To fully describe a human spaceflight mission we need to consider
its different segments, allowing for transfer of astronauts
from one ship to another and for stays aboard space stations.
A stay aboard a space station is called an
expedition.
Expeditions are also assigned mission tags; they are kept in a
separate file to make the task of counting `number of human space mission
launches' simpler. The expeditions file is
expeditions.html
In the simple case, the space station mission has three segments:
the ferry ship from launch to docking, the expedition from docking
to undocking, and the ferry ship from undocking to landing. However
more complicated situations exist, where a ferry ship docks to add
crew to an existing expedition, or where the expedtion ends with
cremembers remaining on board and reassigned to a new expedition.
Therefore, the start and end times of the expedition are not necessarily
the start and end times of a particular crew member's stay on the station.
The third set of mission tags are called the
auxiliary missions
list. This is for spacecraft which are launched without anyone aboard
but are later occupied. A particular case of interest here is that of the
Apollo lunar modules. The auxlilary missions are listed in
auxmissions.html
All these mission tag file have the same format. The columns are:
Human spaceflights (flights which carried one or more
humans above 80 km) are given IDs with a 5-digit running number prefixed by 'H'.
Human spaceflight aborts and failures which did not reach 80 km are given
a 4-digit running number prefixed by 'HA'. These aborts do not include
countdowns scrubbed (cancelled) on the ground prior to rocket ignition. They
do include pad aborts (where ignition occurred but no liftoff) and airplane-launch
drop aborts (where carrier plane takeoff occurred but no drop happened) as well
as launches which took off but failed to reach 80 km (notably, Shuttle mission 51-L).
Spaceflights by primate nonhumans are indexed with prefix 'HB'. For now,
only chimpanzee flights are included in this category.