It seems a fragment of the original star catalogue of #Hipparcos may have been discovered. Would be a great discovery, marking a milestone of the beginning of quantitative #Astronomy . Another #Palimpsest for the win!

https://greekreporter.com/2023/08/20/ancient-greek-map-sky-discover-monastery/

Two images of a #Jupiter-like #planet that orbits the star AF Leporis imaged with the #SPHERE instrument on #VLT in Chile.

Over the years, astronomers observed accelerating motion in the #star's movement in #Hipparcos and #Gaia observations

#Planets exert a gravitational tug on their host stars, explaining the acceleration, and as astronomers took a closer look at this star with the VLT, they managed to directly image the planet orbiting it.

#astronomy #exoplanets
https://www.eso.org/public/images/potw2308a/

Constraints for the orbital #inclination and the true mass of long-period single companions.

This work illustrates how #Gaia and #Hipparcos allow for the orbital properties and masses of long-period RV companions to be further constrained.

The first constraints for nearby long-period #planets from Gaia have started getting published.

#astronomy #exoplanets #radialvelocity #astrometry
https://arxiv.org/abs/2301.01263

@cmdrDiscoCat They had everything up to #Hipparcos data to work with at that time. And now #GaiaMission is in the process of expanding further upon what we know of our Galaxy. The illustration I screencapped comes from a website created by @galaxy_map and he might be better able to address the coordinates aspect of things.