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Blocking Starlight Much Closer to Home 2: This Year`s
Blocking Starlight Much Closer to Home 2: This Year`s

... magnitude star than to find a ring around Pluto or to discover a moon. Anyway, we have the light curve of an occultation by that 15th magnitude star, which was the typical brightness of our occultation stars that we were observing anyway. We are about to submit a paper to the Astronomical Journal a ...
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Ch 12 slides - UNLV Physics

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Name: ____ Date: __________ Period: ________ Pluto Files (PBS
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... years ago at most, and possibly much more recently than that, researchers said. But other parts of Pluto harbor lots of visible craters, and some regions have a middling (small) number, suggesting that the dwarf planet has been geologically active on a large scale over its entire history. This findi ...
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Chapter 12 (in pdf)

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Genre • Expository Text Essential Question
Genre • Expository Text Essential Question

... a disk. Astronomers believe it contains approximately 70,000 icy objects, including Pluto. This area of space was named the Kuiper Belt, after the Dutch-American astronomer Gerard Kuiper (KI-per) who lived from 1905 to 1973. In 1951, more than forty years before its discovery, Kuiper actually predic ...
The Everest of Planetary Exploration: New Horizons Explores The
The Everest of Planetary Exploration: New Horizons Explores The

... Goal: Understand how dwarf planets evolve; compare and contrast with icy satellites ...
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Eris (dwarf planet)



Eris (minor-planet designation 136199 Eris) is the most-massive and second-largest dwarf planet known in the Solar System. It is also the ninth-most-massive known body directly orbiting the Sun, and the largest known body in the Solar System not visited by a spacecraft. It was measured to be 2,326 ± 12 kilometers (1,445.3 ± 7.5 mi) in diameter. Eris is 27% more massive than dwarf planet Pluto, though Pluto is slightly larger by volume. Eris's mass is about 0.27% of the Earth's mass.Eris was discovered in January 2005 by a Palomar Observatory–based team led by Mike Brown, and its identity was verified later that year. It is a trans-Neptunian object (TNO) and a member of a high-eccentricity population known as the scattered disk. It has one known moon, Dysnomia. As of 2014, its distance from the Sun is 96.4 astronomical units (1.442×1010 km; 8.96×109 mi), roughly three times that of Pluto. With the exception of some comets, Eris and Dysnomia are currently the most distant known natural objects in the Solar System.Because Eris appeared to be larger than Pluto, NASA initially described it as the Solar System's tenth planet. This, along with the prospect of other objects of similar size being discovered in the future, motivated the International Astronomical Union (IAU) to define the term planet for the first time. Under the IAU definition approved on August 24, 2006, Eris is a ""dwarf planet"", along with objects such as Pluto, Ceres, Haumea and Makemake, thereby reducing the number of known planets in the Solar System to eight, the same as before Pluto's discovery in 1930. Observations of a stellar occultation by Eris in 2010 showed that its diameter was 2,326 ± 12 kilometers (1,445.3 ± 7.5 mi), not significantly different from that of Pluto. After New Horizons measured Pluto's diameter as 7006237200000000000♠2372±4 km in July 2015, it was determined that Eris is slightly smaller in diameter than Pluto.
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