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  • 1
    Electronic Resource
    Electronic Resource
    An asteroid breakup 160 Myr ago as the probable source of the K/T impactor (2007)
    [s.l.] : Nature Publishing Group
    Nature 449 (2007), S. 48-53 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The terrestrial and lunar cratering rate is often assumed to have been nearly constant over the past 3 Gyr. Different lines of evidence, however, suggest that the impact flux from kilometre-sized bodies increased by at least a factor of two over the long-term average during the past ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature06070
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  • 2
    Electronic Resource
    Electronic Resource
    A late Miocene dust shower from the break-up of an asteroid in the main belt (2006)
    [s.l.] : Nature Publishing Group
    Nature 439 (2006), S. 295-297 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Throughout the history of the Solar System, Earth has been bombarded by interplanetary dust particles (IDPs), which are asteroid and comet fragments of diameter ∼1–1,000 µm. The IDP flux is believed to be in quasi-steady state: particles created by episodic main belt collisions or ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature04391
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  • 3
    Electronic Resource
    Electronic Resource
    The recent breakup of an asteroid in the main-belt region (2002)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 417 (2002), S. 720-771 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The present population of asteroids in the main belt is largely the result of many past collisions. Ideally, the asteroid fragments resulting from each impact event could help us understand the large-scale collisions that shaped the planets during early epochs. Most known asteroid fragment ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature00789
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  • 4
    Electronic Resource
    Electronic Resource
    An age–colour relationship for main-belt S-complex asteroids (2004)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 429 (2004), S. 275-277 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Asteroid collisions in the main belt eject fragments that may eventually land on Earth as meteorites. It has therefore been a long-standing puzzle in planetary science that laboratory spectra of the most populous class of meteorite (ordinary chondrites, OC) do not match the remotely observed ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature02578
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  • 5
    Electronic Resource
    Electronic Resource
    The vector alignments of asteroid spins by thermal torques (2003)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 425 (2003), S. 147-151 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Collisions have been thought to be the dominant process altering asteroid rotations, but recent observations of the Koronis family of asteroids suggest that this may be incorrect. This group of asteroids was formed in a catastrophic collision several billion years ago; in the intervening period ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature01948
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  • 6
    Electronic Resource
    Electronic Resource
    Iron meteorites as remnants of planetesimals formed in the terrestrial planet region (2006)
    [s.l.] : Nature Publishing Group
    Nature 439 (2006), S. 821-824 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Iron meteorites are core fragments from differentiated and subsequently disrupted planetesimals. The parent bodies are usually assumed to have formed in the main asteroid belt, which is the source of most meteorites. Observational evidence, however, does not indicate that differentiated bodies ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature04536
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  • 7
    Electronic Resource
    Electronic Resource
    Frequency modified fourier transform and its application to asteroids (1996)
    Springer
    Celestial mechanics and dynamical astronomy 65 (1996), S. 137-148 
    Details
    ISSN: 1572-9478
    Keywords: Asteroids ; Chaos ; Fourier Transform
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Recently a method has been suggested to analyze the chaotic behaviour of a conservative dynamical system by numerical analysis of the fundamental frequencies. Frequencies and amplitudes are determined step by step. As the frequencies are not generally orthogonal, a Gramm-Schmidt orthogonalization is made and for each new frequency the old amplitudes of previously determined frequencies are corrected. For a chaotic trajectory variations of the frequencies and amplitudes determined over different time periods are expected. The change of frequencies in such a calculation is a measure of the chaoticity of the trajectory. While amplitudes are corrected, the frequencies (once determined) are constant. We suggest here simple linear corrections of frequencies for the effect of other close frequencies. The improvement of frequency determination is demonstrated on a model case. This method is applied to the first fifty numbered asteroids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00048443
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  • 8
    Electronic Resource
    Electronic Resource
    Refinement of the geopotential scale factorR 0 on (1994)
    Springer
    Earth, moon and planets 65 (1994), S. 79-88 
    Details
    ISSN: 1573-0794
    Keywords: Geoid ; Geopotential Scale FactorR 0 ; GeopotentialW 0 ; Satellite Altimetry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Altimetric measurements of the GEOSAT satellite were used for the determination of geopotential scale factorR 0. The geopotential valueW 0 on the geoid surface was then computed (W 0 =GM/R 0). The GEOSAT Geophysical Data Records (GDR's) covering an initial period of the Exact Repeat Mission (ERM) were filtered and processed. The necessary corrections were made in order to allow a precise detection of the sea surface. Gravitational geopotential, rotation and permanent tides were taken into account and the equipotential surface which is the best approximation of the sea surface was found. The determination of the potential valueW 0 on the mean geoid surface in this way is very promising. An associated value withW 0 - the geopotential scale factorR 0 - seems to be a very good Earth dimension defining quantity. Moreover, there are many possible applications ofW 0 (R 0) in modern geophysics. The incorporation of one of these parameters - we now recommendR 0 - into the set of the Primary Geodetic Parameters (PGP) is discussed and suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00572201
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  • 9
    Electronic Resource
    Electronic Resource
    Capture of dust grains in exterior resonances with planets (1996)
    Springer
    Earth, moon and planets 72 (1996), S. 175-178 
    Details
    ISSN: 1573-0794
    Keywords: Interplanetary matter ; Dust ; Resonances
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The temporary capture of the dust grains in the exterior resonances with planets is studied in the frames of the planar circular three-body problem with Poynting-Robertson (PR) drag. For the Earth and particles ~ 10 Μm the resonances 4/5, 5/6, 6/7, 7/8 are shown to be most effective. The capture is only temporary (of order 105 years) and the position of resonance may be calculated from semi-analytical model using averaged disturbing function. These semi-analytical results are confirmed by numerical integration. For various planet this picture changes as with increasing planetary mass the more exterior resonances become more important. We showed that for Jupiter (at least in the space between Jupiter and Saturn) the resonance 1/2 plays the dominant role. The capture time is here several myr but again eccentricity is evolving to eccentricity e 0 ~ 0.48 of libration point for this resonance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00117515
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  • 10
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    Unknown
    Helium concentrations of ODP Hole 121-757B (2006)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 121-757B; AGE; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Fraction; Helium-3; Helium-3, extraterrestrial, flux; Helium-3/Helium-4; Joides Resolution; Leg121; Ocean Drilling Program; ODP; Sample code/label; South Indian Ridge, South Indian Ocean
    Type: Dataset
    Format: text/tab-separated-values, 672 data points
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    DATA PANGAEA
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