Telescopes mounted with polarizers can study the neutral points of the Earth's atmosphere,
the solar corona, the surface of planets/moons of the Solar system, distant stars, galaxies …

We summarize unique aperture data on the degree of linear polarization observed for
distant comets C/2010 S1, C/2010 R1, C/2011 KP36, C/2012 J1, C/2013 V4, and C/2014 A4 …

Context. The study of distant comets, which are active at large heliocentric distances, is
important for a better understanding of their physical properties and mechanisms of long …

We present the results of imaging photometric and long-slit spectroscopic observations of
comet 2P/Encke performed at the heliocentric distance r= 0.56 au, geocentric distance Δ …

This paper presents a new method of determining the brightness and size of cometary nuclei
that has been applied to the following 32 observed comets: 2P/Encke, 29P/Schwassmann …

We analyzed the BVR photometry of comet C/2012 J1 (Catalina) taken between March 2013
and May 2014 with telescopes ranging from 0.20 to 2.0 m aperture in Australia, Europe, and …

We present results of imaging polarimetry of comet 2P/Encke performed on January 23,
2017 at the heliocentric (1.052 au) and geocentric (1.336 au) distances and phase angle …

In this chapter, we deal with the following astropolarization studies: Sky-polarimetric
corroboration of the resolution of the UV-sky-pol paradox of insect celestial polarization …

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 …

In 1767 Euler discovered three unstable collinear points (L1, L2, L3) and in 1772 Lagrange
found two triangular points (L4, L5) in the gravitational field of two bodies moving under the …