Crater-diameter distribution on Comets 9P and 81P and potential meteoroid streams crossing their orbits

Ivanova, Oleksandra; Neslušan, L.; Svoreň, J.; Krišandová, Zuzana Seman

doi:10.1016/j.icarus.2015.03.023

Cited by 9 publications

(20 citation statements)

References 26 publications

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“…For the short-period comets 9P/Tempel 1 and 81P/Wild 2, there were found 110 and 129 approaches to the orbits of known periodic comets (Marsden and Williams, 2005) within 0.15 AU. Comet 1P/Halley approached such orbits 103 times (Ivanova et al, 2015). Considering the same sample of known, cataloged comets, we however found only 2, 13, 4, 4, and 23 approaches within 0.15 AU to the orbits of C/2007 D1, C/2007 D3, C/2010 G3, C/2010 S1, and C/2012 K6, respectively.…”

Section: A Discussion Of the Dust-production Mechanismsmentioning

confidence: 54%

Observations of Comets C/2007 D1 (LINEAR), C/2007 D3 (LINEAR), C/2010 G3 (WISE), C/2010 S1 (LINEAR), and C/2012 K6 (McNaught) at large heliocentric distances

Ivanova

Neslušan

Krišandová

et al. 2015

Icarus

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Photometric and spectroscopic observations of five nearly parabolic comets with eccentricity larger than 0.99 at heliocentric distances greater than 4 AU were performed. No molecular emission was observed for any studied comet and the entire cometary activity in all cases was attributed to dust production. Upper limits of the gas production rates for the main neutral molecules in the cometary comae were calculated. The derived values of dust apparent magnitudes were used to estimate the upper limit of the geometric cross-section of cometary nuclei (upper limits of radii range from 2 km to 28 km). Due to the poor sublimation of water ice at these distances from the Sun, other mechanisms triggering activity in comets are discussed.

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Section: A Discussion Of the Dust-production Mechanismsmentioning

confidence: 54%

Observations of Comets C/2007 D1 (LINEAR), C/2007 D3 (LINEAR), C/2010 G3 (WISE), C/2010 S1 (LINEAR), and C/2012 K6 (McNaught) at large heliocentric distances

Ivanova

Neslušan

Krišandová

et al. 2015

Icarus

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“…At larger heliocentric distances highly volatile molecules other than water, mostly CO, are responsible for the formation of dusty comae (Bar-Nun et al 1985;Meech & Svoren 2004). However the gaseous emissions of daughter species are rarely observed in the optical spectral region due to the r −2 dependence of the absorption and emission rates in the case of the resonance-fluorescence excitation mechanism (Korsun et al 2014;Ivanova et al 2015;Womack et al 2017). Therefore, we used broadband BVRI photometry to obtain some global characteristics of dust environment of the selected comets assuming absence of emission lines in the optical spectral range.…”

Section: Introductionmentioning

confidence: 99%

Physical activity of the selected nearly isotropic comets with perihelia at large heliocentric distance

Kulyk

Rousselot

Корсун

et al. 2018

A&A

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Context. The systematic investigation of comets in a wide range of heliocentric distances can contribute to a better understanding of the physical mechanisms that trigger activity at large distances from the Sun and reveals possible differences in the composition of outer solar system bodies belonging to various dynamical groups. Aims. We seek to analyze the dust environment of the selected nearly isotropic comets with a perihelion distance between 4.5 and 9.1 au, where sublimation of water ice is considered to be negligible. Methods. We present results of multicolor broadband photometric observations for 14 distant active objects conducted between 2008 and 2015 with various telescopes. Images obtained with broadband filters were used to investigate optical colors of the cometary comae and to quantify physical activity of the comet nuclei. Results. The activity level was estimated with Afρ parameters ranging between 95 ± 10 cm and 9600 ± 300 cm. Three returning comets were less active than the dynamically new comets. Dust production rates of the comet nuclei were estimated between 1 and 100 kg s−1 based on some assumptions about the physical properties of dust particles populating comae. The measured colors point out reddening of the continuum for all the comets. The mean values of a normalized reflectivity gradient within the group of the comets amount to 14 ± 2% per 1000 Å and 3 ± 2% per 1000 Å in the BV and VR spectral domains, respectively. The comae of the dynamically new comets, which were observed on their inbound legs, may be slightly redder in the blue spectral interval than comae of the comets observed after the perihelion passages. The dynamically new comets observed both pre- and post-perihelion, seem to have higher production rates post-perihelion than pre-perihelion for similar heliocentric distances.

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“…In 2006, the 6-m SAO RAS telescope started a comprehensive program aimed at investigating the activity of distant comets, including a search for gas emissions responsible for the formation of comets and the tails of these comets. Long-slit spectra were obtained for more [42,43,45]. than 30 distant comets over the course of ten years.…”

Section: Spectral Studies Of Distant Cometsmentioning

confidence: 99%

“…This allowed us to organize and broaden our knowledge on LPCs, since only a few of them had such data available previously. An analysis has shown that most of the considered comets demonstrate only continuous spectra [42,43,60,102], determined by the scatter of solar radiation on comet dust (Fig. 2).…”

Section: Spectral Studies Of Distant Cometsmentioning

confidence: 99%

“…Wavelength dependences of dust scatter efficiency were obtained for distant comet spectra. In most cases this allowed us to register the reddening effect (scatter efficiency increasing with wavelength) [42,43,49,57,58,60,61]. However, for some comets the efficiency of solar emission scatter by dust was higher in the blue spectral region than in the red [60].…”

Section: Spectral Studies Of Distant Cometsmentioning

confidence: 99%

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Small Bodies of the Solar System Active at Large Heliocentric Distances: Studies with the 6-Meter Telescope of Sao Ras

Ivanova

2020

Astrophys. Bull.

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A detailed study of comets active at large heliocentric distances (greater than 4 au) which enter the Solar System for the first time and are composed of matter in its elementary, unprocessed state, would help in our understanding of the history and evolution of the Solar System. In particular, contemporary giant planet formation models require the presence of accretion of volatile elements such as neon, argon, krypton, xenon and others, which initially could not survive at the distances where giant planets were formed. Nevertheless, the volatile components could be effectively delivered by the Kuiper-belt and Oort-cloud bodies, which were formed at temperatures below 30 K. This review is dedicated to the results of a multi-year comprehensive study of small bodies of the Solar System showing a comet-like activity at large heliocentric distances. The data were obtained from observations with the 6meter telescope of SAO RAS equipped with multi-mode focal reducers SCORPIO and SCORPIO-2.

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Crater-diameter distribution on Comets 9P and 81P and potential meteoroid streams crossing their orbits

Cited by 9 publications

References 26 publications

Observations of Comets C/2007 D1 (LINEAR), C/2007 D3 (LINEAR), C/2010 G3 (WISE), C/2010 S1 (LINEAR), and C/2012 K6 (McNaught) at large heliocentric distances

Observations of Comets C/2007 D1 (LINEAR), C/2007 D3 (LINEAR), C/2010 G3 (WISE), C/2010 S1 (LINEAR), and C/2012 K6 (McNaught) at large heliocentric distances

Physical activity of the selected nearly isotropic comets with perihelia at large heliocentric distance

Small Bodies of the Solar System Active at Large Heliocentric Distances: Studies with the 6-Meter Telescope of Sao Ras

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