The payload propulsion duration problem?
The initial plan was to bring the payload to the predetermined delivery point, which was 19 hours away from when Capa realised Pinbacker was onboard the ship, before its thrusters would shoot it into the sun. Presumably Pinbacker stopped the ship soon after attacking Capa around 18- 19 hours away from where they were supposed ejected the payload into the sun.
Question: How did the payload make up this time/distance before being manually detonated by Capa from 18- 19 hours from the planned position (propulsion fuel problems given the planned time of payload propulsion was 4 minutes total)? And how would Capa know when to detonate the bomb manually given the distortion of space/time so close to the sun, making his judgement faulty?