NVS-02 Satellite: The Indian Space Research Organisation (ISRO) is set to launch its 100th satellite on-board GSLV-F15 from Sriharikota on January 29.

• About: The launch of a 2,250-kg navigation satellite (NVS-02) into Geostationary Transfer Orbit (170 x 36,577 km).

o Second of five second-generation satellites developed to replace existing IRNSS satellites.

o Satellite Features: Equipped with Made-in-India atomic clocks for improved accuracy.

o Utilises L1 frequency (used in the US GPS) for better compatibility with smaller devices like fitness trackers with increased lifespan of 12 years.

• About IRNSS/NavIC System: A seven-satellite constellation providing positioning, navigation, and timing services over India and 1,500 km around.

o First satellite IRNSS-1A launched in 2013 with a 10-year mission life.

o Replacement needed for satellites with malfunctioning atomic clocks.

o Replacement satellite IRNSS-1H failed to reach orbit due to PSLV heat shield malfunction.