System of absolute elevations in the marginal zone of the moon derived from stellar occultations

1979 ◽  
Vol 21 (3) ◽  
pp. 277-281 ◽  
Author(s):  
I. G. Chugunov
Keyword(s):  
Marginal Zone ◽  
The Moon ◽  
Stellar Occultations

scholarly journals The Investigation of Lunar Limb Structure by Means of Stellar Occultations

1971 ◽  
Vol 2 ◽  
pp. 601-606 ◽  
Author(s):  
David S. Evans
Keyword(s):  
Standard Model ◽  
Point Source ◽  
Relative Motion ◽  
Position Angle ◽  
Small Scale ◽  
The Moon ◽  
The Standard Model ◽  
Stellar Occultations ◽  
Limb Structure

It has long been recognized that the analysis of occultation traces from point source stars might provide a means of investigating the structure of the lunar limb on a remarkably small scale, certainly of tens of meters, possibly on a scale of meters.The routine process of analysis of such an occultation trace produces a curve fitted to the standard model for a point source, in which the observed rate of fringe passage is matched to that computed from the rate and position angle of the relative motion of the moon with respect to the star background and the position angle of the point at which the occultation occurs. If θυ is the position angle towards which the relative motion of the lunar center takes place, θ that at which the occultation occurs, and ψ = θν — θ, then the predicted rate of the lunar limb perpendicular to itself at this point isRp = V cos ψwhere V is the velocity of the lunar center.

scholarly journals Photographic Observation of Stellar Occultations

1988 ◽  
Vol 98 ◽  
pp. 144-145
Author(s):  
A. Tomić ◽  
N. Čabrić ◽  
V. Čelebonović
Keyword(s):  
List Type ◽  
Type Number ◽  
The Moon ◽  
Photographic Observation ◽  
High Quality ◽  
Crucial Step ◽  
Stellar Occultations ◽  
On Line

Stellar occultations are usually observed visually, but this can also be done photographically. Our method has some advantages: –the obtained moments of contacts refer to the smoothed lunar limb,–the error in the determination of contacts is calculable,–the error may be less than in visual work,–the reduction of photographs is fast, due to the application of an “on-line” computer [1].In order to achieve all this, it is necessary to make a series of photographs of the Moon and the object being occulted before the first and after the last contact. This is a crucial step in our method, because the photographs must be of high quality. This demands two things: –the images of the occulted object and the Moon must be reliably recorded and–the illuminated limb of the Moon must give optimal darkening on the film.

A Study of the Figure of the Moon from Photographs of the Full Moon

1962 ◽  
Vol 14 ◽  
pp. 63-66
Author(s):  
H. I. Potter
Keyword(s):  
Marginal Zone ◽  
Full Moon ◽  
The Other ◽  
The Moon ◽  
Origin And Evolution ◽  
Other Hand ◽  
Exact Figure

A study of the general figure of the Moon is of great importance for the solution of many problems. First of all, in astrometric observations of the Moon the position of its centre is determined by reference to its limb; and thus in order to compare the observed coordinates of the Moon with ephemerides it is necessary to adopt a definite hypothesis about the form of the limb. On the other hand, when compiling maps of the marginal zone of the Moon it is necessary to refer the heights of individual points to the barycentric sphere, common for all sections of the limb and all phases of libration. And, thirdly, studies of the rotation of the Moon and of its physical librations are also connected with the measurement of points on the limb and require the knowledge of its general form. Finally, a knowledge of the exact figure of the Moon is highly important for the theory of the origin and evolution of our satellite.

The U.S. Naval Observatory Survey of the Marginal Zone of the Moon

1962 ◽  
Vol 14 ◽  
pp. 59-61 ◽  
Author(s):  
C. B. Watts
Keyword(s):  
Marginal Zone ◽  
Position Angle ◽  
The Moon ◽  
Photoelectric Device ◽  
Naval Observatory ◽  
The U.S

In a survey of the marginal zone now approaching completion at the U.S. Naval Observatory about 700 photographs of the Moon, made on 503 nights, have been utilized. These photographs, made at the Naval Observatory, the Yale-Columbia Southern Station at Johannesburg, and the Lowell Observatory, were measured by an automatic photoelectric device. The measures were recorded graphically in the form of profiles, which are on a scale of 41 mm per degree in position angle and 16 mm per second of arc in radius.

A digitised version of C. B. Watts' charts of the marginal zone of the moon

The Moon ◽  
1971 ◽  
Vol 2 (4) ◽  
pp. 463-467 ◽  
Author(s):  
L. V. Morrison ◽  
R. J. Martin
Keyword(s):  
Marginal Zone ◽  
The Moon

scholarly journals Problem of Using Lunar Positional Observations for Determination of Zero-Points of Fundamental Star Catalogues

1990 ◽  
Vol 141 ◽  
pp. 93-93
Author(s):  
V. A. Fomin
Keyword(s):  
Marginal Zone ◽  
Precise Determination ◽  
The Moon ◽  
Star Catalogue ◽  
Secular Variations ◽  
Image Position ◽  
The Right ◽  
Right Ascension ◽  
Zero Points

The long series of meridian observations of the Moon can be used for the precise determination of the equinox- and equator-corrections of a star catalogue. Systematic errors of different charts of the lunar marginal zone used for the reduction of the lunar limb observations have no influence on the determination of the secular variations of the zero-points of the fundamental coordinate system.From meridian observations of the lunar limb made during the interval 1923-1977 in Washington, Greenwich, Cape and Tokyo the following estimate is found for the correction to the right ascension system of the FK4 catalogue: which is in disagreement with the values used for the compilation of the FK5 catalogue.

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