STS-125

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Mission emblem
Mission emblem STS-125
Mission dates
Mission: STS-125
COSPAR-ID : 2009-025A
Crew: 7th
Begin: May 11, 2009 18:01:56 UTC
Starting place: Kennedy Space Center , LC-39A
Number of EVA : 5
Duration EVA: 36h 56min
Landing: May 24, 2009 3:39:05 PM UTC
Landing place: Edwards Air Force Base
Flight duration: 12d 21h 37min 9s
Earth orbits: 197
Track height: 570 km
Orbit inclination : 28.5 °
Covered track: 8.5 million km
Payload: 2 batteries,
3 Rate Sensor Units,
Cosmic Origins Spectrograph (COS),
Fine Guidance Sensor (FGS),
Science Instrument Command & Data Handling Unit (SIC & DH),
Soft Capture Mechanism (SCM),
Wide Field Camera 3 (WFC-3 )
Team photo
v. l. No. Michael Massimino, Michael Good, Gregory C. Johnson, Scott Altman, Megan McArthur, John Grunsfeld, Andrew Feustel
v. l. No. Michael Massimino, Michael Good, Gregory C. Johnson, Scott Altman, Megan McArthur, John Grunsfeld, Andrew Feustel
◄ Before / After ►
STS-119 STS-127

STS-125 ( english S pace T ransportation S ystem) was the mission designation for a flight of the US Space Shuttle Atlantis (OV-104) of NASA . It was the 126th space shuttle mission and the 30th flight of the space shuttle Atlantis. The launch took place on May 11, 2009 at 18:01:56 UTC .

STS-125 was the fifth maintenance flight to the Hubble space telescope . It was the only space shuttle flight since the Columbia disaster that did not go to the International Space Station (ISS).

During the maintenance mission SM4 (Service Mission 4), all three rate sensor units, each with two gyroscopes (devices for controlling the position of the telescope) and the two batteries were replaced as part of five space exits. In addition, a new sensor was installed to precisely align the telescope with celestial objects. A new camera and a new spectrometer were installed on improved research equipment. Due to the success of this repair flight, the operation of the Hubble telescope was considered secure until at least 2014.

team

Payloads

Various modules were located in the Atlantis' payload bay to be installed in the Hubble. These were:

  • Two rechargeable battery modules in which the electrical energy generated by the solar cells is stored, which is necessary to operate the telescope. They replace the original batteries, worn out and out of date after 19 years of use.
  • The Cosmic Origins Spectrograph (COS), a spectrograph that divides incident light into its wavelengths and thus determines quantitative data about the observed object. The device works in the range of ultraviolet light and complements the competencies of the Space Telescope Imaging Spectrograph (STIS), which should be repaired during this mission. The COS was installed in place of the Corrective Optics Space Telescope Axial Replacement Unit (COSTAR), which has corrected the error in the main mirror for Hubble's axial devices since the first maintenance mission. Since all modules added later have since been designed with a built-in correction, COSTAR was no longer needed and returned to Earth.
Wide field camera 3
  • A Fine Guidance Sensor (FGS), which is used together with the two position sensors on board to align the telescope and to determine the position of stars.
  • Several New Outer Blanket Layers (NOBL), insulating mats, which are supposed to stabilize the temperature of the telescope. They were attached to places on the telescope where the outermost insulating layer had already partially peeled off.
  • Three Rate Sensor Units (RSU), which each contain two gyroscopes and ensure the precise alignment of the telescope. With half of the Hubble gyroscopes inoperable, all three RSUs were replaced.
  • A Science Instrument Command and Data Handling Unit (SIC & DH), which is responsible for coding or decoding the data for transfer or execution. It replaced an identical model that had been defective since October 2008.
  • A Soft Capture Mechanism (SCM), a coupling mechanism that an unmanned spacecraft can later attach to, causing the Hubble to crash and thus burn up.
  • The Wide Field Camera 3 (WFC-3), a camera that takes pictures in the near-infrared, visible and intensified in the ultraviolet light spectrum. It should complement the competencies of the Advanced Camera for Surveys (ACS) to be repaired and replace the Wide Field Planetary Camera 2 (WFPC-2), which has been active since the first maintenance mission. The new model has a higher resolution and covers a larger viewing angle than its predecessor.

In addition, the usual container for maintenance missions with spare parts was installed in the payload bay. In addition, an IMAX-3D camera was installed in the loading bay , which recorded recordings of the maintenance mission and of the earth for later documentation under the name "Hubble 3D".

particularities

STS-125 is unique in the history of the shuttle program due to several special factors. Regardless of the payload, it differs in several ways from both recent missions to the International Space Station and previous missions in the orbit of the telescope.

STS-400

After the Columbia disaster , plans were developed to rescue a crew whose shuttle was no longer capable of reentry. A profile called Contingency Shuttle Crew Support (CSCS) with the general mission designation STS-3xx was developed, in which the crew is evacuated to the International Space Station and there waits for a rescue shuttle. However, this profile assumes that the orbit of the International Space Station, which has an inclination of 51.6 °, is the flight target of the mission to be rescued. This prerequisite is not given for a Hubble maintenance mission with a track inclination of 28.5 ° and cannot be achieved afterwards through track maneuvers. Accordingly, NASA dropped further Hubble flights for the time being. However, after scientists put pressure on NASA to return to Hubble, the search for an ISS-independent alternative began. A plan was developed based on several space exits in a rapidly launched rescue shuttle, which was added as STS-400 to the mission rules for STS-125. STS-125 is the only mission for which a special rescue plan has been developed. The Endeavor would have taken on the role of the rescue shuttle .

TAL cancellation options

STS-125 was the first shuttle mission ever that had to make do with only one emergency landing site on the east side of the Atlantic in the event of a TAL aborted take- off. This was the Morón military airfield in Spain , which was also used in earlier Hubble missions. Accordingly, Morón played an important role in the take-off rules, since a shuttle was generally only allowed to take off if at least one TAL landing site had good weather for an emergency landing.

During previous Hubble missions, the Banjul International Airport in Gambia and the Ben Guerir Air Base in Morocco were used as additional TAL emergency landing sites, but these were deactivated as such. Nevertheless, the cancellation time for Banjul was announced during the start.

Preparations

Damage to the starting system

The launch pad suffered severe damage during the launch of the STS-124 mission . As with several other launches, concrete slabs covering the launch system were pushed out. What was unusual, however, was that several fireclay bricks in a fire shaft of the launch system were destroyed on take-off and, as a rain of debris, destroyed a separating fence. During the preparation phase for the STS-125, tests were carried out to help determine what exactly had triggered the incident. The necessary repairs were also made. For this purpose, the remains of the fireclay bricks were removed from the wall and replaced with new ones. The application of a heat protection agent was ended on August 1, 2008, and the launch facility was released again five days later.

Preparing the orbiter

After the end of its last mission, STS-122 , the Atlantis was wheeled to the Orbiter Processing Facility (OPF) where the follow-up examination took place. At the same time, the coupling adapter was also removed as it was not needed on this mission.

On July 15th, the external tank was delivered, which was mounted between the Solid Rocket Booster after an investigation on August 3rd . A few days after delivery, three of the four freight containers were delivered. The new components to be installed during the mission were stored in them. The last container reached the Kennedy Space Center in early August.

Atlantis (front) and Endeavor on the launch systems.

Due to the tropical storm Fay , the transfer of the Atlantis to the Vehicle Assembly Building (VAB) was delayed by several days and finally took place on August 23 (UTC). There it was attached to the external tank and, after delays caused by a small defect at a connection point of the tank and the Stage 1 Hurricane Hanna, rolled to launch pad 39-A on September 4th. Due to various problems with the payload, in which, among other things, bacterial contamination was found which had to be cleaned up, the payload container with the freight was only driven to the launch site on September 21 and pulled into the rotating service structure. Its contents were assembled in the payload bay on September 26th.

On September 21, the crew arrived at the Kennedy Space Center for the Terminal Countdown Demonstration Test (TCDT) to take part in on-site rescue equipment training and to inspect the hardware for the flight. After a launch simulation, the crew flew back to the Johnson Space Center for further training on September 22nd .

Plan changes

On September 29, 2008, NASA announced that the Hubble Space Telescope's primary Science Instrument Command and Data Handler (SIC & DH), a hardware component responsible for caching and sending scientific data back to Earth, had failed. Since the failure of this unit could not be corrected, NASA scientists tried successfully to start up the backup system, which had not been used since the test phases in the late 1980s, so it was uncertain whether this component was still correct would work. As a result of this failure, the installation of a replacement module was included in the flight plan. However, since such a module was not available before April 2009 and the crew needed preparation time, STS-125 was postponed and the launch of STS-126 was brought forward. The Atlantis was unloaded from October 13th and rolled back from the launch system 39A to the VAB on October 20th to make room for the Endeavor, which from the launch system 39B, where it was available as a rescue shuttle for the Atlantis, on October 25th was rolled there. Discovery was to take over the task of the rescue shuttle from now on.

In order to maintain the planning for both the shuttle program and the Constellation program , the Atlantis was dismantled from its external tank on November 11, 2008 and returned to the Orbiter Processing Facility for general maintenance (Orbiter Major Down Period) . The external tank and its boosters were used by the Discovery during the STS-119 mission.

The second setup

At the beginning of January 2009, the assembly of the SRBs for the second structure began. The external tank was also installed a month later. The Atlantis left her OPF again for VAB on March 23 and was mounted on the external tank the following day. During this operation, a piece of hardware fell down and damaged the heat shield. The damage was then assessed and it was decided to repair the damage in the VAB. The Atlantis returned to launch facility 39A on March 31.

The spare part for the SIC & DH, which has meanwhile been found to be operational, was transferred to the KSC on March 29th. The crew flew to the Kennedy Space Center on April 1 to re-familiarize themselves with the equipment. On April 18, the payload was transported to the launch facility and assembled in the payload bay in the following days. During this work, one of the radiators in the payload bay was damaged, but this damage was repaired on site. Since there were no further problems, May 11, 18:01 UTC was specified as the first launch date during the flight readiness review carried out on April 30th .

Mission history

Start, rendezvous and capture

The Atlantis takes off towards Hubble.

The following days served the last activities to prepare for the start, which do not fall within the scope of the countdown . This included charging the new Hubble battery modules and other final work in the payload bay. Finally, the launch team assembled in the control center at 19:30 UTC so that the countdown could begin half an hour later. The crew arrived at the Shuttle Landing Facility at 21:00 UTC and went to the crew quarters of the Operations and Checkout Building. On the same day the gates of the payload bay were closed. Over the next two days, the space shuttle continued to be loaded and refueled. After a countdown without any problems, apart from a small ice formation on the outer tank, the Atlantis took off at 18:01:56 UTC. The Solid Rocket Boosters burned out as planned after a two-minute flight and were disconnected. The main engines were deactivated after eight and a half minutes of use and the external tank was thrown off shortly afterwards.

During the ascent, a sensor on one of the engines showed incorrect values. The Houston control center instructed the crew to ignore these as they did not affect engine efficiency. In the event of a loss of communication during the start phase, the crew could have used these values ​​as an indicator for a termination. A 2 square meter area and some gas lines for nitrogen and compressed air were damaged on the flame discharge duct of the starting system. The schedule for Endeavor was not jeopardized by the necessary repairs.

40 minutes after take-off, the first engine ignition, the OMS- 2 burn, was carried out, which increased and stabilized the orbit of the space shuttle. An hour later the cargo bay doors were opened. Some time later, the shuttle's robotic arm and some components in the Atlantis' payload bay were activated. After a short movement test, the cameras on the robot arm were used to examine the condition of the payload bay, the crew cabin and the front wing edges for the first time. The images obtained in this way replaced the recordings of the rendezvous pitch maneuver usually carried out on ISS flights .

The damage to the base of the wing of the Atlantis.

On the second day of flight (May 12), as has been customary since STS-114 , the heat shield was examined with the Orbiter Boom Sensor System (OBSS). However, this investigation was expanded for this flight and focused not only on the leading wing edges and the nose of the space shuttle, but also on the lower heat shield and the engine section. This was also done to compensate for the lack of the rendezvous pitch maneuver. During the investigation, slight surface damage was found at the base of the wing in a 50 cm long area, which was probably caused by a falling part that was recognizable in the start video 106 seconds after the start.

Inside the Space Shuttle Preparations were meanwhile for spacewalks taken. The spacesuits were unpacked and prepared for their first missions by charging the batteries and filling the oxygen bottles of the life support system. Furthermore, the air pressure inside the shuttle was reduced from normal pressure (1013  hPa ) to 703 hPa, so that the amount of inert gases (mainly nitrogen) dissolved in the body tissue of the space travelers decreased accordingly. This prevented decompression sickness during spacecraft missions and made it possible to avoid long pre-breathing of oxygen. Furthermore, the working platform, on which Hubble was to be mounted, was folded from the start to the working position.

The OMS engines for NC ignitions were activated a total of three times. These engine firings changed the orbit of Atlantis and put it on an interception course with Hubble. Hubble himself closed the main mirror's protective flap in preparation for the arrival of Atlantis. During the night from the second to the third day of flight, the telescope's transmission antennas were also folded in.

The robotic arm pulls Hubble into the payload bay.

The rendezvous took place on the third day of the flight (May 13th). Early in the day of the flight, two engine ignitions took place, another NC ignition and the NH ignition, which was strong in comparison, and brought the Atlantis 15.24 km from Hubble. There, the last major engine ignition, the TI-Burn, took place, which initiated the first phase of the rendezvous. After two minor course corrections, the space shuttle reached a position a few hundred meters below Hubble. From then on, Scott Altman took over manual control of the Atlantis and flew it close to the telescope. He then flew a nodding maneuver so that Megan McArthur could grab the telescope with the robotic arm. She then moved the arm so that the Hubble could be attached to the work platform and connected to the shuttle's power supply. The rest of the day the crew spent with the photographic documentation of Hubble's appearance and preparations for the first exit, when the WFPC-2 and the SIC & DH were to be exchanged.

Working on Hubble

Andrew Feustel at the end of the robotic arm.

Flight day four (May 14th) began with the final preparations for the disembarkation. John Grunsfeld and Andrew Feustel put on their spacesuits and went into the airlock. There they breathed in oxygen for around 45 minutes to further reduce the inert gases before the decompression of the airlock was initiated. They started the exit by switching the suits to internal power supply at 12:52 UTC. You first performed some preparatory tasks. This included, among other things, attaching a small foot bracket to the end of the robot arm so that Feustel could mount it. Megan McArthur was able to use the robotic arm to give Feustel access to the workplaces. While Feustel was being moved to the position of the WFPC-2, Grunsfeld worked in the payload bay and opened the locks on the camera container. He also installed a bracket in which removed devices could be temporarily stored.

Andrew Feustel began work on WFPC-2 by attaching a handle to it. During the removal, however, some problems arose with a screw that prevented the device from being removed immediately. After this problem was resolved, Feustel pulled the camera out of the telescope and attached it to the temporary mount. The robotic arm then maneuvered him so that he could remove the WFC-3 from its container and insert it into Hubble. While the WFPC-2 was pushed into its successor's container, the WFC-3 passed an initial test that only checked whether the device was active. It passed the function test a few hours later, in which the basic data sent by the camera were evaluated.

The next task was to swap out the SIC & DH unit. Feustel was brought to the door on which the faulty unit was mounted. While he loosened the locking bolt and dismantled the unit, Grunsfeld released the new SIC & DH from its starting position and brought it to Feustel. With him, they exchanged the units and installed the devices they received in the same positions where they had previously removed the others. The new SIC & DH also successfully completed its initial test and the subsequent functional test.

Since Grunsfeld finished this task quickly, he installed the soft capture mechanism on Hubble. Since there was still some time left, he got some “lock-over-center-kits” (Lock), which were installed on one of Hubble's doors in preparation for the third exit. They allowed the door to be opened faster. During the installation, which Feustel carried out again, difficulties arose with a bolt, which is why only two of the three planned locks were installed. The assembly of the third lock was started, but later canceled and a different mechanism similar to the lock was installed. After this work, the duo went back into the airlock and completed the exit at 16:12 UTC after seven hours and 20 minutes. The rest of the day was used to prepare for the next exit, the aim of which was to replace the RSUs and the first battery.

Massimino (left) and Good at the beginning of the second exit.

The first action on the fifth day of flight (May 15) involved the inspection of a relatively small area of ​​the lower heat shield. This point was not recorded during flight day two and was only made up for the sake of completeness, with only the cameras on the robot arm being used. During this 45-minute action, Michael Massimino and Michael Good prepared for their exit. They switched their spacesuits to internal at 12:49 UTC and exited the airlock. While Good attached himself to the robot arm, Massimino opened the container that contained the RSUs. He also installed a tool for getting out. Massimino then went to Hubble's place of work, opened it, and prepared it for work. Meanwhile, Good took the first unit out of the container and allowed it to be carried to the telescope. There he removed the old unit and installed the new one without any problems. He flew back, stowed the old unit, and removed another. However, this unit turned out to be faulty and was therefore unusable in Hubble, which is why it was stowed away again and replaced by a reserve unit. The last unit could be reinstalled without any problems. All three new RSUs passed the initial and later the functional test.

Despite the advanced time, the decision was made to replace the first battery module as well. So Good was maneuvered to the new working position, where he opened the door and detached the battery module from the inside of the door. After disconnecting the electronic connections, he flew to Massimino and swapped the old module for the new one. He then mounted the battery and connected it. She also passed both tests. After a minor additional task in preparation for the next exit, "the Mikes" went back into the airlock, which was pressurized again at 20:45 UTC. With seven hours and 56 minutes, they reached eighth place on the list of the longest spacecraft missions . Preparations for the next exit, where the COS would be installed and the ACS repaired, ended the day of the astronauts.

Feustel removes COSTAR.

Against all expectations, the third exit, the second by the duo Grunsfeld / Feustel, went better than originally expected. After they began their exit on the sixth day of flight (May 16) at 13:35 UTC, both worked on exchanging COSTAR for the Cosmic Origins Spectograph. This work was similar to the exchange of the WFPC-2 for WFC-3 and could be carried out without any problems. COS passed the initial and functional tests.

The astronauts then began work on the Advanced Camera for Surveys, which was the first instrument to ever be repaired during an outboard mission. John Grunsfeld, who carried out all work on ACS, had to remove part of the outer casing of the device, which was only possible by cutting it out. He attached a device to the housing, which cut a hole in the cladding and retained the remaining materials so that they no longer posed a danger to the space travelers. Then Grunsfeld attached a tool to the cover plate of the actual working position. This tool enabled him to remove 32 screws that would otherwise not have been captured. Grunsfeld then used a special hand tool and removed the four plug-in cards from the camera's electronic system. These cards had a short circuit in January 2007 and have been inoperable since then. There were no problems removing the cards, so Grunsfeld was an hour ahead of schedule at the end of this task. So the duo was given permission to begin the second part of the ACS work. This work was not intended for this exit and was only optional in the flight plan for the entire mission planning after the SIC & DH failure. So Grunsfeld put a box in the slot that contains the same components that were on the cards. He also provided the power supply that is necessary for using the box. They then completed the ACS work and started leaving the workplace. The Advanced Camera for Surveys has so far passed the initial test. The exit, which was extended as planned from 6.5 to 7.66 hours due to the additional work, ended after just 6 hours and 36 minutes at 20:11 UTC.

Although ACS passed the initial test, the function test showed that the high-resolution channel of the device was not responding. It had been expected that the repair would not reactivate this channel, although hopes had persisted.

Michael Massimino during the fourth exit.

Disembarkation four of the mission began on the seventh day of flight (May 17) at 13:45 UTC. During their second exit, the duo Massimino / Good was supposed to reactivate the Space Telescope Imaging Spectograph (STIS) with a repair. To do this, you had to remove some clamps on the housing and a bracket from the cover plate. However, it was not possible to remove a bolt from the handrail, so Massimino had to break it out. He then installed a tool on the cover plate that caught the total of 111 screws that had to be removed to gain access to the interior of the device. Afterwards, the electronic card was removed from STIS and replaced with a new one. Due to the very advanced time, the planned installation of a NOBL insulation mat was no longer carried out and the exit was ended at 21:47 UTC. At eight hours and two minutes, this exit ranks sixth on the list of the longest spacecraft missions.

STIS passed the initial test, but switched to a safety mode during the function test because the temperature of the device had dropped too much. A new function test should be carried out as soon as the temperature has stabilized.

After the end of the exit, Hubble was rotated 180 °, revealing the previously unseen rear of the telescope. It was found that the insulation at the point that should originally have been replaced in the fourth exit was badly damaged. It was decided to perform this task during the fifth exit.

Grunsfeld and Feustel close Hubble's doors for the last time.

The last disembarkation of the mission took place on the eighth day of the flight (May 18). Grunsfeld and Feustel left the crew cabin for the third time at 12:20 UTC and worked on replacing the second battery module. The work required for this coincided with that on its counterpart and could be carried out without any problems. The battery passed the initial test. The astronauts then began to remove one of the three Fine Guidance sensors from its holder so that a new one could be installed in its position. The work was comparable to replacing the WFPC-2 and was completed without any problems.

Since these tasks were completed in less than three hours, permission was given to install the three NOBLs. Before installing the new insulation, however, the old mats had to be removed. To do this, the restraints and ties on the mats had to be loosened and partly cut. While this worked fine with the first of the three mats, the second made more trouble. After this mat was replaced, the third mat could be continued. Then Grunsfeld and Feustel configured the robot arm and the payload bay for the journey home. There was a small accident with the telescope: John Grunsfeld was preparing the working platform for folding up the next day of flight when he accidentally collided with the transmission antenna of the telescope for low frequencies and damaged it. It still worked afterwards, but it was decided at short notice to repair the damage immediately. Grunsfeld and Feustel completed the mission's last exit after seven hours and two minutes at 19:22 UTC. With a total of 36 hours and 56 minutes of spacecraft during this mission, the longest time in a single mission, the Hubble service program ended after 23 disembarkations with a total duration of 166 hours and six minutes. John Grunsfeld, who took part in a total of nine of these exits, achieved third place in the list of astronauts with the greatest outboard experience with 58 hours and 30 minutes. It was also the last time that an exit was completed as planned via the shuttle's airlock.

Shortly after the exit, the transmission antennas were folded out again for high transmission rates. Furthermore, Hubble was turned back to the starting position.

return

Hubble after the maintenance mission

On flight day nine (May 19), Hubble was disconnected from the shuttle. Megan McArthur grabbed Hubble with the robotic arm, removed it from the maintenance platform and lifted it out of the payload bay. After the protective bulkhead of the mirror had been opened, the telescope was released at 12:57 UTC. The Atlantis was then slowly moved away from the telescope until it was far enough away to activate its engine and move further away. The crew then began the late inspection of the heat shield and the folding in of the maintenance platform in preparation for landing. An engine ignition lowered the perigee of the orbit to 300 km in order to reduce the risk of micrometeorites and space debris.

The tenth day of the flight (May 20) was free for the crew members. They gave the traditional press conference and had the opportunity to speak to the crew of the International Space Station. In addition, the first preparations for the landing were in progress. On the eleventh day of the flight (May 21), these activities continued and the flight control systems for the landing were checked.

The Atlantis lands.

The landing of Atlantis was scheduled for the twelfth day of flight (May 22nd) at the Kennedy Space Center, but the two landing options were discarded due to bad weather. Edwards Air Force Base was also activated for Flight Day 13 (May 23) . There were a total of six landing options via three orbits (three at KSC and three on EAFB), all of which, however, were discarded.

Flight day 14 (May 24) was the penultimate planned mission day, which is why a landing had to take place without any technical obstacles. It was initially worked towards the first possibility of landing at the Kennedy Space Center, but this was discarded because of the unsafe weather. In the next orbit, 20 minutes before the deorbit burn, due to the unstable weather at KSC, it was decided to land on Edwards AFB for the second time and ignited the engines at 14:24 UTC. 75 minutes later, the ferry touched down on runway 22. The astronauts left the space shuttle about an hour later and examined it before being taken to their quarters.

Transfer to Florida

After landing, the Atlantis was pulled to the Mate-Demate-Device, where it was lifted in preparation for assembly on the Shuttle Carrier Aircraft . An engine cover was also installed there in order to improve the aerodynamic conditions. On June 1 at 15:03 UTC, the aircraft took off for the first section to Biggs Army Airfield near El Paso , where the network stayed overnight. The next day it continued at 12:41 UTC. Further refueling stops were made at Lackland AFB in San Antonio and Columbus AFB in Columbus before landing at the NASA Shuttle Landing Facility at 22:53 UTC. The Atlantis was detached from the aircraft in the next few days and transferred to the Orbiter Processing Facility in preparation for its next STS-129 mission .

See also

Web links

Commons : STS-125  - Album with pictures, videos and audio files

swell

Individual evidence

  1. ↑ Live at KSC: Atlantis launch damaged pad 39A. In: Florida Today. May 12, 2009, archived from the original on May 15, 2009 ; accessed on May 13, 2009 .
  2. ↑ STATUS REPORT: STS-125-01. In: STS-125 MCC Status Report. NASA, May 11, 2009, accessed May 12, 2009 .
  3. ↑ STATUS REPORT: STS-125-03. In: STS-125 MCC Status Report. NASA, May 12, 2009, accessed May 13, 2009 .
  4. ↑ STATUS REPORT: STS-125-05. In: STS-125 MCC Status Report. NASA, May 13, 2009, accessed May 14, 2009 .
  5. ↑ STATUS REPORT: STS-125-07. In: STS-125 MCC Status Report. NASA, May 14, 2009, accessed May 15, 2009 .
  6. ↑ STATUS REPORT: STS-125-09. In: STS-125 MCC Status Report. NASA, May 15, 2009, accessed May 16, 2009 .
  7. ↑ STATUS REPORT: STS-125-11. In: STS-125 MCC Status Report. NASA, May 16, 2009, accessed May 17, 2009 .
  8. ↑ STATUS REPORT: STS-125-13. In: STS-125 MCC Status Report. NASA, May 17, 2009, accessed May 18, 2009 .
  9. ↑ STATUS REPORT: STS-125-15. In: STS-125 MCC Status Report. NASA, May 18, 2009, accessed May 19, 2009 .
  10. ↑ STATUS REPORT: STS-125-17. In: STS-125 MCC Status Report. NASA, May 19, 2009, accessed May 20, 2009 .
  11. ↑ STATUS REPORT: STS-125-19. In: STS-125 MCC Status Report. NASA, May 20, 2009, accessed May 21, 2009 .
  12. ↑ STATUS REPORT: STS-125-21. In: STS-125 MCC Status Report. NASA, May 21, 2009, accessed May 22, 2009 .
  13. ↑ STATUS REPORT: STS-125-23. In: STS-125 MCC Status Report. NASA, May 22, 2009, accessed May 23, 2009 .
  14. ↑ STATUS REPORT: STS-125-25. In: STS-125 MCC Status Report. NASA, May 23, 2009, accessed May 24, 2009 .
  15. ↑ STATUS REPORT: STS-125-27. In: STS-125 MCC Status Report. NASA, May 24, 2009, accessed May 24, 2009 .
This version was added to the list of articles worth reading on August 13, 2009 .