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The night sky in 37,440 exposures

Posted: May 12, 2011 - 7:50pm
In this 2010 photograph provided by Nick Risinger of Skysurvey.org, Risinger is shown in Colorado, setting up a rack of six synchronized cameras for a night of photographing the night sky. Risinger eventually created an image of the entire night sky in a composite photograph made from more than 37,000 exposures taken in different locations all over the world. Risinger traveled more than 60,000 miles by air and land and spent more than a year to produce the photo. (AP Photo/Courtesy Nick Risinger, Skysurvey.org) MANDATORY CREDIT; NO SALES; NO ARCHIVE; FOR USE ONLY WITH STORY PROFILING THE PHOTOGRAPHER   Nick Risinger
Nick Risinger
In this 2010 photograph provided by Nick Risinger of Skysurvey.org, Risinger is shown in Colorado, setting up a rack of six synchronized cameras for a night of photographing the night sky. Risinger eventually created an image of the entire night sky in a composite photograph made from more than 37,000 exposures taken in different locations all over the world. Risinger traveled more than 60,000 miles by air and land and spent more than a year to produce the photo. (AP Photo/Courtesy Nick Risinger, Skysurvey.org) MANDATORY CREDIT; NO SALES; NO ARCHIVE; FOR USE ONLY WITH STORY PROFILING THE PHOTOGRAPHER

SEATTLE — Nick Risinger has always gazed up at the sky. But last year the amateur astronomer and photographer quit his day job as a Seattle marketing director and lugged six synchronized cameras about 60,000 miles to capture an image of the entire night sky.

Risinger, 28, set up his rack of cameras in high-elevation locales in the Western U.S. and South Africa, timing photo shoots around new moons when nights were long and dark. He programmed his six cameras to track the stars as they moved across the sky and simultaneously snapped thousands of photos.

He then stitched 37,440 exposures together into a spectacular, panoramic survey sky that he posted online two weeks ago. The photo reveals a 360-degree view of the Milky Way, planets and stars in their true natural colors. Viewers can zoom in on portions of the 5,000-megapixel image to find Orion or the Large Magellanic Cloud.

“I wanted to share what I thought was possible,” said Risinger, a first-time astrophotographer. “We don’t see it like this. This is much brighter. On a good night in Seattle, you’ll see 20 or 30 stars. This, in its full size, you’ll see 20 to 30 million. Everything is amplified.”

Other sky surveys have preceded this one, including the Digitized Sky Survey, a source for Google Sky. Many serve scientific purposes and were shot in red and blue to measure the temperature of stars, Risinger said. He shot in a third color, green, to give the photo added depth and richness, he said.

“What a labor of love it is!” said Andrew Fraknoi, senior educator at the Astronomical Society of the Pacific. “Professional astronomers are now doing much deeper surveys of small regions of the sky, using big telescopes. But every once in a while it’s nice to step back and have such a beautiful photographic record of the whole sky.”

“This is not a scientifically useful image. This is for educational and artistic appreciation,” Risinger said, adding that he wasn’t motivated by money but hopes to sell prints and other products to keep the website running.

To capture the entire night sky in a year, Risinger plotted out an exact schedule of images he needed from both the northern and southern hemisphere. He divided the sky into 624 uniform sections and entered those coordinates into the computer.

“The sheer amount of work was mind-boggling,” he said at his apartment in Seattle. “It’s not a wing-it kind of project. You have to plan how you’re going to get the entire sky. And you do that by dividing it up into pieces and knowing what time you need to collect those pieces because as the Earth goes around the Sun, things come in and out of view.”

In March of last year, Risinger and his older brother, Erik, traveled to the desert near Tonapah, Nev., and took the first photos of what eventually would become his Photopic Sky Survey.

When he realized the work was too monumental, Risinger quit his day job as a marketing director of a countertop company to devote himself full-time to the project. He also persuaded his retired father, Tom, who lives in Gig Harbor, Wash., to join him.

“Making an atlas of the night sky is something that mostly professional astronomers would have done in the past,” said Fraknoi, who is also chairman of the astronomy department at Foothill College in Los Altos Hills, Calif. “With new computer tools at our disposal, it’s remarkable what amateur astronomers can discover.”

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