The Skull-Shaped Asteroid That Snuck Up On Halloween

When an asteroid shaped like a human skull zoomed past Earth on Halloween in 2015, the timing felt like a cheap holiday gimmick. Designated 2015 TB145 and quickly dubbed the Great Pumpkin by NASA, the spooky space rock missed our planet by 300,000 miles and posed no actual threat. The real fright came not from its close brush, but from how late we noticed it.

Astronomers at Hawaii's Pan-STARRS observatory caught the object just three weeks before its flyby, and its unsettling skeletal shape remained entirely unknown until radar images emerged the day before Halloween. That narrow warning window highlights a persistent vulnerability in how we track near-Earth objects. NASA's Jet Propulsion Laboratory noted at the time that this was the closest known approach by an object of that size until a future flyby scheduled for August 2027.

Programs like Spaceguard actively catalog these bodies and project their paths, yet sneaking up on us is apparently routine for visitors of this scale. Our read is that the true hazard of near-Earth space is not an inevitable catastrophic strike, but our chronic inability to spot large interlopers until they are practically on our doorstep.

While the skull asteroid returned for a much safer pass at 24 million miles away in 2018, the initial surprise of its 2015 arrival lingers.

As automated observatories scan the dark, watch whether our detection timelines improve before the next unexpected visitor drops by unannounced.