Zobrazeno 1 - 10
of 45
pro vyhledávání: '"J. L. Africano"'
Publikováno v:
Advances in Space Research. 34:1021-1025
Currently, certain physical properties, such as material type and albedo, of orbital debris are assumed when used to determine the size of the objects. A study to ascertain whether or not the assumed values are valid has begun using reflectance spect
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b9416030e3b3c2afa73ef67fc96a8567
https://doi.org/10.1016/j.asr.2003.02.031
https://doi.org/10.1016/j.asr.2003.02.031
Publikováno v:
Advances in Space Research. 34:1160-1165
A number of optical instruments are involved in making systematic surveys of the geosynchronous Earth orbit (GEO) region. Because of the limited field of view of an optical instrument, it is impossible at any one time to observe objects in all orbit
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::be5285d4ac50a41ced6ff67b00526f27
https://doi.org/10.1016/j.asr.2003.11.014
https://doi.org/10.1016/j.asr.2003.11.014
Publikováno v:
Advances in Space Research. 34:1139-1142
Results will be presented from a new NASA optical survey of objects at geosynchronous orbit (GEO). The goal is to determine the total population of debris objects at GEO to as small a limiting size as possible. This survey uses the University of Mich
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d366442135f29783531c52001342fdd8
https://doi.org/10.1016/j.asr.2003.12.009
https://doi.org/10.1016/j.asr.2003.12.009
Publikováno v:
Advances in Space Research. 34:892-900
The National Aeronautics and Space Administration (NASA) has been making optical observations of the Low Earth Orbit (LEO) and the Geosynchronous Earth Orbit (GEO) orbital debris environment. NASA operates two telescopes located near Cloudcroft, NM t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dabf05b15af956d8954a57cd7d90016d
https://doi.org/10.1016/j.asr.2003.02.022
https://doi.org/10.1016/j.asr.2003.02.022
Autor:
M. K. Mulrooney, T.J. Hebert, E Stansbery, K. Jarvis, Toshiya Hanada, N. Hartsough, J. L. Africano, J. F. Pawlowski, D. T. Hall, Phillip D. Anz-Meador, Mark Matney
Publikováno v:
Advances in Space Research. 28:1283-1290
To gain a better understanding of the LEO and MEO (low and middle earth orbit) optical orbital debris environments, especially in the important, but difficult to track one to ten centimeter size range, NASA Johnson Space Center (JSC) has built a zeni
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::954c5d7df2c31dcb3132639d3c03c4d8
https://doi.org/10.1016/s0273-1177(01)00398-2
https://doi.org/10.1016/s0273-1177(01)00398-2
Autor:
J. L. Africano, P. C. Schmidtke
Publikováno v:
The Astronomical Journal. 141:10
The results for 251 lunar occultation events recorded at Kitt Peak National Observatory are presented, including 20 observations of known or suspected double stars and five measurements of stars with resolved angular diameters.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::90be58ba3142deb0e86f8cbabe161b16
https://doi.org/10.1088/0004-6256/141/1/10
https://doi.org/10.1088/0004-6256/141/1/10
Publikováno v:
Publications of the Astronomical Society of the Pacific. 103:1258
It is found that the orbital changes of the eclipsing cataclysmic variable UX Ursae Majoris are aperiodic. This eliminates apsidal motion and the revolution of the eclipsing system around a third body as feasible explanations of the period variations
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f094c3533af563786dba0d83e129bdbd
https://doi.org/10.1086/132945
https://doi.org/10.1086/132945
Publikováno v:
The Astronomical Journal. 102:1176
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b6939a9bb5e2cda9d797a50be991cd8a
https://doi.org/10.1086/115944
https://doi.org/10.1086/115944
Autor:
William E. Allen, David Skillman, Galilean Satellite Observers, Thomas Langhans, C. Blanco, Lawrence H. Wasserman, Iain Coulson, David Rettig, John Westfall, Mitaka Shi, William M. Sinton, Peter V. Birch, Fred A. Franklin, Jan-Erik Solheim, James Walters, Mitsuru Soma, Kaare Aksnes, Jay D. Goguen, Robert C. Jones, Clive Rowe, Robert L. Marcialis, Tsuko Nakamura, J. L. Africano, William G. Weller, Robert L. Millis
Publikováno v:
The Astronomical Journal. 102:806
This paper derives midtimes and relative satellite positions from nearly 200 light curves of mutual eclipses and occultations of the Galilean satellites that occurred in 1985. It is shown that, at least for observations of the highest quality, the st
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bef001a0c597913b452d9216fbf95ae0
https://doi.org/10.1086/115912
https://doi.org/10.1086/115912
Publikováno v:
International Astronomical Union Colloquium. 112:19-19
We report on the results of a program to measure the brightness of the night sky at the Kitt Peak National Observatory during the recent minimum in the solar cycle, a time noted for the darkest nighttime skies. We have measured sky brightness using a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d2356f2852261ad71c30ef1d7fc10cd2
https://doi.org/10.1017/s0252921100003602
https://doi.org/10.1017/s0252921100003602