Comet 2P/Encke in apparitions of 2013 and 2017: I. Imaging photometry and long-slit spectroscopy

Rosenbush, V. K.; Ivanova, Oleksandra; Клещонок, В. В.; Kiselev, N. N.; Afanasiev, V. L.; Shubina, O.; Петров, Д. В.

doi:10.1016/j.icarus.2020.113767

Cited by 14 publications

(14 citation statements)

References 78 publications

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“…Structural feature 1 in the same images practically coincides with the anti-solar direction and has a noticeable extension, which suggests that in this case we observe the cometary tail. Such behaviour of structures in the inner coma, as well as changes in its shape and dust production rate around perihelion, is very similar to the behaviour of well-studied comet 2P/Encke (Sekanina, 1979;Rosenbush et al, 2020). There are two active areas in the nucleus of comet 2P/Encke that have been existing for a sufficiently long period of time.…”

Section: Interpretation and Discussion Of The Resultssupporting

confidence: 77%

Specific Features of Structures in the Inner Coma of Comet C/2017 T2 (Panstarrs) as Observed With the Omt-800 Telescope of the Odessa Observatory Telescope Network

Kleshchenok

Kashuba

Andrievsky

et al. 2020

OAP

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Observations of the comet were carried out using the OMT-800 telescope (the primary mirror diameter D = 80 cm; the focal length F = 214 cm) of the Odessa Observatory telescope network from January to June 2020. Image processing was performed through standard methods using subtraction of dark and flat field frames. The resulting frames were employed to analyse the morphology of the cometary inner coma using digital filters. Isophotes of the coma and images of its structures appearing as fans and jets were obtained. The presence of a strong fan, which distorts the coma's standard appearance and makes it elongated perpendicularly to the Sun-comet line, is observed over the period from January to April. Later on, a weak jet that hardly affects the coma's standard shape appears to replace the fan. The jet reaches its peak intensity near perihelion and then gets fainter rapidly. Such behaviour of the coma structures is indicative of the presence of two active areas on the cometary nucleus surface, for which the matter outflow is governed by the Sun illumination conditions. One of these areas, being more active, is responsible for the appearance of a strong fan. The other area, which is far less active, generates a jet that manifests itself near perihelion. The peak dust production of the comet 120-150 days before perihelion is due to the presence of an active fan in the inner coma.

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Section: Interpretation and Discussion Of The Resultssupporting

confidence: 77%

Specific Features of Structures in the Inner Coma of Comet C/2017 T2 (Panstarrs) as Observed With the Omt-800 Telescope of the Odessa Observatory Telescope Network

Kleshchenok

Kashuba

Andrievsky

et al. 2020

OAP

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“…In order to reproduce the observed jet morphology, we used a simple geometrical model, the theoretical description of which is given in Appendix A. Recently this model was used for modeling the dust jets and fan in comet 2P/Encke (Rosenbush et al 2020). The proposed model accounts for the orientation of the nucleus spin axis and its rotation period, the location of the active source on the nucleus, and the relative position of the Sun, Earth, and the comet.…”

Section: Modeling the Dust Structuresmentioning

confidence: 99%

Observations of distant comet C/2011 KP36 (Spacewatch): photometry, spectroscopy, and polarimetry

Ivanova

Rosenbush

Lukyanyk

et al. 2021

A&A

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Aims. The main objective of our study is to obtain new observational results for the active long-period comet C/2011 KP36 (Spacewatch). This comet has unusual orbital properties and moves at distances larger than 5 au from the Sun. Methods. We carried out extensive observations of comet C/2011 KP36 (Spacewatch) at the 6-m BTA telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences with the focal reducer SCORPIO-2. We obtained quasi-simultaneous long-slit spectra in the visible, as well as photometric and linear polarimetric images with the g-sdss and r-sdss filters on November 25, 2016 when the heliocentric and geocentric distances of the comet were 5.06 au and 4.47 au, respectively. We modeled the behavior of the color and polarization in the coma, considering the dust as an ensemble of polydisperse nonspherical particles. Results. Two strong jet-like structures in solar and antisolar directions and two short and narrow jet features in the perpendicular direction were revealed in the coma. Our simulations showed that the latter two jets originated from the same active area. We determined the orientation of the rotation axis of the nucleus and the position of three active areas. High activity of the comet was characterized by Afρ values of 1065 ± 11 cm in the g-sdss filter and 1264 ± 17 cm in the r-sdss filter. The comet was found to be rich in CO+, while there was no clear detection of CN, C3, C2, and N2+. The dust color g–r varies over the coma from about 0.2m to 0.7m, and the linear polarization degree from about −1% to −6% at the phase angle 9.6°. The color of the nucleus of comet C/2011 KP36 (Spacewatch) is ultrared, B – R = 1.9m ± 0.3m. Conclusions. The high variability of the observed characteristics over the coma of comet C/2011 KP36 (Spacewatch) indicates significant and variable activity of the nucleus with, probably, numerous small active areas. Together with the three identified large active areas, they are characterized by different combinations of water ice, CO2 ice, and refractory dust and sizes of their particles, which are in the micron-size range.

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“…Specific of the orbit of comet 2P/Encke (hereafter Encke) allows an intensive study its gas and dust coma, (see Newburn and Spinrad (1985), Gehrz et al (1989), Walker (1992), Fern� andez et al (2005), Harmon and Nolan (2005), Sarugaku et al (2015), Kwon et al (2018), and our work Rosenbush et al (2020) (hereafter referred as Paper I). Below we briefly review the results of the previous observations of comet Encke, which are necessary for discussion of the results obtained in this work.…”

Section: Introductionmentioning

confidence: 99%

Comet 2P/Encke in apparition of 2017: II. Polarization and color

Kiselev

Rosenbush

Ivanova

et al. 2020

Icarus

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Comet 2P/Encke in apparitions of 2013 and 2017: I. Imaging photometry and long-slit spectroscopy

Cited by 14 publications

References 78 publications

Specific Features of Structures in the Inner Coma of Comet C/2017 T2 (Panstarrs) as Observed With the Omt-800 Telescope of the Odessa Observatory Telescope Network

Specific Features of Structures in the Inner Coma of Comet C/2017 T2 (Panstarrs) as Observed With the Omt-800 Telescope of the Odessa Observatory Telescope Network

Observations of distant comet C/2011 KP36 (Spacewatch): photometry, spectroscopy, and polarimetry

Comet 2P/Encke in apparition of 2017: II. Polarization and color

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