Help Shape the Future of Space Exploration

Join The Planetary Society Now  arrow.png

Join our eNewsletter for updates & action alerts

    Please leave this field empty

Headshot of Emily Lakdawalla

Who's got the biggest panels?

Posted by Emily Lakdawalla

28-09-2007 17:45 CDT


A reader wrote in to me to point out that Marc Rayman has been (frequently) quoted incorrectly as saying that Dawn had the largest solar panels of any planetary mission. Dawn's panels, at almost 20 meters tip-to-tip, are the largest that NASA has ever sent beyond Earth, but they don't beat ESA's Rosetta spacecraft, whose solar panels stretch 32 meters tip-to-tip.

That reminded me of a project I'd meant to start on some time ago, to compare the sizes of various spacecraft. Here's a few spacecraft of current interest. Compare and you can see that the real winner for solar panel size is the International Space Station; but Dawn and Rosetta are really pretty big as well. All of these images are at a scale of 20 centimeters per pixel. Poor little Spirit is barely visible at this scale.

Dawn at a scale of 20 cm per pixel
Hayabusa at a scale of 20 cm per pixel
MER at a scale of 20 cm per pixel
Rosetta at a scale of 20 cm per pixel
Voyager at a scale of 20 cm per pixel
MRO at a scale of 20 cm per pixel
Mars Recon
Space Station at a scale of 20 centimeters per pixel
Space station (as it appeared in September 2006)

It takes a little work to figure out how to scale the pictures, because you have to figure out the size of some element of the spacecraft that you can scale it to. Even if you know the length of the solar panels, that usually doesn't help because the image of the spacecraft is usually from an oblique perspective so that the solar panels are foreshortened. Fortunately, nearly every spacecraft has a circular high-gain antenna, and they usually report the diameter of that antenna somewhere. So, no matter what perspective the view of the spacecraft is from, you can get a diameter for the antenna to use to scale the image to.

See other posts from September 2007


Or read more blog entries about:


Leave a Comment:

You must be logged in to submit a comment. Log in now.
Facebook Twitter Email RSS AddThis

Blog Search


Advocate for Space!

Fifteen years ago, Society members and passionate space advocates like you helped save the Pluto mission. Now we can do the same for missions to Europa and Mars.

Join over 27,600 people who have completed their petition and consider a donation to support advocacy efforts.

Sign Our Petition

Featured Images

LightSail-B on the bench
Blue Origin New Shepard after first landing
New Shepard test flight and booster landing
Suni Williams and Doug Hurley in Crew Dragon
More Images

Featured Video

MISSIONS: Dawn In The Asteroid Belt With Marc Rayman

Watch Now

Space in Images

Pretty pictures and
awe-inspiring science.

See More

Selfies to Space!

Take flight with a selfie on LightSail™ in 2016!

Send a Selfie Now

Connect With Us

Facebook! Twitter! Google+ and more…
Continue the conversation with our online community!