Groombridge at the Edge of the Charted Area of Hyperspace
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A Basic Requirement for Studying the Heavens Is Determining Where In
Abasic requirement for studying the heavens is determining where in the sky things are. To specify sky positions, astronomers have developed several coordinate systems. Each uses a coordinate grid projected on to the celestial sphere, in analogy to the geographic coordinate system used on the surface of the Earth. The coordinate systems differ only in their choice of the fundamental plane, which divides the sky into two equal hemispheres along a great circle (the fundamental plane of the geographic system is the Earth's equator) . Each coordinate system is named for its choice of fundamental plane. The equatorial coordinate system is probably the most widely used celestial coordinate system. It is also the one most closely related to the geographic coordinate system, because they use the same fun damental plane and the same poles. The projection of the Earth's equator onto the celestial sphere is called the celestial equator. Similarly, projecting the geographic poles on to the celest ial sphere defines the north and south celestial poles. However, there is an important difference between the equatorial and geographic coordinate systems: the geographic system is fixed to the Earth; it rotates as the Earth does . The equatorial system is fixed to the stars, so it appears to rotate across the sky with the stars, but of course it's really the Earth rotating under the fixed sky. The latitudinal (latitude-like) angle of the equatorial system is called declination (Dec for short) . It measures the angle of an object above or below the celestial equator. The longitud inal angle is called the right ascension (RA for short). -
ESO Annual Report 2004 ESO Annual Report 2004 Presented to the Council by the Director General Dr
ESO Annual Report 2004 ESO Annual Report 2004 presented to the Council by the Director General Dr. Catherine Cesarsky View of La Silla from the 3.6-m telescope. ESO is the foremost intergovernmental European Science and Technology organi- sation in the field of ground-based as- trophysics. It is supported by eleven coun- tries: Belgium, Denmark, France, Finland, Germany, Italy, the Netherlands, Portugal, Sweden, Switzerland and the United Kingdom. Created in 1962, ESO provides state-of- the-art research facilities to European astronomers and astrophysicists. In pur- suit of this task, ESO’s activities cover a wide spectrum including the design and construction of world-class ground-based observational facilities for the member- state scientists, large telescope projects, design of innovative scientific instruments, developing new and advanced techno- logies, furthering European co-operation and carrying out European educational programmes. ESO operates at three sites in the Ataca- ma desert region of Chile. The first site The VLT is a most unusual telescope, is at La Silla, a mountain 600 km north of based on the latest technology. It is not Santiago de Chile, at 2 400 m altitude. just one, but an array of 4 telescopes, It is equipped with several optical tele- each with a main mirror of 8.2-m diame- scopes with mirror diameters of up to ter. With one such telescope, images 3.6-metres. The 3.5-m New Technology of celestial objects as faint as magnitude Telescope (NTT) was the first in the 30 have been obtained in a one-hour ex- world to have a computer-controlled main posure. -
THE CONSTELLATION CIRCINUS, the COMPASS Circinus Is a Small
THE CONSTELLATION CIRCINUS, THE COMPASS Circinus is a small faint constellation in the southern sky, first defined in 1756 by French astronomer Nicolas Louis de Lacaille. Its name is Latin for compass, referring to the drafting tool used for drawing circles (it should not be confused with Pyxis, a constellation that represents a mariner's compass which points north). Its brightest star is Alpha Circini, with an apparent magnitude of 3.19. Slightly variable, it is the brightest rapidly oscillating Ap star in the night sky(peculiar stars showing an abundances of some metals. AX Circini is a Cepheid variable visible with the unaided eye, and BX Circini is a faint star thought to have been formed from the merger of two white dwarfs. Two sun-like stars have planetary systems: HD 134060 has two small planets, and HD 129445 has a Jupiter-like planet. Supernova SN 185 appeared in Circinus in 185 AD and was recorded by Chinese observers. Two novae have been observed more recently, in the 20th century.The Milky Way runs through the constellation, featuring prominent objects such as the open cluster NGC 5823 and the planetary nebula NGC 5315. Circinus hosts one notable spiral galaxy, the Circinus Galaxy, which was discovered in 1977 and is the closest Seyfert galaxy to the Milky Way. Seyfert galaxies are named after Carl Seyfert (1911 - 1960), an American astronomer who The Circinus Galaxy, a first described this class in 1943, and Type II Seyfert galaxy are intensely studied objects in astronomy. They are thought to be powered by the same phenomena that occur in quasars, but unlike quasars, their host galaxies are clearly detectable. -
Space Photometry with BRITE-Constellation §
universe Review Space Photometry with BRITE-Constellation § Werner W. Weiss 1,* , Konstanze Zwintz 2 , Rainer Kuschnig 3 , Gerald Handler 4 , Anthony F. J. Moffat 5 , Dietrich Baade 6 , Dominic M. Bowman 7 , Thomas Granzer 8 , Thomas Kallinger 1 , Otto F. Koudelka 3, Catherine C. Lovekin 9 , Coralie Neiner 10 , Herbert Pablo 11 , Andrzej Pigulski 12 , Adam Popowicz 13 , Tahina Ramiaramanantsoa 14 , Slavek M. Rucinski 15 , Klaus G. Strassmeier 8 and Gregg A. Wade 16 1 Institute for Astrophysics, University of Vienna, A-1180 Vienna, Austria; [email protected] 2 Institute for Astro- and Particle Physics, University of Innsbruck, A-6020 Innsbruck, Austria; [email protected] 3 Institut für Kommunikationsnetze und Satellitenkommunikation, Technische Universität Graz, A-8020 Graz, Austria; [email protected] (R.K.); [email protected] (O.F.K.) 4 Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences, 00-716 Warsaw, Poland; [email protected] 5 Department of Physics, University of Montreal, Montreal, QC H3C 3J7, Canada; [email protected] 6 European Southern Observatory (ESO), D-85748 Garching bei München, Germany; [email protected] 7 Institute of Astronomy, KU Leuven, B-3001 Leuven, Belgium; [email protected] 8 Department Cosmic Magnetic Fields, Leibniz Institut fuer Astrophysik Potsdam, D-14482 Potsdam, Germany; [email protected] (T.G.); [email protected] (K.G.S.) 9 Physics Department, Mount Allison University, Sackville, NB E4L 1E6, Canada; [email protected] 10 LESIA, Paris Observatory, PSL University, -
Science Cases for a Visible Interferometer
March 22, 2017 0:30 World Scientific Book - 9.75in x 6.5in Science_cases_visible page i September, 29 2015 Science cases for a visible interferometer arXiv:1703.02395v3 [astro-ph.SR] 21 Mar 2017 Publishers' page i March 22, 2017 0:30 World Scientific Book - 9.75in x 6.5in Science_cases_visible page ii Publishers' page ii March 22, 2017 0:30 World Scientific Book - 9.75in x 6.5in Science_cases_visible page iii Publishers' page iii March 22, 2017 0:30 World Scientific Book - 9.75in x 6.5in Science_cases_visible page iv Publishers' page iv March 22, 2017 0:30 World Scientific Book - 9.75in x 6.5in Science_cases_visible page v This book is dedicated to the memory of our colleague Olivier Chesneau who passed away at the age of 41. v March 22, 2017 0:30 World Scientific Book - 9.75in x 6.5in Science_cases_visible page vi vi Science cases for a visible interferometer March 22, 2017 0:30 World Scientific Book - 9.75in x 6.5in Science_cases_visible page vii Preface High spatial resolution is the key for the understanding of various astrophysical phenomena. But even with the future E-ELT, single dish instrument are limited to a spatial resolution of about 4 mas in the visible whereas, for the closest objects within our Galaxy, most of the stellar photosphere remain smaller than 1 mas. Part of these limitations was the success of long baseline interferometry with the AMBER (Petrov et al., 2007) instrument on the VLTI, operating in the near infrared (K band) of the MIDI instrument (Leinert et al., 2003) in the thermal infrared (N band). -
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. -
Night Skies of Aboriginal Australia a Noctuary
Night Skies of Aboriginal Australia A Noctuary Dianne Johnson Originally published in 1998 by Oceania Publications Tis reprint edition published in 2014 by SYDNEY UNIVERSITY PRESS © Sydney University Press 2014 Reproduction and Communication for other purposes Except as permitted under the Act, no part of this edition may be reproduced, stored in a retrieval system, or communicated in any form or by any means without prior written permission. All requests for reproduction or communication should be made to Sydney University Press at the address below: Sydney University Press Fisher Library F03 University of Sydney NSW 2006 AUSTRALIA Email: [email protected] National Library of Australia Cataloguing-in-Publication entry Author: Johnson, Dianne D. (Dianne Dorothy), author. Title: Night skies of Aboriginal Australia : a noctuary / Dianne Johnson. Edition: Reprint edition. ISBN: 9781743323878 (paperback) Subjects: Astronomy, Aboriginal Australian. Aboriginal Australians--Folklore. Dewey Number: 520.994 Cover image Tis 40 x 60cm painting is by Mick Namerari Tjapaltjarri, a Pintupi man born c.1925. Painted in 1978, it depicts the rising sun on the right hand side, with the daylight behind it, chasing away the black night on the lef. Te central circles are labelled a ‘special place’ and the white dots are painted stones, although they could also be seen as stars or campfres. © Te estate of the artist licensed by Aboriginal Artists Agency Ltd. Contents List of Figures v Note to the 2014 Edition ix Acknowledgements 1 Preface 3 1. Prologue 5 2. Aboriginal Cosmology 21 3. Natural Cycles and the Stars 39 4. Mythology 69 5. Social Relations and Kin Ties 103 6. -
Observer's Handbook 1982
OBSERVER’S HANDBOOK 1982 EDITOR: ROY L. BISHOP ROYAL ASTRONOMICAL SOCIETY OF CANADA CONTRIBUTORS AND ADVISORS A l a n H. B a t t e n , Dominion Astrophysical Observatory, Victoria, B .C ., Canada V8X 3X3 (The Nearest Stars). R o y L. B is h o p , Department of Physics, Acadia University, Wolfville, N.S., Canada B0P 1X0 (Editor). Terence Dickinson, R.R. 3, Odessa, Ont., Canada, K0H 2H0, (The Planets). D a v id W. D u n h a m , International Occultation Timing Association, P.O. Box 7488, Silver Spring, Md. 20907, U .S.A . (Planetary Appulses and Occultations). A la n D y e r , Queen Elizabeth Planetarium, 10004-104 Ave., Edmonton, Alta. T5J 0K1 (Messier Catalogue, Deep-Sky Objects). M arie Fidler, Royal Astronomical Society of Canada, 124 Merton St., Toronto, Ont., Canada M4S 2Z2 (Observatories and Planetaria). Victor Gaizauskas, Herzberg Institute of Astrophysics, National Research Council, Ottawa, Ont., Canada K1A 0R6 (Sunspots). J o h n A. G a l t , Dominion Radio Astrophysical Observatory, Penticton, B.C., Canada V2A 6K3 (Radio Sources). Ian H alliday, Herzberg Institute of Astrophysics, National Research Council, Ottawa, Ont., Canada K1A 0R6 (Miscellaneous Astronomical Data). H e l e n S. H o g g , David Dunlap Observatory, University of Toronto, Richmond Hill, Ont., Canada LAC 4Y6 (Foreword). D o n a l d A. M a c R a e , David Dunlap Observatory, University of Toronto, Richmond Hill, Ont., Canada L4C 4Y6 (The Brightest Stars). B r i a n G. M a r s d e n , Smithsonian Astrophysical Observatory, Cambridge, Mass., U.S.A. -
Journal of Double Star Observations V5
Vol. 17 No. 1 January 1, 2021 Journal of Double Star Observations Page 27 Double Star Measurements at the Southern Sky with a 50 cm Reflector in 2019 Rainer Anton Altenholz/Kiel, Germany rainer.anton”at”ki.comcity.de Abstract: Recordings of 82 double and multiple systems, in total 92 pairs, were made with a fast CMOS camera attached to a 50 cm reflector, and were analyzed with “lucky imag- ing”. The scale was calibrated with reference systems, which were selected for the amount and precision of literature data, including from Gaia, so as to obtain trustworthy extrapolations to the epoch of own measurements. In particular, a number of binaries was found to fulfill this criterion, while other pairs exhibited more or less significant deviations from hitherto assumed orbits. A number of interesting systems are discussed in some detail, and a few images are also presented. Introduction measurements [4]), by data from Gaia DR2, and by the The telescope is of Ritchey-Chrétien type, and is recently revised ephemeris [Izm, 5]. Fourteen more maintained at the “Internationale Amateursternwarte” binaries were found, with separations between one and in Namibia, where I have already used it repeatedly in ten arcsec, with similarly trustworthy data, including the past [3]. The primary focal length of 4.1 m was from Gaia, so as to serve as reference. In two cases, extended by a 2x Barlow lens, resulting in an f-ratio of alpha Cen and gamma Vir, stars are too bright for about f/12. For any pair, series of up to 2000 images Gaia, but their orbits are well-known. -
Publications for Timothy Bedding 2021 2020 2019
Publications for Timothy Bedding 2021 B., Hogg, D. (2020). Forward Modeling the Orbits of Yu, J., Hekker, S., Bedding, T., Stello, D., Huber, D., Gizon, L., Companions to Pulsating Stars from Their Light Travel Time Khanna, S., Bi, S. (2021). Asteroseismology of luminous red Variations. Astronomical Journal, 159(5), 202. <a giants with Kepler - II. Dependence of mass-loss on pulsations href="http://dx.doi.org/10.3847/1538-3881/ab7d38">[More and radiation. Monthly Notices of the Royal Astronomical Information]</a> Society, 501(4), 5135-5148. <a Li, G., Van Reeth, T., Bedding, T., Murphy, S., Antoci, V., href="http://dx.doi.org/10.1093/mnras/staa3970">[More Ouazzani, R., Barbara, N. (2020). Gravity-mode period Information]</a> spacings and near-core rotation rates of 611 ? Doradus stars Murphy, S., Barbara, N., Hey, D., Bedding, T., Fulcher, B. with Kepler. Monthly Notices of the Royal Astronomical (2021). Finding binaries from phase modulation of pulsating Society, 491(3), 3586-3605. <a stars with Kepler �VI. Orbits for 10 new binaries with href="http://dx.doi.org/10.1093/mnras/stz2906">[More mischaracterized primaries. Monthly Notices of the Royal Information]</a> Astronomical Society, 493(4), 5382-5388. <a Mart�nez, R., Gaudi, B., Rodriguez, J., Zhou, G., Labadie- href="http://dx.doi.org/10.1093/mnras/staa562">[More Bartz, J., Quinn, S., Penev, K., Tan, T., Latham, D., Paredes, L., Information]</a> Bedding, T., et al (2020). KELT-25 b and KELT-26 b: A Hot Li, Y., Bedding, T., Stello, D., Sharma, S., Huber, D., Murphy, Jupiter and a Substellar Companion Transiting Young A Stars S. -
Double Star Measurements at the Southern Sky with a 50 Cm Reflector and a Fast CCD Camera in 2014
Vol. 11 No. 2 April 1, 2015 Journal of Double Star Observations Page 81 Double Star Measurements at the Southern Sky with a 50 cm Reflector and a Fast CCD Camera in 2014 Rainer Anton Altenholz/Kiel, Germany e-mail: rainer.anton”at”ki.comcity.de Abstract: A Ritchey-Chrétien reflector with 50 cm aperture was used in Namibia for record- ings of double stars with a fast CCD camera and a notebook computer. From superposition of “lucky images”, measurements of 91 pairings in 79 double and multiple systems were ob- tained and compared with literature data. Occasional deviations are discussed. Some images of noteworthy systems are also presented. act scaling factor was obtained with calibration stars Introduction (see Table 1 and discussion below). As in earlier work, the technique of “lucky imag- Recordings were made with red or near-infrared ing” was applied to reduce seeing effects in recordings filters to reduce seeing effects and the atmospheric of double star images by using short exposure times. spectrum, and especially when using the Barlow lens, With only the best frames being registered and stacked, to reduce chromatic aberration. Exposure times were the resolution can approach the theoretical limit of the varied between 0.1 msec and 350 msec, depending on telescope, and the accuracy of position measurements the brightness and on the seeing conditions. The best can even be better than this by about one order of mag- frames, typically several tens up to more than one hun- nitude. More details of the technique are, for example, dred, were later selected and stacked, as described earli- described in reference [1]. -
Eternal Doctrine (PDF)
Eternal Doctrine Groombridge Log Eternal Doctrine Tommi Salminen Based on the universe of By Fred Ford and Paul Reiche III © Tommi Salminen 2017 This book contains quotes from the computer game Star Control 2 which was made by Fred Ford and Paul Reiche in 1992. The book is printed with their permission. Star Control is a registered trademark of Stardock Corporation. Publisher: BoD – Books on Demand, Helsinki, Finland Printed by: BoD – Books on Demand, Norderstedt, Germany ISBN 978-951-568-394-6 CHAPTERS Gathering Thoughts ...................................................... 9 The Process ................................................................. 23 Ultimate Retreat .......................................................... 35 Galactic Garbage Dumps ............................................ 48 Pitch Black .................................................................. 63 The Descent ................................................................ 77 Counsel ....................................................................... 89 Two Doctrines .......................................................... 101 Violent Rhinos .......................................................... 116 Interrogation ............................................................. 130 Ancient Evil .............................................................. 142 Time Jokes ................................................................ 151 Four Butterflies ......................................................... 168 Very Ugly Xenoforms .............................................