HR 8799 is a star that is visible to the naked eye. It has a magnitude 5.96 and it is located inside the western edge of the great square of Pegasus almost exactly halfway between Beta and Alpha Pegasi. The star's name of HR 8799 is its line number in the Bright Star Catalogue.

Mar 28, 2025 · HR 8799 e is a gas giant exoplanet that orbits a F-type star. Its mass is 10 Jupiters, it takes 57 years to complete one orbit of its star, and is 16.4 AU from its star. Its discovery was announced in 2010.

Mar 17, 2025 · NASA’s James Webb Space Telescope has provided the clearest look in the infrared yet at the iconic multi-planet system HR 8799. The closest planet to the star, HR 8799 e, orbits 1.5 billion miles from its star, which in our solar system would be located between the orbit of Saturn and Neptune.

HR 8799 e is the fourth planet orbiting HR 8799 in order of discovery. It is a young, hot and massive gas giant, and is fairly close to its star, lying just between the orbits of Saturn and Uranus in the Solar System. The planet is still glowing red-hot. [1]

Mar 17, 2025 · HR 8799 is a young system about 30 million years old, a fraction of our solar system’s 4.6 billion years. Still hot from their tumultuous formation, the planets within HR 8799 emit large amounts of infrared light that give scientists valuable data on how they formed.

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 come are appealingly apparent.

Mar 25, 2025 · HR 8799 is still young compared to our own solar system, only about 30 million years old. Our solar system, on the other hand, is 4.6 billion years old. This means the planets are still forming ...

Mar 25, 2025 · HR 8799, star that has the first extrasolar planetary system to be seen directly in an astronomical image. HR 8799 is a young (about 60 million years old) main-sequence star of spectral type A5 V located 128 light-years from Earth in the constellation Pegasus.

Mar 17, 2025 · The NASA/ESA/CSA James Webb Space Telescope has provided the clearest look yet at the iconic multi-planet system HR 8799. The observations detected carbon dioxide in each of the planets, which provides strong evidence that the system’s four giant planets formed much like Jupiter and Saturn, by slowly building solid cores that attract gas from ...

Oct 6, 2011 · This is an illustration of the HR 8799 exoplanet system based on the reanalysis of Hubble NICMOS data and ground-based observations. The positions of the star and the orbits of the four known planets are shown schematically.