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  • Articles  (6)
  • Comets
  • Springer  (6)
  • Oxford University Press
  • 2020-2023
  • 1995-1999  (6)
  • 1996  (6)
  • Geosciences  (6)
Collection
  • Articles  (6)
Source
Keywords
Publisher
  • Springer  (6)
  • Oxford University Press
Years
  • 2020-2023
  • 1995-1999  (6)
Year
Topic
  • 1
    Electronic Resource
    Electronic Resource
    On the existence of small comets and their interactions with planets (1996)
    Springer
    Earth, moon and planets 72 (1996), S. 243-249 
    Details
    ISSN: 1573-0794
    Keywords: Comets ; small ; search program ; planets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Arguments are presented for a substantial, unexplored population of comets with radii less than 1 km. Known examples confirm this population and extrapolation of any plausible size-distribution function indicates large numbers. However, their accurate numbers, orbital characteristics, and physical properties are unknown. Thus, even though the small comets may be the most frequent cometary bodies impacting the planets, a quantitative evaluation is not currently possible. We advocate an optimized, dedicated search program to characterize this population.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00117524
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Comet Hale-Bopp (1995 O1) (1996)
    Springer
    Earth, moon and planets 73 (1996), S. 15-22 
    Details
    ISSN: 1573-0794
    Keywords: Comets ; named objects ; Comet Hale-Bopp (199501) ; photometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Considerable interest has been raised by the discovery of Comet Hale-Bopp (1995 O1) and the possibility that it might become a very bright object in Spring 1997. The evidence to support either of the conflicting hypothesis (an intrinsically bright comet or a faint comet in a very large outburst) is too limited to reach solid conclusions and may remain so for some months yet. The pre-discovery observations encountered to date provide some limits to photometric models and suggest that the comet may be intrinsically bright, but do not yet permit a firm discrimination, even between extreme scenarios, due to the enormous extrapolation that must be made from the heliocentric distance at discovery, to that of perihelion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00058042
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  • 3
    Electronic Resource
    Electronic Resource
    Dynamical evolution of comets and the problem of cometary fading (1996)
    Springer
    Earth, moon and planets 72 (1996), S. 35-40 
    Details
    ISSN: 1573-0794
    Keywords: Comets ; dynamics ; fading problem
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Possibilities to explain the observed 1/a-distribution are discussed in the light of improved understanding of the dynamical evolution of long-period comets. It appears that the ‘fading problem’ applies both to single-injection and continuous-injection models. Although uncertainties due to nongravitational effects do not allow detailed results to be drawn from the observed 1/a-distribution at small perihelion distance q, that for q ≳ 1.5 AU shows that a constant fading probability cannot explain all the features of the observed distribution. Assuming that comets can reappear following a period of fading, values for the assumed constant fading and renewal probabilities, and the total cometary flux have been estimated for q 〉 1.5 AU.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00117500
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  • 4
    Electronic Resource
    Electronic Resource
    Light curve behaviour in C/1995 O1 (Hale-Bopp) — II (1996)
    Springer
    Earth, moon and planets 75 (1996), S. 87-94 
    Details
    ISSN: 1573-0794
    Keywords: Comets ; named objects ; C/1995 O1 (Hale-Bopp)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Comet Hale-Bopp is, without doubt, one of the most important objects for cometary science which has ever been observed. The light curve is well-observed from a heliocentric distance 7.2 AU and some information is available at distances as great as 17 AU. This allows the photometric evolution of the comet to be studied as different volatiles dominate the activity. Three different phases of activity are seen as the heliocentric distance reduces during 1996: the initial phase of very fast brightening, characterized by a r −5 law; a “standstill” in the light curve when the brightening law reduced to r −1, which coincides with the initiation of water sublimation at r ~ 4 AU; and a further phase of more rapid brightening with an r −3.5 law, similar to the mean for comets classed as “fairly new”, which initiated at r ~ 4 AU.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00054506
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  • 5
    Electronic Resource
    Electronic Resource
    The provenance and evolution of comets (1996)
    Springer
    Earth, moon and planets 72 (1996), S. 57-68 
    Details
    ISSN: 1573-0794
    Keywords: Comets ; interstellar dust ; dynamics ; solar neutrino problem
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The process of comet formation through the hierarchical aggregation of originally submicron-sized interstellar grains to form micron-sized particles and then larger bodies in the protoplanetary disc, culminating in the formation of planetesimals in the disc extending from Jupiter to beyond Neptune, is briefly reviewed. The ‘planetesimal’ theory for the origin of comets implies the existence of distinct cometary reservoirs, with implications for the immediate provenance of observed comets (both long-period and short-period) and their evolution as a result of planetary perturbations and physical decay, for example splitting and sublimation. The principal mode of cometary decay and collisional interaction with the terrestrial planets is through the formation and evolution of streams of cometary debris and hitherto undiscovered ‘families’ of cometary asteroids. Recent dynamical results, in particular the sungrazing and sun-colliding end-state for short-period comet and asteroid orbits, are briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00117504
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  • 6
    Electronic Resource
    Electronic Resource
    An analytical model of the Comet's collision with Jupiter (1996)
    Springer
    Earth, moon and planets 73 (1996), S. 23-32 
    Details
    ISSN: 1573-0794
    Keywords: Comets ; Collision ; Jupiter
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract An important feature observed in the wake of the Jupiter-comet clash was the appearance of the ring structure axisymmetrically positioned around the center of the impact. The persistent expansion of the dark rings and its speed indicated an outward propagating gravity wave (Benka, 1995). We employ an analytical model of constant density, uniform finite depth and inviscid fluid layer to investigate the wave motion produced by the impact of Comet Shoemaker-Levy 9 on the Jovian atmosphere. The relevant thermal effects are neglected and an explosion resulting from the collision is then described by an initial impulsive pressure at the surface of the Jovian atmosphere. Under the assumption that all the kinetic energy of a comet fragment is completely converted into the energy of wave motions in the Jovian atmosphere, an analytical formula describing the relationship between the resulting wave motion in the atmosphere and the parameters of a comet fragment (the radius, density and speed) is derived. Results from the present simple analytical model give a qualitative agreement with observations regarding the distance and speed of the waves.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00058043
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