A5043272609- Astro and Planetary Science
- Planetary Science and Exploration
- Stellar, planetary, and galactic studies
- Isotope Analysis in Ecology
- Geological and Geochemical Analysis
- High-pressure geophysics and materials
- Geology and Paleoclimatology Research
- Astrophysics and Star Formation Studies
- Spacecraft and Cryogenic Technologies
- Astrophysics and Cosmic Phenomena
- Integrated Circuits and Semiconductor Failure Analysis
- VLSI and Analog Circuit Testing
- Nuclear physics research studies
- Galaxies: Formation, Evolution, Phenomena
- Cosmology and Gravitation Theories
- Semiconductor materials and devices
Macau University of Science and Technology
2015-2023
Tsinghua University
2017
Purple Mountain Observatory
2013-2017
Space Science Institute
2017
Chinese Academy of Sciences
2014-2015
University of Chinese Academy of Sciences
2014
Hanalei Watershed Hui
2013
We present measurements of the Baryon Acoustic Oscillation (BAO) scale in redshift-space using clustering quasars. consider a sample 147 000 quasars from extended Spectroscopic Survey (eBOSS) distributed over 2044 square degrees with redshifts 0.8 < z 2.2 and measure their spherically averaged both configuration Fourier space. Our observational data set 1400 simulated realizations allow us to detect preference for BAO that is greater than 2.8σ. determine distance = 1.52 3.8 per cent...
On 13 December 2012, Chang'e-2 conducted a successful flyby of the near-Earth asteroid 4179 Toutatis at closest distance 770 ± 120 meters from asteroid's surface. The highest-resolution image, with resolution better than 3 meters, reveals new discoveries on asteroid, e.g., giant basin big end, sharply perpendicular silhouette near neck region, and direct evidence boulders regolith, which suggests that may bear rubble-pile structure. Toutatis' maximum physical length width are (4.75 × 1.95...
In this paper, a 3D convex shape model of (175706) 1996 FG3, which consists 2040 triangle facets and 1022 vertices, is derived from the known light curves. The best-fitting orientation asteroid's spin axis determined to be λ = 237| $_{.}^{\circ}$|7 β −83| $_{.}^{\circ}$|8 considering observation uncertainties, its rotation period ∼3.5935 h. Using model, we adopt so-called advanced thermophysical (ATPM) fit three published sets mid-infrared observations so as evaluate surface properties....
In this work, we investigate the thermophysical properties of OSIRIS-REx target asteroid (101955) Bennu (hereafter Bennu), where thermal inertia plays an important role in understanding nature asteroid's surface, and will definitely provide substantial information for sampling return mission. Using a model incorporating, recently updated 3D radar-derived shape mid-infrared observations Spitzer-PUI, Spitzer-IRAC, Herschel/PACS ESO VLT/VISIR, derive surface Bennu. The has effective diameter...
Abstract We present a high-resolution observation of the distant comet C/2014 UN 271 (Bernardinelli–Bernstein) using Hubble Space Telescope on 2022 January 8. The signal nucleus was successfully isolated by means extraction technique, with an apparent V -band magnitude measured to be 21.65 ± 0.11, corresponding absolute 8.63 0.11. product visual geometric albedo effective radius squared is <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mrow>...
A long-term sublimation model to explain how Phaethon could provide the Geminid stream is proposed. We find that it would take ∼6 Myr or more for lose all of its internal ice (if ever there was) in present orbit. Thus, if asteroid moved from region a 5:2 8:3 mean motion resonance with Jupiter orbit less than 1 ago, may have retained much primordial ice. The dust mantle on sublimating body should thickness at least 15 m but been thick 1000 yr ago. total gas production rate as large...
(349) Dembowska is a large, bright main-belt asteroid that has fast rotation and an oblique spin axis. It might have experienced partial melting differentiation. We constrain Dembowska's thermophysical properties, such as thermal inertia, roughness fraction, geometric albedo effective diameter within 3σ uncertainty of |$\Gamma =20^{+12}_{-7}$| Jm−2 s−0.5 K−1, |$f_{\rm r}=0.25^{+0.60}_{-0.25}$|, |$p_{\rm v}=0.309^{+0.026}_{-0.038}$| |$D_{\rm eff}=155.8^{+7.5}_{-6.2}$| km, by utilizing the...
Abstract 133P/Elst-Pizarro is the first recognized main-belt comet, but we still know little about its nucleus. First use mid-infrared data of Spitzer MIPS, IRS, and Wide-field Infrared Survey Explorer to estimate effective diameter, <?CDATA ${D}_{\mathrm{eff}}={3.9}_{-0.3}^{+0.4}$?> km, geometric albedo, ${p}_{{\rm{v}}}=0.074\pm 0.013$?> , mean Bond albedo ${A}_{\mathrm{eff},{\rm{B}}}=0.024\pm 0.004$?> . The used compute 133P’s temperature distribution, which shows significant seasonal...
We investigate the surface thermophysical properties (thermal emissivity, thermal inertia, roughness fraction and geometric albedo) of asteroid (99942) Apophis, using currently available mid-infrared observations from CanariCam on Gran Telescopio CANARIAS far-infrared data PACS Herschel, based Advanced Thermophysical Model. show that emissivity Apophis should be wavelength dependent 8.70 μm to 160 μm, maximum may appear around 20 similar Vesta. Moreover, we further derive fraction, albedo...
Abstract (704) Interamnia is one of the largest asteroids located in outer main-belt region, which may contain a large amount water ice underneath its surface. We observe this asteroid using 8.2 m Subaru telescope at mid-infrared wave bands and utilize thermophysical model for realistic surface layers to analyze data from along with those IRAS, AKARI, Wide-field Infrared Survey Explorer (WISE)/NEOWISE. optimize method convert WISE magnitude thermal infrared flux temperature-dependent color...
On 13 December 2012, Chang'e-2 completed a successful flyby of the near-Earth asteroid 4179 Toutatis at closest distance 770 meters from asteroid's surface. The observations show that has an irregular surface and its shape resembles ginger-root smaller lobe (head) larger (body). Such bilobate is indicative contact binary origin for Toutatis. In addition, high-resolution images better than 3 provide number new discoveries about this asteroid, such as 800-meter depression end large lobe,...
In this paper, we investigate thermophysical characteristics of near-Earth asteroid (341843) 2008 EV5, based on our improved advanced thermal physical model by considering the contribution sunlight reflection for rough surfaces, along with four waveband observations from Wide-field Infrared Survey Explorer and radar-derived shape model. Here derive that EV5 has a relatively low inertia but high roughness fraction. The geometric albedo effective diameter are then constrained to be ,...
Abstract This work proposes a thermophysical model for realistic surface layers on airless small bodies (RSTPM) the use of interpreting their multiepoch thermal light curves (e.g., WISE/NEOWISE). RSTPM considers real orbital cycle, rotation rough surface, temperature-dependent parameters, as well contributions sunlight reflection to observations. It is thus able produce precise temperature distribution and emission regarding variations timescales. Details physics, mathematics, numerical...
Context. The Yarkovsky effect is a weak non-gravitational force but may significantly affect sub-kilometre-sized near-Earth asteroids. Yarkovsky-related drift be detected, in principle, from astrometric or radar datasets of sufficient duration. To date, the asteroid Kamo’oalewa, most stable Earth’s quasi-satellites, has an ~18 yr-long arc ground-based optical astrometry. These data provide opportunity to detect acting on Kamo’oalewa. Aims. We determined Kamo’oalewa yr Furthermore, we...
Abstract The active asteroid 311P/PanSTARRS is one of the two targets planned Chinese exploration mission Tianwen-2. During 2013, 311P experienced several mass-loss events and exhibited multiple comet-like tails. Here we analyze morphology surface brightness tails to investigate dust environment around nucleus mechanism activities. We enhance features using image processing techniques obtain information about morphologies tails, fit processed images with syndyne–synchrone diagrams. fitting...
Regolith, materials of mixture dusts and boulders, are believed to widely exist on asteroidal surface. However, evidences from recent space missions show that regolith different asteroids can be quite different. There have dominated by fine dust, for example, 433 Eros. also with porous example Ryugu Bennu. Besides, there asteroids, where part the surface covered other regions boulders size porosity, Itokawa.The physical status tell us inforation about origin evolution asteoids. Here we...
Abstract This work presents the data processing, fitting procedure, modeling, and analyzing of 9 yr infrared light curves provided by WISE/NEOWISE telescope, which regolith characteristics Main-belt Object (656) Beagle is studied. locates in Themis family, was proposed to be parent first main-belt comet (MBC) 133P. We determine Beagle’s effective diameter <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mrow> <mml:mi>D</mml:mi> </mml:mrow>...
In this work, we investigate the thermophysical properties, including thermal inertia, roughness fraction and surface grain size of OSIRIS-REx target asteroid (101955) Bennu by using a model with recently updated 3D radar-derived shape (\cite[Nolan et al., 2013]{Nolan2013}) mid-infrared observations (\cite[M$\ddot{u}$ller al, 2012]{Muller2012}, \cite[Emery 2014]{Emery2014}). We find that bears an effective diameter $510^{+6}_{-40}$ m, geometric albedo $0.047^{+0.0083}_{-0.0011}$,...
In order to obtain the substantial information about surface physics and thermal property of target asteroid (162173) 1999 JU3, which will be visited by Hayabusa 2 in a sample return mission, with Advanced Thermal Physical Model (ATPM) we estimate possible inertia distribution over its surface, infer major material composition materials. addition, effective diameter geometric albedo are derived $D_{\rm eff}=1.13\pm0.03\rm~km$, $p_{\rm v}=0.042\pm0.003$, respectively, average is estimated...
Test vehicles are important circuits for process yield learning at early stage. In-house customized standard cell libraries should also be evaluated from the perspective. In this paper, we propose novel logic test to offer high resolution diagnosis capability of in-house designed libraries. Both stuck-at and cell-aware faults injected evaluate diagnosability vehicles. Nearly ideal cell-level results can obtained reflect FEOL/MEOL detractors technology under development. All cells in embedded...