Sriharikota (Andhra Pradesh), Dec 23: The 24-hour countdown for the launch of ISRO’s heavy-lift rocket LVM3-M6, carrying the next-generation U.S. communication satellite Bluebird Block-2, began at the spaceport in Sriharikota on Tuesday, the Indian Space Research Organisation (ISRO) said.
The rocket is scheduled to blast off at 8:54 am on Wednesday from the second launch pad as part of a dedicated commercial mission. Weighing 6,100 kg, the Bluebird Block-2 will be the heaviest payload ever placed into low Earth orbit (LEO) by an LVM3 launcher, surpassing the previous record of 4,400 kg set by the LVM3-M5 Communication Satellite 03 mission on November 2.
This launch is being carried out under a commercial agreement between NewSpace India Ltd (NSIL) — the commercial arm of ISRO — and US-based AST SpaceMobile (AST & Science LLC). The mission aims to deploy a state-of-the-art communication satellite designed to deliver direct high-speed cellular broadband to smartphones globally.
AST SpaceMobile is developing the world’s first space-based cellular broadband network, intended to connect standard mobile phones directly to satellites for both commercial and government applications.
Ahead of the launch, ISRO Chairman V. Narayanan visited the Sri Venkateswara Swamy Temple in Tirumala and offered prayers.
Standing 43.5 metres tall, the LVM3 — also known as the Geosynchronous Satellite Launch Vehicle MkIII — is a three-stage rocket powered by a cryogenic engine developed by ISRO’s Liquid Propulsion Systems Centre. It uses two S200 solid rocket boosters, designed by the Vikram Sarabhai Space Centre, to generate the massive thrust needed for liftoff.
After a flight of approximately 15 minutes, the Bluebird Block-2 satellite is expected to separate from the vehicle. It forms part of a global LEO constellation that will provide continuous 4G and 5G connectivity — enabling calls, messaging, and data services anywhere in the world.
With a 223-square-metre phased array antenna, the Bluebird Block-2 is set to become the largest commercial communications satellite ever deployed in low Earth orbit, approximately 600 km above Earth.
AST SpaceMobile has already launched five satellites (BlueBird 1–5) in September 2024, offering continuous internet coverage across the United States and select regions. The company plans to expand its constellation further in collaboration with over 50 global mobile network operators to enhance space-based broadband connectivity worldwide.
