The astrometric observations of planetary satellites, close approaches and occultations of stars by asteroids and mutual events in the systems of planetary satellites with the 26-in. refractor of Pulkovo observatory in 1995-2006     

T.P. Kiseleva  I.S. Izmailov  A.A. Kiselev  E.V. Khrutskaya  M.Yu. Khovritchev 《Planetary and Space Science》2008,56(14):1908-1912

Astrometric and photometric observations of major planets, their satellites and asteroids have been made with the 26-in. refractor of the Pulkovo observatory during the period from 1995 to 2006. The CCD (ST6) and photographic observations were carried out. Accurate relative position of satellites of Jupiter and Saturn have been derived. The positions of Saturn have been calculated using the theoretically predicted coordinates of satellites relative to the planet without measurements of the photographic images of the planet. Also the observations of Hale-Bopp comet and Mercury transit have been made. The 26-in. refractor has been included into the international campaign PHEMU-2003: photometric CCD observations of mutual occultations and eclipses of Galilean satellites. The light curves of the events have been obtained and parameters of the events have been determined.  相似文献   

Polarization opposition effect for the Galilean satellites of Jupiter     

Vera K. Rosenbush  Nikolai N. Kiselev 《Icarus》2005,179(2):490-496

We present results of polarimetric observations of the Galilean satellites Io, Europa, Ganymede, and Callisto at phase angles ranging from 0.19° to 2.22°. The observations in the UBVR filters were performed using a one-channel photoelectric polarimeter attached to 70-cm telescope of the Chuguev Observation Station (Ukraine) on November 19-December 7, 2000. We have observed the polarization opposition effect for Io, Europa, and Ganymede to be a sharp secondary spike of negative polarization with an amplitude of about −0.4% centered at phase angles of 0.2°-0.7° and superimposed on the regular negative polarization branch. Although these minima for Io, Europa, and Ganymede show many similarities, they also exhibit a number of distinctions. The polarization opposition effect appears to be wavelength-dependent, at least for Europa and Ganymede. No polarization opposition effect was found for Callisto. The results obtained are discussed within the framework of different mechanisms of light scattering.  相似文献   

Comments to the paper “Analysis of early instrumental air temperature observations before and after the Tambora volcano eruption”     

A. A. Kiselev 《Russian Meteorology and Hydrology》2017,42(10):685-688

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The Second All-Russia Conference on the Jurassic System of Russia: Problems of Stratigraphy and Paleogeography     

V. A. Zakharov  M. A. Rogov  O. S. Dzyuba  D. N. Kiselev 《Stratigraphy and Geological Correlation》2008,16(3):343-346

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Permian-triassic traps of the East Siberian Craton: The problem of estimation of the sources of phanerozoic intraplate magmatism     

A. I. Kiselev  V. V. Yarmolyuk  M. D. Tomshin  A. V. Nikiforov  K. N. Egorov 《Doklady Earth Sciences》2014,455(1):299-305

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Devonian swarms of dolerite dykes in the northeastern Siberian craton and their relation to the Vilyui plume     

A. I. Kiselev  V. V. Yarmolyuk  M. D. Tomshin 《Doklady Earth Sciences》2010,434(2):1291-1297

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CCD imaging polarimetry of Comet 2P/Encke     

Nikolai N. Kiselev  Klaus Jockers 《Icarus》2004,168(2):385-391

We present results and analysis of imaging polarimetric observations of Comet 2P/Encke. The observations were carried out at the 2-m RCC telescope of the Bulgarian National Astronomical Observatory on December 13, 1993 and on January 14, 1994, at phase angles 51.1° and 80.5°, respectively. A wide-band red filter 6940/790 Å was used. This filter is transparent for the continuum and the weak emission bands of NH₂ and H₂O⁺. There is a sunward dust fan with well-defined polarization, which peaks at≈13% in the image obtained on January 14, 1994. Along the sunward fan the degree of polarization decreases progressively. Outside of the fan the coma displays a low polarization of ≈3%. We suggest that this low polarization is caused by the NH₂ emission in the pass-band of the red wide-band filter. Assuming a spherically symmetric NH₂ coma we are able to correct the observed polarization for this effect. The correction leads to an increase of the observed polarization by 1 to 4% at distances 10,000 and 1500 km from the nucleus. A rough estimate shows that the polarization in the near nucleus region of Comet Encke is similar to that for the dusty comets. Even after correction the polarization of Comet Encke's dust fan is significantly less that the polarization observed in dusty comets. The reasons influencing the distribution of dust polarization in the coma are discussed. More polarimetric and colorimetric observations of the dust in Comet Encke on its return in 2003 are needed.  相似文献   

Photographic observations of comet Hale-Bopp at the Pulkovo Observatory: The detection of dust envelopes     

Yu. N. Gnedin  A. A. Kiselev  T. P. Kiseleva  K. L. Maslennikov 《Astronomy Letters》2001,27(4):249-253

The photographic observations of comet Hale-Bopp with the 26-inch Pulkovo Observatory refractor in March–April, 1998, revealed three hemispherical gas-dust envelopes and one spiral jet in the comet head. We determined the angular distances of these envelopes from the comet nucleus and estimated their velocities. The masses and sizes of dust grains were estimated. We conclude that submicron-sized grains dominate in the envelopes. We also estimated the time scale of the comet nuclear activity, which manifests itself in dust ejection, the initial velocity of the ejected dust grains, and the ratio of the radiation-pressure force exerted on dust grains to the force of their gravitational attraction to the Sun. Our observations yielded an estimate for the radius of the comet nucleus, ～30 km.  相似文献   

Polarimetry of major Uranian moons at the 6-m telescope     

V. L. Afanasiev  V. K. Rosenbush  N. N. Kiselev 《Astrophysical Bulletin》2014,69(2):211-223

We present the results of polarimetric observations of the icymoons of Uranus (Ariel, Titania, Oberon, and Umbriel) performed at the 6-m BTA telescope of the SAO RAS with the SCORPIO-2 focal reducer within the phase angle range of $0_.^ \circ 06 - 2_.^ \circ 37$ . The parameters of the negative polarization branch (referred to the scattering plane) are obtained in the V filter: for Ariel the maximum branch depth of P _min ≈ ?1.4% is reached at the phase angle of α _min ≈ 1°; for Titania P _min ≈ ?1.2%, $\alpha _{\min } \approx 1_.^ \circ 4$ ; for Oberon P _min ≈ ?1.1%, $\alpha _{\min } \approx 1_.^ \circ 8$ . For Umbriel the polarization minimum was not reached: for the last measurement point at $\alpha _{\min } \approx 2_.^ \circ 4$ , polarization amounts to ?1.7%. The declining P _min and shifting α_min towards larger phase angles correlate with a decrease of the geometric albedo of the Uranian moons. There is no longitudinal dependence of polarization for the moons within the observational errors which indicates a similarity in the physical properties of the leading and trailing hemispheres. The phase-angle dependences of polarization for the major moons of Uranus are quite close to those observed in the group of small trans-Neptunian objects (Ixion, Huya, Varuna, 1999 DE9, etc.), which are characterized by a large gradient of negative polarization, about ?1% per degree in the phase-angle range of $0_.^ \circ 1 - 1^ \circ$ .  相似文献   

Gallium, gold, and platinum group metals in manganese rocks of Southern Sikhote Alin     

V. T. Kazachenko  N. V. Miroshnichenko  E. V. Perevoznikova  V. M. Chubarov  V. I. Kiselev  V. A. Solyanik 《Doklady Earth Sciences》2006,407(3):429-433

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