of Ground Tracks and Events Summary
Track Data Source: STS-107 GPS State Vector
Time Line Source: STS-107 Accident Investigation Master
Revision 13, dated 02/15/03 7:00 a.m. CST, from the Integrated
latitudes and longitudes are plotted on the map at 0.96
second time intervals,
although there are numerous data dropouts. The symbol used
for points from the trajectory
data file is a red dot.
time tags of events from the Master Timeline sometimes fall
between trajectory data
points, and in some cases they occur during GPS data dropouts.
In these cases, the correct
location of the event is indicated by a blue dot.
of the contents of Note Boxes:
Header – Greenwich Mean Time (GMT) of the event and the
Event Sequence Number from the Master Time Line (in parentheses)
Latitude and W. Longitude of the event (red dots only) in
description and remarks from the Master Time Line (augmented
by text boxes as required)
Altitude (H, ft) & Mach Number (Mach), interpolated when
nominal events have been intentionally omitted
that cover a range of times, or have a range of uncertainty
greater than one second in the time tag, the time in the header
is the center of the time span, followed by the comment “Center”
in parentheses. For example, the time in the header for event
100 is shown as “14:00:04 GMT (Center).” The entire range
of times is given in the note box text just before the event
description. This is a change from previous versions of the
ground track/time line maps, which put the earliest time in
the note box header.
Loss-Of-Signal Ground Track Data Source: The Descent Analysis
Group (DM42) produced a ballistic trajectory for a hypothetical
object with a Ballistic Number of 220.0 lb/ft2. This trajectory
was propagated from 13:59:37.00 GMT to ground impact at 14:03:34
GMT in Louisiana. One second time steps are shown. The symbol
used for post-LOS trajectory data is a yellow dot. An update
to the reference trajectory is pending.
post-LOS ground track is used here as a reference to locate
post-LOS time line events and visual sighting data on the
map background. It must be emphasized
that the post-LOS ground track is provided as a reasonable
visual reference only, and does not represent the actual trajectory
of any known piece of the vehicle.
of a ground observer is indicated by a turquoise triangle.
location note box headers contain the NASA sighting number
and the observing site name.
note boxes also contain the Latitude and Western Longitude
of the observer, and
Acquisition-Of-Sighting (AOS) and Loss-Of-Sighting (LOS) times
(GMT). AOS and LOS
times do not represent horizon break, but are the actual beginning
and ending times of the
observer’s video coverage.
sighting, the period of observation is indicated on the map
by a colored region bounded by the lines-of-sight from the
observer to the ground track at AOS and LOS.
colored regions overlap, one color overlays the other, but
the AOS or LOS line-of-sight of the underlying region is indicated
by a thick line of the underlying color.
cases AOS or LOS points associated with specific sightings
are labeled using note boxes. This is done for clarity when
needed, usually if the sighting location does not appear on
the same map with its AOS or LOS point.
maps show the locations of four sightings that occurred after
Loss-Of-Signal with the vehicle, when no GPS ground track
data were available. Sighting lines-of-sight are shown with
respect to the hypothetical reference post-LOS ground track
(PDF 65 Kb)
file of these images (3.6 Mb)