Search Publications
Tianyu-Search for the Second Solar System and Explore the Dynamic Univers
Shi, X.; Yang, M.; Lin, J. +32 more
Giant planets like Jupiter and Saturn, play important roles in the formation and habitability of Earth-like planets. The detection of solar system analogs that have multiple cold giant planets is essential for our understanding of planet habitability and planet formation. Although transit surveys such as Kepler and Transiting Exoplanet Survey Sate…
Large-scale CO Multi-line Observations of the S187 HII Region
Chen, X. P.; Sun, Y.; Xu, X. Y. +1 more
The strong feedback of massive stars profoundly affects the interstellar medium around them, and may trigger the formation of next-generation stars. S187 is a massive star formation region located in the second quadrant of the Milky Way, showing a ``Collect and Collapse" triggered star formation pattern. Based on the $^{12}\mathrm{CO}$/$^{13}\math…
Water Ice Sublimation Distribution on the Surface of Short Period Comet
Li, C.; Zhao, Y. H.; Ji, J. H.
Comets are the primitive planetesimals left in the solar system. Studying the evolution of comet nucleus is of great significance for understanding the formation and evolution history of other celestial bodies in the solar system. Under the action of solar radiation, the volatile components of comets sublimate and drive the dust movement, resultin…
Astrometry of Cassini ISS Images of 7 Near-ring Inner Satellites of Saturn Affected by Scattered Light
Li, Y.; Li, Z.; Wang, Z. Q. +4 more
The Imaging Science Subsystem (ISS) mounted on Cassini spacecraft took images of Saturn's inner satellites between 2004 and 2017. In some of these images, the satellites are so close to Saturn rings that their images are affected by the scattered light from Saturn rings, which results in poor, even impossible, measurements of targets. A background…
A Re-examination of the Star Observation in Early Ming Dynasty Based on the Star Catalogue of \textit{Datong Tongzhan}-with Discussion on the Changes of Traditional Chinese Constellations
Chu, L. F.; Yang, B. S.
\textit{Datong Tongzhan} is a divination book compiled by the Imperial Board of Astronomy in early Ming dynasty, which preserves some positional data of stars observed at that time. Based on this star catalogue, a further research is carried out on star observation in early Ming dynasty. Firstly, through a deep analysis, it is found that this book…
Multi-wavelength and Multi-perspective Studies of Coronal Mass Ejections and Their Driven Shocks
Ying, B. L.
Coronal Mass Ejections (CMEs) are one of the most fierce explosion phenomena in the solar atmosphere. CMEs usually release a large amount of energy and eject massive magnetized plasma. CME-driven shocks can further lead to solar energetic particle (SEP) events and affect the safety of spacecraft and astronauts. Therefore, researches on CME initiat…
Multi-star System Observations Based on the Direct-imaging Method
Zhao, G.; Chen, Y. L.; Zhu, Y. T. +1 more
The direct-imaging exploration can obtain comprehensive physical information of exoplanets, which is a key technology to search for extraterrestrial life in the future. In this paper, based on our recent high-contrast imaging data of ground-based telescope, the newly discovered multi-star candidates are presented. In the early stage, combined with…
Overall Properties of the ICRF and Gaia-CRF
Liu, N.
The International Celestial Reference System (ICRS) now has realizations at several frequencies, all with an accuracy of several tens of mircoarcsecond (µas) level, including the International Celestial Reference Frame (ICRF) based on observations of the very long baseline interferometry (VLBI) at S/X, K, and X/Ka band, and the Gaia celestia…
Formation Mechanism of Contact Binary Asteroid (4179) Toutatis
Hu, S. C.
Contact binary asteroids are a kind of single asteroids with bifurcated (or bi-lobed) configurations. Ground-based radar observations have shown that about 14% of near-Earth asteroids larger than 200 meters in diameter may be contact binaries. Specially, the targets of the three minor planet missions, Hayabusa, Chang'e-2, and Rosetta, have contact…
Experimental CCD Positional Observations of the Five Major Uranian Satellites
Wang, N.; Peng, Q. Y.; Xie, H. J. +1 more
Two hundred and forty-eight CCD frames, observed by using 1 m telescope at Yunnan Observatories for four consecutive nights, have been reduced to derive the precise positions of the five Uranian major satellites (Ariel, Umbriel, Titania, Oberon, and Miranda). The positions of satellites are measured with respect to the stars in Gaia DR1 (Data Rele…