Results 111 to 120 of about 243 (142)

The Dust Tail of Comet Bradfield 1987XXIX

1990
In this paper the reduction and the analysis of two images comcerning the dust tail of Comet Bradfield 1987XXIX are discussed. The plates (CRT7 + W16) were obtained by means of a 20/25/50 cm Schmidt camera. The adopted emulsion and filter combination (pass band 520–570 nm) approximates the standard V photometric system, thus dropping most of the plasma
M. Fulle, G. Cremonese, A. Cimatti
openaire   +1 more source

Model analysis of the dust tail of comet Hale-Bopp

Kinematics and Physics of Celestial Bodies, 2009
The paper presents the results of dynamic simulation for the dust tail formation of comet C/1995 O1 (Hale-Bopp). To simulate the dust tail, the trajectories of 2 × 106 dust particles were traced. The sizes, ejection moments, outflow directions and velocities of the dust particles were defined by the Monte Carlo algorithm. The obtained three-dimensional
S. V. Kharchuk, P. P. Korsun, H. Mikuz
openaire   +1 more source

The anomalous dust tail of comet P/Tempel 2

Monthly Notices of the Royal Astronomical Society, 1984
La queue etroite de poussiere de la comete P/Tempel 2, observee par le satellite IRAS, est le resultat d'emissions a faible vitesse de particules larges. L'analyse dynamique des particules de poussiere sous l'influence de la pression de radiation solaire indique que certaines de ces emissions peuvent avoir eu lieu au moins 1500 jours avant les ...
N. Eaton, J. K. Davies, S. F. Green
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +1 more source

Dust emission structure in comets with type II tails

Astrophysics and Space Science, 1974
Short exposure plates of Comet Arend-Roland (1956h) are examined and compared with similar photographs of Comet Bennett (1969i), Comet Halley (1910 II) and Comet Mrkos (1957d). It is found that the emission structure of the dust near the nucleus in the first comet is different from that in the others, although in all cases we have the formation of ...
openaire   +1 more source

Model of the dust tail of comet C/2011 L4 (PANSTARRS)

Kinematics and Physics of Celestial Bodies, 2015
Results of dynamic modeling of the dust tail formation for the comet C/2011 L4 (PANSTARRS) are presented. To simulate the dust tail, the trajectories of 100 million dust particles were traced. Their sizes, ejection moments, outflow directions, and initial velocities were defined by the Monte Carlo algorithm.
S. V. Kharchuk, P. P. Korsun
openaire   +1 more source

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.
openaire   +2 more sources

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
openaire   +1 more source

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
openaire   +1 more source