Results 201 to 210 of about 2,637 (244)
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Symposium - International Astronomical Union, 1994
Meteoroid streams, producing meteor showers if some part of the stream has a node near 1 AU, have complex structures which are only just beginning to be understood. The old simplistic idea of a narrow loop being formed about the orbit of a parent comet with one, or possibly two, terrestrial intersection(s) is now being replaced by the recognition that ...
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Meteoroid streams, producing meteor showers if some part of the stream has a node near 1 AU, have complex structures which are only just beginning to be understood. The old simplistic idea of a narrow loop being formed about the orbit of a parent comet with one, or possibly two, terrestrial intersection(s) is now being replaced by the recognition that ...
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The size of meteoroid constituent grains: Implications for interstellar meteoroids
2002The most widely accepted model for the structure of cometary meteoroids is a dustaball with grains bound together by a more volatile substance [1]. In this paper we estimate the size distribution of dustball grains from meteor flare duration, using image intensified CCD or 1998 Leonid meteors.
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Science, 1968
The meteoroid experiments by five Lunar Orbiters have provided direct measurements in the near-lunar environment of the rate of penetration of 0.025-millimeter beryllium copper by meteoroids. Each experiment used 20 pressurized-cell detectors having a total effective exposed area of 0.186 square meter.
C A, Gurtler, G W, Grew
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The meteoroid experiments by five Lunar Orbiters have provided direct measurements in the near-lunar environment of the rate of penetration of 0.025-millimeter beryllium copper by meteoroids. Each experiment used 20 pressurized-cell detectors having a total effective exposed area of 0.186 square meter.
C A, Gurtler, G W, Grew
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Meteoroids, Meteors and Meteorites
2021AstroEdu, No. 4 (2016)
Smith, Ronan +2 more
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The Quadrantid meteoroid complex
Icarus, 2005The Quadrantids, one of the more active of the annual meteor showers, is unusual for its strong but brief maximum within a broader background of activity. It is also notable for its recent onset, the first observation having been likely made in 1835. Until recently, no parent with a similar orbit had been observed and previous investigators concluded ...
P WIEGERT, P BROWN
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Temperature of an Iron Meteoroid in Space
Science, 1963The solar absorptance and hemispherical emittance of meteoritic iron has been measured from —100° to 300°C for a surface characterized by a 400-grit finish. If it is assumed that 10 percent of the surface is optically black because of holes and cracks, the temperature of an iron meteoroid at the earth's mean distance from the sun would be about 90°C.
C P, Butler, R J, Jenkins
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1983
We have already mentioned repeatedly the great significance of the fragmentation of meteoroids (see Sections 20, 31, and 34). Now let us consider the main observational data attesting to this phenomenon [194]: (1) a high rate of ablation and, as a result, shorter trajectories and higher fadeout altitudes than are to be expected from the ...
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We have already mentioned repeatedly the great significance of the fragmentation of meteoroids (see Sections 20, 31, and 34). Now let us consider the main observational data attesting to this phenomenon [194]: (1) a high rate of ablation and, as a result, shorter trajectories and higher fadeout altitudes than are to be expected from the ...
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Journal of Geophysical Research, 1963
Estimates of the meteoroid penetration of vehicles in space are improved from the author's 1957 values. The meteoritic data are improved by the measurement of luminous efficiency in the artificial meteor experiment of Trailblazer 1 analyzed by McCrosky and Soberman, and by independent determinations from three asteroidal meteors by Cook, Jaechia, and ...
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Estimates of the meteoroid penetration of vehicles in space are improved from the author's 1957 values. The meteoritic data are improved by the measurement of luminous efficiency in the artificial meteor experiment of Trailblazer 1 analyzed by McCrosky and Soberman, and by independent determinations from three asteroidal meteors by Cook, Jaechia, and ...
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Il Nuovo Cimento, 1964
The density of 359 photographic meteors, reduced by Hawkins and Southworth, has been computed with a procedure that uses the height of maximum light and does not require the use of the deceleration. The reliability of the method is discussed. It is shown that neither fragmentation nor other known causes can have a large effect on the results.
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The density of 359 photographic meteors, reduced by Hawkins and Southworth, has been computed with a procedure that uses the height of maximum light and does not require the use of the deceleration. The reliability of the method is discussed. It is shown that neither fragmentation nor other known causes can have a large effect on the results.
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1983
Ablation is defined as a removal of meteoroid mass via phase transformations of the solid surface layer to the liquid or gaseous state. Ablation involves: (a) fusion of the outer layer, followed by spraying of the liquid layer by the oncoming air flow; (b) vaporization of the solid phase or liquid layer, and removal of mass in the ...
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Ablation is defined as a removal of meteoroid mass via phase transformations of the solid surface layer to the liquid or gaseous state. Ablation involves: (a) fusion of the outer layer, followed by spraying of the liquid layer by the oncoming air flow; (b) vaporization of the solid phase or liquid layer, and removal of mass in the ...
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