three-dimensional position measurements by global positioning system (gps) provide purely geometrical estimate of low earth orbiters (leos) positions. it provides uninterrupted tracking of the leos in three spatial dimensions or the so-called kinematic orbit. this solution relies heavily on the observations. high frequency observation noise, outlying observations and low redundancy number of me...

Near real-time SAR images are used at DLRs Center for Satellite Based Crisis Information for mapping natural hazards like flood disasters or landslides. In crisis situations a rapid and precise geocoding is mandatory to produce information within several hours that is comparable with other georeferenced information. Unlikely, the orbit information is often not very precisely known some hours af...

Accurate ranges from Earth to the Lunar Reconnaissance Orbiter (LRO) spacecraft Laser Ranging (LR) system supplement the precision orbit determination (POD) of LRO. LRO is tracked by ten LR stations from the International Laser Ranging Service (ILRS), using H-maser, GPS-steered Rb, and Cs oscillators as reference clocks. The LR system routinely makes oneway range measurements via laser time-of-...

Detailed analysis of the one-photon mass-analyzed threshold ionization (MATI) spectrum of CH(2)ClI is presented. This includes the determination of the ionization energy of CH(2)ClI, complete vibrational assignments, and quantum-chemical calculations at the spin-orbit density-functional-theory (SODFT) level with various basis sets. Relativistic effective core potentials with effective spin-orbi...

purpose : fine needle aspiration (fna) cytologic findings of langerhans cell histiocytosis (lch) have been well described, but using this method in the diagnosis of orbital lesions is a recent experience. we hereby report two cases of orbital bone lch diagnosed by fna that later was confirmed by routine h&e; histopathology and immunohistochemistry (ihc) methods. case reports : the first case wa...

follicular thyroid carcinoma (ftc) is the second most common type of thyroid cancer after papillary carcinoma. it usually grows slowly and is clinically indolent; but rarely, its aggressive forms with distant metastases can occur. we report here an uncommon case of bilateral orbital metastasis of ftc. a 70-year-old woman presented with bilateral exophtalmus and past medical history of thyroid n...

All four giant planets in the Solar system possess irregular satellites, characterized by large, highly eccentric and/or inclined orbits that are distinct from the nearly circular, uninclined orbits of the regular satellites. This difference can be traced directly to different modes of formation. Whereas the regular satellites grew by accretion within circumplanetary disks the irregular satelli...

This paper is related to our previous works [1] [2] on the error estimate of the averaging technique, for systems with one fast angular variable. In the cited references, a general method (of mixed analytical and numerical type) has been introduced to obtain precise, fully quantitative estimates on the averaging error. Here, this procedure is applied to the motion of a satellite in a polar orbi...

The problem of finding the eigenvalues and eigenvectors of a matrix referring to an N-sector ring can be reduced to a number of smaller eigenvalue problems in which the dimensions of the vector space are reduced by a factor N. Suppose we need to solve an eigenvalue problem for a matrix A associated with a storage ring, for example in analyzing orbit errors as in Ref.(l}. We number the N superpe...