As of September 18, 2015, the launch time window for Telstar 12 VANTAGE on November 24, 2015 was 15:23 through 17:07 JST and the reserved launch period was November 25 through December 31, 2015.
As of September 18, 2015, the launch of Telesat's Telstar 12 VANTAGE aboard H-IIA Launch Vehicle No. 29 (H-IIA F29) was scheduled for November 24, 2015 (Japan Standard Time).
As of November 22, 2015, the launch time for Telstar 12 VANTAGE aboard H-IIA F29 was set to 15:23 JST with a launch window of 15:23 through 17:07 JST on November 24, 2015.
The H-IIA launch vehicle configuration for the Telstar 12 VANTAGE mission was H2A204 with a 4 meter payload fairing and an upgraded second stage configuration (KOHDO-KA).
The H-IIA F29 vehicle serial number for the Telstar 12 VANTAGE mission was F29 and the vehicle's second stage surface was painted white to reduce LH2 boil-off during the multi-hour coast for this mission.
Telstar 12 VANTAGE was planned to separate approximately 4 hours and 27 minutes after liftoff in the visible range of the Santiago ground station.
Public documents associated with the mission listed Telstar 12 VANTAGE payload mass as approximately 4,900 kilograms and a payload complement of 52 Ku-band transponders.