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Resolved Astrometric Binary Stars Brian D. Mason
Resolved Astrometric Binary Stars Brian D. Mason 9/12/2012 U.S. Naval Observatory 1 Background Astrometric contributions of Friedrich Bessel (1784-1846) •Parallax of 61 Cygni (1838) U.S. Naval Observatory Background Astrometric contributions of Friedrich Bessel (1784-1846) •Parallax of 61 Cygni (1838) •Non-linear proper motion of Sirius and Procyon (1844) Image: http://vega.lpl.arizona.edu/sirius/A5.html U.S. Naval Observatory Background Astrometric contributions of Friedrich Bessel (1784-1846) •Parallax of 61 Cygni (1838) •Non-linear proper motion of Sirius and Procyon (1844) Due to stellar types (main- sequence and white dwarf) motion affect significant, but Image: http://vega.lpl.arizona.edu/sirius/A5.html companion hard to detect. • Sirius B first resolved in 1862 by Alvan Graham Clark (right) testing 18.5 ” Clark refractor. U.S. Naval Observatory Background Astrometric contributions of Friedrich Bessel (1784-1846) •Parallax of 61 Cygni (1838) •Non-linear proper motion of Sirius and Procyon (1844) Due to stellar types (main- sequence and white dwarf) motion affect significant, but companion hard to detect. • Sirius B first resolved in 1862 by Alvan Graham Clark (right) testing 18.5 ” Clark refractor. • Procyon B first resolved in 1896 by John Martin Schaeberle with Lick 36 ” Clark refractor. U.S. Naval Observatory CurrentCurrent Orbit: Orbit: Procyon Sirius AB AB • Broken line is line of nodes. • Green plus signs and asterisks: micrometry. • Pink asterisks: photography • Blue circles: HST/WFPC2 • Scales on axis are in arcseconds. • Direction of orbital motion at lower right. • Sirius Period = 50.090y. • Procyon Period = 40.82y. U.S. Naval Observatory Orbits • The 6 th Catalog of Orbits of Visual Binary Stars has 2298 orbits of 2187 systems. -
Rosseau, Brendan 2019 Astronomy Thesis Title
Rosseau, Brendan 2019 Astronomy Thesis Title: The Intellectual Marketplace: The Evolution of Space Exploration from Copernicus to von Braun & Beyond Advisor: Jay Pasachoff Advisor is Co-author: None of the above Second Advisor: Released: release now Authenticated User Access: Yes Contains Copyrighted Material: No The Intellectual Marketplace: The Evolution of Space Exploration from Copernicus to von Braun & Beyond by Brendan L. Rosseau Dr. Jay Pasachoff, Advisor A thesis submitted in partial fulfillment of the requirements for the Degree of Bachelor of Arts with Honors in Astronomy WILLIAMS COLLEGE Williamstown, Massachusetts May 8, 2019 TABLE OF CONTENTS Acknowledgments ……………………………………………………………………………………………….. 2 Abstract ………………………………………………………………………………………………………………. 3 Thesis Prologue ………………………………………………………………………………………... 4 Introduction …………………………………………………………………………………... 6 Part I: Early Astronomy ………………………………………………………………….. 11 Part II: Space Exploration in the New World ……………………………….….... 25 Part III: Spaceflight ………………………………………………………………………... 43 Looking Back & Looking Ahead ….………………………………………………….… 60 Appendix Endnotes ………………………………………………………………………………………. 64 About the Author …………………………………………………………………………… 68 Citations ……………………………………………………………………………………….. 69 1 ACKNOWLEDGMENTS I would like to express my great appreciation to Professor Jay Pasachoff, Field Memorial Professor of Astronomy at Williams College, for his invaluable contributions to this thesis and to my education in astronomy. I am particularly grateful for the assistance given by -
Department of Statistics, UCLA
UCLA Department of Statistics, UCLA Title Determination of the Accuracy of the Observations, by C. F. Gauss, Translation with preface Permalink https://escholarship.org/uc/item/4n21q6bx Author Ekström, Joakim Publication Date 2013-11-12 eScholarship.org Powered by the California Digital Library University of California Determination of the Accuracy of the Observations by Carl Friedrich Gauss. Translation by Joakim Ekström, with preface. Af«±§Zh±. Bestimmung der Genauigkeit der Beobachtungen is the second of the three major pieces that Gauss wrote on statistical hypothesis generation. It continues the methodological tradition of eoria Motus, producing estimates by maximizing probability density, however absence of the change-of- variables theorem causes technical diculties that compromise its elegance. In eoria Combinationis, Gauss abandoned the aforementioned method, hence placing Bestimmung der Genauigkeit at a cross- roads in the evolution of Gauss’s statistical hypothesis generation methodology. e present translation is paired with a preface discussing the piece and its historical context. Õ ó Translator’s Preface and Discussion by Joakim Ekström, UCLA Statistics Carl Friedrich Gauss (Õßßß-Õ¢¢) published three major pieces on statistical hypothesis generation: eoria Motus (ÕþÉ), Bestimmung der Genauigkeit (ÕÕä) and eoria Combinationis (ÕóÕ) (see Sheynin, ÕÉßÉ). eoria Motus was translated into English by C. H. Davis in Õ¢, eoria Combina- tionis was translated into English by G. W. Stewart in ÕÉÉ¢, but an English translation of Bestimmung der Genauigkeit has, in spite of great eorts, not been found in the literature. Hence the present translation. Bestimmung der Genauigkeit der Beobachtungen, as its complete title reads, is an interesting histor- ical text for many reasons. -
The Flint River Observer
who attended the first club meeting in 1997, only five are still in FRAC: co-founders Larry Higgins, THE Ken Walburn and Bill Warren, and charter members Steven “Saratoga Smitty” Smith and John Wallace. FLINT RIVER Two thing occurred to me recently. First, many of you have never met the men who started FRAC and kept it going when no one OBSERVER outside the club thought it would survive. To borrow from Sir Isaac Newton’s famous statement, NEWSLETTER OF THE FLINT Larry, Ken, Bill, Smitty and John are the giants RIVER ASTRONOMY CLUB upon whose shoulders FRAC stands today. The second thing that occurred to me was, I An Affiliate of the Astronomical League can’t recall ever seeing them together at one time. Well, all of them will be at the July club Vol. 20, No. 2 June, 2016 meeting. Our program will be “1997: FRAC’s Officers: President, Dwight Harness (1770 First Year,” with refreshments afterward. So mark th Hollonville Rd., Brooks, Ga. 30205, 770-227-9321, down Thursday, July 14 as a special day on your [email protected]); Vice President, Bill calendar and please try to attend. It will be a night Warren (1212 Everee Inn Rd., Griffin, Ga. 30224, to remember. [email protected]); Secretary, Carlos Flores; Treasurer, Truman Boyle. -Dwight Harness Board of Directors: Larry Higgins; Aaron Calhoun; and Jeremy Milligan. * * * Facebook Coordinator: Laura Harness; Alcor, Last Month’s Meeting/Activities. As anyone who Carlos Flores; Webmaster, Tom Moore; has been in FRAC for longer than 15 minutes Program Coordinator/Newsletter Editor, Bill knows, our observing mantra has always been, Do Warren; Observing Coordinators, Dwight the best you can with what you have. -
Februar 2019
Februar 2019 Vor 551 Jahren geboren JOHANNES WERNER (14.02.1468 – Mai 1522) Im Jahre 1472 wurde in Ingolstadt die erste Universität Bayerns durch Herzog LUDWIG IX von Bayern-Landshut ge- gründet. Nach der Kirchenspaltung ab 1530 entwickelte sich die Hochschule unter dem Einfluss des Jesuitenordens zu einem der Zentren der Gegenreformation. Kurfürst MAXI - MILIAN , der spätere bayerische König MAXIMILIAN I, ver- legte 1800 die Universität zunächst nach Landshut, dann nach München – seit 1802 trägt sie den heutigen Namen: LUDWIG -MAXIMILIAN s-Universität (LMU). 1484 schreibt sich der in Nürnberg geborene 16-jährige JOHANNES WERNER an der theologischen Fakultät der Ingolstädter Hochschule ein. Auch wenn es von Kind an sein Wunsch gewesen ist, Mathematiker zu werden, verfolgt er nun doch konsequent den Weg zum Priesterberuf: 1490 wird er als Kaplan in Herzogenaurach tätig, verbringt einige Jahre in Rom, wechselt 1498 an eine Pfarrei in Wöhrd bei Nürnberg, bis er schließlich Pfarrer der Johanniskirche in Nürnberg wird. Die Pflichten dieses Amtes nimmt er gewissenhaft bis zu seinem Tod wahr. Seine Zeit in Rom hatte WERNER bereits zu intensiven Studien der Mathematik und der Astronomie genutzt. Nach Nürnberg zurückgekehrt, vertieft er sich in eigene Forschungen. So beo- bachtet er im Jahr 1500 die Bewegung eines Kometen, führt Messungen mit selbstgebauten Instrumenten aus und dokumen- tiert alle Daten mit Sorgfalt. Mit großem Geschick baut er Astrolabien (Sternhöhen- messer) und Sonnenuhren, konstruiert einen besonderen Jakobsstab mit Winkeleinteilung. 1514 erscheint WERNER s Übersetzung der Geographia des CLAUDIUS PTOLEMÄUS (In Hoc Opere Haec Continentur Nova Translatio Primi Libri Geographicae Cl. Ptolomaei ). Zusätzlich zu umfangreichen Kommentaren entwickelt er eigene Ideen, die in Astronomie und Geografie angewandt werden können. -
Thinking Outside the Sphere Views of the Stars from Aristotle to Herschel Thinking Outside the Sphere
Thinking Outside the Sphere Views of the Stars from Aristotle to Herschel Thinking Outside the Sphere A Constellation of Rare Books from the History of Science Collection The exhibition was made possible by generous support from Mr. & Mrs. James B. Hebenstreit and Mrs. Lathrop M. Gates. CATALOG OF THE EXHIBITION Linda Hall Library Linda Hall Library of Science, Engineering and Technology Cynthia J. Rogers, Curator 5109 Cherry Street Kansas City MO 64110 1 Thinking Outside the Sphere is held in copyright by the Linda Hall Library, 2010, and any reproduction of text or images requires permission. The Linda Hall Library is an independently funded library devoted to science, engineering and technology which is used extensively by The exhibition opened at the Linda Hall Library April 22 and closed companies, academic institutions and individuals throughout the world. September 18, 2010. The Library was established by the wills of Herbert and Linda Hall and opened in 1946. It is located on a 14 acre arboretum in Kansas City, Missouri, the site of the former home of Herbert and Linda Hall. Sources of images on preliminary pages: Page 1, cover left: Peter Apian. Cosmographia, 1550. We invite you to visit the Library or our website at www.lindahlll.org. Page 1, right: Camille Flammarion. L'atmosphère météorologie populaire, 1888. Page 3, Table of contents: Leonhard Euler. Theoria motuum planetarum et cometarum, 1744. 2 Table of Contents Introduction Section1 The Ancient Universe Section2 The Enduring Earth-Centered System Section3 The Sun Takes -
Astrometry and Optics During the Past 2000 Years
1 Astrometry and optics during the past 2000 years Erik Høg Niels Bohr Institute, Copenhagen, Denmark 2011.05.03: Collection of reports from November 2008 ABSTRACT: The satellite missions Hipparcos and Gaia by the European Space Agency will together bring a decrease of astrometric errors by a factor 10000, four orders of magnitude, more than was achieved during the preceding 500 years. This modern development of astrometry was at first obtained by photoelectric astrometry. An experiment with this technique in 1925 led to the Hipparcos satellite mission in the years 1989-93 as described in the following reports Nos. 1 and 10. The report No. 11 is about the subsequent period of space astrometry with CCDs in a scanning satellite. This period began in 1992 with my proposal of a mission called Roemer, which led to the Gaia mission due for launch in 2013. My contributions to the history of astrometry and optics are based on 50 years of work in the field of astrometry but the reports cover spans of time within the past 2000 years, e.g., 400 years of astrometry, 650 years of optics, and the “miraculous” approval of the Hipparcos satellite mission during a few months of 1980. 2011.05.03: Collection of reports from November 2008. The following contains overview with summary and link to the reports Nos. 1-9 from 2008 and Nos. 10-13 from 2011. The reports are collected in two big file, see details on p.8. CONTENTS of Nos. 1-9 from 2008 No. Title Overview with links to all reports 2 1 Bengt Strömgren and modern astrometry: 5 Development of photoelectric astrometry including the Hipparcos mission 1A Bengt Strömgren and modern astrometry .. -
Rabbi Reuven Landau and the Jewish Reaction to Copernican Thought in Nineteenth Century Europe
JEREMY BROWN Rabbi Reuven Landau and the Jewish Reaction to Copernican Thought in Nineteenth Century Europe n the opening years of this century, Rabbi Shlomo Benizri, once Israel’s Minister of Labor and Social Affairs, published a comprehen- sive textbook on the Jewish calendar titled Ha-shamayim Mesapperim I 1 (The Heavens Proclaim). Most of R. Benizri’s work covers the complex mathematical and astronomical foundations which determine the struc- ture of the lunar based Jewish calendar, and the last part of the book describes the nature of the solar system. In this last section, R. Benizri concludes that despite nearly five hundred years of scientific and astro- nomical evidence to the contrary, it is the sun that revolves around the earth, not vice-versa. Although R. Benizri was educated in traditional Orthodox yeshivot and never attended university, his book made use of many modern scientific instruments and discoveries. It reproduced high resolution telescopic images of the surface of the planets (including those sent from the famous Viking 1 Project) and described the composition of the atmosphere and surface of the planets using data from NASA’s solar explorations. And yet, after a lengthy analysis, R. Benizri stated that the earth does not orbit the sun, because, in his account, the Bible, the rabbis of the Talmud and their medieval commentators had all concluded that the earth lay at the center of the universe. JEREMY BROWN, M.D., is Associate Professor and Director of Research in the Department of Emergency Medicine at the George Washington University in Washington, D.C. -