| Assessing Accuracy in Varying LIDAR Data Point Densities in Digital Elevation Maps |
01-Sep-2008 |
99 pages |
| Authors:
Brian C Anderson; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
 | This thesis discusses the production of Digital Elevation Maps (DEM) using varying density of data points from a Lidar (Laser or Light Detection And Ranging) collection. Additionally, this thesis contains information on the multiple space missions that use laser altimetry or Lidar to gather data about planet earth, the moon, asteroids, Mars and Mercury. The thesis covers the accuracy of different amounts of data used when generating a DEM in ... |
|
| Micrometeoroid and Orbital Debris Environments for the International Space Station |
15 DEC 2007 |
12 pages |
| Authors:
T. E. Gallini; J. A. Hackwell; D. C. Marin; Michael Zambran; Glenn E. Peterson; David K. Lynch; AEROSPACE CORP EL SEGUNDO CA
|
| Baseline micrometeoroid and orbital debris fluence estimates for spacecraft in low Earth orbit (LEO) are provided. For these calculations, an orbit similar to that of the International Space Station (ISS) is used. |
|
| Prospects for Improving the Masses of Minor Planets |
01-Sep-2007 |
5 pages |
| Authors:
J L Hilton; NAVAL OBSERVATORY WASHINGTON DC
|
| Among the largest uncertainties in the fundamental constants of astronomy are the masses of the minor planets. They constitute the largest source of uncertainty in the ephemerides of the inner planets. Few asteroid masses are known with an uncertainty of better than about 50%. With a few exceptions, minor planet masses are determined by observing the perturbation of a massive minor planet on a smaller one during a close encounter. ... |
|
| Novel and Efficient Synthesis of the Promising Drug Candidate Discodermolide |
FEB 2007 |
7 pages |
| Authors:
Kathyln A. Parker; STATE UNIV OF NEW YORK AT STONY BROOK
|
| During the first year of this grant, we have demonstrated proof of principle for both of the premises on which the project is built. We have shown that a macrolide that is available in large quantities can be degraded to provide a building block for a valueadded polyketide, specifically discodermolide. Because of difficulties with the original scheme, we applied Corey's cis diene synthesis in this preparation; this proved to be ... |
|
| Fuel Optimal Low Thrust Trajectories for an Asteroid Sample Return Mission |
MAR 2005 |
75 pages |
| Authors:
Jack W. Rust; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This thesis explores how an Asteroid Sample Return Mission might make use of solar electric propulsion to send a spacecraft on a journey to the asteroid 1989ML and back. It examines different trajectories that can be used to get an asteroid sample return or similar spacecraft to an interplanetary destination and back in the most fuel-efficient manner. While current plans call for keeping such a spacecraft on the asteroid performing ... |
|
| Echinoderm Adhesive Secretions: From Experimental Characterization to Biotechnological Applications |
2004 |
26 pages |
| Authors:
Patrick Flammang; Romana Santos; Delphine Haesaerts; MONS-HAINAUT UNIV (BELGIUM)
|
| Adhesion is a way of life in echinoderms. Indeed, all the species belonging to this phylum use adhesive secretions extensively for various vital function. According to the species or to the developmental stage considered, different adhesive systems may & recognized. (1) The tube feet or podia are organs involved in attachment to the substratum, locomotion, feeding or burrowing. Their temporary adhesion relies on a duo-gland adhesive system resorting to both ... |
|
| Proceedings of the 2001 Space Control Conference (19th Annual) Held in Lincoln Laboratory, Hanscom AFB, MA on 3-5 April 2001 (CD-ROM) |
APR 2001 |
|
| Authors:
S. E. Andrews; MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
|
 | ELECTRONIC FILE CHARACTERISTICS: 76 files; text, video and software; Adobe Acrobat PDF, Audio-Video Interleave (AVI), QuickTime Movie (MOV). PHYSICAL DESCRIPTION: 1 computer laser optical disc (CD-ROM); 4 3/4 in.; 96.7 MB. SYSTEMS DETAIL NOTE: Requires Adobe Acrobat ver. 4.05 and QT 5.02 (included on this CD-ROM). ABSTRACT: The nineteenth Annual Space Control Conference was held on 3, 4 and 5 April 2001. ESC acts as administrative sponsor of the event ... |
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| CSIMPS: A Program for Deriving Asteroid Diameters and Albedos from IRAS Data Software |
MAR 2001 |
364 pages |
| Authors:
Meg A. Noah; Edward F. Tedesco; Paul V. Noah; MISSION RESEARCH CORP NASHUA NH
|
| The CSIMPS effort extends the work of the IMPS asteroid albedo and diameter determination by increasing the number of asteroids sampled. The IMPS processing effort was performed on 486 computer systems and was limited by disk size and memory. The CSIMPS effort removed these limitations and took advantage of more efficient processing. This report documents the software used to determine the asteroid albedos and diameters in CSIMPS. |
|
| Celestial Background Scene Descriptor: Final Report |
FEB 2001 |
89 pages |
| Authors:
P. V. Noah; M. A. Noah; MISSION RESEARCH CORP SANTA BARBARA CA
|
| This report summarizes the results of the Celestial Background Scene Descriptor (CBSD) program. The goal of the CBSD program is to design, build, and validate a suite of FORTRAN codes that simulates the flux from the celestial background, in support of DoD developed optical and infrared sensor systems, realistic scenario generation, and the development of clutter removal algorithms. Components of the CBSD suite are CBSKY4 - stellar point sources (both ... |
|
| CBSD: The Celestial Background Scene Descriptor Version 4.0 - Installation and User's Manual |
FEB 2001 |
50 pages |
| Authors:
Paul V. Noah; Meg A. Noah; AIR FORCE RESEARCH LAB HANSCOM AFB MA
|
| This document is a User's Manual for two of the Celestial Background Scene Descriptor (CBSD) models; CBZODY6; the zodiacal light model; and CBSKY4, the point source stellar component. The codes provide flux and positional information for stars and zodiacal dust covering the 0.2 to 30 micrometer range. The CBZODY6 from 0.2 to 30 micrometers and the CBSKY4 from 2 to 30 micrometers can use external filter response functions of any ... |
|
| New Research in Sky Surveillance - Interpretation of Low-Luminosity Objects |
15 DEC 2000 |
17 pages |
| Authors:
Robert S. McMillan; STEWARD OBSERVATORY TUCSON AZ
|
| Spacewatch is an exploration of the whole solar system for minor planets and comets, from the inner solar system to beyond Neptune's orbit. During this report period, Spacewatch discovered 23 Earth-approachers (EAs), 9, 910 main belt asteroids (MBAs), a new satellite of Jupiter, 2 comets, 9 Centaurs or scattered-disk objects, and 6 Trans-Neptunian Objects (TNOs). Spacewatch made a new estimate of the number of km-sized EAs, from which it has ... |
|
| Using Lasers in Space: Laser Orbital Debris Removal and Asteroid Deflection |
DEC 2000 |
35 pages |
| Authors:
Jonathan W. Campbell; AIR UNIV PRESS MAXWELL AFB AL
|
| Orbital debris in tow-Earth orbit ranging in size from 1 to 10 centimeters (cm) in diameter, poses a significant problem for space vehicles. While this debris can he detected, it cannot he tracked with sufficient reliability to permit spacecraft to avoid these objects. Such debris can cause catastrophic damage even to a shielded spacecraft. Given the technological advances associated with adaptive optics, a ground- based pulsed laser could ablate or ... |
|
| Operation of the University of Hawaii 2.2M Telescope on Mauna Kea |
26 JAN 2000 |
7 pages |
| Authors:
Robert McLaren; Donald Hall; HAWAII UNIV HONOLULU INST FOR ASTRONOMY
|
| During this period the operation of the University of Hawaii's 2.2M telescope was partially funded by this grant. The original term of this grant was one year. Most of the grant funds were expended during this year. Subsequently a one year extension was approved. Over the resulting 2 year period, this grant provided approximately 6% of the operating budget of the telescope. The fraction ... |
|
| Planetary Defense: Eliminating the Giggle Factor |
2000 |
26 pages |
| Authors:
Martin E. France; NATIONAL DEFENSE UNIV WASHINGTON DC
|
| The Giggle Factor (GF). Mention Planetary Defense and you'll soon understand. Even without invoking the sinister vision of alien beings arriving to enslave or destroy humanity, the eyebrows of serious and senior members of the national defense and scientific communities go askew when the subject is broached, whether at cocktail parties or congressional budget hearings. Even the most ardent supporters of defending the Earth from cataclysmic cometary or asteroidal impacts ... |
|
| Giant Comets, Evolution and Civilization |
1998 |
|
| Authors:
S. V. Clube; F. Hoyle; W. M. Napier; N. C. Wickramasinghe; OXFORD UNIV (UNITED KINGDOM) DEPT OF PHYSICS
|
| Climatic cycles, ice epochs, mass extinctions and other global disturbances may be attributed to episodes of bombardment by giant comets. Such bodies now in chaotic orbits beyond Jupiter present the most serious current celestial hazard. A point at issue is the greater complexity of the cometary as opposed to the asteroidal hazard, as well as its more pervasive effects. |
|
| A Patched-Conic Analysis for Optimally Deflecting Earth-Crossing Asteroids |
DEC 97 |
102 pages |
| Authors:
Scott D. V. Porter; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The threat of collision between an asteroid or a comet and the Earth has been well documented. Mitigation of such a threat can be accomplished by destruction of the threat or by perturbing the threat object into a safe orbit. Following a summary of proposed mitigation techniques, this thesis investigates the impulse required to safely perturb a threatening Earth Crossing Asteroid (ECA). While previously published analysis included only two body ... |
|
| Students in Advanced Research for Sky Surveillance |
09 NOV 97 |
5 pages |
| Authors:
Tom Gehrels; ARIZONA UNIV TUCSON LUNAR AND PLANETARY LAB
|
| Spacewatch program discovers small bodies (asteroids and comets) in the solar system and analyzes their distributions with orbital parameters and absolute magnitude. Scanning of the night sky is conducted 18-20 nights per month with tbe 0.9-m Spacewatch Telescope on Kitt Peak. About 1200. to 2000 sqare degrees of sky are searched each year to a V magnitude level of 21.3. Spacewatch discoveries support studies of the evolution of the Centaur, ... |
|
| New Research in Sky Surveillance: Interpretation of Low-Luminosity Objects |
07 NOV 97 |
8 pages |
| Authors:
Tom Gehrels; ARIZONA UNIV TUCSON LUNAR AND PLANETARY LAB
|
| The Spacewatch program discovers small bodies (asteroids and comets) in the solar system and analyzes their distributions with orbital parameters and absolute magnitude. Scanning of the night sky is conducted with a charged- coupled device (CCD) imaging detector. About 1200 to 2000 square degrees of sky are searched each year to a V magnitude limit of 21.5 Spacewatch discoveries support studies of the Centaur, Trojan, Main-Belt. and Earth-approaching asteroid populations. ... |
|
| Analysis of Tethers in Sampling Near Earth Objects |
JUN 1997 |
133 pages |
| Authors:
John W. Wong; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
|
| This study investigated the feasibility of a SAIC proposal to sample Near Earth Objects (NEOs) from an orbiting spacecraft using a tethered landing device. The parameters for suitable targets were derived from an analysis of a proposed point design as applied to current knowledge of NEOs. Tether strength and lifetime for the point design were also assessed. First order modeling of tether dynamics showed that deployment and attachment to a ... |
|
| Report on Space Surveillance, Asteroids and Comets, and Space Debris, Volume 1: Space Surveillance |
JUN 1997 |
67 pages |
| Authors:
SCIENTIFIC ADVISORY BOARD (AIR FORCE) WASHINGTON DC
|
| This study of Space Surveillance, Asteroids and Comets, and Space Debris is a study that is separable into three parts, each of which is sufficiently complex to be a study of its own. It was requested by Commander, Air Force Space Command, and approved by the Secretary and Chief of Staff of the Air Force. Because increased knowledge of asteroids and comets as well as debris depends on an enhanced ... |
|
| Space Surveillance, Asteroids and Comets, and Space Debris. Volume 3: Space Debris Summary Report |
JUN 1997 |
33 pages |
| Authors:
R. Naka; G. H. Canavan; R. A. Clinton; O. P. Judd; A. F. Pensa; SCIENTIFIC ADVISORY BOARD (AIR FORCE) WASHINGTON DC
|
| This Study was produced by the Air Force Scientific Advisory Board (SAB). It was requested by the Commander Air Force Space Command and approved by the Secretary and Chief of Staff of the Air Force. It covers three topics, each of sufficient depth to be a study of its own: Space Surveillance, Asteroid and Comet Impact Warning for Earth, and Space Debris. NASA personnel predicted in 1978 that collisional cascading ... |
|
| Space Surveillance, Asteroids and Comets, and Space Debris. Volume 1: Space Surveillance |
JUN 1997 |
68 pages |
| Authors:
F. R. Naka; G. H. Canavan; R. A. Clinton; O. P. Judd; A. F. Pensa; SCIENTIFIC ADVISORY BOARD (AIR FORCE) WASHINGTON DC
|
| This Study was produced by the Air Force Scientific Advisory Board. It was requested by the Commander Air Force Space Command and approved by the Secretary and Chief of Staff of the Air Force. It covers three topics, each of sufficient depth to be study of its own: Space Surveillance, Asteroid and Comet Impact Warning for Earth, and Space Debris. Space Surveillance is the unifying theme. Space Surveillance is a ... |
|
| Planetary Defense: Catastrophic Health Insurance for Planet Earth |
OCT 1996 |
78 pages |
| Authors:
John M. Urias; Iole M. DeAngelis; Donald A. Ahern; Jack S. Caszatt; George W. Fenimore III; AIR COMMAND AND STAFF COLL MAXWELL AFB AL
|
| Concern exists among an increasing number of scientists throughout the world regarding the possibility of a catastrophic event caused by an impact of a large earth crossing object (ECO) on the Earth Moon System (EMS), be it an asteroid or comet. Such events, although rare for large objects (greater than 1 kilometer diameter), are not unprecedented. collectively as a global community, no current viable capability exists to defend the EMS ... |
|
| The Hazard to Civilization from Fireballs and Comets |
04 JUN 1996 |
5 pages |
| Authors:
P. A. Charles; OXFORD UNIV (UNITED KINGDOM) DEPT OF ASTROPHYSICS
|
| Asteroids which pass close to the Earth have been fully recognized by mankind for only about 20 years. The present report, then, is concerned with those other celestial bodies recorded by mankind since the dawn of civilization which either miss or impinge upon the Earth and which have also been despised. Now known respectively as comets (>1 kilometer in size) and meteoroids (<10 meters in size), it is the fireballs ... |
|
| Narrative Report on the Hazard to Civilization Due to Fireballs and Comets |
1996 |
26 pages |
| Authors:
S. V. Clube; OXFORD UNIV (UNITED KINGDOM) DEPT OF PHYSICS
|
| The 100,000 year average interval between asteroid strikes (Chapman & Morrison 1994) first became apparent during the 1970s. Another discovery of considerable moment about this time was that of object Chiron. Considered to be a "giant comet" and found to be moving in a chaotic orbit beyond Saturn close to the ecliptic (Kowal l979,Oikawa & Everhart 1978), the possibility of its future transfer to a more stable sub-Jovian orbit capable ... |
|
| Study of Capabilities of Ground Based Sensors for Detection of Small Technogenic Particles and Asteroids |
MAY 94 |
59 pages |
| Authors:
Grigoriy M. Chernyavskly; RUSSIAN ACADEMY OF SCIENCES MOSCOW CENTRE FOR PROGRAM STUDIES
|
| The report discusses the problem of detection of small size space debris and asteroids. Analysis of existing Russian ground based and space based sensors is provided us to perform the assigned objectives are selected: a cm- band BMD radar, dm band BMD radar, an experimental mm/cm band radar complex, a mobile multipurpose telescope, visible/UV band on board space sensors (one is on orbit now and the second is being prepared ... |
|
| Erice International Seminars on Planetary Emergencies, 17th Workshop: The Collision of an Asteroid or Comet with the Earth Held in Erice, Italy on 28 April-4 May 1993 |
04 MAY 93 |
13 pages |
| Authors:
ETTORE MAJORANA CENTRE FOR SCIENTIFIC CULTURE ERICE (ITALY)
|
|
| CBSD: The Celestial Background Scene Descriptor. |
JAN 1993 |
|
| Authors:
J. P. Kennealy; P. V. Noah; E. F. Tedesco; R. M. Cutri; S. F. Dermott; MISSION RESEARCH CORP NASHUA NH
|
| This report documents the Celestial Background Scene Descriptor (CBSD) program which is a suite of models to simulate the radiance of astronomical sources. The models simulate the contribution of the celestial background in the wavelength regime 2 to 30 micrometers with a positional accuray of 2 arcseconds. The output of the models are tables and images suitable for use in sensor simulation. The CBAMP model calculates the thermal radiance and ... |
|
| JPRS Report, Central Eurasia Aviation & Cosmonautics No 5-6 May-June 1992 |
09 DEC 1992 |
28 pages |
| Authors:
JOINT PUBLICATIONS RESEARCH SERVICE ARLINGTON VA
|
| This Report contains articles on Central Eurasia AVIATION AND COSMONAUTICS. The articles were taken from the translations of selected articles in the Russian-language monthly journal AVIATSIYA I KOSMONAVTIKA published in Moscow. |
|
| IRAS Minor Planet Survey. |
DEC 1992 |
|
| Authors:
Edward F. Tedesco; Glenn J. Veeder; John W. Fowler; Joseph R. Chillemi; JET PROPULSION LAB PASADENA CA
|
| This report documents the program and data used to identify known asteroids observed by the Infrared Astronomical Satellite (IRAS) and to compute albedos and diameters from their IRAS fluxes. It also presents listings of the results obtained. These results supplant those in the IRAS Asteroid and Comet Survey, 1986. The present version used new and improved asteroid orbital elements for 4,679 numbered asteroids and 2,632 additional asteroids for which at ... |
|
| SPACECAST 2020, Volume 1 |
JUN 92 |
486 pages |
| Authors:
Jay W. Kelley; AIR UNIV MAXWELL AFB AL
|
| SPACECAST 2020 was a Chief of Staff of the Air Force (CSAF)-directed space study, challenged to identify and conceptually develop high-leverage space technologies and systems that will best support the warfighter in the twenty- first century. The study produced a series of white naners which have been assembled into clusters of concern for future space capabilities. Volume I consists of 11 unclassified white papers: Leveraging the Infosphere: Surveillance and Reconnaissance ... |
|
| Surveying with Charge Coupled Devices |
OCT 91 |
65 pages |
| Authors:
Thomas Gehrels; ARIZONA UNIV TUCSON
|
| The 0.91-m 'Spacewatch Telescope' of the Steward Observatory of the University of Arizona on Kitt Peak is dedicated to scanning with charge-coupled devices (CCDs) during the dark half of the month. We explored six modes of using CCDs for searches of gamma ray bursters, debris in geosynchronous space, satellites of asteroids, brown dwarf stars, the tenth planet, comets, cometesimals, and various types of asteroids. In the process, we gained experience ... |
|
| A Characterization of the Hot Infrared Background: The Infrared Cirrus, Zodiacal Dust Bands, and Solar System Dust Trails |
01 APR 91 |
238 pages |
| Authors:
F. Low; M. Sykes; R. Cutri; STEWARD OBSERVATORY TUCSON AZ
|
| Utilizing data from the Infrared Astronomical Satellite, we have completed an investigation into the nature and properties of the principal components of the hot thermal background. These include the warm infrared cirrus, zodiacal dust bands, and cometary dust trails. A large set of high galactic latitude IRAS Skyflux maps have been cleaned using an image-space processor which we have developed. Using these enhanced infrared maps, 44 fields have been identified ... |
|
| CBSD Version II Component Models of the IR Celestial Background |
07 DEC 90 |
129 pages |
| Authors:
John P. Kennealy; Gene A. Glaudell; MISSION RESEARCH CORP NASHUA NH
|
| CBSD Version II addresses the development of algorithms and software which implement realistic models of all the primary celestial background phenomenologies, including solar system, galactic, and extra-galactic features. During 1990, the CBSD program developed and refined IR scene generation models for the zodiacal emission, thermal emission from asteroids and planets, and the galactic point source background. Chapters in this report are devoted to each of those areas. Ongoing extensions to ... |
|
| Infrared Observations of the Solar System in Support of Large Aperture Infrared Telescope (LARITS): Calibration |
02 MAY 90 |
22 pages |
| Authors:
Richard W. Shorthill; UTAH UNIV SALT LAKE CITY DEPT OF MECHANICAL ENGINEERING
|
| The Purpose of this project was to improve the infrared calibration base for infrared detectors. Groundbased infrared measurements of solid-surfaced planetary bodies, such as asteroids, are being used for the calibration of spacecraft detectors. A limitation has been the relatively poor theoretical understanding of thermal emission from these objects. The goal was to: (1) develop a database of sources and, (2) improve or modify the thermal models for these sources ... |
|
| Zodiacal Dust Bands: Their Relation to Asteroid Families |
25 SEP 89 |
|
| Authors:
Mark V. Sykes; STEWARD OBSERVATORY TUCSON ARIZ
|
| A mathematical model of the spatial distribution of orbitally evolve d collisional debris is developed which reproduces the zodiacal dust band phenomenon. The resultant torus has maxima in particle density at heliocentric latitudes near the mean proper orbital inclinations of its constituent particles, and near the locus of perihelia and aphelia of the particle orbits. These perihelion and aphelion band pairs are fund to have latitudinal and radial separations which ... |
|
| Dust Bands in the Asteroid Belt |
08 SEP 89 |
144 pages |
| Authors:
M. Sykes; R. Greenberg; S. Dermott; P. Nicholson; J. Burns; STEWARD OBSERVATORY TUCSON ARIZ
|
| The Infrared Astronomical Satellite (IRAS) discovered three bands of dust: one above, below, and approximately in the plane of the ecliptic. These bands are located in the asteroid belt and are believed to arise from collisional activity. Debris from an asteroid collision, over time, fills a torus having peaks in particle number density near its inner and outer corners, corresponding to the locus of perihelia and aphelia, respectively. As a ... |
|
| Astronomical Observations by Speckle Interferometry |
12 JUN 86 |
|
| Authors:
Harold A. . McAlister; GEORGIA STATE UNIV ATLANTA DEPT OF PHYSICS AND ASTRONOMY
|
| Speckle interferometry is a method permitting the extraction of spatial information from two dimensional images at scales down to the diffraction limit of the telescope in spite of severe blurring introduced by atmospheric turbulence. With existing large telescopes, speckle techniques thus permit resolution at spatial scales of 0.025 arcseconds rather than the 1 to 2 arcseconds associated with classical techniques. These methods are also characterized by enhanced measurement accuracy of ... |
|
| An Analysis of the Accessibility of Earth-Approaching Asteroids |
DEC 85 |
|
| Authors:
Philip W. Somers; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
|
| The purpose of this thesis is to analyze the accessibility of Earth- approaching asteroids using a computer program that was practical to run on a microcomputer. This analysis employs techniques that can easily be adapted to find optimal trajectories for a variety of orbital intercept applications. The mathematical analysis was adapted from recently developed algorithms that were designed to run on main frame computers using extensive software libraries and data ... |
|
| Speckle Image Reconstruction |
01 APR 85 |
|
| Authors:
P. A. Strittmatter; E. K. Hege; STEWARD OBSERVATORY TUCSON ARIZ
|
| This report contains results obtained from observations using the University of Arizona 2.3 meter telescope, the Kitt Peak National Observatory 4 meter telescope and the multiple mirror telescope. Work Done included: High Resolution Imaging Potential of MMT; Earth Satellite Observations; Asteroid/ Planetary Satellite Measurements; and Image Reconstruction Experiments; Scientific Accomplishments pertained to; Asteroid/Planetary Science; Red Supergiants - Limb Darkening and Extended Atmosphere; Binary Stars; Active Galactic Nuclei; and QSO Images. ... |
|
| Speckle Image Reconstruction. Appendix 2 |
01 APR 85 |
|
| Authors:
P. A. Strittmatter; E. K. Hege; STEWARD OBSERVATORY TUCSON ARIZ
|
| Partial contents: Size Measurement of a Geosynchronous Satellite Using the MMT (Multiple Mirror Telescope); Speckle Interferometry of Asteroids; High-Speed Digital Signal Processing for Speckle Interferometry; Seeing Calibration of Optical Astronomical Speckle Interferometric Data; Seeing Studies for Speckle Holographic Imaging; A self Calibrating Shift-and-Add Technique for Speckle Imaging; Physical Diameter and Images of Alpha Orionis; Image Reconstruction from Astronomical Speckle Interferometry; Recovery of Binary Star Orientation and Relative Intensity--A comparison of ... |
|
| Motion Planning in the Presence of Moving Obstacles |
85 |
30 pages |
| Authors:
John H. Reif; Micha Sharir; HARVARD UNIV CAMBRIDGE MA CENTER FOR RESEARCH IN COMPUTER TECHNOLOGY
|
| This paper investigates the computational complexity of planning the motion of a body B in 2-D or 3-D space, so as to avoid collision with moving obstacles of known, easily computed, trajectories. Dynamic movement problems are of fundamental importance to robotics, but their computational complexity has not previously been investigated. We provide evidence that the 3-D dynamic movement problem is intractable even if B has only a constant number of ... |
|
| Defense Applications of Near-Earth Resources |
AUG 1983 |
51 pages |
| Authors:
S. Nozette; CALIFORNIA SPACE INST LA JOLLA
|
|
| Artificial Satellites, Minor Planets, and the ETS. |
26 JUN 1980 |
|
| Authors:
David E. Beatty; John M. Sorvari; Laurence G. Taff; MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
|
| This report summarizes the successful modification of Lincoln Laboratory's Experimental Test System hardware and software for the detection and discrimination of asteroids rather than artificial satellites. The minor planets are found by exploiting their proper motion and the limiting magnitude is roughly brightness magnitude = 17.5. The complete observing cycle, including the 2 - 3 sec. measurement of position, requires about four minutes at present. The commonality of asteroids and ... |
|
| Structure of the Asteroid Belt (Struktura Poyasa Asteroidov), |
22 AUG 1977 |
|
| Authors:
G. A. Chebotarev; V. A. Shor; NAVAL INTELLIGENCE SUPPORT CENTER WASHINGTON D C TRANSLATION DIV
|
| This paper reviews the present-day data on the spacial distribution of orbits and the motion of characteristic objects in the asteroid belt. The distribution of asteroids as a function of their stellar magnitudes, radii, and masses is also considered. Particular attention is devoted to the influence of the selection effects on the statistics and to explanation of the characteristics of the distribution in terms of the gravitational theory and collisional ... |
|
| Astronomic Circular No. 605, 1971, |
MAR 1972 |
|
| Authors:
V. V. Terentev; I. E. Zalkalne; Yu. N. Lipskii; Zh. F. Rodionova; AERONAUTICAL CHART AND INFORMATION CENTER ST LOUIS MO TECHNICAL TRANSLATION SECTION
|
| The report contains a translation of the following titles, contained in Astronomic Circular No. 605; On the problem of small eccentricities in the theory of satellite motion; On comet and minor planets collision; and, Hypsometry of the moon's surface. (Author) |
|
| Astrophysical Observations of Polarized Stars and Nebulae. |
AUG 1971 |
|
| Authors:
William Liller; HARVARD COLL OBSERVATORY CAMBRIDGE MASS
|
| In the last 39 months, numerous measurements of the degree of optical polarization of the light emitted by a wide variety of astronomical sources have been made. These data have led to a better understanding of the surface properties of asteroids and satellites, of the nature of the interstellar grains, and the characteristics of planetary nebulae, quasars, and pulsars. The results have been extended by observations of other types, primarily ... |
|
| RADAR Interviews Concerning the Problems of Contemporary Astrodynamics. |
18 NOV 1968 |
|
| Authors:
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH
|
| Artificial earth satellites involve a number of problems which do not occur in relation to natural celestial bodies, such as passage through the Earth's atmosphere, calculation of courses, and intersection of an astronautical vehicle with a planet in space. The Institute of Theoretical Astronomy was founded in 1919. Its chief responsibility is compiling the vital astronomic yearbooks, but it also studies the 2,000 asteroids revolving between the orbits of Mars ... |
|
| PERIODIC TROJAN ORBITS FOR THE RESONANCE 1/12, |
NOV 1968 |
|
| Authors:
Andre Deprit; Eugene Rabe; BOEING SCIENTIFIC RESEARCH LABS SEATTLE WASH MATHEMATICS RESEARCH LAB
|
| A bridge of periodic orbits consisting of a lane of stable orbits and a lane of unstable ones connects the two short period orbits around L sub 4 whose rotation number is equal to 12. (Author) |
|
| RESEARCH IN MEASUREMENT OF RATIOS OF POLARIZATION TO ABSORPTION FOR STARS ALONG THE MILKY WAY. |
SEP 1968 |
|
| Authors:
William Liller; HARVARD COLL OBSERVATORY CAMBRIDGE MASS
|
| Following a study of existing stellar polarimeters, there emerged the optical, mechanical and electronic design of an eight color, two channel, d.c. integrating polarimeter to be used primarily at the Cassegrain focus of the 61-inch reflector at Harvard University's G. R. Agassiz Station. The instrument was assembled and tested at the Harvard College Observatory and has been in full operation for nearly one year. Its performance has proven excellent, and ... |
|
Reports by Keyword(s)
ASTEROIDS
