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Astronauts make 100th station spacewalk


Dan Tani (top) and Peggy Whitson (bottom) spacewalk outside the International Space Station on Dec. 18, 2007.  (NASA TV)
December 18, 2007 — Two astronauts stepped outside the International Space Station this morning, making the 100th spacewalk dedicated to the ongoing assembly of the orbiting outpost. The 6 hour, 56 minute extravehicular activity (EVA) performed by astronauts Peggy Whitson and Dan Tani came nine years and 11 days after the first station spacewalk in December 1998.

Today's excursion was devoted to inspecting two devices related to the station's power generating solar arrays, both of which have malfunctioned. Tani and Whitson were sent on the "fact-finding mission" to the solar alpha rotary joint (SARJ) and beta gimbal assembly (BGA) on the station's starboard-side in an attempt to diagnose what has caused the earlier to shed metal filings and the latter to trip circuit breakers.

The decision by mission managers to have Whitson and Tani conduct the EVA came after space shuttle Atlantis was delayed from launching earlier this month by a faulty low level fuel sensor system. NASA engineers began a tanking test at Kennedy Space Center while Whitson and Tani were outside in order to clear Atlantis for a January liftoff.

As the spacewalk was quickly scheduled, the Expedition 16 astronauts were surprised to learn it was the 100th in station history when collectSPACE.com spoke with them last week.

"That's actually news to us about the 100th EVA," said Tani in response to a question from collectSPACE.com. "It is kind of mind boggling. I remember pre-ISS talking about the hundreds — or more than one hundred — EVAs that are going to be required for assembly and thinking that was a huge mountain to climb."

"We're proud to be part of those hundred EVAs. It's very nice to know that we're going to make that 100 mark," he concluded.

In addition to making the 100th spacewalk, Whitson also set a record today for female total EVA time, surpassing Sunita Williams who had set the bar at 29 hours and 17 minutes last February. Whitson became the first woman to command the ISS when she arrived at the station three months ago.

Including today's pair of spacewalkers, 73 astronauts and cosmonauts have worked on the ISS's exterior, including three representatives from the European Space Agency (France, Germany and Sweden), three from the Canadian Space Agency and an astronaut from Japan's Aerospace Exploration Agency.

More than 624 hours — over 26 days — were logged by those 73 explorers while performing spacewalks. Almost a third of the EVAs began out the space shuttle's airlock; the remaining exited from the station, either from the US Quest or Russian Pirs airlocks. Two-thirds of the EVAs took place while a shuttle was docked at the station; the others, like today's, during the stages between missions.

The first ISS spacewalk was made on December 7, 1998, on the same flight that saw the docking of the first two station modules. STS-88 mission specialists Jerry Ross and Jim Newman completed the 7 hour, 21 minute EVA outside of Endeavour, connecting umbilicals on the Unity node.

The longest duration station EVA was performed by Jim Voss and Susan Helms during the 17th ISS spacewalk on March 11, 2001. For 8 hours and 56 minutes, the two astronauts worked to configure a docking port to receive a resupply module. The briefest EVA came three years later, after a loss of pressure in Mike Finke's oxygen tank cut short the 53rd spacewalk to just 13 minutes.

The 100th station spacewalk was also the 289th in space history. The 100th American and Russian EVAs also took place outside the ISS: the U.S. in February 2001 on the 15th ISS spacewalk; Russia, just 8 months later, on the 27th ISS EVA.

"That's an amazing record of resounding success," Tani radioed as he made his way back inside near the end of today's spacewalk. "A hundred space EVAs is fantastic and even though we lose a piece of tape here and there, I think we've done incredible work and I know we couldn't have built the space station without it."

"Of course we want to thank everyone involved in this EVA," Tani continued, "but also everybody who has worked on all hundred EVAs. Everybody who makes the suits, the gloves and the procedures and the tools... we thank them all. It's fantastic and fortunate to be the people out here doing the spacewalk but we know that all the hard work happens on the ground."

"Oh! Thank you to whoever makes Kapton tape, too!" he was quick to add.

No. Spacewalkers Date/Duration Tasks
1. J. Ross
J. Newman
Dec 7, 1998
7 hr, 21 min
Connect Unity node cables.
2. J. Ross
J. Newman
Dec 9, 1998
7 hr, 2 min
Install Unity antennas.
3. J. Ross
J. Newman
Dec 12, 1998
6 hr, 59 min
Install Unity EVA equipment.
4. T. Jernigan
D. Barry
May 30, 1999
7 hr, 55 min
Install cranes.
5. J.S. Voss
J. Williams
May 22, 2000
6 hr, 44 min
Crane repair.
6. E. Lu
Y. Malenchenko
Sep 11, 2000
6 hr, 14 min
Install magnetometer and boom.
7. L. Chiao
W. McArthur
Oct 15, 2000
6 hr, 28 min
Connect cables and install antennas.
8. M. Lopez-Alegria
P. Wisoff
Oct 16, 2000
7 hr, 07 min
Install PMA-3 docking port
9. L. Chiao
W. McArthur
Oct 17, 2000
6 hr, 48 min
Install Z1 truss on Unity.
10. M. Lopez-Alegria
P. Wisoff
Oct 18, 2000
6 hr, 56 min
Install Z1 truss.
11. J. Tanner
C. Noriega
Dec 3, 2000
7 hr, 33 min
Install P6 solar array to Z1 truss.
12. J. Tanner
C. Noriega
Dec 5, 2000
6 hr, 37 min
Install P6 solar array.
13. J. Tanner
C. Noriega
Dec 7, 2000
5 hr, 10 min
Install electrical probes.
14. T. Jones
R. Curbeam
Feb 10, 2001
7 hr, 34 min
Install Destiny lab to Unity.
15. T. Jones
R. Curbeam
Feb 12, 2001
6 hr, 50 min
Install docking module to Destiny.
16. T. Jones
R. Curbeam
Feb 14, 2001
5 hr, 25 min
Install antenna, radiator release.
17. J.S. Voss
S. Helms
Mar 11, 2001
8 hr, 56 min
Prepare docking port for MPLM Leonardo.
18. A. Thomas
P. Richards
Mar 13, 2001
6 hr, 21 min
Install spare ammonia coolant pump.
19. C. Hadfield
S. Parazynski
Apr 22, 2001
7 hr, 10 min
Install UHF antenna and Canadarm2.
20. C. Hadfield
S. Parazynski
Apr 24, 2001
7 hr, 40 min
Inspect Canadarm2.
21. Y. Usachev
J.S. Voss
Jun 8, 2001
0 hr, 19 min
Transfer docking cone.
22. M. Gernhardt
J. Reilly
Jul 15, 2001
5 hr, 59 min
Install Quest Joint Airlock to Unity.
23. M. Gernhardt
J. Reilly
July 18, 2001
6 hr, 29 min
Install two gas tanks to Quest airlock.
24. M. Gernhardt
J. Reilly
Jul 21, 2001
4 hr, 02 min
Install two gas tanks to Quest airlock.
25. D. Barry
P. Forrester
Aug 16, 2001
6 hr, 16 min
Install ammonia servicer unit.
26. D. Barry
P. Forrester
Aug 18, 2001
5 hr, 29 min
Install handrails on Destiny.
27. V. Dezhurov
M. Tyurin
Oct 8, 2001
4 hr, 58 min
Install cables between Pirs and Zvezda.
28. V. Dezhurov
M. Tyurin
Oct 15, 2001
5 hr, 51 min
Install Russian commercial experiments.
29. V. Dezhurov
F. Culbertson
Nov 12, 2001
5 hr, 5 min
Install Kurs automated docking system cables.
30. V. Dezhurov
M. Tyurin
Dec 3, 2001
2 hr, 46 min
Progress docking ring repair.
31. L. Godwin
D. Tani
Dec 10, 2001
4 hr, 12 min
Install thermal insulating blankets.
32. Y. Onufrienko
C. Walz
Jan 14, 2002
6 hr, 3 min
Install ham radio antenna on Zvezda.
33. Y. Onufrienko
D. Bursch
Jan 25, 2002
5 hr, 59 min
Install ham radio antenna on Zvezda.
34. C. Walz
D. Bursch
Feb 20, 2002
5 hr, 47 min
Install cables, tighten tank clamps.
35. S. Smith
R. Walheim
Apr 11, 2002
7 hr, 48 min
Install S0 Truss on Destiny.
36. J. Ross
L. Morin
Apr 13, 2002
7 hr, 30 min
Install S0 Truss.
37. S. Smith
R. Walheim
Apr 14, 2002
6 hr, 27 min
Reconfigure Canadarm2 for S0 truss.
38. J. Ross
L. Morin
Apr 16, 2002
6 hr, 37 min
Install future EVA hardware.
39. F. Chang-Diaz
P. Perrin
Jun 9, 2002
7 hr, 14 min
Attach Power and Data Grapple Fixture to P6.
40. F. Chang-Diaz
P. Perrin
Jun 11, 2002
5 hr, 0 min
Attach Mobile Base System to Mobile Transporter.
41. F. Chang-Diaz
P. Perrin
Jun 13, 2002
7 hr, 17 min
Replace Canadarm2 wrist joint.
42. V. Korzun
P. Whitson
Aug 16, 2002
4 hr, 23 min
Install Strela boom on Pirs.
43. V. Korzun
S. Treschev
Aug 26, 2002
5 hr, 21 min
Install EVA hardware on Zarya.
44. D. Wolf
P. Sellers
Oct 10, 2002
7 hr, 1 min
Install lines between S0 and S1.
45. D. Wolf
P. Sellers
Oct 12, 2002
6 hr, 4 min
Install future EVA hardware.
46. D. Wolf
P. Sellers
Oct 14, 2002
6 hr, 36 min
Complete S1 install.
47. M. Lopez-Alegria
J. Herrington
Nov 26, 2002
6 hr, 45 min
Install P1 truss.
48. M. Lopez-Alegria
J. Herrington
Nov 28, 2002
6 hr, 10 min
Install TV cameras, move CETA.
49. M. Lopez-Alegria
J. Herrington
Nov 30, 2002
7 hr, 0 min
Inspect Mobile Transporter.
50. K. Bowersox
D. Pettit
Jan 15, 2003
6 hr, 51 min
Release P1 truss radiator system.
51. K. Bowersox
D. Pettit
Apr 8, 2003
6 hr, 26 min
Move cables between S0, S1 and P1.
52. M. Foale
A. Kaleri
Feb 26, 2004
3 hr, 55 min
Install and remove experiments.
53. G. Padalka
M. Fincke
Jun 24, 2004
0 hr, 13 min
Cut short due to loss of pressure in Fincke's oxygen tank.
54. G. Padalka
M. Fincke
Jun 30, 2004
5 hr, 40 min
Service ISS gyroscope.
55. G. Padalka
M. Fincke
Aug 3, 2004
4 hr, 30 min
Install antennas, replace laser reflectors.
56. G. Padalka
M. Fincke
Sep 3, 2004
5 hr, 20 min
Install ATV docking antennas.
57. L. Chiao
S. Sharipov
Jan 26, 2005
5 hr, 28 min
External outfitting of Zvezda.
58. L. Chiao
S. Sharipov
Mar 28, 2005
5 hr, 6 min
Prepare ISS for ATV, launch of a small Russian satellite.
59. S. Noguchi
S. Robinson
Jul 30, 2005
6 hr, 50 min
Repair CMG 2.
60. S. Noguchi
S. Robinson
Aug 1, 2005
6 hr, 30 min
Replace CMG 1.
61. S. Noguchi
S. Robinson
Aug 3, 2005
6 hr, 1 min
Install amateur radio satellite PCSAT2.
62. S. Krikalev
J. Phillips
Aug 18, 2005
4 hr, 58 min
Remove Russian materials experiments; install camera.
63. W. McArthur
V. Tokarev
Nov 7, 2005
5 hr, 22 min
Install P1 camera, Floating Potential Probe jettison, replace remote power controller module on MT.
64. W. McArthur
V. Tokarev
Feb 3, 2006
5 hr, 43 min
Release SuitSat-1, retrieve experiment, tie off MT umbilical.
65. P. Vinogradov
J. Williams
Jun 1, 2006
6 hr, 31 min
Repair vent for Elektron, replace camera, retrieve experiment.
66. P. Sellers
M. Fossum
Jul 8, 2006
7 hr, 32 min
Block MT cutter blade.
67. P. Sellers
M. Fossum
Jul 10, 2006
6 hr, 47 min
Restore MT rail car to operation, deliver spare pump module.
68. P. Sellers
M. Fossum
Jul 12, 2006
6 hr, 20 min
Test shuttle repair methods.
69. J. Williams
T. Reiter
Aug 3, 2006
5 hr, 54 min
Install thermal rotary joint motor controller, replace STR MDM.
70. J. Tanner
Stefanyshyn-Piper
Sep 12, 2006
5 hr, 26 min
Install P3/4 truss.
71. D. Burbank
S. MacLean
Sep 13, 2006
7 hr, 11 min
Install P3/4 truss.
72. J. Tanner
Stefanyshyn-Piper
Sep 15, 2006
6 hr, 42 min
Install radiator on P3/4.
73. M. Tyurin
M. Lopez-Alegria
Nov 22, 2006
5 hr, 38 min
Install BTN neutron experiment, relocate WAL antenna, inspect Kurs antenna, golf shot.
74. R. Curbeam
C. Fuglesang
Dec 12, 2006
6 hr, 36 min
Install P5, replace S1 camera.
75. R. Curbeam
C. Fuglesang
Dec 14, 2006
5 hr, 0 min
Rewire ISS electrical system, circuits 2/3.
76. R. Curbeam
S. Williams
Dec 16, 2006
7 hr, 31 min
Rewire ISS electrical system, circuits 1/4, retract solar array wing.
77. R. Curbeam
C. Fuglesang
Dec 18, 2006
6 hr, 38 min
Retract solar array wing.
78. M. Lopez-Alegria
S. Williams
Jan 31, 2007
7 hr, 55 min
Cooling loop reconfiguration.
79. M. Lopez-Alegria
S. Williams
Feb 4, 2007
7 hr, 11 min
Cooling loop reconfiguration, connect SSPTS cable; retract P6 starboard radiator; remove EAS connections.
80. M. Lopez-Alegria
S. Williams
Feb 8, 2007
6 hr, 40 min
Remove thermal shrouds, deploy UCCAS, remove P5 launch locks, connect SSPTS cable.
81. M. Tyurin
M. Lopez-Alegria
Feb 22, 2007
6 hr, 18 min
Retract Progress antenna; inspection and photography.
82. F. Yurchkhin
O. Kotov
May 30, 2007
5 hr, 25 min
Install SMDP panel, reroute GPS antenna cable.
83. F. Yurchkhin
O. Kotov
Jun 06, 2007
5 hr, 37 min
Install Zarya cable, SMDP panel, deploy experiment.
84. J. Reilly
D. Olivas
Jun 11, 2007
6 hr, 15 min
Install S3/S4 Truss.
85. P. Forrester
S. Swanson
Jun 13, 2007
7 hr, 16 min
Retract P6 solar array wings, install S3/S4 truss.
86. J. Reilly
D. Olivas
Jun 15, 2007
7 hr, 58 min
Retract P6 solar array wing, install Destiny hydrogen valve.
87. P. Forrester
S. Swanson
Jun 17, 2007
6 hr, 29 min
Install solar alpha rotary joint, camera stanchion and network cable, secure debris shield.
88. C. Anderson
F. Yurchkhin
Jul 23, 2007
7 hr, 41 min
Replace MT power component, jettison ammonia tank and camera stanchion.
89. R. Mastracchio
D. Williams
Aug 11, 2007
6 hr, 17 min
Install P5 truss, retract P6 radiator.
90. R. Mastracchio
D. Williams
Aug 13, 2007
6 hr, 28 min
Remove and replace CMG.
91. R. Mastracchio
C. Anderson
Aug 15, 2007
5 hr, 28 min
Install P1 XPDR, relocate P6 SASA, CETA cart, S-band antenna.
92. D. Williams
C. Anderson
Aug 18, 2007
5 hr, 2 min
Install OBSS stand, retrieve MISSE, install EWIS antenna, secure Z1 gimbal locks
93. S. Parazynski
D. Wheelock
Oct 26, 2007
6 hr, 14 min
Install Harmony Node 2, retrieve SASA, disconnect P6/Z1 fluid line.
94. S. Parazynski
D. Tani
Oct 28, 2007
6 hr, 33 min
Disconnect Z1 umbilical, detach P6, configure S1 radiator, install Node 2 handrails, inspect SARJ.
95. S. Parazynski
D. Wheelock
Oct 30, 2007
7 hr, 8 min
Relocate P6 to P5, connect P6/P5 umbilicals, inspect SARJ.
96. S. Parazynski
D. Wheelock
Nov 3, 2007
7 hr, 19 min
Inspect and repair P6 solar array.
97. P. Whitson
Y. Malenchenko
Nov 9, 2007
6 hr, 55 min
Disconnect SSPTS cable, stow PMA-2, Node 2 avionics umbilicals.
98. P. Whitson
D. Tani
Nov 20, 2007
7 hr, 16 min
Connect PMA-2/Harmony fluid, electrical, and data lines.
99. P. Whitson
D. Tani
Nov 24, 2007
7 hr, 4 min
Connect PMA-2/Harmony fluid, electrical, and data lines, inspect SARJ.
100. P. Whitson
D. Tani
Dec 18, 2007
6 hr, 56 min
Inspect starboard SARJ and BGA.

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