Paris Observatory Analysis Center (OPAR): Report on Activities, January - December 2012

We report on activities of the Paris Observatory VLBI Analysis Center (OPAR) for calendar year 2012 concerning the development of operational tasks, the development of our Web site, and various other activities: monitoring of the Earth's free core nutation, measuring of the post-seismic displacements of some stations, and the analysis of the recent IVS R&D sessions, including observations of quasars close to the Sun

Paris Observatory (OPAR) Data Center

This report summarizes the OPAR Data Center activities in 2012. Included is information about functions, architecture, status, future plans, and staff members of OPAR Data Center

GBOT - one year before Gaia's launch

International audienceGBOT (Ground Based Optical Tracking, [1]) is a part of the Gaia satellie mission, which is being set up to be able to fully exploit the capabilities of the satellite, even for the best measured stars. The GBOT project consists of about half a dozen small (1-2 m class telescopes), which will make daily observations of the Gaia space craft. From these data, the GBOT group will derive astrometric positions, which will be used in the reconstruction of Gaia's orbit

VLBI at OPAR: Analysis Service and Research

International audienc

OPERATIONAL AND RESEARCH ACTIVITY AT OPAR

International audienceThe IVS analysis center of the Paris Observatory (OPAR) was born in 1999 when the IVS was created. In the early years, the operational activity was mainly focused on the production ofUT1 from intensive sessions. The activity was renewed in 2007 with the submission of a new long term solution to the IVS. OPAR now proposes a larger number of VLBI products

VLBI at OPAR: Analysis Service and Research

International audienc

OPERATIONAL AND RESEARCH ACTIVITY AT OPAR

International audienceThe IVS analysis center of the Paris Observatory (OPAR) was born in 1999 when the IVS was created. In the early years, the operational activity was mainly focused on the production ofUT1 from intensive sessions. The activity was renewed in 2007 with the submission of a new long term solution to the IVS. OPAR now proposes a larger number of VLBI products

Web interface for lunar laser ranging observations

International audienceWe report the current development of a web interface for the preparation and the validation of Lunar Laser Ranging (LLR) observations. With this service which is not yet completely implemented at the time of this presentation, distant LLR observers will be able to easily run some Paris observatory tools used for the lunar motion. It will allow them to compute predictions of geocentric and topocentric coordinates of lunar targets (as retro-reflectors and craters) and predictions of round-trip times of laser-pulses between terrestrial stations and lunar retro-reflectors. It will also allow them to compare their own LLR observations with computations (lunar solutions and reduction models), in terms of rms, and with a real-time access

Web interface for lunar laser ranging observations

International audienceWe report the current development of a web interface for the preparation and the validation of Lunar Laser Ranging (LLR) observations. With this service which is not yet completely implemented at the time of this presentation, distant LLR observers will be able to easily run some Paris observatory tools used for the lunar motion. It will allow them to compute predictions of geocentric and topocentric coordinates of lunar targets (as retro-reflectors and craters) and predictions of round-trip times of laser-pulses between terrestrial stations and lunar retro-reflectors. It will also allow them to compare their own LLR observations with computations (lunar solutions and reduction models), in terms of rms, and with a real-time access

Tectonic motion vizualisation through a Virtual Observatory, from space geodesy techniques.

International audienceThis paper presents the astronomical so-called Virtual Observatory (VO), and gives some examples of Webservices hosted by GRGS Analysis Center webpages, that can be used for Earth sciences applications, and for stations operations. GRGS, Groupe de Recherche de Géodésie Spatiale, France, routinely delivers geodetic products to most of the space geodetic services of the International Association of Geodesy. Some of these products are now natively archived following the data format recommended by IVOA, the VO-Table format, an improved version of the XML format. In this paper, we pay a particular attention on the capabilities suitable to extract and use time series of (i) Space Station Coordinates deduced from SLR, DORIS and GPS data, (ii) EOP deduced from SLR and VLBI data. We show how to use all these on-line tools through the web to: select charts to plot, display and edit the data (scale, appearance) ; download data, plots and graph statistics in several formats. The examples will be based on some stations of interest with coordinates (latitudes, longitudes, altitudes) affected by several features such as earthquakes or technological evolutions