scholarly journals Saturn Satellites and Minor Planets Positions in February 1933 at Esq, La Silla

1982 ◽  
Vol 6 ◽  
pp. 1-11
Author(s):  
H. Debehogne ◽  
R. R. De Freitas Mourão ◽  
L. E. Da Silva Machado
Keyword(s):  
Minor Planets ◽  
Royal Institute ◽  
Star Catalogue ◽  
Measuring Machine ◽  
Saturn Satellites

In february 1983. we have observed the Satellites of Saturn and Minor Planets at the ESO, La Silla, Chile. The instrument GRO (D=40cm; f=4m) was used. Having clear skies, magnitude 18 could be attained. Measures and reductions were performed at the Observatoire royal de Belgique with the Ascorecord measuring machine (0,1µ) and by means of five reference stars on the UNIVAC computer of the Royal Institute of Meteorology (SAO Star Catalogue, Least Squaras and Dependences Methods).

scholarly journals Determinação de posições de asteróides observados no Observatório Europeu Austral em setembro de 1987, La Silla, andes Chilenos, por meio de campo duplo em uma única placa fotográfica

1989 ◽  
Vol 12 ◽  
pp. 11-20
Author(s):  
H. Debehogne ◽  
L.E. Machado ◽  
E.R. Netto
Keyword(s):  
Double Star ◽  
Minor Planets ◽  
Photographic Material ◽  
Star Catalogue ◽  
Measuring Machine ◽  
First Time ◽  
Star Field

In September 1987 we have observed minor planets at La Silla, ESO, with the GPO astrometric refractor (D = 40 cm; F=400 cm). Measures and reductions were performed at the Observatório do Valongo (UFRJ) with the Ascorecord measuring machine (0,1µ) and by means of five reference stars (SAO Star Catalogue - 1950,0). By the first time, double star field were used for saving time and photographic material.

scholarly journals Posições de Asteróides do Programa Internacional do Instituto de Astronomia Teórica de Leningrado obtidas no Rio de Janeiro

1978 ◽  
Vol 2 ◽  
pp. 108-120
Author(s):  
H Debehogne ◽  
Luiz Eduardo S. Machado ◽  
José Felipe C. Caldeira ◽  
Gilson G. Vieira ◽  
Edgar R. Netto
Keyword(s):  
Rio De Janeiro ◽  
Minor Planets ◽  
Clear Sky ◽  
Measuring Machine

In September 1977, we have observed Minor Planets at Rio de Janeiro, most of them indicated as to be observed (signed X, XX or + in Ephemerides Minor Planets from ITA or required by Program of Leningrad) . The instrument Astrographic Camera (f = 170cm, Φ 25cm) was used. By clear sky, magnitude 13.5 to 14 could be attained. Measures and reductions were performed at the Observatório do Valongo with the Ascorecord measuring machine (0,1 µ ) and by means of five reference stars (SAO catalogue) on the Burroughs B6700 NCE-UFRJ computer.

scholarly journals The Bordeaux Automatic Transit Circle: First Catalogues, Current and Future Programs

1986 ◽  
Vol 109 ◽  
pp. 435-442 ◽  
Author(s):  
Y. Requième ◽  
J. M. Mazurier
Keyword(s):  
Minor Planets ◽  
Meridian Circle ◽  
Nearby Stars ◽  
Saturn Satellites ◽  
Input Catalogue

The Bordeaux automatic meridian circle has been used for routine differential observations for three years. Current programs concern NPZT stars, faint nearby stars from the Gliese catalogue, Mars, Uranus, Neptune, Jupiter and Saturn satellites, and minor planets. From 1984 on, 5000 faint stars from the HIPPARCOS Input Catalogue will be observed.

scholarly journals From telescope to MPC: Organizing the minor planets

1996 ◽  
Vol 172 ◽  
pp. 153-164 ◽  
Author(s):  
B.G. Marsden
Keyword(s):  
Rapid Development ◽  
Computer Software ◽  
Minor Planet ◽  
Minor Planets ◽  
Oak Ridge ◽  
Star Catalogue ◽  
Ccd Observations ◽  
Guide Star ◽  
The University

Somewhat more than a century after its introduction for the purpose of discovering minor planets, photography is now rapidly giving way to the CCD as the technology of choice for observing these bodies. A CCD has been used in scanning mode in the University of Arizona's ‘Spacewatch’ program for the discovery of minor planets since as long ago as 1984 (Gehrels 1984, Gehrels et al. 1986), while a CCD in stare mode was first applied as a matter of routine to an established observing program for astrometric follow-up in 1989—that at the Oak Ridge Observatory in Massachusetts (McCrosky 1990). After its initial 1984–1986 success, Spacewatch was modified with the help of a larger CCD and improved computer software and with the adoption of the particular mission of searching for NEOs, or minor planets (and comets) that pass close to the earth (Rabinowitz 1991, Scotti 1994). The Oak Ridge program utilizes a 1.5-m reflector, and the first CCD observations were reduced using the Astrographic Catalogue, the mainstay of the Oak Ridge photographic program back to its inauguration in 1972, as well as of other older photographic programs in which the fields observed were significantly less than 1° across. Within months, the availability, on CD-ROMs, of the STScI Guide Star Catalogue (Villard 1989) effectively consigned the venerable AC to the scrap-heap, and the rapid development of ready-made and relatively inexpensive CCD systems (e.g., di Cicco 1992) has recently increased the volume of CCD astrometry considerably, allowing it to be conveniently and reliably carried out, even by amateur astronomers. At the present time, very nearly 50 percent of the astrometric observations, typically 6000, published each month in the Minor Planet Center's Minor Planet Circulars are obtained by means of a CCD.

On nearly-commensurable periods in the restricted problem of three bodies, with calculations of the long-period variations in the interior 2:1 case

1966 ◽  
Vol 25 ◽  
pp. 197-222 ◽  
Author(s):  
P. J. Message
Keyword(s):  
Periodic Solution ◽  
Periodic Solutions ◽  
Large Amplitude ◽  
Restricted Problem ◽  
Small Amplitude ◽  
Minor Planets ◽  
Long Period ◽  
Numerical Integrations ◽  
Period Variations ◽  
The Mean

An analytical discussion of that case of motion in the restricted problem, in which the mean motions of the infinitesimal, and smaller-massed, bodies about the larger one are nearly in the ratio of two small integers displays the existence of a series of periodic solutions which, for commensurabilities of the typep+ 1:p, includes solutions of Poincaré'sdeuxième sortewhen the commensurability is very close, and of thepremière sortewhen it is less close. A linear treatment of the long-period variations of the elements, valid for motions in which the elements remain close to a particular periodic solution of this type, shows the continuity of near-commensurable motion with other motion, and some of the properties of long-period librations of small amplitude.To extend the investigation to other types of motion near commensurability, numerical integrations of the equations for the long-period variations of the elements were carried out for the 2:1 interior case (of which the planet 108 “Hecuba” is an example) to survey those motions in which the eccentricity takes values less than 0·1. An investigation of the effect of the large amplitude perturbations near commensurability on a distribution of minor planets, which is originally uniform over mean motion, shows a “draining off” effect from the vicinity of exact commensurability of a magnitude large enough to account for the observed gap in the distribution at the 2:1 commensurability.

Brief summary of Kleť photographic search programme for minor planets

1999 ◽  
Vol 173 ◽  
pp. 189-192
Author(s):  
J. Tichá ◽  
M. Tichý ◽  
Z. Moravec
Keyword(s):  
Ccd Camera ◽  
Minor Planet ◽  
Minor Planets ◽  
Main Belt

AbstractA long-term photographic search programme for minor planets was begun at the Kleť Observatory at the end of seventies using a 0.63-m Maksutov telescope, but with insufficient respect for long-arc follow-up astrometry. More than two thousand provisional designations were given to new Kleť discoveries. Since 1993 targeted follow-up astrometry of Kleť candidates has been performed with a 0.57-m reflector equipped with a CCD camera, and reliable orbits for many previous Kleť discoveries have been determined. The photographic programme results in more than 350 numbered minor planets credited to Kleť, one of the world's most prolific discovery sites. Nearly 50 per cent of them were numbered as a consequence of CCD follow-up observations since 1994.This brief summary describes the results of this Kleť photographic minor planet survey between 1977 and 1996. The majority of the Kleť photographic discoveries are main belt asteroids, but two Amor type asteroids and one Trojan have been found.

The O–C diagrams of minor planets − a new approach to modelling the rotation

1999 ◽  
Vol 173 ◽  
pp. 185-188
Author(s):  
Gy. Szabó ◽  
K. Sárneczky ◽  
L.L. Kiss
Keyword(s):  
Error Analysis ◽  
Time Dependence ◽  
Theoretical Work ◽  
Minor Planet ◽  
Minor Planets ◽  
New Approach ◽  
Preliminary Results ◽  
Ccd Observations

AbstractA widely used tool in studying quasi-monoperiodic processes is the O–C diagram. This paper deals with the application of this diagram in minor planet studies. The main difference between our approach and the classical O–C diagram is that we transform the epoch (=time) dependence into the geocentric longitude domain. We outline a rotation modelling using this modified O–C and illustrate the abilities with detailed error analysis. The primary assumption, that the monotonity and the shape of this diagram is (almost) independent of the geometry of the asteroids is discussed and tested. The monotonity enables an unambiguous distinction between the prograde and retrograde rotation, thus the four-fold (or in some cases the two-fold) ambiguities can be avoided. This turned out to be the main advantage of the O–C examination. As an extension to the theoretical work, we present some preliminary results on 1727 Mette based on new CCD observations.

Measurements of the Cape Astrometric Survey of the Southern Hemisphere

1978 ◽  
Vol 48 ◽  
pp. 515-521
Author(s):  
W. Nicholson
Keyword(s):  
Southern Hemisphere ◽  
Automatic Measuring ◽  
Measuring Machine ◽  
Final Selection ◽  
Selection Of

SummaryA routine has been developed for the processing of the 5820 plates of the survey. The plates are measured on the automatic measuring machine, GALAXY, and the measures are subsequently processed by computer, to edit and then refer them to the SAO catalogue. A start has been made on measuring the plates, but the final selection of stars to be made is still a matter for discussion.

Sign in / Sign up

Export Citation Format

Share Document