HD 206893 B I Archives

Artist's impression of the HD 206893 system: a substellar companion orbits the star, and could itself host a massive exomoon. Credit: DR

Exoplanets, -moons, -comets, Imaging & Spectroscopy, Press Release, Stellar Cartography

A New Signal Around HD 206893 B: An Exomoon Candidate Revealed By Ultra-high-precision Astrometry

by Keith CowingJanuary 30, 2026January 30, 2026

A study led by a researcher from the Paris Observatory-PSL within the Laboratory for Instrumentation and Research in Astrophysics (LIRA – CNRS / Sorbonne University / Université Paris Cité) reveals […]

Analytical predictions for the astrometric effect of a moon with varying mass and distance to HD 206893 B. GRAVITY could in principle detect moons lower than a Neptune mass at larger periods. The fit of the GRAVITY data is shown as a green point assuming the mass and period as upper limits in our tentative detection. The orange area shows the plausible parameter space where a moon could be located, and still be potentially detectable with GRAVITY assuming an astrometric accuracy of 10 µas (see section 3.3). -- astro-ph.EP

Astronomy & Telescopes, Exoplanets, -moons, -comets, Imaging & Spectroscopy, Status Report

Exomoon Search With VLTI/GRAVITY Around The Substellar Companion HD 206893 B

by Keith CowingNovember 26, 2025June 10, 2026

Direct astrometric detection of exomoons remains unexplored. This study presents the first application of high-precision astrometry to search for exomoons around substellar companions.