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Practical Calculations for Designing a Newtonian Telescope
Practical Calculations for Designing a Newtonian Telescope Jeff Beish (Rev. 07 February 2019) INTRODUCTION A Newtonian reflecting telescope can be designed to perform more efficiently than any other type of optical system, if one is careful to follow the laws of nature. One must have optics made from precision Pyrex or a similar material and figured to a high quality. The mounting hardware must be well planned out and properly constructed using highest quality materials. The Newtonian can be used for visual or photographic work, for "deep sky" or "planetary" observing, or a combination of all these. They are easy to layout and to construct using simple household tools. The design mathematics is simple and can be easily accomplished by hand calculator. The Newtonian reflector can be easily modified for other types of observing such a photometry, photography, CCD imaging, micrometer work, and more. Since a reflecting telescope does not suffer for chromatic aberration we don't have to worry about focusing each color while observing or photographing with filters as we would in a single or double lens refractor. This is a problem especially associated with photography. Since the introduction of the relatively low cost Apochromatic refractors (APO) in the past few years these problems no longer hamper the astrophotographer as much. However, the cost of large APO's for those requiring large apertures is prohibitive to most of us who require instruments above 12 or so inches. Remember, even with the highest quality optics a Newtonian can be rendered nearly useless by tube currents, misaligned components, mirror stain, and a secondary mirror too large for the application of the instrument. -
Edwin Powell Hubble Papers: Finding Aid
http://oac.cdlib.org/findaid/ark:/13030/tf7b69n8rd Online items available Edwin Powell Hubble Papers: Finding Aid Processed by Ronald S. Brashear, completed December 12, 1997; machine-readable finding aid created by Xiuzhi Zhou and updated by Diann Benti in June 2017. The Huntington Library, Art Collections, and Botanical Gardens Manuscripts Department 1151 Oxford Road San Marino, California 91108 Phone: (626) 405-2191 Email: [email protected] URL: http://www.huntington.org © 1998 The Huntington Library. All rights reserved. Edwin Powell Hubble Papers: mssHUB 1-1098 1 Finding Aid Overview of the Collection Title: Edwin Powell Hubble Papers Dates (inclusive): 1900-1989 Collection Number: mssHUB 1-1098 Creator: Hubble, Edwin, 1889-1953. Extent: 1300 pieces, plus ephemera in 34 boxes Repository: The Huntington Library, Art Collections, and Botanical Gardens. Manuscripts Department 1151 Oxford Road San Marino, California 91108 Phone: (626) 405-2191 Email: [email protected] URL: http://www.huntington.org Abstract: This collection contains the papers of Edwin P. Hubble (1889-1953), an astronomer at the Mount Wilson Observatory near Pasadena, California. as well as the diaries and biographical memoirs of his wife, Grace Burke Hubble. Language: English. Access Open to qualified researchers by prior application through the Reader Services Department. For more information, contact Reader Services. Publication Rights The Huntington Library does not require that researchers request permission to quote from or publish images of this material, nor does it charge fees for such activities. The responsibility for identifying the copyright holder, if there is one, and obtaining necessary permissions rests with the researcher. Preferred Citation [Identification of item]. -
The Reflecting Telescope
The Reflecting Telescope Lens telescopes exist since 1609 when the Dutch maker of The optical properties data of the AstroMedia* reflecting tel- spectacles, Jan Lippershey, sold the first telescopes, then as escope roughly correspond to those of the first instrument a curiosity, to his astonished customers. It was made out of a built by Newton. The mirror has a focal length f=450mm (”f” concave and a convex lens, produced an upright standing from the Latin ”focus” is the abbreviation of focal length). It’s image and had a 3 1/2 times magnification. Galileo Galilei curve is spherical, i.e. is has the same round surface as a (1564-1642) improved on this invention and was the first to globe. make astronomical observations with it. Today almost A spherical concave mirror has one disadvantage: the all lens telescopes are built according to the prin- light rays reflected from the edge meet a little nearer ciples of Johannes Kepler (1571-1630). His tel- to the mirror than those reflected from the centre, escope, based on two convex lenses, produced causing a slight focus distortion. However, since an upside down but much bigger and better this distortion is is not grave and such mirrors focused image which of course for observing are relatively easy to grind, they are neverthe- the heavens are the most important factors. less used in smaller telescopes. In telescopes Building larger telescopes however with larger openings and stronger mag- brings two problems with it: Firstly, nification mirrors with parabolic curves in a lens the light rays are broken, are used. -
Telescopes and Binoculars
Continuing Education Course Approved by the American Board of Opticianry Telescopes and Binoculars National Academy of Opticianry 8401 Corporate Drive #605 Landover, MD 20785 800-229-4828 phone 301-577-3880 fax www.nao.org Copyright© 2015 by the National Academy of Opticianry. All rights reserved. No part of this text may be reproduced without permission in writing from the publisher. 2 National Academy of Opticianry PREFACE: This continuing education course was prepared under the auspices of the National Academy of Opticianry and is designed to be convenient, cost effective and practical for the Optician. The skills and knowledge required to practice the profession of Opticianry will continue to change in the future as advances in technology are applied to the eye care specialty. Higher rates of obsolescence will result in an increased tempo of change as well as knowledge to meet these changes. The National Academy of Opticianry recognizes the need to provide a Continuing Education Program for all Opticians. This course has been developed as a part of the overall program to enable Opticians to develop and improve their technical knowledge and skills in their chosen profession. The National Academy of Opticianry INSTRUCTIONS: Read and study the material. After you feel that you understand the material thoroughly take the test following the instructions given at the beginning of the test. Upon completion of the test, mail the answer sheet to the National Academy of Opticianry, 8401 Corporate Drive, Suite 605, Landover, Maryland 20785 or fax it to 301-577-3880. Be sure you complete the evaluation form on the answer sheet. -
Find Your Telescope. Your Find Find Yourself
FIND YOUR TELESCOPE. FIND YOURSELF. FIND ® 2008 PRODUCT CATALOG WWW.MEADE.COM TABLE OF CONTENTS TELESCOPE SECTIONS ETX ® Series 2 LightBridge ™ (Truss-Tube Dobsonians) 20 LXD75 ™ Series 30 LX90-ACF ™ Series 50 LX200-ACF ™ Series 62 LX400-ACF ™ Series 78 Max Mount™ 88 Series 5000 ™ ED APO Refractors 100 A and DS-2000 Series 108 EXHIBITS 1 - AutoStar® 13 2 - AutoAlign ™ with SmartFinder™ 15 3 - Optical Systems 45 FIND YOUR TELESCOPE. 4 - Aperture 57 5 - UHTC™ 68 FIND YOURSEL F. 6 - Slew Speed 69 7 - AutoStar® II 86 8 - Oversized Primary Mirrors 87 9 - Advanced Pointing and Tracking 92 10 - Electronic Focus and Collimation 93 ACCESSORIES Imagers (LPI,™ DSI, DSI II) 116 Series 5000 ™ Eyepieces 130 Series 4000 ™ Eyepieces 132 Series 4000 ™ Filters 134 Accessory Kits 136 Imaging Accessories 138 Miscellaneous Accessories 140 Meade Optical Advantage 128 Meade 4M Community 124 Astrophotography Index/Information 145 ©2007 MEADE INSTRUMENTS CORPORATION .01 RECRUIT .02 ENTHUSIAST .03 HOT ShOT .04 FANatIC Starting out right Going big on a budget Budding astrophotographer Going deeper .05 MASTER .06 GURU .07 SPECIALIST .08 ECONOMIST Expert astronomer Dedicated astronomer Wide field views & images On a budget F IND Y OURSEL F F IND YOUR TELESCOPE ® ™ ™ .01 ETX .02 LIGHTBRIDGE™ .03 LXD75 .04 LX90-ACF PG. 2-19 PG. 20-29 PG.30-43 PG. 50-61 ™ ™ ™ .05 LX200-ACF .06 LX400-ACF .07 SERIES 5000™ ED APO .08 A/DS-2000 SERIES PG. 78-99 PG. 100-105 PG. 108-115 PG. 62-76 F IND Y OURSEL F Astronomy is for everyone. That’s not to say everyone will become a serious comet hunter or astrophotographer. -
Solar System Solar System
Delta Science Reader SolarSolar SystemSystem Delta Science Readers are nonfiction student books that provide science background and support the experiences of hands-on activities. Every Delta Science Reader has three main sections: Think About . , People in Science, and Did You Know? Be sure to preview the reader Overview Chart on page 4, the reader itself, and the teaching suggestions on the following pages. This information will help you determine how to plan your schedule for reader selections and activity sessions. Reading for information is a key literacy skill. Use the following ideas as appropriate for your teaching style and the needs of your students. The After Reading section includes an assessment and writing links. OVERVIEW Students will: discover facts about the Solar System In the Delta Science Reader Solar System, students take a tour of the Sun and the explore the planets and other objects in the planets. Other space objects such as dwarf Solar System planets, comets, asteroids, and meteoroids discuss the function of a table of contents, are explored. Students read about the headings, and a glossary rotation and revolution of the planets and interpret photographs and graphics to the causes of night and day, seasonal answer questions changes, and the phases of the Moon. The book describes the work of a planetary complete a KWL chart geologist. In addition, students discover organize information in a variety of ways how telescopes work. delta science modules Solar System 119 © Delta Education LLC. All rights reserved. -
2004-2005 Annual Report
Anglo-Australian Observatory Annual Report of the Anglo-Australian Telescope Board 1 July 2004 to 30 June 2005 Anglo-Australian Observatory 167 Vimiera Road Eastwood NSW 2122 Australia Postal Address: PO Box 296 Epping NSW 1710 Australia Telephone: (02) 9372 4800 (international) + 61 2 9372 4800 Facsimile: (02) 9372 4880 (international) + 61 2 9372 4880 e-mail: [email protected] Website: http://www.aao.gov.au/ Annual Report Website: http://www.aao.gov.au/annual/ Anglo-Australian Telescope Board Address as above Telephone: (02) 9372 4813 (international) + 61 2 9372 4813 e-mail: [email protected] ABN: 71871323905 © Anglo-Australian Telescope Board 2005 ISSN 1443-8550 Cover: Dome of the UK Schmidt Telescope. Photo courtesy Shaun Amy. Combined H-alpha and Red colour mosaic image of the Vela Supernova remnant taken from several AAO/UK Schmidt Telescope H- alpha survey fields. Image produced by Mike Read and Quentin Parker Cover Design: TTR Print Management Computer Typeset: Anglo-Australian Observatory Picture Credits: The editors would like to thank for their photographs and images throughout this publication Shaun Amy, Stuart Bebb (Physics Photo- graphic Unit, Oxford), Jurek Brzeski, Chris Evans, Kristin Fiegert, David James, Urs Klauser, David Malin, Chris McCowage and Andrew McGrath ii AAO Annual Report 2004–2005 The Honourable Dr Brendan Nelson, MP, Minister for Education, Science and Training Government of the Commonwealth of Australia The Right Honourable Alan Johnson, MP, Secretary of State for Trade and Industry, Government of the United Kingdom of Great Britain and Northern Ireland In accordance with Article 8 of the Agreement between the Australian Government and the Government of the United Kingdom to provide for the establishment and operation of an optical telescope at Siding Spring Mountain in the state of New South Wales, I present herewith a report by the Anglo-Australian Telescope Board for the year from 1 July 2004 to 30 June 2005. -
Precision Optics Manufacturing and Control for Next-Generation Large
Nanomanufacturing and Metrology https://doi.org/10.1007/s41871-019-00038-2 REVIEW PAPERS Precision Optics Manufacturing and Control for Next‑Generation Large Telescopes Logan R. Graves1 · Greg A. Smith1 · Dániel Apai2,3 · Dae Wook Kim1,2 Received: 2 December 2018 / Revised: 4 February 2019 / Accepted: 7 February 2019 © International Society for Nanomanufacturing and Tianjin University and Springer Nature Singapore Pte Ltd. 2019 Abstract Next-generation astronomical telescopes will ofer unprecedented observational and scientifc capabilities to look deeper into the heavens, observe closer in time to the epoch of the Big Bang, and resolve fner details of phenomena throughout the universe. The science case for this next generation of observatories is clear, with science goals such as the discovery and exploration of extrasolar planets, exploration of dark matter and dark energy, the formation and evolution of planets, stars, galaxies, and detailed studies of the Sun. Enabling breakthrough astronomical goals requires novel and cutting-edge design choices at all stages of telescope manufacturing. In this paper, we discuss the integrated design and manufacturing of the next-generation large telescopes, from the optical design to enclosures required for optimal performance. Keywords Metrology · Fabrication · Design · Telescope · Optics · Precision 1 Introduction Expanding View of the Universe—Science with the Euro- pean Extremely Large Telescope [2]. To provide these scien- Astronomers studying new phenomena and testing increas- tifc capacities and to advance instrumentation capabilities, ingly detailed models of the universe require ever more pow- the next generation of telescopes (NGT) must provide higher erful instruments to complete their goals and collect photons spatial resolutions, larger light-collecting areas, and more which have traversed immense distances and time, some- sensitive instrumentation. -
Researchers Hunting Exoplanets with Superconducting Arrays
Cryocoolers, a Brief Overview .............................. 8 NASA Preps Four Telescope Missions .............. 37 Lake Shore Celebrates 50 Years ....................... 22 ICCRT Recap ..................................................... 38 Recovering Cold Energy and Waste Heat ............ 32 3-D Printing from Aqueous Materials .................. 40 Exoplanet Hunt with ADR-Cooled Superconducting Detector Arrays | 34 Volume 34 Number 3 Researchers Hunting Exoplanets with Superconducting Arrays The key to revealing the exoplanets tucked away around the universe may just be locked up in the advancement of Microwave Kinetic Inductance Detectors (MKIDs), an array of superconducting de- tectors made from platinum sillicide and housed in a cryostat at 100 mK. An astronomy team led by Dr. Benjamin Mazin at the University of California Santa Barbara is using MKID arrays for research on two telescopes, the Hale telescope at Palomar Observatory near San Diego and the Subaru telescope located at the Maunakea Observatory on Hawaii. Mazin began work on MKIDs nearly two decades ago while working under Dr. Jonas Zmuidzinas at Caltech, who co-pioneered the detectors for cosmic microwave background astronomy with Dr. Henry LeDuc at JPL. A look inside the DARKNESS cryostat. Image: Mazin Mazin has since adapted and ad- vanced the technology for the direct im- aging of exoplanets. With direct imaging, telescopes detect light from the planet itself, recording either the self-luminous thermal infrared light that young—and still hot—planets give off, or reflected light from a star that bounces off a planet and then towards the detector. Researchers have previously relied on indirect methods to search for exo- planets, including the radial velocity technique that looks at the spectrum of a star as it’s pushed and pulled by its planetary companions; and transit pho- tometry, where a dip in the brightness of a star is detected as planets cross in front The astronomy team working with Dr. -
Psychology of Aesthetics, Creativity, and the Arts
Psychology of Aesthetics, Creativity, and the Arts Foresight, Insight, Oversight, and Hindsight in Scientific Discovery: How Sighted Were Galileo's Telescopic Sightings? Dean Keith Simonton Online First Publication, January 30, 2012. doi: 10.1037/a0027058 CITATION Simonton, D. K. (2012, January 30). Foresight, Insight, Oversight, and Hindsight in Scientific Discovery: How Sighted Were Galileo's Telescopic Sightings?. Psychology of Aesthetics, Creativity, and the Arts. Advance online publication. doi: 10.1037/a0027058 Psychology of Aesthetics, Creativity, and the Arts © 2012 American Psychological Association 2012, Vol. ●●, No. ●, 000–000 1931-3896/12/$12.00 DOI: 10.1037/a0027058 Foresight, Insight, Oversight, and Hindsight in Scientific Discovery: How Sighted Were Galileo’s Telescopic Sightings? Dean Keith Simonton University of California, Davis Galileo Galilei’s celebrated contributions to astronomy are used as case studies in the psychology of scientific discovery. Particular attention was devoted to the involvement of foresight, insight, oversight, and hindsight. These four mental acts concern, in divergent ways, the relative degree of “sightedness” in Galileo’s discovery process and accordingly have implications for evaluating the blind-variation and selective-retention (BVSR) theory of creativity and discovery. Scrutiny of the biographical and historical details indicates that Galileo’s mental processes were far less sighted than often depicted in retrospective accounts. Hindsight biases clearly tend to underline his insights and foresights while ignoring his very frequent and substantial oversights. Of special importance was how Galileo was able to create a domain-specific expertise where no such expertise previously existed—in part by exploiting his extensive knowledge and skill in the visual arts. Galileo’s success as an astronomer was founded partly and “blindly” on his artistic avocations. -
The JWST/Nircam Coronagraph: Mask Design and Fabrication
The JWST/NIRCam coronagraph: mask design and fabrication John E. Krista, Kunjithapatham Balasubramaniana, Charles A. Beichmana, Pierre M. Echternacha, Joseph J. Greena, Kurt M. Liewera, Richard E. Mullera, Eugene Serabyna, Stuart B. Shaklana, John T. Traugera, Daniel W. Wilsona, Scott D. Hornerb, Yalan Maob, Stephen F. Somersteinb, Gopal Vasudevanb, Douglas M. Kellyc, Marcia J. Riekec aJet Propulsion Laboratory/California Institute of Technology, 4800 Oak Grove Drive, Pasasdena, CA, USA 91109; bLockheed Martin Advanced Technology Center, Palo Alto, CA, USA 94303; cUniversity of Arizona, Tucson, AZ, USA 85721 ABSTRACT The NIRCam instrument on the James Webb Space Telescope will provide coronagraphic imaging from λ=1-5 µm of high contrast sources such as extrasolar planets and circumstellar disks. A Lyot coronagraph with a variety of circular and wedge-shaped occulting masks and matching Lyot pupil stops will be implemented. The occulters approximate grayscale transmission profiles using halftone binary patterns comprising wavelength-sized metal dots on anti-reflection coated sapphire substrates. The mask patterns are being created in the Micro Devices Laboratory at the Jet Propulsion Laboratory using electron beam lithography. Samples of these occulters have been successfully evaluated in a coronagraphic testbed. In a separate process, the complex apertures that form the Lyot stops will be deposited onto optical wedges. The NIRCam coronagraph flight components are expected to be completed this year. Keywords: NIRCam, JWST, James Webb Space Telescope, coronagraph 1. INTRODUCTION 1.1 The planet/star contrast problem Observations of extrasolar planet formation (e.g. protoplanetary disks) and planetary systems are hampered by the large contrast differences between these targets and their much brighter stars. -
Distributed Control of a Segmented Telescope Mirror
Distributed Control of a Segmented Telescope Mirror by Dan Kerley B.Eng., University of Victoria, 2004 A Thesis Submitted in Partial Fulfillment of the Requirements for the Degree of MASTER OF APPLIED SCIENCE in the Department of Mechanical Engineering Dan Kerley, 2010 University of Victoria All rights reserved. This thesis may not be produced in whole or in part, by photocopy or other means, without the permission of the author ii Distributed Control of a Segmented Telescope Mirror by Dan Kerley B.Eng., University of Victoria, 2004 Supervisory Committee Dr. Edward Park (Department of Mechanical Engineering) Supervisor Dr. Afzal Suleman (Department of Mechanical Engineering) Department Member Dr. Panajotis Agathoklis (Department of Electrical & Computer Engineering) Outside Member Ms. Jennifer Dunn (Herzberg Institute of Astrophysics) Additional Member iii SUPERVISORY COMMITTEE Dr. Edward Park (Department of Mechanical Engineering) Supervisor Dr. Afzal Suleman (Department of Mechanical Engineering) Department Member Dr. Panajotis Agathoklis (Department of Electrical & Computer Engineering) Non-Department Member Ms. Jennifer Dunn (Herzberg Institute of Astrophysics) Additional Member ABSTRACT As astronomers continue to examine fainter objects and farther back in time, they require increasingly large telescopes due to the fundamental diffraction of optical elements. Therefore several of the next generation optical telescopes will employ extremely large primary mirrors. However to realistically construct mirrors of these magnitudes they will need to be assembled as a collection of many smaller mirrors. This mirror segmentation leads to the additional challenge of aligning the smaller mirror elements with respect to one another, and maintain that alignment in the presence of disturbances on the optical surface and its supporting structure.