Finish the upper stage’s flight

After cargo-spacecraft separation, the upper stage still exists. Its remaining energy and orbital path need an end-of-flight plan. JAXA’s June 2012 project-manager account reports a successful controlled second-stage reentry test on H-IIB Flight 2 in January 2011. That test concerned the used rocket stage, not the HTV-2 spacecraft approaching the station.

The Flight 2 photograph shows the launch that began this sequence. It cannot show the later disposal maneuver. Link the image to its flight identity, then use the dated technical account for the reentry result. A real photograph and a later mission report answer different questions about the same flight.

In general, a deorbit maneuver changes an orbit so that the object encounters denser atmosphere. A suitable retrograde burn can lower the opposite side of an orbit. Planning controlled reentry means choosing and verifying the path and end conditions; it is not simply turning an engine off and assuming the object falls straight down.

The disposal goal is also distinct from landing hardware intact for reuse. A stage can complete a controlled ocean reentry without being reusable. Likewise, HTV’s later departure and disposal are not the upper stage’s reentry. They involve different vehicles, timelines and mission responsibilities.

H-IIB flew nine times from 2009 through May 2020, carrying the nine HTV missions. MHI’s completed launch register records successful outcomes for all nine. This describes the observed launch campaign, not a mathematical guarantee of zero risk or proof that every subsequent spacecraft experiment achieved every objective.

Read a program review at several levels: the launch requirement, the recorded deliveries, improvements made between flights and end-of-flight responsibilities. H-IIB’s legacy includes applying inherited technology to a larger cargo-launch system. Later transport programs need their own configuration and flight evidence, while the original H-family survey remains a useful introduction to the lineage.