HR 8799 d is an extrasolar planet located approximately 129 light-years away in the constellation of Pegasus, orbiting the 6th magnitude Lambda Boötis star HR 8799. It has a mass between 5 …

Oct 24, 2024 · HR 8799 d is a gas giant exoplanet that orbits a F-type star. Its mass is 10 Jupiters, it takes 101.4 years to complete one orbit of its star, and is 24 AU from its star. Its …

HR 8799 is a roughly 30 million-year-old main-sequence star located 133.3 light-years (40.9 parsecs) away from Earth in the constellation of Pegasus. It has roughly 1.5 times the Sun 's …

Mar 17, 2025 · HR 8799, a young system 130 light-years away, has long been a key target for planet formation studies. The observations indicate that the well-studied planets of HR 8799 …

Jan 25, 2017 · Four planets more massive than Jupiter orbiting the young star HR 8799. The era of directly imaging exoplanets has only just begun, but the science and viewing pleasures to …

Direct Imaging of Multiple Planets Orbiting the Star HR 8799 Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Northern …

James Webb Space Telescope's direct image and study of star HR 8799 and the four exoplanets in orbit around it.

Mar 17, 2025 · High-contrast observations with JWST can reveal key composition and vertical mixing dependent absorption features in the spectra of directly imaged planets across the 3–5 …

Mar 26, 2025 · The HR 8799 system, featuring four gas giants orbiting between 1.5 and 6.3 billion miles from their star, and 51 Eri b, a cool exoplanet 890 million miles from its star, exemplify …

This image shows three planets orbiting the star HR 8799. It was obtained with the Keck II telescope on Hawaii. Credit: C. Marois et al., NRC Canada. Architecture of the system This list …