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C2

\A/v V ^
TABLE OF CONTENTS
Page
LIST OF TABLES AND FIGURES

iii

ABSTRACT

iv

I.

INTRODUCTION

1

II.

PREDICTED FOOTPRINT

2

III.

RECONSTRUCTION OF SKYLAB FOOTPRINT

4

IV.

SUMMARY

7

V.

CONCLUSIONS

9

REFERENCES

19

ii

�LIST OF TABLES AND FIGURES
TABLE
1

PAGE
Recovered Skylab Debris

10

1

Predicted Skylab Reentry Scenario

12

2

Skylab Predicted Debris Footprint
Comparison

13

3

Relationship of Footprint Size to
Breakup Altitude and'BC

14

4

Skylab Altitude from NORAD Vectors

15

5

Skylab Debris Envelopes

10

6

Skylab Impact Corridor

-17

7

Map of Footprint

FIGURE

18

iii

�ABSTRACT
This report documents the location and extent of the impact
corridor of the Skylab vehicle. Included in this discussion
are summaries of the predicted breakup sequences and result­
ing footprint, methodology for reconstructing the actual
breakup sequence and footprint, and an assessment of the
overall impact footprint size.
Questions concerning information contained herein should be
directed to Marshall Space Flight Center, EL25, Lee Varnado,
AC 205, 453-1163.

iv

�I.

INTRODUCTION

When the Skylab vehicle reentered the earth's atmosphere
on July 11, 1979, a great deal of attention was, quite
naturally, focused on the question of where the surviv­
ing elements would impact- This report addresses that
question.
Included in this report are brief descriptions of the
predicted size of the impact area (footprint), the
reconstruction of the actual impact area, and some per­
tinent conclusions.

1

�II.

PREDICTED FOOTPRINT

In studies performed in 1970 and 1973, personnel of the
Lockheed Missiles and Space Company (LMSC) predicted that,
assuming, the Sky lab vehicle began to break up at 400,000 &lt;rfeet (65 nmi or 120 km), debris from the Solar Arrays
would begin to impact approximately 3600 nmi (6667 km)
downrange from the breakup point (See References 1 and 2).
This would define the "heel" of the impact footprint and
all other debris would impact downrange of this point.
The maximum distance any debris would travel, the "toe"
of the footprint, would be 7400 nmi (13705 km) from the
initial breakup point. Debris from the ATM was predicted
to impact in this area. Figure 1 shows the predicted
breakup sequence and associated altitudes, as forecast by
LMSC. This figure is only included to illustrate the
breakup sequence expected, and no significance should be
attached to the relative positions of the traces after
breakup, as it is not to scale.
Shortly before Skylab reentered, in preparing for the
footprint reconstruction activity, personnel from MSFC
(EL25) performed a brief reentry study to assess the
adequacy of our preparations. As a check, we compared our
impact dispersions with those from the LMSC study (using
the LMSC-predicted breakup sequence) and the results, with
one exception, were in reasonable agreement. The one ex­
ception was the ATM case, with MSFC predicting impact some
2500 nmi (4630 km) farther downrange than LMSC. This
difference could be accounted for by a difference in the
Coefficient of Drag (CQ) used in the two studies. Although
no detailed LMSC data are now available, one of the engi­
neers involved in the LMSC study recalled using a CD term
no smaller than 0.3 for the intact ATM. The MSFC-determined
CD for the ATM was 0.1, a difference which could easily
cause the downrange shift in the impact location. The
results of the two studies are compared in Figure 2.
This study also served to provide us with a priori knowledge
of the sensitivity of the footprint size to reentry parameters.
The size of the footprint is a function of both the breakup
altitude and the Ballistic Coefficient (BC) of the resulting
pieces. The BC of any element is a function of its mass (M),
area (A), and drag characteristics (CD) and is calculated:
BC =

M

CDA

For breakup at any specified altitude, elements with
greatly different BC's will produce a larger footprint than

2

�elements whose BC's are substantially the same. Also, given
a set of BC's, breakup at higher altitudes will create a
larger footprint than if these same elements break up at a
lower altitude. The sketches in Figure 3 illustrate this
relationship; however, this generality must be applied to
Skylab with some caution. Due to the nature of the vehicle,
the aerodynamic characteristics change markedly each time an
element separates from the OWS. For example, when the OWS
and ATM Solar Arrays separated, the mass loss was more than
offset by the reduced area, with the result that the BC
actually increased. This moved the impact point of the re­
maining elements farther downrange.
The problem of estimating impact location is complicated by
the fact that each time a breakup event occurs, a new BC
for the resulting elements must be determined. The general
philosophy we used was to determine the trajectory of each
major element (Solar Arrays, OWS, ATM, etc.) to a specified
breakup altitude, then run only the resulting pieces with
the smallest and largest BC's (taken from the LMSC reports)
to impact. This defined the expected limits of each major
element without requiring undue amounts of computer time or
manpower. The same philosophy was used in the footprint
reconstruction activity which is discussed in the succeeding
paragraphs.

3

�III.

RECONSTRUCTION OF SKYLAB FOOTPRINT

As has already been pointed out, the length of the impact
footprint is determined by the altitude at which an element
breaks up and the Ballistic Coefficients of the resulting
pieces. Since LMSC had previously estimated, in References
1 and 2, the BC's of the major assemblies (OWS, ATM, AM, IU),
the prime concern was to define the altitude(s) at which
these assemblies began to break up. It should be emphasized
that this activity, while based on available data, is still
somewhat of an art and not purely analytical, due to the
lack of precise event timing,uncertainty about size and
shape of elements after breakup, and the accuracy limits of
observations. Essentially, the procedure was to adjust the
breakup altitudes so that the predicted BC's resulted in
reentry profiles which agreed with the available data.
Data used to reconstruct the reentry history came from
several sources. They were:
o

Special perturbation vectors from NORAD

o

Tracking from the radars at Bermuda and Ascension
Islands on the final revolution

o

Telemetry data while over Ascension and Bermuda
Islands

o

Special altitude observations from NORAD

o

Locations of recovered debris

In addition to the above data, state vectors provided by
NORAD, especially those received in the final 24 hours, were
assessed to insure continuity of the trajectory. The follow­
ing paragraphs describe in more detail the data used and how
it affected the footprint determination.
During the 48 hours prior to reentry, a very important
source of data was the special state vectors provided by
NORAD. These vectors differed from the standard vectors in
that they were determined from fewer sets of tracking data
and thus were not as strongly influenced by the effects of
long-term perturbations, such as solar activity. The im­
portance of these vectors is that they were used to help
determine the time at which any maneuver to shift the
probable impact point should be initiated. This determina­
tion was made possible by analyzing the family of impact
points resulting from these vectors. The initial reconstruc­
tion activity used these predicted impact points before other
data was available to help assess the probability of a

4

�specific breakup sequence. These state vectors also proved
valuable in helping determine the aerodynamic profile affect­
ing the vehicle as it approached the reentry altitude. The
altitude history derived from these vectors is shown in
Figure 4. This altitude profile fit our reconstruction very
well and increased our confidence that we had a good estimate
of the altitude profile to begin the analysis which was based
on the T—7 hrs NORAD vector.

:

Sets of tracking data were provided by the Bermuda and
Ascension Island radars on the final revolution. Data from
these trackers indicated an altitude of approximately 62 nmi
(115 km) and 57 nmi (105 km) respectively, over these sites.
Each of these trackers reported contact with a single target
during their observation; this would indicate that separation
of the ATM from the OWS had not occurred, at least down to
57 nmi (105 km). This is a significant point, since footprint
^ predictions had been predicated on breakup beginning at 65 nmi
(120.4 km).
Further confidence in a later-than-expected breakup was pro­
vided by analyzing downlinked electronic data received while
the vehicle was over Bermuda. This data indicated that the
OWS and ATM solar arrays were still intact and functioning
at that point. It appears that sometime after the Bermuda
pass, and prior to Ascension acquisition, the OWS solar arrays,
while still attached, may have folded back against the OWS.
Analysis of the Ascension telemetry data supports this
conclusion since, during this pass, downlinked electrical
data indicated the OWS Array was still intact but no longer
yielding expected currents and voltages.
Subsequent to the tracking data provided by the Ascension
Island site, some special observations were received from
NORAD. These observations consisted of the altitude and
time at which various elements disintegrated. It is not
possible to concretely establish a relationship between the
observations and the specific element, but given other data
(aerodynamic characteristics, predicted breakup sequence,
and location of recovered pieces), it is possible to use
this data to support a probable sequence of events. The
procedure used was to construct theoretical breakup sequences
based on available data and then determine a "most probable"
sequence based on how well the altitude profile (vs. time)
of each fit these special observations. Figure 5 shows how
the ATM, OWS and AM debris envelopes from the most probable
breakup sequence compared to these observations. It is
clear from this data that nearly all of the observations are
contained within the OWS/IU/AM debris envelope. This further
supports the breakup sequence reconstruction.

5

�The final set of data available was the actual location of
recovered debris. While much of the debris impacted in the
Indian Ocean, several pieces were recovered on land. These
pieces were from the OWS and AM and were found in an area
within the reconstructed reentry corridor and between
Esperance and Rawlinna in Southwestern Australia. No debris
from the ATM has been recovered, and it is assumed that,
because of its higher BC, all this debris probably impacted
northeast of Rawlinna (See Figure 6). This is a very
sparsely settled area, practically inaccessible, and it is
doubtful if any of the ATM debris will ever be found.
Table 1 provides a list of the recovered pieces and their
location.

6

�mm

IV.

HI

SUMMARY

Analysis of all available data leads us to believe that
breakup of the Skylab assembly occurredat somewhat lower
altitudes- than predicted. While it is impossible to be
precise concerning the breakup sequence, the one deter­
mined by this effort, summarized below, does fit well with
all the data available to date.
The Solar Arrays, instead of breaking off cleanly, probably
folded back against the main structure, and remained attached
to a much lower altitude than expected before breaking off.
This served to reduce the size of the footprint, since the
minimum uprange point (the "heel") is determined by the
Solar Arrays impact. The actual breakup process probably -fadid not begin until approximately 54 nmi (100 km) altitude,
when the ATM and Solar Arrays separated from the OWS
assembly.
The ATM, which as a separate entity had a very high BC
compared to the other elements, traveled the greatest dis­
tance downrange, probably impacting northeast of Rawlinna
(dashed area on Figure 6). Failure to recover any ATM
debris makes this a somewhat hypothetical conclusion, but
the separation point is almost mandated by the better-known
reentry histories of other elements, discussed below, and
the resultant ATM trajectory is based on known aerodynamic
data. The failure to recover any ATM debris could well be
due to the probability that all of it impacted northeast of
Rawlinna. The special NORAD observations, shown in Figure 5,
do not fall within the ATM envelope resulting from this
analysis, indicating that those observations were the result
of OWS, IU, or AM debris. With the currently available data,
it is not possible to determine the point at which the ATM
itself began to break up and the length of the resulting
footprint (Figure 6 represents a maximum dispersion).
The IU and AM probably separated from the OWS around 44 nmi
(81.5 km). Locations of AM debris support this conclusion
and also indicate that this element probably did not break
up until near impact. Additional support is provided by the
relationships of the OWS, AM, and IU debris envelopes to the
special NORAD tracking observations, as shown in Figure 5.
Separation at altitudes different than 44 nmi (81.5 km)
do not fit these observations nearly so well. The location
of recovered debris indicates the OWS probably began break­
ing up around 42 nmi (77.8 km), which caused much of this
debris to impact in the Indian Ocean.

7

�• a table compares the -P^Se^edfcfe^
fe^fncHevllo^ by this analysts wrth th
sequence.

-

Predicted

IKES™
SSSSST.
Element
Solar Arrays

(nmi/Hm)

54/100
54/100

ATM
IU, AM/MDA

44/81.5

(nmi/km)

(nmi/km)

54/100

65/120.4

(1)

58/107. 4

(2)

48/88.9

42/77.8

45/83.3

UJKSU
(nmi/knO

65/120.4
45/83.3
48/88.9
45/83.3

OWS

(1)
(2)

• •
t data to estimate accurately,
insufficien
* Afferent BC's recovered xn nea
indicates bieahup near impact.

8

proximity

�V.

CONCLUSIONS

The reconstructed Skylab footprint begins with the impact
(theoretical) of the Solar Arrays' debris at 46.9S, 94.4E
and extends to 26.OS, 131.2E, the maximum distance expected
to be traveled by any of the surviving pieces. Figure 7
is included to illustrate the extent of the footprint, the
length of which is approximately 2140 nmi (3963 km),
1660 nmi (3074 km) less than predicted. The difference
is due to the lower-than-predicted occurrence of all the
separation and breakup events. The reluctance of Skylab
to break up not only reduced the size of the footprint, but
moved the entire footprint farther downrange than expected.
The absence of debris to pinpoint a "heel" (Solar Arrays)
or "toe" (ATM debris) precludes any concrete determination
of the footprint size, but the reentry sequence proposed
here fits all available data quite well. Thus, it appears
that the impact footprint described is a reasonable one.

9

�TABLE 1
RECOVERED SKYLAB DEBRIS

ITEMS

PROBABLE SOURCE

LOCATION

Charred Fragments

OWS

33.9S, 121.9E (In Esperance)

Burned Material

ows

33.9S, 121.9E (In Esperance)

Aluminum 356 Casting

OWS

33.7S, 122.IE (20 mi NE of
Experance)

Foam Fiberglass
Beam Section

OWS

33.9S, 122.0E (9 mi E of
Esperance)

H20 Tank

OWS

33.8S, 122.0E (9 mi NE of
Esperance)

OWS

33.9S, 122.IE (10 mi E. of
Esperance)

Aft End
H20 Tank
10' Steel Strip

OWS
(H20 Tank)

33.9S, 122.3E (25 mi E of
Esperance)

Heat Exchanger

OWS
(H20 Cooler)

33.9S, 122.IE (12 mi E. of
Esperance)

Segment of
Fiberglass Sphere

33.9S, 122.IE (11 mi E of
Esperance)

OWS

33.9S, 122.IE (11 mi E of
Esperance)

Insulation

OWS
(Bulkhead)

Aluminum Gear
and Housing

33.7S, 122.5E (40 mi NE of
OWS
Esperance)
(Urine Separator]

N2Tank

AM

33.2S, 122.6E (60 mi NE of
Esperance)

Electronics Module

AM

33.5S, 122.3E (35 mi NE of
Esperance)

N2Sphere

AM

33.5S, 122.8E (49 mi ENE of
Esperance in
Neridup area)

Pressure Tank

IU

33.2S, 122.6E (60 mi NE of
Esperance)

10

�TABLE 1 (Continued)
RECOVERED SKYLAB DEBRIS

ITEMS

PROBABLE SOURCE

LOCATION

Film Vault Door

OWS

32.4S, 123.9E (5.5 mi NE of
Balladonia)

02Tank

AM

31.IS, 125.3E (5 mi S of
Rawlinna)

0.,Tank

AM

31.IS, 125.2E (15 mi SW of
Rawlinna)

Steel Fragment

31.IS, 125.4E (5 mi SE of
AM
Rawlinna)
(Part of 02 Tank)

Steel Dome

AM
(02 Tank)

31.2S, 125.2E (15 mi SW of
Rawlinna)

11

�I

FIGURE 1 PREDICTED SKYLAB RE-ENTRY SCENARIO
12

'

*

��BC2 ( &gt; BC3)
BC3{ &gt; BC4)
B C 4 - MINIMUM BC

FIGURE3 RELATIONSHIP OF FOOTPRINT SIZE TO
BREAKUP ALTITUDE AND BC
14

��1
o

ID

1
o

1
o
CO

1
o
CM

16

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�There is a still caption on the back which reads: "Airlock zone 1 closeup of fan #3 mounted in AM circulation fan
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                    <text>�There is a still caption on the back which reads: "DAC 35157"

�There is a still caption on the back which reads: "DAC 36453"

�There is a still caption on the back which reads: "ASTRONAUT CONRAD SECURING INNER
CYLINDER OF TRASH DISPOSAL AIRLOCK. OWS NO-1."

�There is a still caption on the back which reads: "DAC 35158"

�There is a still caption on the back which reads: "DAC 35166"

�There is a still caption on the back which reads: "ASTRONAUT CONRAD INSPECTING TRASH
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�There is a still caption on the back which reads: "DAC 35170"

�There is a still caption on the back which reads: "DAC 35162"

�There is a still caption on the back which reads: "DAC 35168"

�There is a still caption on the back which reads: "DAC 35169"

�There is a still caption on the back which reads: "TRASH DISPOSAL AIRLOCK AFTER
EJECTION CYCLE WITH EJECTION DEVICE RETRACTED. OWS"

�There is a still caption on the back which reads: "EJECTION PLATE INSIDE THE TRASH
DISPOSAL AIRLOCK WITH OUTBOARD HATCH IN OPEN POSITION. OWS INPUT FOR
SEPT 1971."

�There is a still caption on the back which reads: "TRASH BAG BEING EJECTED BY EJECTION
DEVICE OWS."

�There is a still caption on the back which reads: "OUTBOARD SIDE OF AIRLOCK TEST
SPECIMEN DURING TESTING WITH OUTBOARD VALVE IN CLOSED POSITION OWS."

�There is a still caption on the back which reads: "OUTBOARD SIDE OF AIRLOCK TEST
SPECIMEN DURING TESTING WITH OUTBOARD VALVE IN OPEN POSITION OWS."

�There is a still caption on the back which reads: "TRASH BAG BEING EJECTED THROUGH
AIRLOCK."

�There is a still caption on the back which reads: "DAC 35161"

�There is a still caption on the back which reads: "ASTRONAUT CONRAD CLOSING TRASH
DISPOSAL AIRLOCK. OWS NO-1."

�There is a still caption on the back which reads: "DAC 35159"

�There is a still caption on the back which reads: "DAC 35160"

�There is a still caption on the back which reads: "ASTRONAUT CONRAD OPENING TRASH
DISPOSAL AIRLOCK. OWS NO-1."

�There is a still caption on the back which reads: "DAC 37190"

�There is a still caption on the back which reads: "DAC 35148"

�There is a still caption on the back which reads: "DAC 35152"

�There is a still caption on the back which reads: "DAC 37192"

�There is a still caption on the back which reads: "DAC 38191"

�There is a still caption on the back which reads: "DAC 37099"

�There is a still caption on the back which reads: "DAC 37107"

�There is a still caption on the back which reads: "DAC 37188"

�There is a still caption on the back which reads: "DAC 37100"

�There is a still caption on the back which reads: "DAC 35172"

�There is a still caption on the back which reads: "DAC 35147 1-31-72"

�There is a still caption on the back which reads: "DAC 37696"

�There is a still caption on the back which reads: "DAC 38103"

�There is a still caption on the back which reads: "DAC 38101"

�There is a still caption on the back which reads: "DAC 38102"

�There is black ink writing on the back which reads: "37115", There is printed blue text on the back which reads"McDonnell
Douglas Astronautics Company Huntington Beach, California Photographic services Print No. DAC"

�There is a still caption on the back which reads: "DAC 37841"

�There is a still caption on the back which reads: "DAC 37222"

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                  <text>https://libguides.uah.edu/ld.php?content_id=10578214&lt;br /&gt;&lt;br /&gt;&lt;a href="http://libarchstor.uah.edu:8081/repositories/2/resources/80"&gt;View the Skylab Collection finding aid on ArchivesSpace&lt;/a&gt;</text>
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                  <text>Skylab was the first space station operated by NASA; it was launched without a crew on May 14, 1973. Skylab had three manned missions: Skylab 2, launched May 25, 1973, lasting 28 days, Skylab 3, launched July 28, 1973, lasting 60 days, and Skylab 4, launched November 16, 1973, lasting 84 days. Crews on Skylab conducted a variety of experiments during their missions, including experiments in human physiology, circadian rhythms, solar physics and astronomy, and material sciences. Important earth resources studies were conducting including studies on geology, hurricanes, and land and vegetation patterns.&#13;
&#13;
Two of the more important components for conducting research on Skylab were the Apollo Telescope Mount (ATM) and the Earth Resources Experiment Package (EREP). The ATM was a multi-spectral solar observatory, and NASA’s first full-scale manned astronomical observatory in space. The ATM yielded a significant number of images and provided useful data for understanding our sun. The EREP provided thousands of images of the Earth’s surface in visible, infrared, and microwave spectral regions.&#13;
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&#13;
https://en.wikipedia.org/wiki/Skylab#Manned_missions&#13;
&#13;
https://www.nasa.gov/missions/shuttle/f_skylab1.html&#13;
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https://history.nasa.gov/SP-402/ch4.htm</text>
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                <text>Conrad, Charles, Jr.</text>
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