Beta Pictoris d: The Faintest Exoplanet Ever Directly Imaged from Earth

In a separate, simultaneous study, JWST's NIRSpec IFU and MIRI/MRS spectroscopy also independently detected Beta Pictoris d, first through the unique chemical signature of its atmosphere . Two independent teams (Suttlief et al. 2026 and Gibbs et al. 2026) announced the discovery within days of each other .

Key Characteristics of Beta Pictoris d

All figures are confirmed by the official NASA Exoplanet Catalog entry and the discovery papers :

• Type: Gas giant orbiting an A-type star .
• Mass: 2.4 Jupiter masses .
• Radius: Approximately 1.26 Jupiter radii, with an effective temperature of around 600 K (327 °C) .
• Orbital radius: 26 AU from its host star .
• Orbital period: 91 years .
• Eccentricity: Less than 0.44 .
• Distance from Earth: The Beta Pictoris system is about 64 light-years away .
• Color: Appears reddish and cold, consistent with a low-mass gas giant .

The Faintest Exoplanet Ever Directly Imaged from Earth

Beta Pictoris d is the faintest exoplanet ever directly imaged from Earth—roughly 100 times dimmer than Beta Pictoris b (the first planet discovered in the system) . It has a measured contrast of ΔL' = 12.11 magnitudes relative to its star , and it is described as "among the lightest exoplanets ever to be photographed from the ground" . This makes it an extraordinary technical achievement: of the more than 6,000 confirmed exoplanets, fewer than 100 have been identified through direct imaging .

What This Discovery Means

Proof of Ground-Based Capability

Detecting a planet this faint from the ground—even without a coronagraph in the initial ERIS observations—demonstrates that next-generation ground-based instruments and future observatories like the Extremely Large Telescope (ELT) will be capable of directly imaging even fainter, lower-mass exoplanets that are more analogous to solar-system-scale ice giants .

A Rare Multi-Planet System in Direct Imaging

The Beta Pictoris system now joins HR 8799 as only the second directly imaged system known to host more than two confirmed planets (b, c, and d) . This allows astronomers to study the system's orbital architecture, dynamical stability, and formation history in much greater detail than a single-planet system would permit .

A Decade-Long Game of Hide-and-Seek

The planet had been lurking in archival images for years without being recognized. Its discovery shows that systematic re-analysis of archival data from JWST, VLT/SPHERE, and other instruments can uncover planets missed by earlier processing techniques .

Future Atmospheric Characterization

JWST's spectroscopic detection (NIRSpec/MIRI) opens the door to characterizing Beta Pictoris d's atmosphere—measuring its temperature, composition, and cloud properties—which will help constrain how gas giants form in debris-rich young systems like Beta Pictoris . Spectra already show clear absorption features of methane (CH₄), carbon monoxide (CO), and water (H₂O) .