Скайлаб-4: 84 күндік ғарыш сапары

Third crewed mission to Skylab

Skylab 4 (also SL 4 and SLM 3) was the third crewed Skylab mission and placed the third and final crew aboard the first American space station. The mission began on November 16, 1973, with the launch of Gerald P. Carr, Edward Gibson, and William R. Pogue in an Apollo command and service module on a Saturn IB rocket from the Kennedy Space Center, Florida, and lasted 84 days, one hour and 16 minutes. A total of 6,051 astronaut utilization hours were tallied by the Skylab 4 astronauts performing scientific experiments in the areas of medical activities, solar observations, Earth resources, observation of the Comet Kohoutek and other experiments. 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.

NASA's launch center was located in an area called Cape Kennedy since November 28, 1963. Cape Kennedy was restored to its former name of Cape Canaveral officially on October 9, 1973. The Saturn V launch facilities at LC 39A and LC 39B were still located at the Kennedy Space Center on Merritt Island. it launched from the Kennedy Space Center's LC 39B pad on November 16, 1973.

With three rookies, Skylab 4 was the largest all rookie crew launched by NASA. Following the all rookie Mercury program, there were only four all rookie NASA flights – Gemini 4, Gemini 7, Gemini 8, and Skylab 4.

The all rookie astronaut crew arrived aboard Skylab to find that they had company – three figures dressed in flight suits. Upon closer inspection, they found their companions were three dummies, complete with Skylab 4 mission emblems and name tags which had been left there by Al Bean, Jack Lousma, and Owen Garriott at the end of Skylab 3. Things got off to a bad start after the crew attempted to hide Pogue's early space sickness from flight surgeons, a fact discovered by mission controllers after downloading onboard voice recordings. Astronaut office chief Alan B. Shepard reprimanded them for this omission, saying they "had made a fairly serious error in judgement." The crew had problems adjusting to the same workload level as their predecessors when activating the workshop. The crew's initial task of unloading and stowing the thousands of items needed for their lengthy mission also proved to be overwhelming. The schedule for the activation sequence dictated lengthy work periods with a large variety of tasks to be performed, and the crew soon found themselves tired and behind schedule. Seven days into their mission, a problem developed in the Skylab gyroscopic attitude control system, which threatened to bring an early end to the mission. Skylab depended upon three large gyroscopes, sized so that any two of them could provide sufficient control and maneuver Skylab as desired. The third acted as a backup in the event of failure of one of the others. The gyroscope failure was attributed to insufficient lubrication. Later in the mission, a second gyroscope showed similar problems, but special temperature control and load reduction procedures kept the second one operating, and no further problems occurred. On Thanksgiving Day, Gibson and Pogue accomplished a 61/2 hour spacewalk. The first part of their spacewalk was spent deploying experiments and replacing film in the solar observatory. The remainder of the time was used to repair a malfunctioning antenna. During the experience, Gibson remarked, "Boy if this isn't the great outdoors! Inside, you're just looking out through a window. Here, you're right in it." The crew reported that the food was good, but slightly bland. The quantity and type of food consumed was rigidly controlled because of their strict diet. Although the crew would have preferred to use more condiments to enhance the taste of the food, and the amount of salt they could use was restricted for medical purposes, by the third mission the NASA kitchen had increased the availability of condiments, and salt and pepper was in liquid solutions (granular salt and pepper brought aboard by the second crew was little more than "air pollution"). On December 13, the crew sighted Comet Kohoutek and trained the solar observatory and hand held cameras on it. They gathered spectra on it using the Far Ultraviolet Camera/Spectrograph. They continued to photograph it as it approached the Sun. On December 30, as it swept out from behind the Sun, Carr and Gibson spotted it as they were performing a spacewalk. As Skylab work progressed, the astronauts complained of being pushed too hard, and ground controllers complained they were not getting enough work done. NASA determined major contributing factors were a large number of new tasks added shortly before launch with little or no training, and searches for equipment out of place on the station. There was a radio conference to air frustrations which led to the workload schedule being modified, and by the end of their mission the crew had completed even more work than originally planned. Skylab 4 was noted for several important scientific contributions. The crew spent many hours studying the Earth. Carr and Pogue alternately crewed controls, operating the sensing devices which measured and photographed selected features on the Earth's surface. Gibson and the other crew made solar observations, recording about 75,000 new telescopic images of the Sun. Images were taken in the X ray, ultraviolet, and visible portions of the spectrum. As the end of their mission drew closer, Gibson continued his watch of the solar surface. On January 21, 1974, an active region on the Sun's surface formed a bright spot which intensified and grew. Gibson quickly began filming the sequence as the bright spot erupted. This film was the first recording from space of the birth of a solar flare. The crew also photographed the Earth from orbit. Despite instructions not to do so, the crew (perhaps inadvertently) photographed Area 51, causing a minor dispute between various government agencies as to whether the photographs showing this secret facility should be released. In the end, the picture was published along with all others in NASA's Skylab image archive, but remained unnoticed for years. The Skylab 4 astronauts completed 1,214 Earth orbits and four EVAs totaling 22 hours, 13 minutes. They traveled 34.5 million miles (55,500,000 km) in 84 days, 1 hour and 16 minutes in space. Skylab 4 was the last Skylab mission; the station fell from orbit in 1979. The three astronauts had joined NASA in the mid 1960s, during the Apollo program, with Pogue and Carr becoming part of the likely crew for the cancelled Apollo 19. Ultimately none of the crew of Skylab 4 flew in space again, as none of the three had been selected for Apollo–Soyuz and all of them retired from NASA before the first Space Shuttle launch. Gibson, who had trained as a scientist astronaut, resigned from NASA in December 1974 to do research on Skylab solar physics data, as a senior staff scientist with The Aerospace Corporation of Los Angeles, California.

An unplanned communications break occurred during the Skylab 4 mission: its crew did not communicate with mission control for the portion of one orbit during which Skylab had line of sight to its tracking stations. Before the midpoint of the mission, the Skylab 4 crew had started to become fatigued and behind on the work. In order to catch up, they decided that only one crew member needed to be present for the daily briefing instead of all three, allowing the other two to complete ongoing tasks. Both Carr and Gibson stated that this event partially contributed to a discussion on December 30, 1973, in which the crew and ground control capsule communicator Richard H. Truly revisited the astronauts' schedule in light of their fatigue. Carr called this meeting "the first sensitivity session in space". has been extensively studied as a case study in various fields of endeavor including space medicine, team management, and psychology. Man hours in space were, and continued to be into the 21st century, an expensive undertaking; a single day on Skylab was worth about $22.4 million in 2017 dollars, and thus any work stoppage was considered inappropriate due to the expense.

The Skylab 4 command module was transferred to the National Air and Space Museum in 1975. This module is the Command and Service Modules CSM 118 and it spent 84 days in Earth orbit as part of the Skylab mission. As of September 2020 it is on display at the Oklahoma History Center. The windows of the Skylab 3 and 4 spacecraft modules were studied for micrometeoroid impacts. The module was painted white on half its side to help with spacecraft thermal management. Whereas Block II Apollo CSM had Kapton coated with aluminium and silicon monoxide, later Skylab modules had white paint for the sunward side. The capsule is now on display at the Oklahoma History Center in Oklahoma City.

The triangular emblem features a large number 3 and a rainbow circling three areas of study the astronauts pursued. At the time of the flight, the astronauts issued the following description:

"The symbols in the patch refer to the three major areas of investigation in the mission. The tree represents man's natural environment and refers to the objective of advancing the study of earth resources. The hydrogen atom, as the basic building block of the universe, represents man's exploration of the physical world, his application of knowledge, and his development of technology. Since the sun is composed primarily of hydrogen, the hydrogen symbol also refers to the Solar Physics mission objectives. The human silhouette represents mankind and the human capacity to direct technology with a wisdom tempered by his regard for his natural environment. It also relates to the Skylab medical studies of man himself. The rainbow, adopted from the Biblical story of the Flood, symbolizes the promise that is offered to man. It embraces man and extends to the tree and hydrogen atom, emphasizing man's pivotal role in the conciliation of technology with nature by a humanistic application of our scientific knowledge." Some versions of the patch included a comet in the top curve because of studies made of the comet Kohoutek.