Tonight's Sky
Sun
Sun
Moon
Moon
Mercury
Mercury
Venus
Venus
Mars
Mars
Jupiter
Jupiter
Saturn
Saturn

Tonight's Sky — Change location

OR

Searching...

Tonight's Sky — Select location

Tonight's Sky — Enter coordinates

° '
° '

Pack extra sunscreen

Three bright suns populate the sky of a newly discovered extrasolar planet.
Triple suns
This artist's conception shows the three suns and the newly discovered Jupiter-size world from the perspective of a hypothetical moon orbiting the planet. The large yellow sun is already halfway over the horizon, but the orange and red suns are still visible in the sky. Scroll down below to see a movie featuring this system.
Caltech
July 13, 2005
Movie buffs may remember Luke Skywalker gazing at a pair of setting suns during Star Wars: A New Hope. Did filmmaker George Lucas apply artistic license by creating an improbable horizon? With the discovery of a new exoplanet, it appears Lucas exercised restraint by limiting the scene to 2 suns.
Maciej Konacki, a planetary scientist from the California Institute of Technology, discovered an exoplanet orbiting the main body of the triple-star system HD 188753. The 3 stars are located approximately 149 light-years from Earth in the constellation Cygnus. A gap comparable to the distance between the Sun and Saturn — about 888 million miles (1.43 billion kilometers) — separates the stars from one another. An observer on this planet, slightly larger than Jupiter, would see three bright suns in the sky. The larger yellow star that the exoplanet orbits every 3.5 days would dominate the sky, however.

Using the High Resolution Echelle Spectrometer on the 10-meter Keck Telescope atop Mauna Kea, Hawaii, Konacki took an initial spectrum of this system in August 2003. Konacki's survey measured velocities of bodies in close-binary and close-multiple-star systems. After looking at the HD 188753 system, Konacki suspected a planet was present, and it was revealed during an examination of the data last fall.

Planetary scientists are excited about this discovery because it raises questions about planet formation and planet-sun relationships.

"If we believe that the same basic processes lead to the formation of planets around single stars and components of multiple stellar systems, then such processes should be equally feasible, regardless of the presence of stellar companions," explains Konacki. "Planets from complicated stellar systems will put our theories of planet formation to a strict test."

Maciej Konacki's report on the HD 188753 system appears in the July 14 Nature.
Downloadable File(s)
0

JOIN THE DISCUSSION

Read and share your comments on this article
Comment on this article
Want to leave a comment?
Only registered members of Astronomy.com are allowed to comment on this article. Registration is FREE and only takes a couple minutes.

Login or Register now.
0 comments
ADVERTISEMENT

FREE EMAIL NEWSLETTER

Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter.

ADVERTISEMENT
ADVERTISEMENT
BoxProductcovernov

Click here to receive a FREE e-Guide exclusively from Astronomy magazine.

Find us on Facebook

Loading...