The Indian space agency on Saturday is likely to successfully launch two Singaporean satellites with its Polar Satellite Launch Vehicle (PSLV), taking the total number of foreign satellites put into orbit to 424. On April 22 afternoon, the core alone variant of the PSLV rocket (code named as PSLV-C55) will be carrying two Singaporean earth observation satellites - TeLEOS-2 weighing 741 kg, and the 16 kg Lumilite-4. These two apart, there will be seven non-separable experimental payloads which would be part of the rocket's final stage (PS4). The Indian Space Research Organisation (ISRO) uses the final stage (PS4) of the PSLV rocket as an orbital platform for in-orbit experiments and has named it as PSLV Orbital Experimental Module (POEM).