scholarly journals Development of the lunar and solar disturbing functions for a close satellite

1962 ◽  
Vol 67 ◽  
pp. 300 ◽  
Author(s):  
William M. Kaula
Keyword(s):  
Close Satellite

The motion of a lunar orbiter

1966 ◽  
Vol 25 ◽  
pp. 373
Author(s):  
Y. Kozai
Keyword(s):  
Degrees Of Freedom ◽  
Dimensional Space ◽  
Artificial Satellite ◽  
Equations Of Motion ◽  
Triaxial Ellipsoid ◽  
The Moon ◽  
Secular Motion ◽  
The Earth ◽  
Close Satellite ◽  
The Mean

The motion of an artificial satellite around the Moon is much more complicated than that around the Earth, since the shape of the Moon is a triaxial ellipsoid and the effect of the Earth on the motion is very important even for a very close satellite.The differential equations of motion of the satellite are written in canonical form of three degrees of freedom with time depending Hamiltonian. By eliminating short-periodic terms depending on the mean longitude of the satellite and by assuming that the Earth is moving on the lunar equator, however, the equations are reduced to those of two degrees of freedom with an energy integral.Since the mean motion of the Earth around the Moon is more rapid than the secular motion of the argument of pericentre of the satellite by a factor of one order, the terms depending on the longitude of the Earth can be eliminated, and the degree of freedom is reduced to one.Then the motion can be discussed by drawing equi-energy curves in two-dimensional space. According to these figures satellites with high inclination have large possibilities of falling down to the lunar surface even if the initial eccentricities are very small.The principal properties of the motion are not changed even if plausible values ofJ3andJ4of the Moon are included.This paper has been published in Publ. astr. Soc.Japan15, 301, 1963.

Effect of the Rotation of a Planetary Atmosphere Upon the Orbit of a Close Satellite

ARS Journal ◽  
1959 ◽  
Vol 29 (10) ◽  
pp. 777-782 ◽  
Author(s):  
THEODORE E. STERNE
Keyword(s):  
Planetary Atmosphere ◽  
Close Satellite

Analog Computer Solution of the Orbital Flight Equations

SIMULATION ◽  
1963 ◽  
Vol 1 (1) ◽  
pp. R-41-R-48 ◽  
Author(s):  
L.E. Fogarty ◽  
R.M. Howe
Keyword(s):  
Analog Computer ◽  
Accurate Solution ◽  
Fast Time ◽  
Computer Solution ◽  
Orbital Flight ◽  
Close Satellite ◽  
Control Forces ◽  
Six Degree Of Freedom ◽  
And Control ◽  
Differential Analyzer

A modified flight-path axis system is introduced to simplify computer mechanization of the orbital flight equations. Complete six degree-of-freedom equa tions are presented, including aerodynamic, power- plant, and control forces. Electronic differential analyzer mechanization of these equations in both real and fast time is described, including a novel technique for division which preserves favorable multiplier scaling. Specific machine results are presented which demonstrate accurate solution of close-satellite tra jectories, including re-entry from satellite altitudes to sea level. With no change in circuit or scaling the same computer mechanization yields zero-drag orbits which close within several hundred feet of altitude.

scholarly journals Critical Remarks on the Possibility of Determining Variations of the Geocenter Position Using Geostationary Satellite Observations

1980 ◽  
Vol 56 ◽  
pp. 251-253
Author(s):  
J. Klokoĉník ◽  
J. Kostelecký
Keyword(s):  
Satellite Observations ◽  
Libration Points ◽  
Satellite Orbits ◽  
Resonant Phenomenon ◽  
Geostationary Satellites ◽  
High Magnitude ◽  
Close Satellite ◽  
The Difference ◽  
Geopotential Harmonic Coefficients

AbstractThe possibility of determining the variations of the Earth’s cejiter (expressed in terms of the geopotential harmonic coefficients , , or of some functions of them), using geostationary satellites, was discussed by Burŝa and Ŝíma (1978) after discerning the difference between observed and theoretical positions of libration points. Although their effect on geostationary orbits cannot be expected to be of high magnitude, the question of determination of these terms arose. It was suggested that the “resonant phenomenon” observed here might be analogous to the resonant effects in close satellite orbits, because the satellite is at the 1/1-resonance (1 nodal revolution per 1 sidereal day).

scholarly journals The LBT satellites of Nearby Galaxies Survey (LBT-SONG): the satellite population of NGC 628

2020 ◽  
Vol 500 (3) ◽  
pp. 3854-3869
Author(s):  
A Bianca Davis ◽  
Anna M Nierenberg ◽  
Annika H G Peter ◽  
Christopher T Garling ◽  
Johnny P Greco ◽  
...  
Keyword(s):  
Milky Way ◽  
Large Magellanic Cloud ◽  
Satellite System ◽  
Mass Star ◽  
Star Forming ◽  
Local Volume ◽  
Satellite Galaxy ◽  
Measurement Methodology ◽  
Close Satellite ◽  
Nearby Galaxies

ABSTRACT We present the first satellite system of the Large Binocular Telescope Satellites Of Nearby Galaxies Survey (LBT-SONG), a survey to characterize the close satellite populations of Large Magellanic Cloud to Milky-Way-mass, star-forming galaxies in the Local Volume. In this paper, we describe our unresolved diffuse satellite finding and completeness measurement methodology and apply this framework to NGC 628, an isolated galaxy with ∼1/4 the stellar mass of the Milky Way. We present two new dwarf satellite galaxy candidates: NGC 628 dwA, and dwB with MV = −12.2 and −7.7, respectively. NGC 628 dwA is a classical dwarf while NGC 628 dwB is a low-luminosity galaxy that appears to have been quenched after reionization. Completeness corrections indicate that the presence of these two satellites is consistent with CDM predictions. The satellite colours indicate that the galaxies are neither actively star forming nor do they have the purely ancient stellar populations characteristic of ultrafaint dwarfs. Instead, and consistent with our previous work on the NGC 4214 system, they show signs of recent quenching, further indicating that environmental quenching can play a role in modifying satellite populations even for hosts smaller than the Milky Way.

scholarly journals A suggested analytical treatment of the orbit of a close satellite.

1957 ◽  
Vol 62 ◽  
pp. 33
Author(s):  
Theodore E. Sterne
Keyword(s):  
Analytical Treatment ◽  
Close Satellite

Perturbations of a close satellite by the equatorial ellipticity of the earth

1957 ◽  
Vol 62 ◽  
pp. 183 ◽  
Author(s):  
John A. O'Keefe ◽  
Charles D. Batchlor
Keyword(s):  
The Earth ◽  
Close Satellite

Prediction of RTK positioning integrity for journey planning

2020 ◽  
Vol 14 (4) ◽  
pp. 431-443
Author(s):  
A. El-Mowafy ◽  
N. Kubo
Keyword(s):  
Prediction Method ◽  
Transport Systems ◽  
Intelligent Transport Systems ◽  
Intelligent Transport ◽  
Position Errors ◽  
Satellite Geometry ◽  
Route Information ◽  
Close Satellite ◽  
Receiver Autonomous Integrity Monitoring ◽  
City Models

AbstractPositioning integrity is crucial for Intelligent Transport Systems (ITS) applications. In this article, a method is presented for prediction of GNSS positioning integrity for ITS journey planning. This information, in addition to other route information, such as distance and time, can be utilized to choose the safest and economical route. We propose to combine the Advanced Receiver Autonomous Integrity Monitoring (ARAIM) technique, tailored for ITS, with 3D city models. Positioning is performed by GNSS Real-Time Kinematic (RTK) method, which can provide the accuracy required for ITS. A new threat model employed for computation of the protection levels (PLs) for RTK positioning is discussed. Demonstration of the proposed approach is performed through a kinematic test in an urban area in Tokyo. The comparison between the prediction method and the actual observations show that the two estimate close satellite geometry and PLs. The method produced PLs that bounds the actual position errors all the time and they were less than the preset alert limit.

The variations in eccentricity and apse precession rate of a narrow ring perturbed by a close satellite

Icarus ◽  
1983 ◽  
Vol 53 (1) ◽  
pp. 84-89 ◽  
Author(s):  
Nicole Borderies ◽  
Peter Goldreich ◽  
Scott Tremaine
Keyword(s):  
Precession Rate ◽  
Close Satellite ◽  
Narrow Ring
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