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RISS 인기검색어
- 검색키워드
- 저자 : Ulkar Karimova (검색결과 3 건)
- 무료
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SOHO sungrazing comet groups classified by the scatterplot matrix
Karimova Ulkar,Yi Yu 한국물리학회 2023 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.83 No.9
Over the years, the launch of the SOHO/LASCO instrument has facilitated the accumulation of a wealth of data on sungrazing comets. These comets are extraordinary celestial objects that navigate a parabolic trajectory, mostly evaporating or experiencing an extreme fragmentation while venturing daringly close to the distance of our Sun. Leveraging this extensive dataset, our study focuses on exploring the relationships between diferent groups of these comets. By employing various analytical methods, including the utilization of scatterplot matrix visualizations, and the 3D trajectory visualization tools we specifcally investigate the distribution of perihelion distances and other relevant orbital parameters. Through our analysis, we achieve accurate visualization of all available orbital parameters, redefne the groups by new classifcation method, and gain a comprehensive understanding of the spatial distribution within the sungrazing comet dataset. Our fndings highlight the efectiveness of the scatterplot matrix approach in efectively grouping sungrazing comets based on their orbital parameters.
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Ulkar Karimova,YU YI 한국우주과학회 2024 Journal of Astronomy and Space Sciences Vol.41 No.1
Sungrazing comets, known for their proximity to the Sun, are traditionally classified into broad groups like Kreutz, Marsden, Kracht, Meyer, and non-group comets. While existing methods successfully categorize these groups, finer distinctions within the Kreutz subgroup remain a challenge. In this study, we introduce an automated classification technique using the densitybased spatial clustering of applications with noise (DBSCAN) algorithm to categorize sungrazing comets. Our method extends traditional classifications by finely categorizing the Kreutz subgroup into four distinct subgroups based on a comprehensive range of orbital parameters, providing critical insights into the origins and dynamics of these comets. Corroborative analyses validate the accuracy and effectiveness of our method, offering a more efficient framework for understanding the categorization of sungrazing comets.
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The differences in Constellation drawings among different countries
이유,오수연,Karimova, Ulkar,Yi, Yu,Oh, Suyeon 한국천문학회 2012 天文學會報 Vol.37 No.2
Constellations are formed of bright stars which appear close to each other on the sky, but are really far apart in space. The shapes you see all depend on your point of view. Back before people had televisions and electricity to light their homes at night, they spent a lot more time looking at the stars. People all over the world used their imaginations to draw pictures in the sky, as if it were a giant connect-the-dot game. The patterns they imagined are called constellations. People usually saw patterns that reflected their different cultures. Native Americans in North America imagined many animals and shapes from the natural world. The ancient Greeks found images of gods and goddesses in the stars. Sometimes people from very different parts of the world even imagined the same animal or shape in the same stars. Most of the constellations we recognize today were made up by the ancient Greeks around 6,000 years ago. Different constellations are visible at different times of year, so the first appearance of these patterns told farmers of the changing seasons and reminded them to plant or harvest their crops. The constellations also help us to find our way around the night sky and to remember which stars are which. The star names we use today are mostly from Greek and Arabic, but many are changed a bit from the original, as often happens when words are passed from one language to another. It can be difficult to picture just what those folks long ago were seeing in the stars, so don't be discouraged if you have trouble seeing their patterns. You can even make up your own! In ancient world all the countries or regions had their own way to name things up in the sky, make up stories and draw different shapes for constellations. Today there are 88 official constellations, but you may find that different books show their stars connected in slightly different ways. The official constellations are specific regions of the sky, so the exact patterns are not all that important. However in various cultures there are some famous star patterns that use stars from only apart of a constellation, or even connect stars from different constellations. These patterns of stars that are not official constellations are called asterisms. The Big Dipper is a very famous asterism, found in the constellation Ursa Major, or Great Bear.
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