High spectral resolution observations of Venus were obtained with the TEXES instrument at NASA's Infrared Telescope Facility. These focus on a CO$_2$ absorption feature 791.4 cm$^{-1}$ as shape this can be used to retrieve vertical temperature profile in Venus' mesosphere. By scan-mapping planet, we are able build up three-dimensional maps atmosphere, covering one Earth-facing hemisphere and an...

Abstract Coincident Geostationary Lightning Mapper (GLM) and National Detection Network (NLDN) observations are used to build a generator of realistic lightning optical signal in the perspective simulate Imager (LI) from European NLDN-like observations. Characteristics GLM NLDN flashes train different machine-learning (ML) models, which predict simulated pseudo-GLM flash extent, duration, event...

Preliminary positions and magnitudes derived from the analysis of 12 weeks of observations from the Hipparcos star mappers are systematically compared with the various sources of ground-based data used in the Hipparcos Input Catalogue. These comparisons allow to cross-check the accuracies claimed by the various sources of ground-based data and by the analysis method of star mapper data. The par...