Anyone watching but me?
Launch is now 45 minutes away. The Atlas 5 rocket stands 191 feet tall and weighs 746,061 pounds fully loaded with propellant.
This launch will mark the first Atlas 5 launch of the year.
The Atlas 5's most recent launch Nov. 18 lofted NASA's Mars Atmosphere and Volatile Evolution, or MAVEN, mission to the red planet.
United Launch Alliance plans nine Atlas 5 missions this year. Two of those launches will be with NASA payloads, including tonight's launch of TDRS L.
The next Atlas 5 launch is set for March 25 with a classified payload for the National Reconnaissance Office.