Meteor44 Video Meteor Photometry |
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Authors: | Wesley R Swift Robert M Suggs William J Cooke |
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Institution: | (1) Raytheon/MSFC Group, Space Environments Team, EV13, Marshall Space Flight Center, Huntsville, AL 35812, USA;(2) NASA, Space Environments Team, EV13, Marshall Space Flight Center, Huntsville, AL 35812, USA |
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Abstract: | Meteor44 is a software system developed at MSFC for the calibration and analysis of video meteor data. The photometric range
of the (8 bit) video data is extended from a visual magnitude range of from 8 to 3 to from 8 to −8 for both meteors and stellar
images using saturation compensation. Camera and lens specific saturation compensation coefficients are derived from artificial
variable star laboratory measurements. Saturation compensation significantly increases the number of meteors with measured
intensity and improves the estimation of meteoroid mass distribution. Astrometry is automated to determine each image's plate
coefficient using appropriate star catalogs. The images are simultaneously intensity calibrated from the contained stars to
determine the photon sensitivity and the saturation level referenced above the atmosphere. The camera's spectral response
is used to compensate for stellar color index and typical meteor spectra in order to report meteor light curves in traditional
visual magnitude units. Recent efforts include improved camera calibration procedures and long focal length "streak" meteor
photometry. Meteor44 has been used to analyze data from the 2001, 2002 and 2003 MSFC Leonid observational campaigns as well
as several lesser showers. |
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Keywords: | Meteor video photometry leonids video calibration |
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