Results 111 to 120 of about 239 (145)

Can the Sodium Tail of Comet Hale-Bopp Have a Dust-Impact Origin?

The Astrophysical Journal, 1998
Consideration is given to the possible mechanisms responsible for the production of the atomic sodium tail of comet Hale-Bopp. It is shown that both photosputtering and ion sputtering of nonvolatile dust grains might not be the main driving force. Instead, the generation of impact vapor by collisional interaction between the cometary dust coma of ...
Ip, W., Jorda, L.
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Striated features in the dust tail of comet C/2006 P1 (McNaught)

Kinematics and Physics of Celestial Bodies, 2010
To explain the distinct transversal striae observed in the tail of comet C/2006 P1 (McNaught) near the perihelion, a dynamic model for the formation of the dust tail of the comet has been developed. It is supposed that, on the surface of the nucleus, there are three local active domains of the increased outflow of the material.
S. V. Kharchuk, P. P. Korsun
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Model analysis of the dust tail of comet C/2012 K5 (LINEAR)

Kinematics and Physics of Celestial Bodies, 2015
From the dynamic modeling of the process forming the dust tail of comet C/2012 K5 (LINEAR), the brightness distribution in this dust tail has been retrieved. The model developed by Korsun on the basis of the statistical Monte-Carlo approach was used. The adequacy of the model was determined by fitting the observed and modeled isophots.
S. V. Kharchuk, O. V. Ivanova, P. P. Korsun, O. R. Baransky   +3 more
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The dust tail of comet P/Halley in April 1986

1988
Images of the dust tail of comet Halley were obtained with the ESO wide-field CCD camera during April 1986 with the Johnson B, V and R filters in polarized light. An analysis of selected images taken on April 6 and 11, processed for photometric analysis, is presented.
P. L. Lamy, H. Pedersen, R. Vio
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Finite lifetime fragment model for synchronic band formation in dust tails of Comets

Icarus, 1990
Abstract A finite lifetime fragment model is proposed for the formation of synchronic bands in dust tails of comets. Applying the simultaneous fragmentation model proposed by Sekanina and Farrell (1980) to three comets (Mrkos, Seki-Lines, West), we found the lifetime of the fragment to range from 25 to 70 days.
Kimihiko Nishioka, Jun-Ichi Watanabe
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Evidence for the nucleus rotation in streamer patterns of Comet Halley's dust tail

Astrophysics and Space Science, 1987
A generalized Finson-Probstein formalism was used to analyse the streamer patterns in the dust tail of Comet Halley as observed between 22 February and 11 March, 1986. A periodic appearance of a pattern of double streamers was found in the dust tail, indicating a time interval in the emission of this structures of about 6.5 days, if interpreted as ...
K. Beisser, H. Boehnhardt
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Indication for precession of comet Halley's nucleus from dust tail analysis

Earth, Moon, and Planets, 1990
The distinct structures ta comet Halley's dust tail around the beginning of March 1986 are analyzed by means of a computer simulation based on nucleus data obtained by the Giotto mission. It is shown that the assumption of a considerable free precession is required to understand the ground based dust tail observations from that time supposing a ...
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The striae in the dust tails of great comets — a comparison to various theories

Astronomische Nachrichten, 1988
AbstractWe reanalyse positions and motion of the striae in the dust tails of the bright comets Mrkos 1957 V and West 1976 VI. Two theories are compared to the data: the high speed particle ejection theory of NOTNI (1964) and the two‐step kinematical sequence proposed by SEKANINA and FARRELL (1980) in their particle fragmentation theory.
P. Notni, W. ThÄnert
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The motion of dust and gas in the heads of comets with type II tails

Astrophysics and Space Science, 1972
Photographs of Comet Bennett 1969i taken in the dust-scattered continuum reveal that the dust particles, leading to the formation of the type II tail, leave the vicinity of the nucleus only within a certain cone with the aperture in the direction to the Sun.
Karl Wurm, Augusto Mammano
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Changing linear polarization properties in the dust tail of comet C/2012 S1 (ISON)

Icarus, 2020
Abstract Polarization measurements made with the STEREO/SECCHI COR1 and COR2 coronagraphs during the perihelion passage of sungrazing comet C/2012 S1 (ISON) in November 2013 are presented and compared with earlier measurements made of Kreutz sungrazing comet C/2011 W3 (Lovejoy).
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