Showing papers in "The Astronomical Journal in 1970"
281 citations
142 citations
129 citations
125 citations
TL;DR: Periodic orbits in highly perturbed dynamical systems, studying characteristic curves of various families in galactic-type potential have been studied in this paper, where they have been shown to have a similar behavior to the ones in this paper.
Abstract: Periodic orbits in highly perturbed dynamical systems, studying characteristic curves of various families in galactic-type potential
100 citations
TL;DR: Venus obliquity dynamic implications, developing equations for independent parameter set to define spin vector as mentioned in this paper, developed equations for spin vector for independent parameters set to determine spin vector.
Abstract: Venus obliquity dynamic implications, developing equations for independent parameter set to define spin vector
74 citations
TL;DR: In this paper, it was shown that large meteoroids, and in particular chondritic meteorites, apparently come from typically cometary orbits with perihelia close to the orbit of the earth and aphelia near that of Jupiter, but this could be explained by the action of nongravitational forces when they were comets.
Abstract: Although the majority of the minor planets evidently arose as the result of fragmentation of larger planetary objects through collisions, there is a certain amount of evidence that some of them may be defunct cometary nuclei. Opik (e.g. 1963) has long felt that the Apollo asteroids, with their perihelia inside the orbit of the earth, are especially likely to be ex-comets. Their aphelia are well inside the orbit of Jupiter (unlike those of the short-period comets), but this could be explained by the action of nongravitational forces when they were comets, just as the secular acceleration of P/Encke has apparently caused that comet’s aphelion distance to decrease to the present 4.1 AU. The radii of these objects, 1 to 5 km or so, are quite comparable with those of cometary nuclei (Roemer, 1966); further, Wetherill (1968, 1969) has shown that large meteoroids, and in particular chondritic meteorites, apparently come from typically cometary orbits with perihelia near the orbit of the earth and aphelia near that of Jupiter.
67 citations
66 citations
TL;DR: Oblate planet artificial satellite motion, obtaining secular and periodic perturbations to third and second order as discussed by the authors, was used to obtain satellite motion and perturbation to second and third order.
Abstract: Oblate planet artificial satellite motion, obtaining secular and periodic perturbations to third and second order
63 citations
56 citations
TL;DR: Icarus asteroid positions, UBV magnitude, brightness, colors, light curves and polarization, noting stony-iron composition, were reported in this paper, where the authors also noted stony iron composition.
Abstract: Icarus asteroid positions, UBV magnitude, brightness, colors, light curves and polarization, noting stony-iron composition
TL;DR: Mariner 6 and 7 IR spectra were used by NASA to study the topography of Mars as discussed by the authors, discussing geographical resolution, surface carbon dioxide pressure, depressions, ridges and valleys.
Abstract: Mars topography from Mariner 6 and 7 IR spectra, discussing geographical resolution, surface carbon dioxide pressure, depressions, ridges and valleys
TL;DR: In this article, the authors used Mertz type Michelson interferometer as Fourier transform spectrometer for IR spectra for types A0 to M7, using MERTZ type MIMO interferometers.
Abstract: Stellar IR spectra for types A0 to M7, using Mertz type Michelson interferometer as Fourier transform spectrometer