Anton Kochergin
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View article: Comets with extremely low positive polarization
Comets with extremely low positive polarization Open
Polarimetric observations of comets reveal that sunlight scattered from their comae acquires partial linear polarization that can be quantified with the degree of linear polarization P = (F⊥ – F)/(F⊥ + F). Here F⊥ a…
View article: Characterizing atmospheric aerosols using polarimetry and shadow hiding
Characterizing atmospheric aerosols using polarimetry and shadow hiding Open
Unpolarized sunlight is scattered by aerosols acquiring partial linear polarization. By aiming a ground-based detector vertically upward, it can record the polarimetric response of aerosols that are illuminated by the Sun. As the Sun sets,…
View article: On the extremely low polarization in Comet C/2023 P1 (Nishimura)
On the extremely low polarization in Comet C/2023 P1 (Nishimura) Open
On September 6 and 7 of 2023, we measured the degree of linear polarization of Comet C/2023 P1 (Nishimura) with the R filter. Our observations reveal an extremely low amplitude of positive polarization. Our modelling suggests Mg-rich silic…
View article: Polarimetry of the Total Lunar Eclipse on 2022 November 8
Polarimetry of the Total Lunar Eclipse on 2022 November 8 Open
We have measured the degree of linear polarization of the Moon during its total eclipse on 2022 November 8, and found P ≈ −2% in the V filter. The plane of preferential polarization was oriented at ∼36° counting clockwise from the lunar eq…
View article: C/2020 S3 (Erasmus): Comet with a presumably transient maximum of linear polarization <i>P</i>max
C/2020 S3 (Erasmus): Comet with a presumably transient maximum of linear polarization <i>P</i>max Open
We measured the degree of linear polarization of Comet C/2020 S3 (Erasmus) on 2020 November 13, 20, 22, and 23, while the comet was observed at large phase angles, α = 62.6°–66.6°. On the first two epochs, the polarization closely matched …
View article: Expected Brightness of Ejecta Caused by the DART Impact
Expected Brightness of Ejecta Caused by the DART Impact Open
We estimate the volume of material that could be excavated from asteroid Dimorphos and expelled into the surrounding space by the DART impact on 2022 September 26. What emerges from our computations is that the total volume of ejected mate…
View article: Prepare for Impact!
Prepare for Impact! Open
We model the motion of the WE0913A object based on the latest ephemeris and confirm its impact on the far side of the Moon on 2022 March 4. However, this latest ephemeris suggests that the impact will occur at 12:34 pm (UTC) and will be cl…
View article: Search and study of the space debris and asteroids within ISON project
Search and study of the space debris and asteroids within ISON project Open
International Scientific Optical Network (ISON) is an open international voluntary project specializing in observations of the near-Earth space objects. Observatories collaborating with ISON provide the global coverage and successfully com…
View article: Search and study of the space debris and asteroids within ISON project
Search and study of the space debris and asteroids within ISON project Open
International Scientific Optical Network (ISON) is an open international voluntary project specializing in observations of the near-Earth space objects. Observatories collaborating with ISON provide the global coverage and successfully com…
View article: Resolving color differences of comet 41P/Tuttle-Giacobini-Kresák
Resolving color differences of comet 41P/Tuttle-Giacobini-Kresák Open
Three different measurement campaigns have resulted in three drastically different sets of color measurements of Comet 41P/Tuttle-Giacobini-Kresák, ranging from a strongly red to a strongly blue color. Although the color slope is normalize…
View article: Monitoring polarization in comet 46P/Wirtanen
Monitoring polarization in comet 46P/Wirtanen Open
We measure the degree of linear polarization of comet 46P/Wirtanen during two months, embracing the perihelion passage in 2018 December with phase angles ranging from α = 18.1° to 46.4°. The polarimetric response PQ obtained resembles what…
View article: Rapid variations of dust colour in comet 41P/Tuttle–Giacobini–Kresák
Rapid variations of dust colour in comet 41P/Tuttle–Giacobini–Kresák Open
We monitor the inner coma of comet 41P/Tuttle-Giacobini-Kres\\'{a}k searching\nfor variations of its colour. Fast changes in colour of the comet\n41P/Tuttle-Giacobini-Kres\\'{a}k provide important clues for better\nunderstanding of the mic…
View article: Umov effect in asteroid (3200) Phaethon
Umov effect in asteroid (3200) Phaethon Open
Context. The near-Earth asteroid (3200) Phaethon occasionally reveals a comet-like activity. It is a parent body to the Geminid meteor shower and considered as a target for the space mission called Demonstration and Experiment of Space Tec…