![Distributions of planetary mass, mass of the host star and semi-major axis of all confirmed exoplanets listed at exoplanet.eu. The planets are color-coded according to method used for their discovery. The dashed gray line marks the deuterium-burning mass limit of 13 MJup. [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/09/Characterization-1.png?resize=1200%2C710&ssl=1)
[astro-ph.EP] Astrometry is the oldest method used to search for extrasolar planets. This technique provides key information about a planetary system, like the true mass of planets and its three-dimensional […]
Astrometry
![Post-processed NIRCam images for the two epochs, with 1- and 2-σ contours of the expected position, computed with the posteriors of the Octofitter results: in white without including the images in the fit, and in green including the images, but without making a connection between flux and atmospheric model. The postprocessing method is described in Sec. 2.3. When including the images, some walkers tend towards the feature whose location coincides with the expected position of planet b. -- [astro-ph.EP]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/09/An-Updated.png?resize=1200%2C719&ssl=1)
Posted inEpsilon Eridani
An Updated Model For Epsilon Eridani b and Prospects for Imaging With The Roman Coronagraph
[astro-ph.EP] Epsilon Eridani b, the nearest known Jupiter analog, has its orbit and mass constrained from radial velocity (RV) and absolute astrometry, and its atmosphere from JWST/NIRCam imaging upper limits […]
![Illustration of the astro-calibration method. The four reference frames are represented. The three models (s, a, and c) that link them and constitute the parameter vector x are also represented. -- [astro-ph.IM]](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/09/Calibrations.png?resize=1200%2C714&ssl=1)
Posted inAstronomy & Telescopes
Calibrations For High Precision Differential Astrometry Onboard Theia And HWO
[astro-ph.IM] Future space astrometry missions such as Theia and an astrometric mode of the Habitable Worlds Observatory (HWO) require detector calibration and instrumental characterization at an unprecedented level to achieve […]
![Chemical abundance distributions of the Sample II planet-candidate host stars in the [Fe/H]–[Mg/Fe] plane.](https://i0.wp.com/astrobiology.com/wp-content/uploads/2026/08/A-chemo.png?resize=1200%2C715&ssl=1)
Posted inStellar Cartography
A Chemo-dynamical Search For Planet-candidate Hosts Of Possible Extragalactic Origin
[astro-ph.SR] To date, all known exoplanetary systems have been identified around stars currently residing in the Milky Way, whereas planets formed in external galaxies remain largely unexplored. Such systems would […]
European Astronomical Society Annual Meeting 2027
The annual meeting of the EAS, formerly EWASS conference, has been organised since 2014 by the EAS in collaboration with a local Hosting Committee and with the support of a […]
American Astronomical Society AAS 249th Meeting
The 249th AAS meeting (joint with the Historical Astronomy Division) will be held 10–14 January 2027 in Salt Lake City at the Salt Palace Convention Center.
From Gaia to GaiaNIR: Science from Precision Astrometry Across the Universe and Beyond the Extinction Barrier
This conference celebrates the achievements of the MWGaiaDN Doctoral Network, which features PhD projects focused on the science that can be extracted from Gaia DR3 and Gaia DR4. Topics covered […]
Posted inStellar Cartography
TESS Photometry and Radial Velocity Analysis of the sub-Neptune Exoplanet π Mensae c and the Wider π Mensae Planetary System
[astro-ph.EP] Exoplanet characterization relies on precise measurements of planetary orbital and physical parameters. This is particularly important for planetary dynamics and atmospheric evolution, as orbital parameters help constrain system evolution, […]
Posted inComets and Asteroids
NASA Study Finds Near-Earth Asteroid Is Actually Comet
[NASA] The object looks like an asteroid but moves like a comet, so astronomers used some of the most powerful observatories on the planet to confirm its identity.
Posted inAstronomy & Telescopes, Exoplanets, -moons, -comets, Status Report, Stellar Cartography
Gaia Exoplanet Orbits, Demographics, and Evolution Survey (GEODES): Characteristics of Three Long-Period Companions Accelerating their Host Stars
The upcoming release of Gaia DR4 will yield thousands of giant planet candidates, eventually enabling studies of giant planet eccentricities, masses, and occurrence rates across a broad range of stellar […]