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Seven gallium doped germanium (Ge:Ga) photoconductive infrared detectors were fabricated and mounted in integrating cavities. In addition, a cold preamplifier package consisting of J230 junction field effect transistors (JFETs) was produced. Tests of the system under low photon background conditions indicated that sensitivity was limited by the Johnson noise of the load resistor. The detectors were mounted in the Ames cooled grating spectrometer, and flown on the Kuiper Airborne Observatory. Good quality astronomical data were obtained during the flight of 7 July 1983.

Seven gallium doped germanium (Ge:Ga) photoconductive infrared detectors were fabricated and mounted in integrating cavities. In addition, a cold preamplifier package consisting of J230 junction field effect transistors (JFETs) was produced. Tests of the system under low photon background conditions indicated that sensitivity was limited by the Johnson noise of the load resistor. The detectors were mounted in the Ames cooled grating spectrometer, and flown on the Kuiper Airborne Observatory. Good quality astronomical data were obtained during the flight of 7 July 1983.

Seven gallium doped germanium (Ge:Ga) photoconductive infrared detectors were fabricated and mounted in integrating cavities. In addition, a cold preamplifier package consisting of J230 junction field effect transistors (JFETs) was produced. Tests of the system under low photon background conditions indicated that sensitivity was limited by the Johnson noise of the load resistor. The detectors were mounted in the Ames cooled grating spectrometer, and flown on the Kuiper Airborne Observatory. Good quality astronomical data were obtained during the flight of 7 July 1983.

Seven gallium doped germanium (Ge:Ga) photoconductive infrared detectors were fabricated and mounted in integrating cavities. In addition, a cold preamplifier package consisting of J230 junction field effect transistors (JFETs) was produced. Tests of the system under low photon background conditions indicated that sensitivity was limited by the Johnson noise of the load resistor. The detectors were mounted in the Ames cooled grating spectrometer, and flown on the Kuiper Airborne Observatory. Good quality astronomical data were obtained during the flight of 7 July 1983.

The self-proclaimed natural scientist Sam Han Lee (aka Tathagata) meeting a professor of astronomy and lunar science, the late Prof. Arlin Crotts 

The self-proclaimed natural scientist Sam Han Lee (aka Tathagata) meeting a professor of astronomy and lunar science, the late Prof. Arlin Crotts 

Zoomable full resolution image available at davidrumsey.com . This image 3432.002 is a part of image group 3432.000 . 12 Diagrams showing the solar system, 28.5x23. Dated 1846-1851. Many are transparent illuminating the views by light passing through. Engraved by Jon Emslie, published by James Reynolds, loose in olive green embossed portfolio titled "Astronomical diagrams" in gilt. Includes text: Companion to Reynolds's series of astronomical and geographical diagrams. With Definition of terms used in astronomy and geography on verso. See note field above. None found.

Zoomable full resolution image available at davidrumsey.com . This image 3432.002 is a part of image group 3432.000 . 12 Diagrams showing the solar system, 28.5x23. Dated 1846-1851. Many are transparent illuminating the views by light passing through. Engraved by Jon Emslie, published by James Reynolds, loose in olive green embossed portfolio titled "Astronomical diagrams" in gilt. Includes text: Companion to Reynolds's series of astronomical and geographical diagrams. With Definition of terms used in astronomy and geography on verso. See note field above. None found.

Zoomable full resolution image available at davidrumsey.com . This image 3432.002 is a part of image group 3432.000 . 12 Diagrams showing the solar system, 28.5x23. Dated 1846-1851. Many are transparent illuminating the views by light passing through. Engraved by Jon Emslie, published by James Reynolds, loose in olive green embossed portfolio titled "Astronomical diagrams" in gilt. Includes text: Companion to Reynolds's series of astronomical and geographical diagrams. With Definition of terms used in astronomy and geography on verso. See note field above. None found.

Star Gazer Astronomy (Disk 1)

Star Gazer Astronomy (Disk 1)

Star Gazer Astronomy (Disk 1)

GAAC Meeting, Friday, November 12, 2021, with Guest Speaker Kelly Beatty, science writer and Senior Editor at Sky & Telescope magazine, and his compelling story of the discovery of Pluto, its eventual demotion, and the New Horizons mission to the dwarf planet. ---------------------------------------------------------- 1623 Studios is a #nonprofit organization dedicated to producing community programming for #CapeAnn—Gloucester, Rockport, Manchester-by-the-Sea, and Essex—and to providing a forum for the free exchange of information and ideas. We also provide a full spectrum of creative services to support our mission. Learn more at https://1623studios.org

GAAC Meeting, Friday, November 12, 2021, with Guest Speaker Kelly Beatty, science writer and Senior Editor at Sky & Telescope magazine, and his compelling story of the discovery of Pluto, its eventual demotion, and the New Horizons mission to the dwarf planet. ---------------------------------------------------------- 1623 Studios is a #nonprofit organization dedicated to producing community programming for #CapeAnn—Gloucester, Rockport, Manchester-by-the-Sea, and Essex—and to providing a forum for the free exchange of information and ideas. We also provide a full spectrum of creative services to support our mission. Learn more at https://1623studios.org

SOFIA is a 2.5 meter airborne infrared telescope, mounted in a Boeing 747SP aircraft. Due to the large size of the telescope, only a few degrees of azimuth are available at the telescope bearing. This means the heading of the aircraft is fundamentally associated with the telescope's observation targets, and the ground track necessary to enable a given mission is highly complex and dependent on the coordinates, duration, and order of observations to be performed. We have designed and implemented a Flight Management Infrastructure (FMI) product in order to plan and execute such missions in the presence of a large number of external constraints (e.g. restricted airspace, international boundaries, elevation limits of the telescope, aircraft performance, winds at altitude, and ambient temperatures). We present an overview of the FMI, including the process, constraints and basic algorithms used to plan and execute SOFIA missions.

Modern Terrestrial Cerenkov Telescopes and Array Scintillators facing the Horizons may soon reveal far Cosmic Rays or nearer PeVs-EeVs Neutrino Showers Astronomy. Indeed UHE neutrino interactions in air, leading to Horizontal Showers, may take place through several channels: the main Glashow resonant one, the charged nuclear interactions and the neutral current events. Analogous events occur also for the neutrino-nucleon events. These interactions are producing hadronic or electromagnetic showers at the far horizons and their correlated secondaries Cerenkov flashes. Comparable interactions are producing, inside the Earth, the Horizontal, but Up-going ultra-relativistic tau, whose decay in flight is source of tau Air Showers (Uptaus and HorTaus); Horizontal Tau Air-Showers are rarely (one-two order of magnitude) enhanced by highest mountain chains at horizons, as in AUGER experimental site; their hadronic or electromagnetic traces are preferentially at PeV-EeV energies; their tracks are amplified by their muon-gamma bundles whose signals are above the random noises and better disentangled by Cerenkov flashes in time coincidence. More exotic UHE SUSY interactions at tens PeVs-EeV energy may blaze at Horizons. Anyway common High Energy Cosmic rays at PeVs-EeVs energy must traces their presence in Magic-like Cerenkov Telescopes at horizons. Present Magic Telescopes facing the Horizons are, at equal given time, almost comparable with the Amanda underground neutrino detector.

Although cosmic rays were discovered a century ago, we do not know where or how they are accelerated. There is a realistic hope that the oldest problem in astronomy will be solved soon by ambitious experimentation: air shower arrays of 10,000 kilometer-square area, arrays of air Cerenkov telescopes and kilometer- scale neutrino observatories. Their predecessors are producing science. We will review the highlights: - Cosmic rays: the highest energy particles and the GZK cutoff, the search for cosmic accelerators and the the Cygnus region, top-down mechanisms: photons versus protons? - TeV-energy gamma rays: blazars, how molecular clouds may have revealed proton beams, first hints of the diffuse infrared background? - Neutrinos: first results and proof of concept for technologies to construct kilometer-scale observatories.

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This photograph shows the High Energy Astronomy Observatory (HEAO)-1 being assembled at TRW Systems of Redondo Beach, California. The HEAO was designed and developed by TRW, Inc. under the project management of the Marshall Space Flight Center. The first observatory, designated HEAO-1, was launched on August 12, 1977 aboard an Atlas/Centaur launch vehicle and was designed to survey the sky for additional x-ray and gamma-ray sources as well as pinpointing their positions. The HEAO-1 was originally identified as HEAO-A but the designation was changed once the spacecraft achieved orbit.

📢 On today’s #PasadenaMediaNewsUpdate: @CarnegieInstitution proudly presents the 2025 Astronomy Lecture Series at @TheHuntington, featuring groundbreaking discoveries from top astronomers. Upcoming Lectures: March 18th – Dr. Jessica Spake: The Strange Skies of Alien Worlds – Discover the bizarre atmospheres of exoplanets, from toxic gases to ruby clouds. March 31st – Dr. Rebecca Bernstein: In the Pursuit of Light – Explore the Giant Magellan Telescope and its revolutionary impact on astronomy. April 14th – Dr. David Vartanyan: From Stellar Death to Cosmic Rebirth – Unravel the mysteries of supernovae and their role in shaping the universe. May 6th – Dr. Anthony Piro: The Messy Eating Habits of Black Holes – Witness how black holes devour stars, leaving behind brilliant flares and eerie x-ray signals. Tickets are free, but reservations are required. Reservations open the morning after each event. Can't attend in person? Watch the livestream on Carnegie Science’s YouTube channel. Reserve your spot today! 🕓 Time: Doors open at 6:30 PM - Musical performance at 7:00 PM - Lecture at 7:30 PM 📍 Place: Rothenberg Hall in The Huntington Library, Art Museum, and Botanical Gardens 🌐 To learn more, visit: carnegiescience.edu #PasadenaMedia #AstronomyLectureSeries #CarnegieScience #SpaceDiscoveries #TheHuntington #Exoplanets #Supernovae #BlackHoles #GiantMagellanTelescope #CosmicExploration #Astrophysics #ScienceTalks #NASA ---------------------------------------------------------------- Carnegie Science drives groundbreaking research that reshapes our understanding of biology, Earth, and the universe. As a hub for interdisciplinary exploration, its scientists pursue bold inquiries—from the origins of the cosmos and life’s emergence to addressing climate change and sustainability—expanding knowledge across the natural world. ---------------------------------------------------------------- 📰 Want to stay up to date on all things happening in and around Pasadena? Subscribe to our channel and follow us on our social media for the latest news, events, and updates! From community events to local news, we've got you covered. Don't miss out—hit that subscribe button and stay connected with everything Pasadena!

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We show that many ancient Indian mythological legends are really allegorical depictions of astronomical and other physical phenomena of which the composers had a good idea. This detail enables us to also use techniques of astronomical chronology for dating various events.

We show that many ancient Indian mythological legends are really allegorical depictions of astronomical and other physical phenomena of which the composers had a good idea. This detail enables us to also use techniques of astronomical chronology for dating various events.

Book Source: Digital Library of India Item 2015.37958 dc.contributor.author: Russell, Henry Norris dc.contributor.author: Dugan, Raymond Smith dc.contributor.author: Stewart, John Quincy dc.date.accessioned: 2015-06-25T21:19:56Z dc.date.available: 2015-06-25T21:19:56Z dc.date.digitalpublicationdate: 2006-02-01 dc.date.citation: 1927 dc.identifier.barcode: 4990010205650 dc.identifier.origpath: /data3/upload/0059/802 dc.identifier.copyno: 1 dc.identifier.uri: http://www.new.dli.ernet.in/handle/2015/37958 dc.description.scanningcentre: C-DAK, Kolkata dc.description.main: 1 dc.description.tagged: 0 dc.description.totalpages: 510 dc.format.mimetype: application/pdf dc.language.iso: English dc.publisher.digitalrepublisher: Digital Library Of India dc.publisher: Ginn And Co., Boston dc.rights: In Public Domain dc.source.library: Meghnad Saha Collection dc.subject.classification: Natural Sciences dc.subject.classification: Astronomy. Astrophysics. Space Research.geodesy dc.subject.classification: Stars. Stellar System. The Universe dc.subject.keywords: Solar Spectrum dc.subject.keywords: Solar System dc.subject.keywords: Atomic Theory dc.title: Astronomy

Book Source: Digital Library of India Item 2015.31249 dc.contributor.author: Corbin, Thomas W. dc.date.accessioned: 2015-06-25T16:03:37Z dc.date.available: 2015-06-25T16:03:37Z dc.date.digitalpublicationdate: 2009-05-03 dc.date.citation: 1910 dc.identifier: VB Librarian dc.identifier.barcode: 4990010195138 dc.identifier.origpath: /data2/upload/0049/290 dc.identifier.copyno: 1 dc.identifier.uri: http://www.new.dli.ernet.in/handle/2015/31249 dc.description.scanningcentre: C-DAK, Kolkata dc.description.main: 1 dc.description.tagged: 0 dc.description.totalpages: 176 dc.format.mimetype: application/pdf dc.language.iso: English dc.publisher.digitalrepublisher: Digital Library Of India dc.publisher: C. Arthur Pearson Ltd, London dc.rights: In Public Domain dc.source.library: Central Library, Visva-bharati dc.subject.classification: Astronomy dc.subject.classification: Astronomy-popular Works dc.subject.keywords: Astronomy dc.subject.keywords: Boy Scouts dc.subject.keywords: Elementary Astronomy dc.subject.keywords: Greenwich Observatory dc.subject.keywords: Solar System dc.title: Astronomy For Boy Scouts And Others

This work presents a method for determining the accuracy of a source finder algorithm for spectral line radio astronomy data and the Source Finder Accuracy Evaluator (SFAE), a program that implements this method. The accuracy of a source finder is defined in terms of its completeness, reliability, and accuracy of the parameterisation of the sources that were found. These values are calculated by executing the source finder on an image with a known source catalogue, then comparing the output of the source finder to the known catalogue. The intended uses of SFAE include determining the most accurate source finders for use in a survey, determining the types of radio sources a particular source finder is capable of accurately locating, and identifying optimum parameters and areas of improvement for these algorithms. This paper demonstrates a sample of accuracy information that can be obtained through this method, using a simulated ASKAP data cube and the Duchamp source finder.

This thesis describes the design and implementation of several instruments for digitizing and processing analogue astronomical signals collected using radio telescopes. Modern radio telescopes have significant digital signal processing demands that are typically best met using custom processing engines implemented in Field Programmable Gate Arrays. These demands essentially stem from the ever-larger analogue bandwidths that astronomers wish to observe, resulting in large data volumes that need to be processed in real time. We focused on the development of spectrometers for enabling improved pulsar science on the Allen Telescope Array, the Hartebeesthoek Radio Observatory telescope, the Nan\c{c}ay Radio Telescope, and the Parkes Radio Telescope. We also present work that we conducted on the development of real-time pulsar timing instrumentation. All the work described in this thesis was carried out using generic astronomy processing tools and hardware developed by the Center for Astronomy Signal Processing and Electronics Research (CASPER) at the University of California, Berkeley. We successfully deployed to several telescopes instruments that were built solely with CASPER technology, which has helped to validate the approach to developing radio astronomy instruments that CASPER advocates.

Cosmic ray astronomy attempts to identify and study the sources of ultrahigh energy cosmic rays. It is unique in its reliance on charged particles as the information carriers. While no discrete source of ultrahigh energy cosmic rays has been identified so far, a new generation of detectors is acquiring the huge exposure that is needed at the highest energies, where deflection by magnetic fields is minimized and the background from distant sources is eliminated by pion photoproduction. In this paper, we summarize the status of cosmic ray astronomy, describing the detectors and the analysis techniques.

Book Source: Digital Library of India Item 2015.163483 dc.contributor.author: Young, Charles. dc.contributor.other: --- dc.date.accessioned: 2015-07-06T23:01:04Z dc.date.available: 2015-07-06T23:01:04Z dc.date.copyrightexpirydate: 0000-00-00 dc.date.digitalpublicationdate: 0000-00-00 dc.date.citation: 1898 dc.identifier: book\Mathematics\100295 dc.identifier.barcode: 1999990031554 dc.identifier.origpath: /data/upload/0031/559 dc.identifier.copyno: 1 dc.identifier.uri: http://www.new.dli.ernet.in/handle/2015/163483 dc.description.scanningcentre: Pune University dc.description.main: 1 dc.description.tagged: 0 dc.description.totalpages: 42 dc.format.mimetype: application/pdf dc.language.iso: English dc.publisher.digitalrepublisher: Enter Name Of Person Who Scanned dc.publisher: Ginn Amp Company.- London. dc.rights: ---- dc.source.library: ----- dc.subject.classification: Mathematics dc.title: Text Of Astronomy. dc.rights.holder: Ginn Amp Company.- London.

Book Source: Digital Library of India Item 2015.165696 dc.date.accessioned: 2015-07-07T00:00:33Z dc.date.available: 2015-07-07T00:00:33Z dc.date.digitalpublicationdate: 0000-00-00 dc.date.citation: 1907 dc.identifier.barcode: 99999990037883 dc.identifier.origpath: /data/upload/0037/888 dc.identifier.copyno: 1 dc.identifier.uri: http://www.new.dli.ernet.in/handle/2015/165696 dc.description.scanningcentre: IGNCA, Delhi dc.description.main: 1 dc.description.tagged: 0 dc.description.totalpages: 464 dc.format.mimetype: application/pdf dc.language.iso: English dc.publisher.digitalrepublisher: Iiap dc.publisher: Methuen And Co dc.rights: Out_of_copyright dc.source.library: Indian Institute Of Astrophysics dc.title: A History Of Astronomy dc.rights.holder: Methuen And Co

Book Source: Digital Library of India Item 2015.176965 dc.date.accessioned: 2015-07-07T05:04:39Z dc.date.available: 2015-07-07T05:04:39Z dc.date.digitalpublicationdate: 0000-00-00 dc.date.citation: 1908 dc.identifier.barcode: 99999990013062 dc.identifier.origpath: /data/upload/0013/067 dc.identifier.copyno: 1 dc.identifier.uri: http://www.new.dli.ernet.in/handle/2015/176965 dc.description.scanningcentre: IIAp, Bangalore dc.description.main: 1 dc.description.tagged: 0 dc.description.totalpages: 709 dc.format.mimetype: application/pdf dc.language.iso: English dc.publisher.digitalrepublisher: Iiap dc.publisher: J B Lippincott dc.rights: Out_of_copyright dc.source.library: Indian Institute Of Astrophysics dc.title: A Manual Of Spherical And Practical Astronomy Vol I Spherical Astronomy dc.rights.holder: J B Lippincott

This report presents the characteristics and initial outcomes of exiting master's degree recipients in physics and astronomy. The report covers the degree classes of 2006, 2007 and 2008. The status of exiting physics master's varied greatly by the citizenship of the degree recipient. The majority of US citizens entered or remained in the workforce after receiving their degrees, where the majority of non-US citizens continued with graduate study in physics or another field. Of the physics master's in the workforce, over half were employed in the private sector, with a vast majority working in a STEM (Science, Technology, Engineering, and Math) field. (Contains 4 figures and 5 tables.)

Book Source: Digital Library of India Item 2015.13903 dc.contributor.author: F R Moulton dc.date.accessioned: 2015-06-23T22:35:42Z dc.date.available: 2015-06-23T22:35:42Z dc.identifier.barcode: 5010010155043 dc.identifier.origpath: /data1/upload/0009/800 dc.identifier.copyno: 1 dc.identifier.uri: http://www.new.dli.ernet.in/handle/2015/13903 dc.description.scanningcentre: IIIT, Allahabad dc.description.main: 1 dc.description.tagged: 0 dc.description.totalpages: 567 dc.format.mimetype: application/pdf dc.language.iso: English dc.publisher.digitalrepublisher: IIIT, Allahabad dc.publisher: The University Chicago dc.rights: Out_of_copyright dc.source.library: Ram Krishan Mission dc.title: Introduction To Astronomy

Book digitized by Google from the library of Oxford University and uploaded to the Internet Archive by user tpb.

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957 s. :

Book Source: Digital Library of India Item 2015.84042 dc.contributor.author: Hosmer, George L. dc.date.accessioned: 2015-06-30T18:40:00Z dc.date.available: 2015-06-30T18:40:00Z dc.date.citation: 1948 dc.identifier.barcode: 2030020000255 dc.identifier.origpath: /data7/upload/0168/578 dc.identifier.copyno: 1 dc.identifier.uri: http://www.new.dli.ernet.in/handle/2015/84042 dc.description.scannerno: 4 dc.description.scanningcentre: RMSC, IIIT-H dc.description.main: 1 dc.description.tagged: 0 dc.description.totalpages: 388 dc.format.mimetype: application/pdf dc.language.iso: English dc.publisher.digitalrepublisher: Digital Library Of India dc.publisher: John Wiley And Sons,inc. dc.rights: Copyright Permitted dc.source.library: Osmania University dc.subject.classification: Natural Sciences dc.subject.classification: Astronomy. Astrophysics. Space Research.geodesy dc.subject.classification: Astronomical Instruments And Techniques dc.title: Practical Astronomy

Upcoming and current large astronomical survey experiments often seek to constrain cosmological parameters via measurements of subtle effects such as weak lensing, which can only be measured statistically. In these cases, instrumental effects in the image plane CCDs need to be accounted and/or corrected for in measurement algorithms. Otherwise, the systematic errors induced in the measurements might overwhelm the size of the desired effects. Lateral electric fields in the bulk of the CCDs caused by field shaping potentials or space charge build up as the electrons in the image are acquired can cause lateral deflections of the electrons drifting in the CCD bulk. Here, I report on the LSST effort to model these effects on a photon-by-photon basis by the use of a Monte Carlo technique. The eventual goal of this work is to produce a CCD model validated by laboratory data which can then be used to evaluate its effects on weak lensing science.

Abook about Low Frequency Radio Astronomy and GMRT(Giant Meterwave Radio Telescope)

All About Space Astronomy For Beginners – 9th Edition, 2022

Cherenkov telescopes play a major role in the growth of the TeV Astronomy which, in 20 years, has reached the status of an important branch of Astrophysics, because of the observations of the violent, non thermal processes in the extreme band of the electromagnetic spectrum above several tens of GeV up to several tens of TeV. About one hundred extragalactic sources (Active Galactic Nuclei, blazars, and radiogalaxies) and Galactic sources (shell supernovae remnants, pulsar wind nebulae, isolated pulsars, X-ray binaries, and unidentified sources) have been detected so far. In the near future, an ambitious new array, the Cherenkov Compton Telescope (CTA) will substitute the present Cherenkov telescopes arrays. CTA is designed as an array of many (50-100) Cherenkov telescopes operated in stereo mode. CTA will allow to gain a factor of 10 in sensitivity with respect to the present arrays such as H.E.S.S., MAGIC, and VERITAS. Moreover, CTA will connect the TeV to the GeV energy band covered by space missions such as Fermi and AGILE, and will also explore the highest energy region of the electromagnetic spectrum up to several hundreds of TeV.

This review gives an introduction to spectrometers and discusses their use within radio astronomy. While a variety of technologies are introduced, particular emphasis is given to digital systems. Three different types of digital spectrometers are discussed: autocorrelation spectrometers, Fourier transform spectrometers, and polyphase filterbank spectrometers. Given their growing ubiquity and significant advantages, polyphase filterbanks are detailed at length. The relative advantages and disadvantages of different spectrometer technologies are compared and contrasted, and implementation considerations are presented.

Since the early 1990s, the South Pole has been the site of the construction of the world's first under-ice Cherenkov neutrino telescopes - AMANDA and IceCube. The AMANDA detector was completed in 2000, and its successor IceCube, a kilometre scale neutrino detector, began construction in 2005. Completion of IceCube is scheduled for 2011. This paper will give an overview of the history, construction, latest physics results and potential of these detectors.