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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 mass and 4.9 times its luminosity.
HR 8799 e is a large exoplanet, orbiting the star HR 8799, which lies 129 light-years from Earth.This gas giant is between 5 and 10 times the mass of Jupiter. [1] Due to their young age and high temperature all four discovered planets in the HR 8799 system are large, compared to all gas giants in the Solar System.
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 and 10 Jupiter masses and a radius from 20 to 30% larger than Jupiter's.
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An HR Diagram of PMS stars with different masses. The Hayashi Track is depicted as vertical lines, while the Henyey are horizontal. Higher mass stars spend very little time on the Hayashi Track, while the lowest mass stars never reach the Heyney Track, with a gradient seen of time spent on each track as the mass increases.
Massachusetts Maritime Academy (Mass Maritime, MMA) is a public university in Buzzards Bay, Massachusetts, focused on maritime-related fields.It was established in 1891 and is the second oldest state maritime academy in the United States.
An observational Hertzsprung–Russell diagram with 22,000 stars plotted from the Hipparcos Catalogue and 1,000 from the Gliese Catalogue of nearby stars. Stars tend to fall only into certain regions of the diagram.
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