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Moon discovered over dwarf planet Makemake in the Kuiper Belt

Faint moon was previously obscured by the glare of the icy dwarf planet

Date:
June 27, 2016
Source:
Southwest Research Institute
Summary:
Scientists have discovered an elusive, dark moon orbiting Makemake, one of the 'big four' dwarf planets populating the Kuiper Belt region at the edge of our solar system.
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A team led by SwRI's Dr. Alex Parker discovered a small moon around the Kuiper Belt dwarf planet Makemake. Parker's illustration shows Makemake's bright red surface and the inferred darker surface of the moon, known as MK2.
Credit: Image Courtesy of NASA/SwRI/Alex Parker

A Southwest Research Institute-led team has discovered an elusive, dark moon orbiting Makemake, one of the "big four" dwarf planets populating the Kuiper Belt region at the edge of our solar system. The findings are detailed in the paper "Discovery of a Makemakean Moon," published in the June 27 issue of Astrophysical Journal Letters.

"Makemake's moon proves that there are still wild things waiting to be discovered, even in places people have already looked," said Dr. Alex Parker, lead author of the paper and the SwRI astronomer credited with discovering the satellite. Parker spotted a faint point of light close to the dwarf planet using data from Hubble's Wide Field Camera 3. "Makemake's moon -- nicknamed MK2 -- is very dark, 1,300 times fainter than the dwarf planet."

A nearly edge-on orbital configuration helped it evade detection, placing it deep within the glare of the icy dwarf during a substantial fraction of its orbit. Makemake is one of the largest and brightest known Kuiper Belt Objects (KBOs), second only to Pluto. The moon is likely less than 100 miles wide while its parent dwarf planet is about 870 miles across. Discovered in 2005, Makemake is shaped like football and sheathed in frozen methane.

"With a moon, we can calculate Makemake's mass and density," Parker said. "We can contrast the orbits and properties of the parent dwarf and its moon, to understand the origin and history of the system. We can compare Makemake and its moon to other systems, and broaden our understanding of the processes that shaped the evolution of our solar system."

With the discovery of MK2, all four of the currently designated dwarf planets are known to host one or more satellites. The fact that Makemake's satellite went unseen despite previous searches suggests that other large KBOs may host hidden moons.

Prior to this discovery, the lack of a satellite for Makemake suggested that it had escaped a past giant impact. Now, scientists will be looking at its density to determine if it was formed by a giant collision or if it was grabbed by the parent dwarf's gravity. The apparent ubiquity of moons orbiting KBO dwarf planets supports the idea that giant collisions are a near-universal fixture in the histories of these distant worlds.


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Materials provided by Southwest Research Institute. Note: Content may be edited for style and length.


Journal References:

  1. Alex H. Parker, Marc W. Buie, Will M. Grundy, Keith S. Noll. Discovery of a Makemakean Moon. Astrophysical Journal Letters, 2016 [link]
  2. Alex H. Parker, Marc W. Buie, Will M. Grundy, Keith S. Noll. Discovery of a Makemakean Moon. Astrophysical Journal Letters, 2016 [link]

Cite This Page:

Southwest Research Institute. "Moon discovered over dwarf planet Makemake in the Kuiper Belt: Faint moon was previously obscured by the glare of the icy dwarf planet." ScienceDaily. ScienceDaily, 27 June 2016. <www.sciencedaily.com/releases/2016/06/160627214421.htm>.
Southwest Research Institute. (2016, June 27). Moon discovered over dwarf planet Makemake in the Kuiper Belt: Faint moon was previously obscured by the glare of the icy dwarf planet. ScienceDaily. Retrieved May 26, 2017 from www.sciencedaily.com/releases/2016/06/160627214421.htm
Southwest Research Institute. "Moon discovered over dwarf planet Makemake in the Kuiper Belt: Faint moon was previously obscured by the glare of the icy dwarf planet." ScienceDaily. www.sciencedaily.com/releases/2016/06/160627214421.htm (accessed May 26, 2017).

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