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Information × Registration Number 0213U006758, 0113U002591 , R & D reports Title Investigation of cometary of Solar system bodies at large heliocentric distances popup.stage_title Head Korsun Pavlo P., Registration Date 27-12-2013 Organization Main Astronomical Observatory popup.description2 Spectrophotometric monitoring of comet C/2002 VQ94 (LINEAR) and comet C/2006 S3 (LONEOS) was performed with the 6-m telescope of SAO RAS, the 2.5-m Nordic Optical Telescope (Observatory del Roque de los Muchachos, Canarias, Spain) and 2-m telescope of Terskol. Analysis of the spectra of C/2002 VQ94 (LINEAR) revealed the presence of the CO+ and N2+ emissions in the cometary coma at a distance of 8.36 au from the Sun. Only continuum due to scattering of the solar radiation by dust particles, with no traces of emissions, was detected in the spectrum obtained in 2009 when the comet was at a distance of 9.86 au. Images obtained through continuum filters indicate a high level of physical activity. The calculated Af parameters correspond to dust production rates between 20-30 kg/sec and 5-9 kg/s at distances of 8.36 and 13.40 au respectively. There is an obvious correlation between the considerable decrease of the dust production rate of the nucleus and the disappearance of the emissions in the spectrum of C/2002 VQ94 (LINEAR) at heliocentric distances greater than 9 au. The spectra of comet C/2006 S3 (LONEOS) have no emission lines in the visible spectral range. The calculated Af values imply the dust production rates within the interval of 3 and 15 kg/s, when the comet was on the inbound part of its orbit between 13.8 and 7.2 a.u. Considerable increase of the physical activity of the cometary nucleus took place, probably, between 10 and 7 a.u., which correspond to the equilibrium temperatures of 90 - 100K. The increase of the physical activity in this temperature range was likely caused by annealing of amorphous ices under the solar radiation. Product Description popup.authors Іванова О. В. Корсун П. П. Кулик І. В. popup.nrat_date 2020-04-02 Close