Sergey Velichko

Sergey Velichko
V. N. Karazin Kharkiv National University · Department of Astronomy

PhD

About

43
Publications
3,186
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240
Citations
Introduction
Sergey Velichko currently works at the Department of Astronomy, V. N. Karazin Kharkiv National University. Sergey does research in Astronomy, Astrophysics and Observational Astronomy. Their most recent publication is 'The lunar surface around extremely fresh craters'.
Additional affiliations
April 2014 - present
V. N. Karazin Kharkiv National University
Position
  • Researcher
November 2007 - February 2018
National Academy of Sciences of Ukraine
Position
  • Researcher

Publications

Publications (43)
Article
We investigate the influence of the rocket engine jets on the photometric properties of the landing sites of the Soviet sample return missions Luna 16, Luna 20, Luna 23, and Luna 24 using Lunar Reconnaissance Orbiter (LRO) Narrow-Angle Cameras (NACs) data, for which the geometric and photometric topography effects were corrected at the initial spat...
Article
We investigate a southern portion of Mare Vaporum using Chandrayaan-1 M³ images for which we suppress striped noise. Additional data processing allows us to analyze such spectral parameters as the depths and positions of the absorption bands near 1 and 2 μm. Mineral types were mapped using the cluster analysis of Adams diagram for pyroxenes. We ins...
Article
Context. Less than one percent of the discovered small Solar System objects have highly inclined orbits ( i > 60°), and revolve around the Sun on near-polar or retrograde orbits. The origin and evolutionary history of these objects are not yet clear. Aims. In this work we study the surface properties and orbital dynamics of selected high-inclinatio...
Preprint
Full-text available
Less than one percent of the discovered small solar system objects have highly inclined orbits ($i>60^{\circ}$), and revolve around the Sun on near-polar or retrograde orbits. The origin and evolutionary history of these objects are not yet clear. In this work we study the surface properties and orbital dynamics of selected high-inclination objects...
Article
We describe a technique of geometric and photometric corrections of high-resolution LROC NAC data at the level of NAC resolution. The technique does not exploit external DEMs, requiring solely LROC NAC images and LRO SPICE-kernels, i.e. a principle of self-orthorectification is realized. This significantly suppresses the topography influence on pho...
Preprint
Full-text available
We present the first-ever measurements of the surface colors and rotational properties of a recently discovered distant object in an unusual orbit 2016 ND21. In 2017, this object was close to its perihelion, which allowed us to observe it with a 2.0-m telescope at the Peak Terskol observatory. Broadband photometric observations of 2016 ND21 were ca...
Preprint
Full-text available
Aims. We studied the rotational properties of the dwarf planet Makemake. Methods. The photometric observations were carried out at different telescopes between 2006 and 2017. Most of the measurements were acquired in BVRI broad-band filters of a standard Johnson-Cousins photometric system. Results. We found that Makemake rotates more slowly than wa...
Article
Full-text available
We report on the analysis of 34 years of photometric observations of the pulsating helium atmosphere white dwarf GD358. The complete data set includes archival data from 1982 to 2006, and 1195.2 hr of new observations from 2007 to 2016. From this data set, we extract 15 frequencies representing g-mode pulsation modes, adding 4 modes to the 11 modes...
Article
Full-text available
The study of near-Earth space includes the detection and investigation of an increasing number of space debris objects by ground-based optical telescopes. There is no natural cleansing of space in the geostationary region. The telescope Zeiss-2000 with a two-meter aperture of the Terskol observatory is the largest optical instrument regularly used...
Preprint
We report on the analysis of 34 years of photometric observations of the pulsating helium atmosphere white dwarf GD358. The complete data set includes archival data from 1982-2006, and 1195.2 hours of new observations from 2007- 2016. From this data set, we extract 15 frequencies representing g-mode pulsation modes, adding 4 modes to the 11 modes k...
Article
Full-text available
During the period from September 2011 to February 2012, photometric observations of comet C/2009 P1 (Garradd) were performed on the 0.6-m telescope MC AMED at the peak Terskol (North-Caucasus). The paper presents an analysis of photometric observations of Comet C/2009 P1 (Garradd) obtained for heliocentric distances of 2.0-2.1 au before and 1.7-1....
Article
The physical parameters of selected comets of the Jupiter family (22P/Kopff, 81P/Wild 2, 103P/Hartley 2) and the long-period comets with retrograde motion C/2006 W3 (Christensen), C/2009 K5 (McNaught), C/2009 P1 (Garradd) were obtained on the basis of optical spectra with resolution ((λ/Δλ) = 1500 and (λ/Δλ) = 14000). The spectra of comets were obt...
Article
Full-text available
In this work, we present transit timing variations detected for the exoplanet TrES-5b. To obtain the necessary amount of photometric data for this exoplanet, we have organized an international campaign to search for exoplanets based on the Transit Timing Variation method (TTV) and as a result of this we collected 30 new light curves, 15 light curve...
Preprint
Full-text available
In this work, we present transit timing variations detected for the exoplanet TrES-5b. To obtain the necessary amount of photometric data for this exoplanet, we have organized an international campaign to search for exoplanets based on the Transit Timing Variation method (TTV) and as a result of this we collected 30 new light curves, 15 light curve...
Article
We investigate surface changes near two lunar craters formed on March 17 and September 11, 2003, using high-resolution imagery data (0.5 m/pixel) of the LRO narrow angle camera. The phase- and temporal ratio techniques are applied. Using these techniques reveals a slight “butterfly-wings” pattern around the March 17 crater. This pattern is not seen...
Article
Full-text available
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 a...
Article
Full-text available
Context. Long period distant comet C/2006 W3 (Christensen) was discovered in 2006 and passed perihelion at 3.13 au in July 2009. It was a target for the Herschel Space Observatory, Spitzer Space Telescope, and ground-based radio telescopes. We enlarge the observational database with optical spectrophotometric ground base data. Aims. We performed op...
Article
Full-text available
Context. The study of small bodies that have a cometary activity at a large heliocentric distance (larger than 5 au) is important for a better understanding of the physical properties of comets and their origin. Such studies require long-term monitoring and a significant observational effort. Aims. Our goal is to monitor the cometary activity and s...
Conference Paper
Full-text available
Photometry and polarimetry of largest NEA 1036 Ganymed in 2011 May-June and August-December were carried out at phase angle ranging from 1.3° to 52.6°.
Article
Full-text available
Results of narrow-band continuum polarimetry of the comets C/2007 W1 (Boattini), C/2007 N3 (Lulin) and VR-polarimetry of C/2001 Q4 (NEAT), C/2003 K4 (LINEAR), C/2006 M4 (SWAN), and C/2007 F1 (LONEOS) which were obtained in 2004--2009 are presented.
Article
The spectroscopic observations of comet C/2009 R1 (McNaught) were carried out with the 2m Zeiss-RCC Telescope of Pik Terskol Observatory operated by the International Center for Astronomical and Medico-Ecological Research (Ukraine, Russia). The Multi Mode Cassegrain spectrometer was used to obtain spectra of moderate spectral resolving power with a...
Article
Full-text available
Earth- and space-based observations provide synergistic information for space mission encounters by providing data over longer timescales, at different wavelengths and using techniques that are impossible with an in situ flyby. We report here such observations in support of the EPOXI spacecraft flyby of comet 103P/Hartley 2. The nucleus is small an...
Article
Full-text available
This dataset presents a collection of 2334 published and 319 unpublished results in cometary polarimetry. The database contains 2653 measurements of linear and circular polarization for 58 comets since 1940. The narrow-band and broad-band measurements within the spectral region 0.3-3.5 micron are presented. The ranges of phase angles, helio- and ge...
Article
We present results of polarimetric observations of comet 17P/Holmes that in 2007 surprised the observers by its outburst that resulted in dramatically increased brightness and unusual shape of the coma. Polarimetric properties of the comet also appeared to be very peculiar. Even though the comet showed negative polarization typical for the small ph...
Article
Available from the Minor Planet Center.
Article
Available from the Minor Planet Center.
Article
We present the results of polarimetric and photometric observations of dynamically new comet C/2002 T7 (LINEAR) at phase angles from 6° to 26°. During the observations, the comet was at a distance of 2.7–1.3 AU from the Sun and 1.7–2.0 AU from the Earth. The aperture polarimetry was made with the 2.6-m Shain telescope and the 1.25-m AZT-11 telescop...
Article
Full-text available
We present the electronic database (EAR-C-COMPIL-5-DB-COMET-POLARIMETRY-V1.0, NASA Planetary Data System) involving published and some unpublished results of cometary polarimetry. The database contains more than 2600 measurements of linear and circular polarization for 64 comets since 1940s. The narrow-band and wide-band measurements within the spe...
Article
Full-text available
We present results of polarimetry and photometry of comet C/2004 Q2 (Machholz) obtained with the 0.7-m telescope of Institute of Astronomy at the Karazin Kharkiv National University on February 3 and 4, and March 4 and 14, 2005. The observations were carried out with a one-channel photoelectric photometer-polarimeter. The IHW continuum UC (λ3650/80...
Article
Full-text available
We present the results of polarimetric and photometricobservations of split Comet C/2001 A2 (LINEAR), which wereobtained at the 70-cm telescope of the Astronomical Observatoryof Kharkiv National University between 30 June and 31 July 2001.The brightest fragment of the comet, nucleus B, was observed.Eight narrowband cometary filters in the continuum...

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