Kepler Finds a Very Wobbly PlanetDate: 02/04/2014
Category: Mission News & Science
By: Andy Shaner
Imagine living on a planet with seasons so erratic you would hardly know whether to wear Bermuda shorts or a heavy overcoat. That is the situation on a weird, wobbly world found by NASA's planet-hunting Kepler space telescope.The planet, designated Kepler-413b, precesses, or wobbles, wildly on its spin axis, much like a child's top. The tilt of the planet's spin axis can vary by as much as 30 degrees over 11 years, leading to rapid and erratic changes in seasons. In contrast, Earth's rotational precession is 23.5 degrees over 26,000 years. Researchers are amazed that this far-off planet is precessing on a human timescale.
Kepler 413-b is located 2,300 light-years away in the constellation Cygnus. It circles a close pair of orange and red dwarf stars every 66 days. The planet's orbit around the binary stars appears to wobble, too, because the plane of its orbit is tilted 2.5 degrees with respect to the plane of the star pair's orbit. As seen from Earth, the wobbling orbit moves up and down continuously.
Kepler finds planets by noticing the dimming of a star or stars when a planet transits, or travels in front of them. Normally, planets transit like clockwork. Astronomers using Kepler discovered the wobbling when they found an unusual pattern of transiting for Kepler-413b.
"Looking at the Kepler data over the course of 1,500 days, we saw three transits in the first 180 days -- one transit every 66 days -- then we had 800 days with no transits at all. After that, we saw five more transits in a row," said Veselin Kostov, the principal investigator on the observation. Kostov is affiliated with the Space Telescope Science Institute and Johns Hopkins University in Baltimore, Md. The next transit visible from Earth's point of view is not predicted to occur until 2020. This is because the orbit moves up and down, a result of the wobbling, in such a great degree that it sometimes does not transit the stars as viewed from Earth.
Astronomers are still trying to explain why this planet is out of alignment with its stars. There could be other planetary bodies in the system that tilted the orbit. Or, it could be that a third star nearby that is a visual companion may actually be gravitationally bound to the system and exerting an influence.
"Presumably there are planets out there like this one that we're not seeing because we're in the unfavorable period," said Peter McCullough, a team member with the Space Telescope Science Institute and Johns Hopkins University. "And that's one of the things that Veselin is researching: Is there a silent majority of things that we're not seeing?"
Even with its changing seasons, Kepler-413b is too warm for life as we know it. Because it orbits so close to the stars, its temperatures are too high for liquid water to exist, making it inhabitable. It also is a super Neptune -- a giant gas planet with a mass about 65 times that of Earth -- so there is no surface on which to stand.
NASA's Ames Research Center at Moffett Field, Calif., is responsible for the Kepler mission concept, ground system development, mission operations and science data analysis. NASA's Jet Propulsion Laboratory in Pasadena, Calif., managed Kepler mission development. Ball Aerospace & Technologies Corp. in Boulder, Colo., developed the Kepler flight system and supports mission operations with the Laboratory for Atmospheric and Space Physics at the University of Colorado in Boulder. The Space Telescope Science Institute in Baltimore archives, hosts and distributes Kepler science data. Kepler is NASA's 10th Discovery mission and was funded by the agency's Science Mission Directorate.
For images and more information about Kepler-413b, visit:
For more information about the Kepler space telescope, visit:
http://www.nasa.gov/kepler comments powered by Disqus
More Community Corner
2014 Humans in Space Art Video Challenge (07/30/2014)
Nominations Invited for I Love My Librarian Award (07/30/2014)
Cassini Spacecraft Reveals 101 Geysers (07/30/2014)
NASA Prepares Mars Spacecraft for Close Comet Flyby (07/30/2014)
NASA Teams with Slooh to Help Protect Earth (05/22/2014)
Construction to Begin on 2016 NASA Mars Lander (05/20/2014)
The Incredible Shrinking Giant Red Spot! (05/15/2014)
How Does Your Garden Glow? (05/05/2014)
Cassini Spies the Ice-Giant Planet Uranus (05/01/2014)
NASA Spinoffs: Space in our Daily Lives (04/28/2014)
Goodbye, LADEE! Thanks for All the Science (04/18/2014)
NASA Celebrates Earth Day (04/18/2014)
Birth of a New Saturn Moon? (04/15/2014)
It's National Library Week! (04/15/2014)
Lunar Eclipes from a Different Perspective (04/11/2014)
April 15 Lunar Eclipse Resources (04/11/2014)
Live Streaming of April 14-15 Lunar Eclipse (04/11/2014)
Construction to Begin on OSIRIS-REx Spacecraft (04/10/2014)
Summer Reading Programs (04/10/2014)
NASA Space Assets Detect Ocean Inside Saturn Moon (04/03/2014)
That Sinking Feeling (03/10/2014)
NASA Seminar Series on Near-Earth Asteroids (03/04/2014)
Tournament Earth 2014 (03/03/2014)
ALA/LPI Marvel Moon Webinar (03/03/2014)
Kepler Finds a Very Wobbly Planet (02/04/2014)
NASA Preparing for 2014 Mars/Comet Watch (01/29/2014)
Herschel Telescope Detects Water on Dwarf Planet (01/28/2014)
Send Your Name to an Asteroid! (01/15/2014)
A (LEGO) Model Spacecraft (01/15/2014)
NASA Spacecraft Spots Its First New Asteroid (01/08/2014)
NASA, NASM Host 10-Year Mars Rover Events (01/07/2014)
Astronaut New Year's Greeting (01/02/2014)
NASA Sends New Year’s Greeting to NYC (12/30/2013)
GLOBE at Night Citizen Science (12/17/2013)
Contest: NASA’s REEL Science Videos (12/17/2013)
NASA Brings 'Big Data' to the Cloud (11/12/2013)
NASA MAVEN Prepares to Launch for Mars! (11/11/2013)
LADEE LIFTS OFF for the MOON! (09/11/2013)
New Set of Explore Science Activities (09/05/2013)
International Observe the Moon Night (InOMN) 2013! (08/22/2013)
Dig It! The Secrets of Soil (01/18/2013)
NASA's New Worlds, New Discoveries (01/17/2013)
Liftoff! Juno Mission Launched to Jupiter & Updates (01/08/2013)