Obama seeks space weapons ban

By Andrea Shalal-Esa

WASHINGTON (Reuters) - President Barack Obama's pledge to seek a worldwide ban on weapons in space marks a dramatic shift in U.S. policy while posing the tricky issue of defining whether a satellite can be a weapon.

Moments after Obama's inauguration last week, the White House website was updated to include policy statements on a range of issues, including a pledge to restore U.S. leadership on space issues and seek a worldwide ban on weapons that interfere with military and commercial satellites.

It also promised to look at threats to U.S. satellites, contingency plans to keep information flowing from them, and what steps are needed to protect spacecraft against attack.

The issue is being closely watched by Lockheed Martin (LMT.N), Boeing (BA.N), Northrop Grumman (NOC.N), the biggest U.S. defence contractors, and other companies involved in military and civilian space contracts.

Watchdog groups and even some defence officials welcomed the statement, which echoed Obama's campaign promises, but said it would take time to hammer out a comprehensive new strategy.

Enacting a global ban on space weapons could prove even harder.

For instance, it was difficult to define exactly what constituted a "weapon" because even seemingly harmless weather tracking satellites could be used to slam into and disable other satellites, said two U.S. officials involved in the area who were not authorized to speak publicly.

Michael Krepon, co-founder of the private Henry L. Stimson think tank on space, cited recent reports that the Pentagon was using two smaller satellites launched in 2006 to fly near a dead missile-warning satellite and investigate what happened. The Defense Support Program satellite, DSP-23, built by Northrop, failed on orbit in mid-September.