Ground trajectories of geosynchronous satellites and the analemma

Chalmers, Joseph S.

doi:10.1119/1.15113

Cited by 5 publications

(4 citation statements)

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“…Heath 1923;Raisz 1942;Oliver 1972;di Cicco 1979;Irvine 2001;Holbrow 2013). In addition, the trajectories of geosynchronous satellites as observed from the ground have the appearance of an analemma (Chalmers 1987). From the host, the apparent motion of a quasi-satellite during a sidereal orbital period is not too different from that of true satellites moving in synchronous orbits.…”

Section: Theoretical Expectationsmentioning

confidence: 99%

The analemma criterion: accidental quasi-satellites are indeed true quasi-satellites

Marcos¹,

Marcos²

2016

Mon. Not. R. Astron. Soc.

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In the Solar system, a quasi-satellite is an object that follows a heliocentric path with an orbital period that matches almost exactly with that of a host body (planetary or not). The trajectory is of such nature that, without being gravitationally attached, the value of the angular separation between host and quasi-satellite as seen from the Sun remains confined within relatively narrow limits for time-spans that exceed the length of the host's sidereal orbital period. Here, we show that under these conditions, a quasi-satellite traces an analemma in the sky as observed from the host in a manner similar to that found for geosynchronous orbits. The analemmatic curve (figure-eight-, teardrop-, ellipse-shaped) results from the interplay between the tilt of the rotational axis of the host and the properties of the orbit of the quasi-satellite. The analemma criterion can be applied to identify true quasi-satellite dynamical behaviour using observational or synthetic astrometry and it is tested for several well-documented quasi-satellites. For the particular case of 15810 (1994 JR 1 ), a putative accidental quasi-satellite of dwarf planet Pluto, we show explicitly that this object describes a complex analemmatic curve for several Plutonian sidereal periods, confirming its transient quasi-satellite status.

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Section: Theoretical Expectationsmentioning

confidence: 99%

The analemma criterion: accidental quasi-satellites are indeed true quasi-satellites

Marcos¹,

Marcos²

2016

Mon. Not. R. Astron. Soc.

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“…Applying the coordinate transformations acquires observer elevationazimuth coordinates from a Cartesian coordinate system in the orbital plane. An alternative form of this method was suggested in [2]. A slightly different coordinate system was used and parametric equations were generated.…”

Section: A Sky Studymentioning

confidence: 99%

Spherical antenna design for satellite communications

Burchett

Fredette

Wilson

et al. 2012

2012 15 International Symposium on Antenna Technology and Applied Electromagnetics

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The paper describes a project to determine and model a performance baseline for a satellite communication system concept. It is expected to improve communication capabilities while maintaining low operational cost using a newly proposed antenna system. The system will consist of a large, stationary spherical reflector fed by multiple, steerable feeds. The size of the reflector will improve signal gain and resolvability of individual signals. This paper will use a derivation of far field solutions for spherical shaped current sources. These solutions will be used to look at the interaction between current distributions on the reflector and the resulting EM field distributions. This will allow for estimation of the beam quality of the system as a function of the reflector geometry, and feed illumination. Other methods may be applied as needed to determine the feed systems. This may include ray-tracing code for reflector based systems, and numerical simulations for phased array systems.

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“…The former orbit the Earth at a distance h geo 36 000 km from Earth's surface with a period equal to that of the Earth's rotation (T geo = 23 h 56 min) [8]. This orbit has been first defined in 1945 by Clarke [9] for keeping a satellite over an approximately fixed point from the surface of our planet [10].…”

Section: Meteorology Satellitesmentioning

confidence: 99%

“…The reception technologies, from the antenna to the receiver and the radio-frequency demodulator, as well as the observation methods (prediction of the pass times of moving satellites) are determined by these differences in altitude and behaviour (position fixed in space with respect to ground, or moving) [10].…”

Section: Meteorology Satellitesmentioning

confidence: 99%

Satellite image eavesdropping: a multidisciplinary science education project

Friedt¹

2005

Eur. J. Phys.

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Amateur reception of satellite images gathers a wide number of concepts and technologies which makes it attractive as an educational tool. We here introduce the reception of images emitted from NOAA series low-altitude Earth-orbiting satellites. We tackle various issues including the identification and prediction of the pass time of visible satellites, the building of the radio-frequency receiver and antenna after modelling their radiation pattern, and then the demodulation of the resulting audio signal for finally displaying an image of the Earth as seen from space.

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Ground trajectories of geosynchronous satellites and the analemma

Abstract: Articles you may be interested inTrajectory design for satellite relative angles-only navigation AIP Conf.

Cited by 5 publications

References 0 publications

The analemma criterion: accidental quasi-satellites are indeed true quasi-satellites

The analemma criterion: accidental quasi-satellites are indeed true quasi-satellites

Spherical antenna design for satellite communications

Satellite image eavesdropping: a multidisciplinary science education project

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