Planets and Moons  ID: 4193

Supermoon 2014

On August 10, 2014, the Moon will be full at the same time that it is closest to Earth for the year. This coincidence is sometimes called a supermoon.

The Moon's orbit is very slightly elliptical and therefore somewhat off-center relative to the Earth. Each month, the Moon passes through points in its orbit called perigee and apogee, the closest and farthest points from the Earth for that month. Some perigees are a little closer than others. The closest perigee for 2014 occurs on August 10 at around 17:49 Universal Time, when the Moon will be 356,896 kilometers (221,765 miles) away. As it happens, this is only a few minutes before the time of peak full Moon at 18:10 UT, when the Moon's ecliptic longitude differs from the Sun's by exactly 180 degrees.

How often does this happen? The period between perigees, called the anomalistic month, is 27.55 days, on average, while the time between Full Moons, called the synodic month, is 29.53 days. These two periods sync up every 413 days, or 1.13 years. 15 anomalistic months are about as long as 14 synodic months, so that's how often the pattern repeats.

Recently, a much broader definition of "supermoon" has taken hold. It includes both Full and New Moons, and perigee merely needs to be "close enough," generally within a couple of days. By this definition, there are six or seven supermoons every year, half of which can't be observed. Not so super!

The actual shape of the Moon's orbit is another source of confusion. The orbit is often depicted as an almost cigar-shaped ellipse, but this is a misleading exaggeration. If you were to draw the orbit on a sheet of paper, its deviation from a perfect circle would be less than the thickness of your pencil point. The 50,000 kilometer (30,000 mile) difference between perigee and apogee is almost entirely due to the orbit being off-center. The difference between the semimajor and semiminor axes is less than 1000 kilometers (600 miles).

The animation begins in mid-July, showing that perigee and Full Moon miss each other by about a day. It then shows apogee on July 28, when the Moon is almost 32 Earth diameters away. It ends on August 10, the day of the supermoon, when the distance to the Moon is 28 Earth diameters. The Moon graphic in the upper left shows the change in the Moon's apparent size as it moves closer and farther in its orbit. (The relative sizes of the Earth and Moon in the main orbit graphic are exaggerated by a factor of 15 to make them more easily visible.)
 

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Visualization Credits

Ernie Wright (USRA): Lead Animator
Claire Saravia (NASA/GSFC): Producer
David Ladd (USRA): Producer
Noah Petro (NASA/GSFC): Scientist
Michelle Thaller (NASA/GSFC): Scientist
Laurence Schuler (ADNET Systems Inc.): Project Support
Ian Jones (ADNET Systems Inc.): Project Support
Please give credit for this item to:
NASA's Scientific Visualization Studio

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Mission:
LRO (Lunar Reconnaissance Orbiter)

Data Used:
LRO/LROC/WAC 643nm High Sun Global Mosaic
JPL DE421
LRO/LOLA/Digital Elevation Map
Note: While we identify the data sets used in these visualizations, we do not store any further details nor the data sets themselves on our site.

This item is part of these series:
The Moon
LRO - Animations

Keywords:
SVS >> Elevation data
SVS >> HDTV
SVS >> Laser Altimeter
SVS >> Lunar
SVS >> Moon
SVS >> Orbit
SVS >> Lunar Reconnaissance Orbiter
SVS >> LOLA
SVS >> LROC
SVS >> Lunar Surface
SVS >> Lunar Topography
SVS >> Lunar Elevation Map
NASA Science >> Planets and Moons