusion in Graduate Theses and Dissertations by an authorized administrator of Iowa State University Digital Repository. For more information, please contact [email protected]. R Aquarii: Understanding the mystery of its jets by model comparison by Michelle Marie Risse A thesis submitted to the graduate faculty in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE Major: Astrophysics Program of Study Committee: Lee Anne Willson, Major Professor Steven D. Kawaler Craig A. Ogilvie David B. Wilson Iowa State University Ames, Iowa 2009 Copyright c Michelle Marie Risse, 2009. All rights reserved. ii TABLE OF CONTENTS LISTOFTABLES ................................... iv LISTOFFIGURES .................................. v CHAPTER1. Intent ................................. 1 CHAPTER2. Introduction ............................. 2 2.1 -
1903Aj 23 . . . 22K 22 the Asteojsomic Al
22 THE ASTEOJSOMIC AL JOUENAL. Nos- 531-532 22K . Taking into account the smallness of the weights in- concerned. Through the use of these tables the positions . volved, the individual differences which make up the and motions of many stars not included in the present 23 groups in the preceding table agree^very well. catalogue can be brought into systematic harmony with it, and apparently without materially less accuracy for the in- dividual stars than could be reached by special compu- Tables of Systematic Correction for N2 and A. tations for these stars in conformity with the system of B. 1903AJ The results of the foregoing comparisons. have been This is especially true of the star-places computed by utilized to form tables of systematic corrections for ISr2, An, Dr. Auwers in the catalogues, Ai and As. As will be seen Ai and As. In right-ascension no distinction is necessary by reference to the catalogue the positions and motions of between the various catalogues published by Dr. Auwers, south polar stars taken from N2 agree better with the beginning with the Fundamental-G at alo g ; but in decli- results of this investigation than do those taken from As, nation the distinction between the northern, intermediate, which, in turn, are quoted from the Cape Catalogue for and southern catalogues must be preserved, so far as is 1890. SYSTEMATIC COBEECTIOEB : CEDEE OF DECLINATIONS. Eight-Ascensions ; Cokrections, ¿las and 100z//xtf. Declinations; Corrections, Æs and IOOzZ/x^. B — ISa B —A B —N2 B —An B —Ai âas 100 â[is âas 100 âgô âSs 100 -
Uranometría Argentina Bicentenario
URANOMETRÍA ARGENTINA BICENTENARIO Reedición electrónica ampliada, ilustrada y actualizada de la URANOMETRÍA ARGENTINA Brillantez y posición de las estrellas fijas, hasta la séptima magnitud, comprendidas dentro de cien grados del polo austral. Resultados del Observatorio Nacional Argentino, Volumen I. Publicados por el observatorio 1879. Con Atlas (1877) 1 Observatorio Nacional Argentino Dirección: Benjamin Apthorp Gould Observadores: John M. Thome - William M. Davis - Miles Rock - Clarence L. Hathaway Walter G. Davis - Frank Hagar Bigelow Mapas del Atlas dibujados por: Albert K. Mansfield Tomado de Paolantonio S. y Minniti E. (2001) Uranometría Argentina 2001, Historia del Observatorio Nacional Argentino. SECyT-OA Universidad Nacional de Córdoba, Córdoba. Santiago Paolantonio 2010 La importancia de la Uranometría1 Argentina descansa en las sólidas bases científicas sobre la cual fue realizada. Esta obra, cuidada en los más pequeños detalles, se debe sin dudas a la genialidad del entonces director del Observatorio Nacional Argentino, Dr. Benjamin A. Gould. Pero nada de esto se habría hecho realidad sin la gran habilidad, el esfuerzo y la dedicación brindada por los cuatro primeros ayudantes del Observatorio, John M. Thome, William M. Davis, Miles Rock y Clarence L. Hathaway, así como de Walter G. Davis y Frank Hagar Bigelow que se integraron más tarde a la institución. Entre éstos, J. M. Thome, merece un lugar destacado por la esmerada revisión, control de las posiciones y determinaciones de brillos, tal como el mismo Director lo reconoce en el prólogo de la publicación. Por otro lado, Albert K. Mansfield tuvo un papel clave en la difícil confección de los mapas del Atlas. La Uranometría Argentina sobresale entre los trabajos realizados hasta ese momento, por múltiples razones: Por la profundidad en magnitud, ya que llega por vez primera en este tipo de empresa a la séptima. -
Serpens – the Serpent
A JPL Image of surface of Mars, and JPL Ingenuity Helicioptor illustration, in flight Monthly Meeting May 10th at 7:00 PM at HRPO, and via Jitsi (Monthly meetings are on 2nd Mondays at Highland Road Park Observatory, will also broadcast via. (meet.jit.si/BRASMeet). PRESENTATION: Dr. Alan Hale, professional astronomer and co-discoverer of Comet Hale-Bopp, among other endeavors. What's In This Issue? President’s Message Member Meeting Minutes Business Meeting Minutes Outreach Report Light Pollution Committee Report Globe at Night SubReddit and Discord Messages from the HRPO REMOTE DISCUSSION Solar Viewing International Astronomy Day American Radio Relay League Field Day Observing Notes: Serpens - The Serpent & Mythology Like this newsletter? See PAST ISSUES online back to 2009 Visit us on Facebook – Baton Rouge Astronomical Society BRAS YouTube Channel Baton Rouge Astronomical Society Newsletter, Night Visions Page 2 of 20 May 2021 President’s Message Ahhh, welcome to May, the last pleasant month in Louisiana before the start of the hurricane season and the brutal summer months that follow. April flew by pretty quickly, and with the world slowly thawing from the long winter, why shouldn’t it? To celebrate, we decided we’re going to try to start holding our monthly meetings at Highland Road Park Observatory again, only with the added twist of incorporating an on-line component for those who for whatever reason don’t feel like making it out. To that end, we’ll have both our usual live broadcast on the BRAS YouTube channel and the Brasmeet page on Jitsi—which is where our out of town guests and, at least this month, our guest speaker can join us. -
Helle Kometen Astroreise in Die USA Deep-Sky-Zeichnungen Ein Praktikum Beim DLR Seite 78 Seite 93 Seite 104 Editorial 1
www.vds-astro.de ISSN 1615-0880 III/2012 Nr. 42 Zeitschrift der Vereinigung der Sternfreunde e.V. Schwerpunktthema Helle Kometen Astroreise in die USA Deep-Sky-Zeichnungen Ein Praktikum beim DLR Seite 78 Seite 93 Seite 104 Editorial 1 Liebe Mitglieder, liebe Sternfreunde, besondere Himmelsschauspiele sind das Salz in der Suppe des Hobby-Astrono- men. In diesem Sinne war der Venustransit vom 5./6. Juni ein ganz besonderes Gericht, dessen Geschmack auch jetzt sicher noch viele auf der Zunge spüren. Um Ihnen erste Bilder des Vorübergangs der Venus vor der Sonnenscheibe zeigen zu können, erscheint diese Ausgabe des Journals für Astronomie einige Tage später als geplant. Doch damit nicht genug: Für die übernächste Ausgabe wird ein ganzes Schwerpunktthema den Venustransit Revue passieren lassen! Senden Sie uns Ihre Beiträge, ganz gleich ob ausführlicher Erlebnisbericht oder einfach die schönsten Fotos. Einsendeschluss ist sofort nach Erscheinen dieser Ausgabe am 1. August 2012; Adresse: [email protected]. Vielleicht hatten Sie Gelegenheit, die Bedeckung des Planeten Jupiter durch den abnehmenden Mond am Morgen des 15. Juli beobachten zu können. Auch in diesem Fall druckt die VdS gerne Ihre Ergebnisse ab. Es muss ja nicht immer ein großer Artikel sein: Für ein Foto mit kurzer Beschreibung hat das VdS-Journal in der Rubrik „Beobachterforum“ immer Platz. Das Schwerpunktthema dieser Ausgabe fasst die hellen Kometen der letzten 50 Jahre zusammen. Von „Knallern“ wie den berühmten Kometen C/1975 V1 (West), C/1997 O1 (Hale-Bopp) und C/1996 B2 (Hyakutake) über „Flops“ wie dem enttäuschenden C/1973 E1 (Kohoutek) bis zur Weihnachtsüberraschung 2011 Titelbild: „Lovejoy“ – Kometen sorgen immer wieder für spektakuläre Himmelsschauspiele. -
58/1964 the Australian National University
~ . ,.r; . ~ • 58/1964 •4.: • THE AUSTRALIAN NATIONAL UNIVERSITY RESEARCH SCHOOL OF PHYSICAL SCIENCES DEPARTMENT OF ASTRONOMY ANNUAL REPORT 1963 Staff Professor of Astronomy and B.J. Bok, Ph.D. Director of Observatory Professor of Optics T. Dunham, Ph.D. Reader and Deputy Director A.R. Hogg, D.Sc., F. Inst. P., (Administration) F.A.A. Reader and Assistant Director S.C.B. Gascoigne, M.Sc., Ph.D. (Research) Reader B.E. Westerlund, Ph.D. Head of Section on Positional H.J.McK. Abraham, M.Sc. Astronomy (Senior Fellow) Senior Fellows w. Buscombe, M.A., Ph.D. Th. Walraven, Ph.D. Fellows H. R. F. Go 11 now, Dr. Phi 1. A. Przybylski, Ph.D. A.W. Rodgers, Ph.D. L. Searle, Ph.D. Research Engineers (Fellows) K. Gottlieb, Dip. Ing. L.C. Witchard, B.Sc. Visiting Fellow Madge G. Adam, D. Phil. Research Assistants J.M. Basinski P. Morris Kennedy Honorary Professor R.V.d.R. Woolley, Kt., O.B.E., M.Sc., F.A.Ao, F.R.S., Astronomer Royal Honorary Fellow c. Roslund, Ph.D. Research Scholars R. Bhavilai, M.Sc. R.D. Ekers, B.Sc. J. Koehler, B.Sc. D.K. Milne, B.sc. R.M. Price, B.Sc. LoF. Smith, B.Sc. N. Visvanathan, B.Sc. B.L. Webster, B.Sc. Three major appointments were made during the year: that of Dr. Walraven to the post of Senior Fellow, Dr. Searle to the post of Fellow and Mr. Witchard to the post of Research Engineer. At the end of the year our Workshop Foreman, Mr. H.J. -
The COLOUR of CREATION Observing and Astrophotography Targets “At a Glance” Guide
The COLOUR of CREATION observing and astrophotography targets “at a glance” guide. (Naked eye, binoculars, small and “monster” scopes) Dear fellow amateur astronomer. Please note - this is a work in progress – compiled from several sources - and undoubtedly WILL contain inaccuracies. It would therefor be HIGHLY appreciated if readers would be so kind as to forward ANY corrections and/ or additions (as the document is still obviously incomplete) to: [email protected]. The document will be updated/ revised/ expanded* on a regular basis, replacing the existing document on the ASSA Pretoria website, as well as on the website: coloursofcreation.co.za . This is by no means intended to be a complete nor an exhaustive listing, but rather an “at a glance guide” (2nd column), that will hopefully assist in choosing or eliminating certain objects in a specific constellation for further research, to determine suitability for observation or astrophotography. There is NO copy right - download at will. Warm regards. JohanM. *Edition 1: June 2016 (“Pre-Karoo Star Party version”). “To me, one of the wonders and lures of astronomy is observing a galaxy… realizing you are detecting ancient photons, emitted by billions of stars, reduced to a magnitude below naked eye detection…lying at a distance beyond comprehension...” ASSA 100. (Auke Slotegraaf). Messier objects. Apparent size: degrees, arc minutes, arc seconds. Interesting info. AKA’s. Emphasis, correction. Coordinates, location. Stars, star groups, etc. Variable stars. Double stars. (Only a small number included. “Colourful Ds. descriptions” taken from the book by Sissy Haas). Carbon star. C Asterisma. (Including many “Streicher” objects, taken from Asterism. -
Oca Club Meeting Star Parties Coming Up
August 2004 Free to members, subscriptions $12 for 12 issues Volume 31, Number 8 OCA CLUB MEETING STAR PARTIES COMING UP The free and open club The Black Star Canyon site will be open this The next session of the meeting will be held Friday, month on August 7th. The Anza site will be Beginners Class will be held on August 13th at 7:30 PM in open August 14th. Members are Friday August 6th (and next the Irvine Lecture Hall of the encouraged to check the website calendar, month on September 3rd) at the Hashinger Science Center for the latest updates on star parties and Centennial Heritage Museum at Chapman University in other events. (formerly the Discovery Museum Orange. The featured of Orange County) at 3101 speaker this month is Please check the website calendar for the West Harvard Street in Santa OCA’s own Liam Kennedy, outreach events this month! Volunteers Ana. speaking about his recent are always welcome! GOTO SIG: Aug. 2nd, Sept. date experiences observing the You are also reminded to check the web TBA Venus Transit from Iran. site frequently for updates to the calendar Astro-Imagers SIG: Aug. 17th, of events and other club news. Sept. 21st EOA SIG: Aug. 23rd, Sept. 27th Astrophysics SIG: Aug. 20th, Sept. 17th President’s Message By Barbara Toy In case you haven’t picked up yet on the delicate hints that have been dropped here and there over the last few weeks, this month (August, the 27th and 28th, to be precise) is the month of our truly excellent AstroImage 2004 Conference.