Vasilij G. Shevchenko
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Vasilij G. Shevchenko (born 1960) is a Ukrainian astronomer, specialist in
asteroid An asteroid is a minor planet of the inner Solar System. Sizes and shapes of asteroids vary significantly, ranging from 1-meter rocks to a dwarf planet almost 1000 km in diameter; they are rocky, metallic or icy bodies with no atmosphere. ...
photometry Photometry can refer to: * Photometry (optics), the science of measurement of visible light in terms of its perceived brightness to human vision * Photometry (astronomy), the measurement of the flux or intensity of an astronomical object's electrom ...
, professor at the Department of Astronomy and Space Informatics of
Kharkiv University The Kharkiv University or Karazin University ( uk, Каразінський університет), or officially V. N. Karazin Kharkiv National University ( uk, Харківський національний університет імені ...
. In 2012, he was awarded M. P. Barabashov Prize, the principal prize of the
National Academy of Sciences of Ukraine The National Academy of Sciences of Ukraine (NASU; uk, Національна академія наук України, ''Natsional’na akademiya nauk Ukrayiny'', abbr: NAN Ukraine) is a self-governing state-funded organization in Ukraine th ...
for
Solar System The Solar SystemCapitalization of the name varies. The International Astronomical Union, the authoritative body regarding astronomical nomenclature, specifies capitalizing the names of all individual astronomical objects but uses mixed "Solar S ...
research.Постанова НАНУ «Про присудження Національною академією наук України премій імені видатних учених України за підсумками конкурсу 2012 р.»
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Biography

Shevchenko was born on October 15, 1960, in the village Novomutyn in the
Sumy Oblast Sumy Oblast ( uk, Сумська́ о́бласть, translit=Sumska oblast; also referred to as Sumshchyna – uk, Су́мщина) is an oblast (province) in the northeastern part of Ukraine. Population: The oblast was created in its most r ...
. In 1982, he graduated from the School of Physics Department of A. M. Gorky Kharkiv State University (now
V. N. Karazin Kharkiv National University The Kharkiv University or Karazin University ( uk, Каразінський університет), or officially V. N. Karazin Kharkiv National University ( uk, Харківський національний університет імені ...
). After university, he served 2 years as an officer in the air defense forces (1982-1984). Since then, he has been working at the Kharkiv Observatory as a junior researcher (1985-1992), a PhD student (1992-1996), a researcher (1996-1998), and a senior researcher (since 1998).Vasilij G. Shevchenko
Institute of Astronomy of Kharkiv National University
In 1997, he defended his PhD thesis "Asteroid photometry: phase dependencies of brightness, photometric model".
Фізичний факультет Харківського національного університету
In 2017, he defended his doctoral dissertation "Integral photometry of asteroids: observation and numerical modeling". Since 2006, he has been teaching at the Department of Astronomy of Kharkiv University as an Associate Professor (2006-2018) and Professor (since 2018). He conducts courses "Planetary Physics", "Practical Astrophysics", "Problems of Modern Astrophysics", "Computer Technologies", conducts astrophysical practice at Chuhuiv Observational Station Member of the
International Astronomical Union The International Astronomical Union (IAU; french: link=yes, Union astronomique internationale, UAI) is a nongovernmental organisation with the objective of advancing astronomy in all aspects, including promoting astronomical research, outreac ...
and the European Astronomical Society.


Scientific results

Shevchenko's main contributions are studies of the phase dependence of the brightness and the
opposition effect The opposition surge (sometimes known as the opposition effect, opposition spike or Seeliger effect) is the brightening of a rough surface, or an object with many particles, when illuminated from directly behind the observer. The term is most wid ...
of asteroids. Based on the results of photometric observations, he determined the
phase function In astronomy a phase curve describes the brightness of a reflecting body as a function of its phase angle. The brightness usually refers the object's absolute magnitude, which, in turn, is its apparent magnitude at a distance of astronomical unit ...
s for different types of asteroids, studied the
opposition effect The opposition surge (sometimes known as the opposition effect, opposition spike or Seeliger effect) is the brightening of a rough surface, or an object with many particles, when illuminated from directly behind the observer. The term is most wid ...
up to extremely small phase angles (less than 1 degree), found some dark asteroids without an opposition effect, and determined the exact
albedo Albedo (; ) is the measure of the diffuse reflection of sunlight, solar radiation out of the total solar radiation and measured on a scale from 0, corresponding to a black body that absorbs all incident radiation, to 1, corresponding to a body ...
for dozens of asteroids. Shevchenko proposed an analytical expression for the phase function of asteroids. He established a strong correlation between the asteroid's albedo and the slope of the phase dependence, which can be used to determine the albedo.Li J.-Y., Helfenstein P., Buratti B. J., Takir D., and Clark B. E. (2015) Asteroid photometry. In Asteroids IV (P. Michel et al., eds.), pp. 129—150. Univ. of Arizona, Tucson, DOI: 10.2458/azu_uapress_9780816532131-ch007. With Shevchenko's participation, satellites of several asteroids and several
variable star A variable star is a star whose brightness as seen from Earth (its apparent magnitude) changes with time. This variation may be caused by a change in emitted light or by something partly blocking the light, so variable stars are classified as ...
s were discovered.


Honours and awards

* M. P. Barabashov Prize of the
National Academy of Sciences of Ukraine The National Academy of Sciences of Ukraine (NASU; uk, Національна академія наук України, ''Natsional’na akademiya nauk Ukrayiny'', abbr: NAN Ukraine) is a self-governing state-funded organization in Ukraine th ...
(2012). * The asteroid 17034 Vasylshev is named after Vasilij Shevchenko. In the nomination for the asteroid name, it was noted that Vasilij Shevchenko "is the most productive observer of the magnitude-phase dependence and opposition effect for minor planets. He was one of the first to show that the amplitude of the opposition effect depends on taxonomic class".17034 Vasylshev (1999 FS9)
JPL Small-Body Database Browser


References


Sources



Фізичний факультет Харківського національного університету
Vasilij G. Shevchenko
Institute of Astronomy of Kharkiv National University
Shevchenko, V. G.
in
Scopus Scopus is Elsevier's abstract and citation database launched in 2004. Scopus covers nearly 36,377 titles (22,794 active titles and 13,583 inactive titles) from approximately 11,678 publishers, of which 34,346 are peer-reviewed journals in top-l ...
* {{DEFAULTSORT:Shevchenko, Vasilij 1960 births Ukrainian astronomers National University of Kharkiv alumni People from Sumy Oblast Living people Academic staff of Kharkiv Observatory