Recently, Formation Flying of satellites has been recognized as an important future on-orbit technology. It has much potential such as leading to flexibility of space mission, low cost, etc. However, conventional thrusters consume propellant fuel, which leads to high cost, high weight and restricted mission life-time. Consequently, magnetic force, which doesn’t consume fuel, is widely focused t...

Mutant knots, in the sense of Conway, are known to share the same Homfly polynomial. Their 2-string satellites also share the same Homfly polynomial, but in general their m-string satellites can have different Homfly polynomials for m > 2. We show that, under conditions of extra symmetry on the constituent 2-tangles, the directed m-string satellites of mutants share the same Homfly polynomial f...

We have been conducting spectroscopic observations of satellites in addition to photometric observations since last summer at the Kyung-Hee Optical Satellite Observation and Tracking Facility (KOSOTF). We began with observing slowly moving objects, such as geo-stationary satellites. We have undergone many trials and errors to succeed in the spectroscopic observations of these satellites. Necess...

NASA's Galileo mission to Jupiter and improved Earth-based observing capabilities have allowed major advances in our understanding of Jupiter's moons Io, Europa, Ganymede, and Callisto over the past few years. Particularly exciting findings include the evidence for internal liquid water oceans in Callisto and Europa, detection of a strong intrinsic magnetic field within Ganymede, discovery of h...

To the assessment of satellite’s capabilities during their progress can be added indices as mass, size and cost. At the final stages of their life-cycle development, owing to the progress in current space technologies, the idea for using small satellites is approved. The small satellites are specified as workefficient, productive and promising. The estimation and the choice ensue from economic ...

Every day new ICT (information and communication technology) appliances find their way into our work, public, domestic and personal spaces [9,19]. While such new technologies may allow us to move beyond physical limitations such as time and distance, the interfaces and physical manifestations of these appliances are becoming increasingly important. Where these various elements meet, interesting...

All studies of peer-to-peer (henceforth abbreviated as P2P) satellite refueling so far assume that all active satellites return back to their original orbital positions after undergoing fuel exchanges with the passive satellites. In this paper, we remove this restriction on the active satellites, namely, we allow the active satellites to interchange orbital slots during the return trips. We for...

The data exploitation system described within is being designed to take advantage of the existence of terabytes (or more) of data sets that have been sent down from various Air Force satellites that can be used to detect previously unknown anomalies that occurred while the satellites were operational. This wealth of information can then be used and exploited to build more reliable and robust fu...

One of the most important factors affecting the precision of the performance of a GPS receiver is the relative positioning of satellites to each other. Therefore, it is essential to choose appropriate accessible satellites utilized in the calculation of GPS positions. Optimal subsets of satellites are determined using the least value of their Geometric Dilution of Precision (GDOP). The most cor...

We conduct a systematic survey of the regions in which distant satellites can orbit stably around the four giant planets in the solar system, using orbital integrations of up to 109 yr. In contrast to previous investigations, we use a grid of initial conditions on a surface of section to explore phase space uniformly inside and outside the planet’s Hill sphere (radius rH; satellites outside the...