Results 11 to 20 of about 168,570 (264)
A Fast Star-Detection Algorithm under Stray-Light Interference
Photonics, 2023 The interference caused by stray light leads to the invalid attitude of star sensors in orbit, thus affecting the attitude control of satellites. In order to overcome this problem, this paper proposes a fast star-detection algorithm with strong stray ...
Kaili Lu +5 more
doaj +3 more sources
Fast and robust star detection algorithm based on the dyadic wavelet transform
IET Image Processing, 2023 Star detection is an important part of the spacecraft attitude determination performed by star trackers. The current advanced star detection algorithms can effectively extract star points in complex backgrounds.
Zhanglei Chen +3 more
doaj +2 more sources
IEEE Access, 2019 Extracting accurate star centroids in the observed star images is one of the key problems for image navigation of the geosynchronous interferometric infrared sounder (GIIRS) of Fengyun-4A Satellite (FY-4A), the first scientific experimental satellite of ...
Haopeng Zhang +8 more
doaj +3 more sources
Accurate Star Centroid Detection for the Advanced Geosynchronous Radiation Imager of Fengyun-4A
IEEE Access, 2018 Star observation can be used for the image navigation of certain instruments aboard the three-axis stabilized geostationary satellites. How to extract the accurate star centroids in the observed star images is one of the key problems.
Haopeng Zhang +8 more
doaj +3 more sources
A Curvature-Based Multidirectional Local Contrast Method for Star Detection of a Star Sensor
Photonics, 2021 Stray light, such as sunlight, moonlight, and earth-atmosphere light, can bring about light spots in backgrounds, and it affects the star detection of star sensors.
Kaili Lu +5 more
doaj +1 more source
Detecting primordial stars [PDF]
New Astronomy Reviews, 2006 We study the detectability of primordial metal-free stars. Cosmological enrichment is a local process that takes place over an extended redshift range. While the duration of this transition depends on several unknown factors, in all cases late-forming metal-free stars are found in ~ 10^8 solar mass objects, which are just large enough to cool, but ...
Scannapieco, Evan +5 more
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Detectability of Bulge stars [PDF]
Symposium - International Astronomical Union, 1993 Classification algorithms based on neural network techniques are applied to study if the bulge stars can be differentiated from other stars belonging to other Galactic components. A synthetic sample is build as a mixture of four components, thin disk, thick disk, halo and bulge, according to some stellar system models and considering observational ...
M. Hernandez-Pajares +3 more
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On the Detection of Supermassive Primordial Stars [PDF]
The Astrophysical Journal Letters, 2018 Abstract The collapse of supermassive primordial stars in hot, atomically cooled halos may have given birth to the first quasars at z ∼ 15–20. Recent numerical simulations of these rapidly accreting stars reveal that they are cool, red hypergiants shrouded by dense envelopes of pristine atomically cooled gas at 6000–8000 K, with ...
Marco Surace +8 more
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Research on the Detection Method of Projection Stellar Target Simulator
Photonics, 2023 The projection stellar target simulator is a stellar target simulator in which star points are projected to be imaged on a fixed plane at a fixed distance.
Jianan Kang +4 more
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ON THE DETECTABILITY OF STAR-PLANET INTERACTION [PDF]
The Astrophysical Journal, 2012 Magnetic (or tidal) interactions between "hot Jupiters" and their host stars can potentially enhance chromospheric and coronal activity. An ideal testbed for investigating this effect is provided by the extreme WASP-18 system, which features a massive (~10 times Jupiter) close-in (~1 day period) transiting planet orbiting a young F6 star. Optical and X-
Miller, Brendan P. +3 more
openaire +3 more sources