DOCSLIB.ORG

Our Local Cosmic

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Our Local Cosmic LOST IN THE GLARE: DIY: `OUMUAMUA: 24 Lesser-Known Targets Light Barriers The “Comet” from Another Star PAGE 58 PAGE 72 PAGE 20 THE ESSENTIAL GUIDE TO ASTRONOMY On the Edge of the Abyss: Our Local Cosmic PAGE 12 OCTOBER 2018 The Great Melbourne Rambling Through Telescope Restoration Autumn Skies skyandtelescope.com PAGE 34 PAGE 28 DeLiteTM Your Eyes, DeLiteTM Your Wallet! All the Tele Vue Technology, Performance, and Quality You Expect at a Price You Won’t: The 62° Dellechiaie-Designed DeLite Series. The heart of any Tele Vue eyepiece is full-field image fidelity born of superb sharpness and contrast, and produced using the finest methods and materials. The 62° DeLite eyepiece series, available in 18.2mm, 15mm, 13mm, 11mm, 9mm, 7mm, 5mm, 4mm and 3mm parfocal focal lengths, adds 20mm eye relief, adjustable-height eyeguard, and compact size to the performance mix, making them wonderfully comfortable for bino-viewing, perfect with Fonemate and for night vision, plus great per- formers in all types of scopes, on all types of objects. Call Tele Vue for recommendations or visit TeleVue.com. Excerpt from “Tele Vue’s New DeLite Eyepieces” S&T (Sept. 2015 p:64,65 — di Cicco, Dennis.) ฀ The DeLites offered superb views. Stars appeared as pinpoints across the entire field; there wasn’t a hint of false color...The DeLites are very easy to look through. You never get the feeling that you are struggling to get your eye perfectly aligned with the eyepiece. This comes as little surprise since Tele Vue acknowledges that the DeLite design evolved as a “smaller, more economical and lightweight version of the Delos.” Excerpt from “We Test Tele Vue’s DeLite Eyepieces” Astronomy (Mar. 2016 p:64,65 — Trusock, Tom.) ฀ Tele Vue has once again created a line of all-around excellent eyepieces, good for both planetary and deep- sky work. Selling points are long eye relief, a small and light design, and the relatively inexpensive cost. T e D linne hhoulld bee onon y ur mu t iew-t ro gh l t eye eeec s a t e eex s ar par . ® Tele Vue 32 Elkay Dr., Chester, New York 10918 (845) 469-4551. televue.com Visionary Star Adventurer Astro package The only thing nicer than being able to easily take a dramatic nightscape photo, is Star Adventurer saving money on the equipment that makes it possible. From Photo package September 1st through the 30th, you can save up to $60 on award-winning Star Adventurers and accessories. The Sky-Watcher USA Star Adventurer multi-purpose mount is perfect for anyone — Milky Way photographers, eclipse chasers and budding astrophotographers. It’s the ideal night-and-day, grab-and-go package. Compact and portable — weighing only 2.5 pounds — this versatile mount is also powerful. Its quality construction, utilizing precision all-metal gearing, delivers an ge of that if I were you. impressive 11-pound payload capacity. ithout notice. 20-18014. The Star Adventurer Mini (SAM) takes everything that makes our standard Star Adventurer so popular and delivers it in a more compact package. Equally easy to use, SAM features a built-in WiFi interface using our free Star Adventurer SAM Console app for iOS and Android. Mini (SAM) So if taking stunning nightscape images without all of the hassle is for you, act before September 30th to do something even better: save money! ©2018 Sky-Watcher USA. Specifications and pricing subject to change w This is the first time the Star Adventurers have been on sale. I’d take advanta Optional accessories Star Adventurer Astro Pack . Regularly $329 ......Sale Price $269 ......SAVE $60 Ball head adapter Star Adventurer Photo Pack Regularly $319 ......Sale Price $259 ......SAVE $60 Star Adventurer Mini ..........Regularly $299 ......Sale Price $249 ......SAVE $50 Latitude Base .....................Regularly $65 ........Sale Price $55 ........ SAVE $10 DecLbracket Counterweight Kit .............. Regularly $30 ........Sale Price $25 ..........SAVE $5 Latitude base Counterweight kit Ball Head Adapter ............. Regularly $10 ........Sale Price $5 ............ SAVE $5 Dec L Bracket..................... Regularly $40 ........Sale Price $35 .......... SAVE $5 Photographer: Carlos Guana Camera: Canon 5D IV Lens: Rokinon 14mm 2.8 Mount: Star Adventurer For information on all of our products and services, or to find an authorized Sky-Watcher USA dealer near you, just visit www.skywatcherusa.com. Don’t forget to follow us on Facebook, Twitter and Instagram! CONTENTS October 2018 VOL. 136, NO. 4 THE ESSENTIAL GUIDE TO ASTRONOMY FEATURES Cover Story: 12 The Void Next Door An enormous region of near- emptiness starts on our doorstep, giving astronomers their best chance to probe one of these gigantic cosmic structures. By Ken Croswell 58 20 `Oumuamua’s Dramatic Visit The space rock from beyond the OBSERVING S&T TEST REPORT solar system has left us amazed and 41 October’s Sky at a Glance 66 Meade’s 70-mm Astrograph perplexed. By Greg Laughlin Alan Dyer 42 Lunar Almanac & Sky Chart COLUMNS / DEPARTMENTS 28 A Tourist’s Guide to the 43 Binocular Highlight Autumn Highlights By Mathew Wedel 4 Spectrum Ramble through the skies of fall and By Peter Tyson check in on some favorite targets. 44 Planetary Almanac 6 From Our Readers By Jerry Oltion 45 Under the Stars By Fred Schaaf 7 75, 50 & 25 Years Ago 34 New Life for the Great By Roger W. Sinnott Melbourne Telescope 46 Sun, Moon & Planets Australian groups are restoring what By Fred Schaaf 8 News Notes was once the world’s largest 48 Celestial Calendar 57 Book Review equatorially mounted telescope. By S. N. Johnson-Roehr By Monica Young By Trudy E. Bell 52 Exploring the Moon 70 New Product Showcase 58 Lost in the Glare By Charles A. Wood 72 Astronomer’s Workbench Some interesting objects await 54 Deep-Sky Wonders By Jerry Oltion imagers who can tear their cameras By Sue French away from the showpieces of the 74 Gallery night skies. By Ron Brecher 84 Focal Point Find us on Facebook & Twitter By Roger Sargent BRECHER RON ON THE COVER ONLINE SKY AT A GLANCE ASTROPHOTO GALLERY ONLINE MARKETPLACE Our popular column highlights celes- Enjoy readers’ best images and Browse personal used equipment tial delights for the upcoming week. upload your own to share with your and dark-sky lodgings and sell your Also available as an app — with sky fellow enthusiasts. Be sure to check own without paying a fee. charts included! out the Editor’s Choice picks. skyandtelescope.com/ skyandtelescope.com/ataglance skyandtelescope.com/gallery marketplace Matter’s l ow outlines SKY & TELESCOPE (ISSN 0037-6604) is published monthly by Sky & Telescope, a division of F+W Media, Inc., 90 Sherman St., Cambridge, MA 02140-3264, USA. Phone: 800-253- several voids in our 0245 (customer service/subscriptions), 888-253-0230 (product orders), 617-864-7360 (all other calls). Fax: 617-864-6117. Website: skyandtelescope.com. ©2018 F+W Media, Inc. cosmic neighborhood. All rights reserved. Periodicals postage paid at Boston, Massachusetts, and at additional mailing offi ces. Canada Post Publications Mail sales agreement #40029823. Canadian return JOHAN HIDDING / UNIV. OF address: 2744 Edna St., Windsor, ON, Canada N8Y 1V2. Canadian GST Reg. #R128921855. POSTMASTER: Send address changes to Sky & Telescope, PO Box 420235, Palm Coast, FL GRONINGEN / KAPTEYN INST. 32142-0235. Printed in the USA. 2 OCTOBER 2018 • SKY & TELESCOPE % Now only $49.90 free shipping! % YOUR TRIP THROUGH THE UNIVERSE! 2017 Universe2go combines the view of the real night sky with the digital world. Look to the sky and discover constellations, planets, and galaxies. universe2go.com WHAT IS UNIVERSE2GO? Universe2go is an augmented-reality star viewer and smartphone app, which shows you the starry night sky in stunning detail! Place your smartphone in the viewer and observe the night sky with numerous, additional bits of information as well as sensational close-ups of various celestial bodies. Images of all 88 Close-ups of planets, More than three hours of Narratives of Greek Enjoyable exploration in constellations of the galaxies, star clusters and audio explanations mythology quiz mode heavens nebulae THE PRESS SAYS ERISEA-MAG.COM: SCIENTIFIC AMERICAN: ASTRONOMY NOW: “A unique and quite frankly “Doing augmented reality “For those at all levels of brilliant thing to have to this way is great, doing experience in astronomy, it hand for anyone who has a personal planetarium- is definitely the next leap in a keen interest in space, come-star-map this way is the evolution of interactive especially children as it is so inspired.” sky map devices.” easy to use.” Incl. Universe2go app unlock code. Now only $9.90 reduced from $99. www.universe2go.com Free shipping! Find more Omegon products at www.omegon.com! SPECTRUM by Peter Tyson The Big Empty The Essential Guide to Astronomy Founded in 1941 by Charles A. Federer, Jr. YOU MIGHT ASK WHY we would do a cover story on cosmic voids — and Helen Spence Federer thosestupendouslyvast,largelygalaxy-freeSaharasofspace.After EDITORIAL all, astronomy is all about observing things, not nothings, right? Editor in Chief Peter Tyson Even if you wanted to look there, as a zealous coterie of professional Senior Editors J. Kelly Beatty, Alan M. MacRobert astronomers does, it’s not a walk in the park. As one of these folks Science Editor Camille M. Carlisle wrylynotesinourarticleonpage12,“Observingemptyspaceisveryhard.” News Editor Monica Young Associate Editors S. N. Johnson-Roehr, Sean Walker Well, it turns out that cosmic voids play a key role in shaping the large-scale Observing Editor Diana Hannikainen structureoftheuniverse.Asgravitydrawsgalaxiestogether,soitluresthem Project Coordinator Bud Sadler away from voids. Take the example of our Local Void, as it’s prosaically known. Digital Content Strategist Janine Myszka This fantastically empty zone steepens the gravitational “hill” that our Milky Senior Contributing Editors WayGalaxyslidesdownatadizzying630km/s(1.4millionmph).
Load more

Recommended publications
  • Astronomie in Theorie Und Praxis 8. Auflage in Zwei Bänden Erik Wischnewski
    Astronomie in Theorie und Praxis 8. Auflage in zwei Bänden Erik Wischnewski Inhaltsverzeichnis 1 Beobachtungen mit bloßem Auge 37 Motivation 37 Hilfsmittel 38 Drehbare Sternkarte Bücher und Atlanten Kataloge Planetariumssoftware Elektronischer Almanach Sternkarten 39 2 Atmosphäre der Erde 49 Aufbau 49 Atmosphärische Fenster 51 Warum der Himmel blau ist? 52 Extinktion 52 Extinktionsgleichung Photometrie Refraktion 55 Szintillationsrauschen 56 Angaben zur Beobachtung 57 Durchsicht Himmelshelligkeit Luftunruhe Beispiel einer Notiz Taupunkt 59 Solar-terrestrische Beziehungen 60 Klassifizierung der Flares Korrelation zur Fleckenrelativzahl Luftleuchten 62 Polarlichter 63 Nachtleuchtende Wolken 64 Haloerscheinungen 67 Formen Häufigkeit Beobachtung Photographie Grüner Strahl 69 Zodiakallicht 71 Dämmerung 72 Definition Purpurlicht Gegendämmerung Venusgürtel Erdschattenbogen 3 Optische Teleskope 75 Fernrohrtypen 76 Refraktoren Reflektoren Fokus Optische Fehler 82 Farbfehler Kugelgestaltsfehler Bildfeldwölbung Koma Astigmatismus Verzeichnung Bildverzerrungen Helligkeitsinhomogenität Objektive 86 Linsenobjektive Spiegelobjektive Vergütung Optische Qualitätsprüfung RC-Wert RGB-Chromasietest Okulare 97 Zusatzoptiken 100 Barlow-Linse Shapley-Linse Flattener Spezialokulare Spektroskopie Herschel-Prisma Fabry-Pérot-Interferometer Vergrößerung 103 Welche Vergrößerung ist die Beste? Blickfeld 105 Lichtstärke 106 Kontrast Dämmerungszahl Auflösungsvermögen 108 Strehl-Zahl Luftunruhe (Seeing) 112 Tubusseeing Kuppelseeing Gebäudeseeing Montierungen 113 Nachführfehler
    [Show full text]
  • Download the Far Horizon
    The Far Horizon by Lucas Malet The Far Horizon by Lucas Malet E-text prepared by Suzanne Shell, Danny Wool, Lorna Hanrahan, Mary Musser, Charles Franks, and the Online Distributed Proofreading Team THE FAR HORIZON BY LUCAS MALET (MRS. MARY ST. LEGER HARRISON) BY THE SAME AUTHOR _The Wages of Sin_ _A Counsel of Perfection_ page 1 / 464 _Colonel Enderby's Wife_ _Little Peter_ _The Carissima_ _The Gateless Barrier_ _The History of Sir Richard Calmady_ "Ask for the Old Paths, where is the Good Way, and walk therein, and ye shall find rest."--JEREMIAS. "The good man is the bad man's teacher; the bad man is the material upon which the good man works. If the one does not value his teacher, if the other does not love his material, then despite their sagacity they must go far astray. This is a mystery of great import."--FROM THE SAYINGS OF LAO-TZU. ..."Cherchons a voir les choses comme elles sont, et ne voulons pas avoir plus d'esprit que le bon Dieu! Autrefois on croyait que la canne a sucre seule donnait le sucre, on en tire a peu pres de tout maintenant. Il est de meme de la poesie. Extrayons-la de n'importe quoi, car elle git en page 2 / 464 tout et partout. Pas un atome de matiere qui ne contienne pas la poesie. Et habituons-nous a considerer le monde comme un oeuvre d'art, dont il faut reproduire les procedees dans nos oeuvres."--GUSTAVE FLAUBERT. CHAPTER I Dominic Iglesias stood watching while the lingering June twilight darkened into night.
    [Show full text]
  • Thomé H. Fang, Tang Junyi and the Appropriation of Huayan Thought
    Thomé H. Fang, Tang Junyi and the Appropriation of Huayan Thought A thesis submitted to the University of Manchester for the degree of Doctor of Philosophy in the Faculty of Humanities 2014 King Pong Chiu School of Arts, Languages and Cultures TABLE OF CONTENTS Table of Contents 2 List of Figures and Tables 4 List of Abbreviations 5 Abstract 7 Declaration and Copyright Statement 8 A Note on Transliteration 9 Acknowledgements 10 Chapter 1 - Research Questions, Methodology and Literature Review 11 1.1 Research Questions 11 1.2 Methodology 15 1.3 Literature Review 23 1.3.1 Historical Context 23 1.3.2 Thomé H. Fang and Huayan Thought 29 1.3.3 Tang Junyi and Huayan Thought 31 Chapter 2 – The Historical Context of Modern Confucian Thinkers’ Appropriations of Buddhist Ideas 33 2.1 ‘Ti ’ and ‘Yong ’ as a Theoretical Framework 33 2.2 Western Challenge and Chinese Response - An Overview 35 2.2.1 Declining Status of Confucianism since the Mid-Nineteenth Century 38 2.2.2 ‘Scientism’ as a Western Challenge in Early Twentieth Century China 44 2.2.3 Searching New Sources for Cultural Transformation as Chinese Response 49 2.3 Confucian Thinkers’ Appropriations of Buddhist Thought - An Overview 53 2.4 Classical Huayan Thought and its Modern Development 62 2.4.1 Brief History of the Huayan School in the Tang Dynasty 62 2.4.2 Foundation of Huayan Thought 65 2.4.3 Key Concepts of Huayan Thought 70 2.4.4 Modern Development of the Huayan School 82 2.5 Fang and Tang as Models of ‘Chinese Hermeneutics’- Preliminary Discussion 83 Chapter 3 - Thomé H.
    [Show full text]
  • X********X************************************************** * Reproductions Supplied by EDRS Are the Best That Can Be Made * from the Original Document
    DOCUMENT RESUME ED 302 264 IR 052 601 AUTHOR Buckingham, Betty Jo, Ed. TITLE Iowa and Some Iowans. A Bibliography for Schools and Libraries. Third Edition. INSTITUTION Iowa State Dept. of Education, Des Moines. PUB DATE 88 NOTE 312p.; Fcr a supplement to the second edition, see ED 227 842. PUB TYPE Reference Materials Bibliographies (131) EDRS PRICE MF01/PC13 Plus Postage. DESCRIPTORS Annotated Bibllographies; *Authors; Books; Directories; Elementary Secondary Education; Fiction; History Instruction; Learning Resources Centers; *Local Color Writing; *Local History; Media Specialists; Nonfiction; School Libraries; *State History; United States History; United States Literature IDENTIFIERS *Iowa ABSTRACT Prepared primarily by the Iowa State Department of Education, this annotated bibliography of materials by Iowans or about Iowans is a revised tAird edition of the original 1969 publication. It both combines and expands the scope of the two major sections of previous editions, i.e., Iowan listory and literature, and out-of-print materials are included if judged to be of sufficient interest. Nonfiction materials are listed by Dewey subject classification and fiction in alphabetical order by author/artist. Biographies and autobiographies are entered under the subject of the work or in the 920s. Each entry includes the author(s), title, bibliographic information, interest and reading levels, cataloging information, and an annotation. Author, title, and subject indexes are provided, as well as a list of the people indicated in the bibliography who were born or have resided in Iowa or who were or are considered to be Iowan authors, musicians, artists, or other Iowan creators. Directories of periodicals and annuals, selected sources of Iowa government documents of general interest, and publishers and producers are also provided.
    [Show full text]
  • The Arid Soils of the Balikh Basin (Syria)
    THE ARID SOILS OF THE BALIKH BASIN (SYRIA) M.A. MULDERS ERRATA THE ARID SOILS OF THE BALIKH BASIN (SYRIA). M.A. MULDERS, 1969 page 21, line 2 from bottom: read: 1, 4 instead of: 14 page 81, line 1 from top: read: x instead of: x % K page 103t Fig» 19: read: phytoliths instead of: pytoliths page 121, profile 51, 40-100 cm: read: clay instead of: silty clay page 125, profile 26, 40-115 cm: read: silt loam instead of: clay loam page 127, profile 38, 105-150 cm: read: clay instead of: silty loam page 127, profile 42, 14-40 cm: read: silty clay loam instead of: silt loam page 127, profile 42, 4O-6O cm: read: silt loam instead of: clay loam page 138, 16IV, texture: read: 81,5# sand, 14,4% silt instead of: 14,42! sand, 81.3% silt page 163, add: A and P values (quantimet), magnification of thin sections 105x THE ARID SOILS OF THE BALIKH BASIN (SYEIA). M.A. MULDERS, 19Ô9 page 18, Table 2: read: mm instead of: min page 80, Fig. 16: read: kaolinite instead of: kaolite page 84, Table 21 : read: Kaolinite instead of: Kaolonite page 99, line 17 from top: read: at instead of: a page 106, line 20 from bottom: read: moist instead of: most page 109t line 8 from bottom: read: recognizable instead of: recognisable page 115» Fig. 20, legend: oblique lines : topsoil, 0 - 30 cm horizontal lines : deeper subsoil, 60 - 100 cm page 159» line 6 from top: read: are instead of: is 5Y THE ARID SOILS OF THE BAUKH BASIN (SYRIA) 37? THE ARID SOILS OF THE BALIKH BASIN (SYRIA) PROEFSCHRIFT TER VERKRIJGING VAN DE GRAAD VAN DOCTOR IN DE WISKUNDE EN NATUURWETENSCHAPPEN AAN DE RIJKS- UNIVERSITEIT TE UTRECHT, OP GEZAG VAN DE RECTOR MAGNIFICUS, PROF.DR.
    [Show full text]
  • Next TCC Club Meeting Friday March 30 7:00 PM Dr. William Caire – Director of the Selman Living Laboratory and Observatory
    Next TCC Club Meeting Friday March 30 7:00 PM Dr. William Caire – Director of the Selman Living Laboratory and Observatory Contents Presidents Message Messier Marathon March 30 Meeting One Armed Observing with a Sling Coming Events Regional Summer Astronomy Events Spring Planets March 2 Minutes Dark Sky Committee Update Treasurers report President’s Message by Ann Bruun This spring the Astronomy Club of Tulsa has been awarded a volunteer grant from Scripps Howard Foundation. The money will be used to purchase a projector and a laptop computer. With this equipment we will be able to give presentations at the observatory during public star parties and anywhere we are hosting a group interested in Astronomy. Our outreach will definitely be enhanced by this grant. The Messier Marathon is March 24 th , next Saturday, at TUVA. Be sure and read the article describing the marathon below and remember you do not have to stay all night. My first year I only made it until about 1:00 AM. You can also bring a cot to set up in the clubhouse and get some sleep. The marathon is definitely a challenge but the camaraderie is what really makes it worthwhile. Open Positions: We have two open positions I would like everyone to consider. The Group Director and the Newsletter Editor. Teresa and Jerry have each done a fantastic job in these positions respectively but unfortunately paid work has encroached and they are both having trouble finding time to fulfill their volunteer tasks the way they would like to. The Group Director is responsible for coordinating with groups that contact the club for special visits.
    [Show full text]
  • The Night Sky of December 2013 Dr
    The Night Sky of December 2013 Dr. Wayne Wooten Professor of Astronomy For December 2013, the Moon will be new on December 3. The first two weeks find the moon waxing in the evening sky. The waxing crescent moon passes 7.5 degrees north of Venus on December 5th. The moon is first quarter on December 9th, and will interfere with the peak of the Geminid Meteor Shower on December 14th. The Full Moon, the Long Night Moon, is on December 17th. The winter solstice occurs at 11:11 AM CST on December 21st, and winter begins on the shortest day of the year. The waning gibbous moon passes five degrees south of Jupiter in the evening of December 19th. The last quarter moon rises at midnight on Christmas Day and passes 4 degrees south of reddish Mars. The waning crescent passes a degree south of Saturn in the dawn on December 29th. While the naked eye, dark adapted by several minutes away from any bright lights, is a wonderful instrument to stare up into deep space, far beyond our own Milky Way, binoculars are better for spotting specific deep sky objects. For a detailed map of northern hemisphere skies, about November 30th visit the www.skymaps.com website and download the map for December 2012; it will have a more extensive calendar, and list of best objects for the naked eyes, binoculars, and scopes on the back of the map. Sky& Telescope magazine, with PBS stations, now sponsor a fine five minute weekly sky video, “SkyWeek”, found at http://www.skyandtelescope.com/.
    [Show full text]
  • Sky & Telescope
    Eclipse from the See Sirius B: The Nearest Spot the Other EDGE OF SPACE p. 66 WHITE DWARF p. 30 BLUE PLANETS p. 50 THE ESSENTIAL GUIDE TO ASTRONOMY What Put the Bang in the Big Bang p. 22 Telescope Alignment Made Easy p. 64 Explore the Nearby Milky Way p. 32 How to Draw the Moon p. 54 OCTOBER 2013 Cosmic Gold Rush Racing to fi nd exploding stars p. 16 Visit SkyandTelescope.com Download Our Free SkyWeek App FC Oct2013_J.indd 1 8/2/13 2:47 PM “I can’t say when I’ve ever enjoyed owning anything more than my Tele Vue products.” — R.C, TX Tele Vue-76 Why Are Tele Vue Products So Good? Because We Aim to Please! For over 30-years we’ve created eyepieces and telescopes focusing on a singular target; deliver a cus- tomer experience “...even better than you imagined.” Eyepieces with wider, sharper fields of view so you see more at any power, Rich-field refractors with APO performance so you can enjoy Andromeda as well as Jupiter in all their splendor. Tele Vue products complement each other to pro- vide an observing experience as exquisite in performance as it is enjoyable and effortless. And how do we score with our valued customers? Judging by superlatives like: “in- credible, truly amazing, awesome, fantastic, beautiful, work of art, exceeded expectations by a mile, best quality available, WOW, outstanding, uncom- NP101 f/5.4 APO refractor promised, perfect, gorgeous” etc., BULLSEYE! See these superlatives in with 110° Ethos-SX eye- piece shown on their original warranty card context at TeleVue.com/comments.
    [Show full text]
  • The Dipole Anisotropy of the 2 Micron All-Sky Redshift Survey
    Mon. Not. R. Astron. Soc. 368, 1515–1526 (2006) doi:10.1111/j.1365-2966.2006.10243.x The dipole anisotropy of the 2 Micron All-Sky Redshift Survey Downloaded from https://academic.oup.com/mnras/article-abstract/368/4/1515/1151639 by MIDDLE EAST TECHNICAL UNIVERSITY LIBRARY user on 24 July 2020 , P. Erdo˘gdu,1,2 J. P. Huchra,3 O. Lahav,2 4 M. Colless,5 R. M. Cutri,6 E. Falco,3 T. George,7 T. Jarrett,6 D. H. Jones,8 C. S. Kochanek,9 L. Macri,10 J. Mader,11 N. Martimbeau,3 M. Pahre,3 Q. Parker,12 A. Rassat4 and W. Saunders5,13 1Department of Physics, Middle East Technical University, 06531 Ankara, Turkey 2School of Physics & Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD 3Harvard-Smithsonian Center of Astrophysics, 60 Garden Street, MS-20, Cambridge, MA 02138, USA 4Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT 5Anglo-Australian Observatory, PO Box 296, Epping, NSW 2052, Australia 6Infrared Processing and Analysis Center, California Institute of Technology, Pasadena, CA 91125, USA 7California Institute of Technology, 4800 Oak Grove Drive, 302-231, Pasadena, CA 91109, USA 8Research School of Astronomy and Astrophysics, Mount Stromlo, and Siding Spring Observatories, Cotter Road, Weston Creek, ACT 2611, Australia 9Department of Astronomy, Ohio State University, 4055 McPherson Lab, 140 West 18th Avenue, Columbus, OH 43221, USA 10National Optical Astronomy Observatory, 950 North Cherry Avenue, Tucson, AZ 85726, USA 11W.M. Keck Observatory, Kamuela, HI 96743, USA 12Department of Physics, Macquarie University, Sydney, NWS 2109, Australia 13Royal Observatory, Blackford Hill, Edinburgh, EH9 3HJ Accepted 2006 February 23.
    [Show full text]
  • Hercules a Monthly Sky Guide for the Beginning to Intermediate Amateur Astronomer Tom Trusock - 7/09
    Small Wonders: Hercules A monthly sky guide for the beginning to intermediate amateur astronomer Tom Trusock - 7/09 Dragging forth the summer Milky Way, legendary strongman Hercules is yet another boundary constellation for the summer season. His toes are dipped in the stream of our galaxy, his head is firm in the depths of space. Hercules is populated by a dizzying array of targets, many extra-galactic in nature. Galaxy clusters abound and there are three Hickson objects for the aficionado. There are a smattering of nice galaxies, some planetary nebulae and of course a few very nice globular clusters. 2/19 Small Wonders: Hercules Widefield Finder Chart - Looking high and south, early July. Tom Trusock June-2009 3/19 Small Wonders: Hercules For those inclined to the straightforward list approach, here's ours for the evening: Globular Clusters M13 M92 NGC 6229 Planetary Nebulae IC 4593 NGC 6210 Vy 1-2 Galaxies NGC 6207 NGC 6482 NGC 6181 Galaxy Groups / Clusters AGC 2151 (Hercules Cluster) Tom Trusock June-2009 4/19 Small Wonders: Hercules Northern Hercules Finder Chart Tom Trusock June-2009 5/19 Small Wonders: Hercules M13 and NGC 6207 contributed by Emanuele Colognato Let's start off with the masterpiece and work our way out from there. Ask any longtime amateur the first thing they think of when one mentions the constellation Hercules, and I'd lay dollars to donuts, you'll be answered with the globular cluster Messier 13. M13 is one of the easiest objects in the constellation to locate. M13 lying about 1/3 of the way from eta to zeta, the two stars that define the westernmost side of the keystone.
    [Show full text]
  • Draft181 182Chapter 10
    Chapter 10 Formation and evolution of the Local Group 480 Myr <t< 13.7 Gyr; 10 >z> 0; 30 K > T > 2.725 K The fact that the [G]alactic system is a member of a group is a very fortunate accident. Edwin Hubble, The Realm of the Nebulae Summary: The Local Group (LG) is the group of galaxies gravitationally associ- ated with the Galaxy and M 31. Galaxies within the LG have overcome the general expansion of the universe. There are approximately 75 galaxies in the LG within a 12 diameter of ∼3 Mpc having a total mass of 2-5 × 10 M⊙. A strong morphology- density relation exists in which gas-poor dwarf spheroidals (dSphs) are preferentially found closer to the Galaxy/M 31 than gas-rich dwarf irregulars (dIrrs). This is often promoted as evidence of environmental processes due to the massive Galaxy and M 31 driving the evolutionary change between dwarf galaxy types. High Veloc- ity Clouds (HVCs) are likely to be either remnant gas left over from the formation of the Galaxy, or associated with other galaxies that have been tidally disturbed by the Galaxy. Our Galaxy halo is about 12 Gyr old. A thin disk with ongoing star formation and older thick disk built by z ≥ 2 minor mergers exist. The Galaxy and M 31 will merge in 5.9 Gyr and ultimately resemble an elliptical galaxy. The LG has −1 vLG = 627 ± 22 km s with respect to the CMB. About 44% of the LG motion is due to the infall into the region of the Great Attractor, and the remaining amount of motion is due to more distant overdensities between 130 and 180 h−1 Mpc, primarily the Shapley supercluster.
    [Show full text]
  • 1949 Celebrating 65 Years of Bringing Astronomy to North Texas 2014
    1949 Celebrating 65 Years of Bringing Astronomy to North Texas 2014 Contact information: Inside this issue: Info Officer (General Info)– [email protected]@fortworthastro.com Website Administrator – [email protected] Postal Address: Page Fort Worth Astronomical Society July Club Calendar 3 3812 Fenton Avenue Fort Worth, TX 76133 Celestial Events 4 Web Site: http://www.fortworthastro.org Facebook: http://tinyurl.com/3eutb22 Sky Chart 5 Twitter: http://twitter.com/ftwastro Yahoo! eGroup (members only): http://tinyurl.com/7qu5vkn Moon Phase Calendar 6 Officers (2014-2015): Mecury/Venus Data Sheet 7 President – Bruce Cowles, [email protected] Vice President – Russ Boatwright, [email protected] Young Astronomer News 8 Sec/Tres – Michelle Theisen, [email protected] Board Members: Cloudy Night Library 9 2014-2016 The Astrolabe 10 Mike Langohr Tree Oppermann AL Obs Club of the Month 14 2013-2015 Bill Nichols Constellation of the Month 15 Jim Craft Constellation Mythology 19 Cover Photo This is an HaLRGB image of M8 & Prior Club Meeting Minutes 23 M20, composed entirely from a T3i General Club Information 24 stack of one shot color. Collected the data over a period of two nights. That’s A Fact 24 Taken by FWAS member Jerry Keith November’s Full Moon 24 Observing Site Reminders: Be careful with fire, mind all local burn bans! FWAS Foto Files 25 Dark Site Usage Requirements (ALL MEMBERS): Maintain Dark-Sky Etiquettehttp://tinyurl.com/75hjajy ( ) Turn out your headlights at the gate! Sign
    [Show full text]