Semi-Equatorial Orbits Around an Oblate Body

2012 ◽  
Vol 35 (1) ◽  
pp. 316-321 ◽  
Author(s):  
Mayer Humi
Keyword(s):  
Oblate Body

Potential Flow Around a Thin Oblate Body of Revolution

1983 ◽  
Vol 43 (1) ◽  
pp. 212-224 ◽  
Author(s):  
Richard N. Barshinger ◽  
James F. Geer
Keyword(s):  
Potential Flow ◽  
Body Of Revolution ◽  
Oblate Body

E-Type Asteroid (2867) Steins as Imaged by OSIRIS on Board Rosetta

Science ◽  
2010 ◽  
Vol 327 (5962) ◽  
pp. 190-193 ◽  
Author(s):  
H. U. Keller ◽  
C. Barbieri ◽  
D. Koschny ◽  
P. Lamy ◽  
H. Rickman ◽  
...  
Keyword(s):  
Solid Rock ◽  
Direct Evidence ◽  
Imaging System ◽  
Main Belt ◽  
Rosetta Mission ◽  
Oblate Body ◽  
Spherical Diameter ◽  
Yorp Effect ◽  
Comet 67P ◽  
Rubble Pile

The European Space Agency’s Rosetta mission encountered the main-belt asteroid (2867) Steins while on its way to rendezvous with comet 67P/Churyumov-Gerasimenko. Images taken with the OSIRIS (optical, spectroscopic, and infrared remoteimaging system) cameras on board Rosetta show that Steins is an oblate body with an effective spherical diameter of 5.3 kilometers. Its surface does not show color variations. The morphology of Steins is dominated by linear faults and a large 2.1-kilometer-diameter crater near its south pole. Crater counts reveal a distinct lack of small craters. Steins is not solid rock but a rubble pile and has a conical appearance that is probably the result of reshaping due to Yarkovsky-O’Keefe-Radzievskii-Paddack (YORP) spin-up. The OSIRIS images constitute direct evidence for the YORP effect on a main-belt asteroid.

Borehole resistivity curves near spheroidal masses

Geophysics ◽  
1980 ◽  
Vol 45 (10) ◽  
pp. 1513-1522 ◽  
Author(s):  
T. L. Dobecki
Keyword(s):  
Electrical Resistivity ◽  
Coal Gasification ◽  
Random Noise ◽  
Electrical Potential ◽  
The Body ◽  
Process Time ◽  
Prolate Spheroidal ◽  
Cross Sectional ◽  
Oblate Body ◽  
Made In

Modeling of in situ energy extraction processes (e.g., coal gasification and oil shale retorting) has been examined by assuming the affected zones may be described by oblate or prolate spheroids of lowered electrical resistivity. The purpose of the model study is to determine if such subsurface bodies may be monitored and defined by electrical resistivity measurements made in boreholes away from the reaction zone. Solutions of the Laplace equation in (1) oblate and (2) prolate spheroidal coordinate systems enable theoretical determination of the electrical potential distribution as would be measured in a borehole near an anomalous body of oblate or prolate shape. The body is assumed to be enclosed within an infinite, homogeneous mass. Normal (pole‐pole) type curves of (1) electrical resistivity for various electrode spacings (sounding curves) and (2) electrical resistivity for various positions in the borehole (vertical profiling) are developed for both oblate and prolate spheroidal models using spheroids of increasing size as a sensitivity parameter. Modeling results verify that an oblate body of the same cross‐sectional shape as a prolate body produces the larger anomaly. For the various size and resistivity parameters specified in this study, deviations from the homogeneous case (i.e., no spheroid) range from 3 percent for the smallest oblate and prolate bodies up to 60 percent for the largest modeled oblate body. If a ±5 percent uncertainty because of instrumentation, field technique, or random noise may be assumed, this implies a lower limit to the size of a detectable body. On this basis, the smaller spheroids of this study would not be detectable. However, both sounding and profiling type measurements offer promise as effective monitoring tools, and, if repeated over the period of process time, may enable process growth estimates. Further, because the oblate case is independent of azimuth while the prolate is not, measurements made in a series of borings surrounding the process center may describe the shape tendency (oblate versus prolate) of the process and determine directivity (azimuth of prolate major axis) of the process if existent.

Nearly Circular Equatorial Orbits About an Oblate Body with Atmosphere

2009 ◽  
Vol 32 (4) ◽  
pp. 1287-1294 ◽  
Author(s):  
Mayer Humi ◽  
Thomas Carter
Keyword(s):  
Oblate Body
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