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Inversion of sparse photometric data of asteroids using triaxial ellipsoid shape models and a Lommel-Seeliger scattering law
Cellino, A.; Hestroffer, D.; Muinonen, K. +1 more
The inversion of sparse photometric data of asteroids to derive from them information about the spin and shape properties of the objects is a hot topic in the era of the Gaia space mission. We have used a rigorous analytical treatment of the Lommel-Seeliger light-scattering law computed for the particular case of bodies having the shapes of ideal …
Ground-based astrometric observations of latitude for improved reference frame
Damljanović, Goran
The Commission 19 (Earth Rotation) of the International Astronomical Union - IAU established the Working Group on Earth Rotation in the Hipparcos Reference Frame - WG ERHRF at 1995 to collect the optical observations of latitude and universal time variations, made during 1899.7-1992.0 in line with Earth orientation programmes (to derive Earth Orie…
Rotational periods of asteroids II
Riccioli, D.; Blanco, C.; Cigna, M.
In the framework of the photoelectric asteroid observational program undertaken at Catania University to collect lightcurves apt to apply the pole computational methods, the V-band lightcurves and the values of the synodic rotational period and of the average B- V colour index of 5 Astrea, 6 Hebe, 12 Victoria, 13 Egeria, 26 Proserpina, 34 Circe, 6…
Prospects in astrometry and orbital determination of minor bodies
Carpino, M.
The astrometry of asteroids and comets is undergoing a significant progress, both in accuracy and number of observations, as a consequence of the introduction of CCD devices and the availability of stellar catalogues dense enough to cope with CCD relatively small fields of view. Further, substantial progress in accuracy is expected from the availa…
Observations of minor planets by Hipparcos
Hestroffer, D.; Morando, B.
The main goal of Hipparcos is to build a catalogue of stars but 48 minor planets are bright enough and sufficiently pointlike to be observed also. This paper describes some aspects of the minor planets astrometric data reduction procedure. Comparison to the calculated places is given as well as a first attempt to minor planets orbital elements cor…