Project Struve

We present the current status of the space astrometry and photometry project STRUVE which is being designed at the Pulkovo Observatory (Russia) in cooperation with other Russian space institutes in order to extend the Hipparcos reference system. This project will include about 20 million stars down to V = 19:5 mag. The proper motions of the Hipparcos stars are to be determined with the mean accuracy of about 0.1 mas/yr. The mean accuracy of star positions in the output catalogue is expected to be better than 0.6 mas. A properly designed micrometer will give the possibility of observing all objects on the sky down to V = 14 mag. Key words: space astrometry; future projects. 1. INTRODUCTION The space astrometry and photometry project Struve (Yershov et al. 1995) is being designed at the Pulkovo Observatory in cooperation with other Russian space institutes. It is expected that launch will be before 2010 and a mission duration of at least 36 months is planned. The main objective is to ex..

The PHEMU15 catalogue and astrometric results of the Jupiter's Galilean satellite mutual occultation and eclipse observations made in 2014-2015

During the 2014-2015 mutual events season, the Institut de Mécanique Céleste et de Calcul des Éphémérides (IMCCE), Paris, France, and the Sternberg Astronomical Institute (SAI), Moscow, Russia, led an international observation campaign to record ground-based photometric observations of Galilean moon mutual occultations and eclipses.We focused on processing the complete photometric observations data base to compute new accurate astrometric positions. We used our method to derive astrometric positions from the light curves of the events. We developed an accurate photometric model of mutual occultations and eclipses, while correcting for the satellite albedos, Hapke's light scattering law, the phase effect, and the limb darkening. We processed 609 light curves, and we compared the observed positions of the satellites with the theoretical positions from IMCCE NOE-5-2010-GAL satellite ephemerides and INPOP13c planetary ephemeris. The standard deviation after fitting the light curve in equatorial positions is ±24 mas, or 75 km at Jupiter. The rms (O-C) in equatorial positions is ±50 mas, or 150 km at Jupiter. © 2017 The Author(s)