Double Spaceship Sighting Alert!

Space shuttle Endeavour will undock from the ISS on late Friday (7:54 p.m. EST) or early Saturday (00:54 GMT) depending where you live, providing an opportunity to see the two spaceships flying in tandem. This is an incredible sight, and as the shuttle program comes to a close, one that will happen only about four more times. Early morning sightings are favored for those in the northern hemisphere. The two spacecraft will be seen as separate but closely-spaced points of light. The ISS is bigger, so will appear as the brighter object trailing the smaller Endeavour as they move across the sky. Double flybys will continue until the shuttle lands, currently scheduled for late Sunday or early Monday, with the two getting farther apart each day. Of course, your viewing ability will depend on cloud cover. Above, you can watch the ceremony as the shuttle crew returned to Endeavour and closed the hatches from the ISS.

To find out if you’ll be able to see spaceships in your area, there are a few different sites to check out:

NASA has a Skywatch page where you can find your specific city to look for satellite sighting info.

Spaceweather.com, has a Satellite Tracker Tool. Just put in your zip code (good for the US and Canada) to find out what satellites will be flying over your house.

Heaven’s Above also has a city search, but also you can input your exact latitude and longitude for exact sighting information, helpful if you live out in the country.

Seeing the two spacecraft flying closely in tandem is a very unique and thrilling sight. Good luck!