Skylab 2

First crewed mission to Skylab

This article is about the first crewed mission to Skylab. For the backup Skylab space station, see Skylab B. For the NASA L2 space station concept, see Skylab II. For other uses, see Skylab Two.

Skylab 2

Skylab, seen from the departing Skylab 2 spacecraft

Mission type| Crewed mission to Skylab
Operator| NASA
COSPAR ID| 1973-032A
SATCAT no.| 06655
Mission duration| 28 days, 49 minutes, 49 seconds
Distance travelled| 18,500,000 km (11,500,000 mi; 10,000,000 nmi)
Orbits completed| 404
Spacecraft properties
Spacecraft| Apollo CSM-116
Manufacturer| North American Rockwell
Launch mass| 19,979 kg (44,046 lb)
Crew
Crew size| 3
Members|

* Pete Conrad
* Joseph P. Kerwin
* Paul J. Weitz

EVAs| 3
EVA duration| 5 hours, 41 minutes
Start of mission
Launch date| 13:00:00, May 25, 1973 (UTC) (1973-05-25T13:00:00Z)
Rocket| Saturn IB SA-206
Launch site| Kennedy, LC-39B
End of mission
Recovered by| USS Ticonderoga
Landing date| 13:49:48, June 22, 1973 (UTC) (1973-06-22T13:49:48Z)
Landing site| 24°45′N 127°2′W﻿ / ﻿24.750°N 127.033°W﻿ / 24.750; -127.033
Orbital parameters
Reference system| Geocentric orbit
Regime| Low Earth orbit
Perigee altitude| 428 km (266 mi; 231 nmi)
Apogee altitude| 438 km (272 mi; 237 nmi)
Inclination| 50°
Period| 93.2 minutes
Epoch| June 4, 1973[1]
Docking with Skylab
Docking port| Forward
Docking date| May 26, 1973, 09:56 UTC
Undocking date| May 26, 1973, 10:45 UTC
Time docked| 49 minutes[2]
Docking with Skylab
Docking port| Forward
Docking date| May 26, 1973, 15:50 UTC[2]
Undocking date| June 22, 1973, 08:58 UTC[3]
Time docked| 26 days, 11 hours, 2 minutes

Mission patch. Due to a NASA management error, crewed Skylab mission patches were designed in conflict with the official mission numbering scheme.

From left: Kerwin, Conrad and Weitz

Skylab program

<- Skylab 1

Skylab 3 ->

Skylab 2 (also SL-2 and SLM-1[4]) was the first crewed mission to Skylab, the first American orbital space station. The mission was launched on an Apollo command and service module by a Saturn IB rocket on May 25, 1973,[5] and carried NASA astronauts Pete Conrad, Joseph P. Kerwin, Paul J. Weitz to the station. The name Skylab 2 also refers to the vehicle used for that mission. The Skylab 2 mission established a twenty-eight-day record for human spaceflight duration. Its crew was the first space station occupants ever to return safely to Earth – the only previous space station occupants, the crew of the 1971 Soyuz 11 mission that had crewed the Salyut 1 station for twenty-four days, died upon reentry due to unexpected cabin depressurization.

The crewed Skylab missions were officially designated Skylab 2, 3, and 4. Miscommunication about the numbering resulted in the mission emblems reading "Skylab I", "Skylab II", and "Skylab 3" respectively.[4][6]

## Crew

[edit]

Position | Astronaut

|

Commander  | Charles "Pete" Conrad, Jr.
Fourth and last spaceflight
Science Pilot  | Joseph P. Kerwin
Only spaceflight
Pilot  | Paul J. Weitz
First spaceflight
Kerwin became the first medical doctor in space. NASA chose a doctor as the first Skylab scientist to better understand the effect of spaceflight on the human body during a long-duration mission.[7]

### Backup crew

[edit]

Position | Astronaut

|

Commander  | Russell L. Schweickart
Science Pilot  | F. Story Musgrave
Pilot  | Bruce McCandless II

### Support crew

[edit]

* Robert L. Crippen
* Henry W. Hartsfield, Jr
* William E. Thornton
* Richard H. Truly

## Mission parameters

[edit]

* Mass: 19,979 kg
* Maximum altitude: 440 km
* Distance: 18,536,730.9 km
* Launch vehicle: Saturn IB SA-206
* Spacecraft: Apollo CSM-116
* Perigee: 428 km
* Apogee: 438 km
* Inclination: 50°
* Period: 93.2 min
* Soft dock: May 26, 1973 – 09:56 UTC
* Undocked: May 26, 1973 – 10:45 UTC
* Time docked: 49 minutes
* Hard dock: May 26, 1973 – 15:50 UTC
* Undocked: June 22, 1973 – 08:58 UTC
* Time docked: 26 days, 17 hours, 2 minutes

### Space walks

[edit]

Weitz — EVA 1 (stand up EVA — CM side hatch)
Start: May 26, 1973, 00:40 UTC
End: May 26, 01:20 UTC
Duration: 40 minutes
Conrad and Kerwin — EVA 2
Start: June 7, 1973, 15:15 UTC
End: June 7, 18:40 UTC
Duration: 3 hours, 25 minutes
Conrad and Weitz — EVA 3
Start: June 19, 1973, 10:55 UTC
End: June 19, 12:31 UTC
Duration: 1 hour, 36 minutes

## Mission highlights

[edit]

Paul J. Weitz, (left) Charles Conrad Jr. (middle); and Joseph P. Kerwin (right); in front of Skylab station on its Saturn V View during a "fly around" inspection Days in space  Mission  |

|

Skylab 2  |

Skylab 3 |

Skylab 4 |

The Skylab station suffered significant damage on its May 14 launch: its micrometeorite shield, and one of its primary solar arrays had torn loose during launch, and the remaining primary solar array was jammed. Without the shield which was designed to also provide thermal protection, Skylab baked in the Sun, and rising temperatures inside the workshop released toxic materials into the station's atmosphere and endangered on-board film and food. The first crew was supposed to launch on May 15, but instead had to train practicing repair techniques as they were developed by the engineers.[8]: 253–255, 259 Ground controllers purged the atmosphere with pure nitrogen four times, before refilling it with the nitrogen/oxygen atmosphere for the crew.[9] The secret National Reconnaissance Office used a KH-8 Gambit 3 to photograph the damaged station.[10]

On May 25, Skylab 2 lifted from LC-39B, the first Saturn IB launch in almost five years and only the second-ever launch from Pad 39B. Booster performance was nominal except for one momentary glitch that could have threatened the mission – when the Commit signal was sent to the Saturn at ignition, the instrument unit sent a command to switch the launch vehicle from internal to external power. This would have shut down the Saturn's electrical system, but not the propulsion system, and likely cause the disaster scenario of an uncontrollable booster, requiring the Launch Escape System to be activated and the Command Module pulled away to safety, followed by Range Safety destroying the errant launch vehicle. However, the duration of the cutoff signal was less than one second, too short a time for the electrical relay in the booster to be activated, so nothing happened and the launch proceeded as planned. This glitch was traced to a modification of the pad electrical equipment and corrective steps were taken to prevent it from happening again.[8]: 269 [11] On reaching the station, Conrad flew their Apollo Command and Service Module (CSM) around it to inspect the damage, then soft-docked with it to avoid the necessity of station keeping while the crew ate, and flight controllers planned the first repair attempt. Then they undocked so that Conrad could position the CSM by the jammed solar panel, and Weitz could perform a stand-up EVA, trying to free the array by tugging at it with a 10-foot hooked pole, while Kerwin held onto his legs. This failed, and consumed a significant amount of the Skylab's nitrogen maneuvering fuel to keep it steady in the process.

The crew then attempted to perform the hard dock to Skylab, but the capture latches failed to operate. After eight failed attempts, they donned their pressure suits again and partially dis-assembled the CSM's docking probe; the next attempt worked. Once inside the station, the crew deployed a collapsible parasol through the small scientific airlock to act as a sunshade. (This approach was suggested and designed by NASA's "Mr. Fix It" Jack Kinzler, who was awarded the NASA Distinguished Service Medal for the effort.) Successful deployment of the sunshade dropped inside temperatures to sustainable levels.[12]

View of Skylab from the Skylab 2 Command/Service Module during the final flyaround inspection

Two weeks later, Conrad and Kerwin performed a second EVA, freeing the stuck solar panel and increasing the electrical power to the workshop. They had prepared for this repair by practicing in the Neutral Buoyancy Simulator at the Marshall Space Flight Center. Without power from the panel, the second and third Skylab missions would have been unable to perform their main experiments, and the station's critical battery system would have been seriously degraded.[8]: 271–276 During this EVA, the sudden deployment of the solar panel structure caused both astronauts to be flung from the station's hull, testing their nerves as well as the strength of their safety tethers. After recovering their composure, both astronauts returned to their positions on the station and completed the EVA.[13]

For nearly a month they made further repairs to the workshop, conducted medical experiments, gathered solar and Earth science data, and performed a total of 392 hours of experiments. The mission tracked two minutes of a large solar flare with the Apollo Telescope Mount; they took and returned some 29,000 frames of film of the sun.[8]: 291 The Skylab 2 astronauts spent 28 days in space, which doubled the previous U.S. record. The mission ended successfully on June 22, 1973, when Skylab 2 splashing down in the Pacific Ocean 9.6 km from the recovery ship USS Ticonderoga. Skylab 2 set the records for the longest duration crewed spaceflight, greatest distance traveled and greatest mass docked in space. Conrad set the record for most time in space for an astronaut.

## Mission insignia

[edit]

The mission patch was designed by Kelly Freas, a well-known artist highly regarded in the science fiction community, who was suggested to NASA by science fiction author and editor Ben Bova. The insignia features Skylab above the earth with the sun in the background. In an article for Analog Science Fiction/Science Fact magazine, Freas said, "Among the suggestions the astronauts had made was the idea of a solar eclipse as seen from Skylab. It soon became clear that this idea would solve several problems at once: it pointed up the solar study function of Skylab, it would give me the large circular shape of the Earth as counterpoint to the angularity of the cluster, and it would establish firmly the connection of Skylab to the Earth. In addition, it would give a chance to get the necessary high contrast for good visibility of the tiny finished patch. ... I made several studies of cloud patterns on the planet, reducing them finally to very conventionalized swirls. The Skylab cluster was simplified and simplified again, till it became simply a black form with a white edgelight to set it off."

## Gallery

[edit]

* Kerwin blows water droplets from a straw.

* Weitz assists Kerwin with a blood pressure cuff.

## Spacecraft location

[edit]

The Skylab 2 command module is displayed at the National Museum of Naval Aviation, Pensacola, Florida. Different for earlier Apollo modules, Skylab ones had white paint on the sunward side to help with spacecraft thermal management.[14]

* Skylab 2 CM

* Skylab 2 CM

* Skylab 2 CM interior

## See also

[edit]

* Extra-vehicular activity
* List of spacewalks
* Timeline of longest spaceflights

## References

[edit]

1. ^ McDowell, Jonathan. "SATCAT". Jonathan's Space Pages. Retrieved March 23, 2014.
2. ^ a b "PART III: Skylab Development and Operations: February 1970-November 1974 (continued)". Skylab: A Chronology. NASA. Retrieved March 26, 2023.
3. ^ Gatland, Kenneth (1976). Manned Spacecraft (Second ed.). New York: MacMillan. p. 223\. ISBN 0-02-542820-9.
4. ^ a b "Skylab Numbering Fiasco". Living in Space. William Pogue Official WebSite. 2007. Archived from the original on February 2, 2009. Retrieved February 7, 2009.
5. ^ "Skylab 2 (1973)". Texas Archive of the Moving Image. Retrieved November 29, 2019.
6. ^ Pogue, William. "Naming Spacecraft: Confusion Reigns". collectSPACE. Retrieved April 24, 2011.
7. ^ Evans, Ben (2011). At Home in Space : The Late Seventies into the Eighties. New York: Springer. pp. 136–139, 142. ISBN 978-1-4419-8810-2. OCLC 756509282.136-139,+142&rft.pub=Springer&rft.date=2011&rft_id=info:oclcnum/756509282&rft.isbn=978-1-4419-8810-2&rft.aulast=Evans&rft.aufirst=Ben&rft_id=https://books.google.com/books?id=IWht0brbIfEC&pg;=PA136&rfr_id=info:sid/en.wikipedia.org:Skylab+2" class="Z3988">
8. ^ a b c d Compton, W. D.; Benson, C. D. (January 1, 1983). "Living and working in space. A history of Skylab" (PDF). Scientific and Technical Information Branch. NASA. Retrieved May 22, 2010.
9. ^ Skylab: A Chronology, May 14
10. ^ Day, Dwayne (May 20, 2013). "Those magnificent spooks and their spying machine: The spies help rescue Skylab". The Space Review. Retrieved July 10, 2020.
11. ^ Saturn 1B launch vehicle flight evaluation report, SA-206, Skylab-2 (PDF) (Report). NASA. July 23, 1973. Retrieved May 5, 2015.
12. ^ "SP-400 Skylab, Our First Space Station". NASA. 1977. Retrieved May 8, 2013.
13. ^ David J. Shayler, FBIS, Walking in Space, 2004, p. 213, Praxis Publishing Ltd.
14. ^ "Making The Command Module's Heat Shield". Spaceflight Blunders & Greatness. March 4, 2017. Retrieved December 23, 2018.

## External links

[edit]

Wikimedia Commons has media related to Skylab 2.

* Skylab: Command service module systems handbook, CSM 116 – 119 (PDF) April 1972
* Skylab Saturn 1B flight manual (PDF) September 1972
* NASA Skylab Chronology
* Marshall Space Flight Center Skylab Summary
* Skylab 2 Characteristics SP-4012 NASA HISTORICAL DATA BOOK
* Analog interview with Frank Kelly Freas

### Multimedia

[edit]

Media related to Skylab 2 at Wikimedia Commons

* Onboard flight film from the Skylab 2 mission

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|

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