Final answer:
The HEAA rocket encasement is marked with a yellow color band.
Step-by-step explanation:
The HEAA rocket encasement is marked with a yellow color band. If there have been updates or changes since my last knowledge update, I recommend checking with official sources associated with the relevant space agency or organization involved in the design and launch of the HEAA (High Energy Astronomy Observatory) or related missions. Information about rocket components and their color codes may be available in technical documentation, launch vehicle specifications, or aerospace engineering resources.