Author: Martin Dubs

Slow Meteors

by Martin Dubs, Stefano Sposetti, Roger Spinner and Beat Booz Slow meteors are studied with video observations and spectroscopy. A comparison of their orbits and spectra points to a common origin. Although they do not belong to some meteor stream, they deserve to be studied in more detail. The present paper tries to make a first attempt to characterize the common properties of this class of meteors. 1       Introduction In a previous paper (Dubs et al., 2017) we studied two slow meteors with very similar orbits. Having some more observations of slow meteors with a similar spectrum we started looking more closely for slow meteors. As our meteor group has been collecting data for over two years we searched our database of video meteor observations for similar meteors. Using the velocity vg (geocentric velocity corrected for Earth gravitation) as a selection criterion we found a sufficient number in our database for a study of their properties. A connection of these meteors with near Earth asteroids belonging to the Apollo family is postulated. 2       Two case studies M20170327_234523 This meteor was recorded by 12 cameras at 8 stations of the FMA meteor network. Data from 7 stations were used for the trajectory (Figure 1). The velocities v0 calculated by UFO Orbit for the different observers were between 11.0 and 12.8 km/s with an average velocity of 12.56 km/s, resulting in...

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Two slow meteors with spectra

Authors: Martin Dubs, Stefano Sposetti, Roger Spinner and Beat Booz On January 2, 2017 two peculiar meteors (M20170102_001216 and M20170102_015202) were observed by several stations in Switzerland. Both had a long duration, slow velocity, similar brightness and a very similar radiant. As they appeared in a time interval of 100 minutes, a satellite was suspected as a possible origin of these two observations. A closer inspection however showed that this interpretation was incorrect. The two objects were slow meteors.  Spectra were taken from both objects, which were nearly identical. Together this points to a common origin of the two...

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