Results 31 to 40 of about 143,162 (326)
Discovery of an M4 Spectroscopic Binary in Upper Scorpius: A Calibration Point for Young Low-Mass Evolutionary Models [PDF]
, 2005 We report the discovery of a new low-mass spectroscopic (SB2) stellar binary system in the star-forming region of Upper Scorpius. This object, UScoCTIO5, was discovered by Ardila (2000), who assigned it a spectral class of M4.
Ansgar Reiners +4 more
core +1 more source
Bistatic Radar Observations Correlation of LEO Satellites Considering J2 Perturbation
Mathematics, 2022 Space debris near Earth severely interferes with the development of space, and cataloging space objects is increasingly important. Since optical telescopes and radars used to detect space debris only provide short-arc observations, mathematical ...
Zongbo Huyan +4 more
doaj +1 more source
A differential algebra based importance sampling method for impact probability computation on Earth resonant returns of Near Earth Objects [PDF]
, 2018 A differential algebra based importance sampling method for uncertainty propagation and impact probability computation on the first resonant returns of Near Earth Objects is presented in this paper.
Armellin, Roberto +3 more
core +2 more sources
Geostationary Orbit Surveillance Using the Unscented Kalman Filter and the Analytical Orbit Model [PDF]
Journal of Astronomy and Space Sciences, 2011 A strategy for geostationary orbit (or geostationary earth orbit [GEO]) surveillance based on optical angular observations is presented in this study. For the dynamic model, precise analytical orbit model developed by Lee et al.
Kyoung-Min Roh +2 more
doaj +1 more source
Aerospace, 2021 For Geosynchronous Earth Orbit (GEO) objects, space-based optical surveillance has advantages over regional ground surveillance in terms of both the timeliness and space coverage.
Jian Huang +6 more
doaj +1 more source
International Journal of Aerospace Engineering, 2016 The accuracy of autonomous orbit determination of Lagrangian navigation constellation will affect the navigation accuracy for the deep space probes. Because of the special dynamical characteristics of Lagrangian navigation satellite, the error caused by ...
Youtao Gao +3 more
doaj +1 more source
Initial Orbit Determination from Only Heading Measurements
Journal of Spacecraft and Rockets, 2023 This work introduces the problem of initial orbit determination (IOD) from only heading measurements. Such a problem occurs in practice when estimating the orbit of a spacecraft using visual odometry measurements from an optical camera. After reviewing the problem geometry, a simple solution is developed in the form of an iterative scheme on the ...
openaire +2 more sources
A More Reliable Orbit Initialization Method for LEO Precise Orbit Determination Using GNSS [PDF]
Remote Sensing, 2020 Precise orbit determination (POD) using GNSS has been rapidly developed and is the mainstream technology for the navigation of low Earth orbit (LEO) satellites. The initialization of orbit parameters is a key prerequisite for LEO POD processing. For a LEO satellite equipped with a GNSS receiver, sufficient discrete kinematic positions can be obtained ...
Gong, Xuewen +3 more
openaire +2 more sources
Shadowing Lemma and Chaotic Orbit Determination
, 2015 Orbit determination is possible for a chaotic orbit of a dynamical system, given a finite set of observations, provided the initial conditions are at the central time.
Milani, Andrea, Spoto, Federica
core +1 more source
Remote Sensing, 2019 In order to provide better service for the Asia-Pacific region, the BeiDou navigation satellite system (BDS) is designed as a constellation containing medium earth orbit (MEO), geostationary earth orbit (GEO), and inclined geosynchronous orbit (IGSO ...
Zhiwei Qin +7 more
doaj +1 more source