Apollo 15
Crew
Position
Astronaut
Commander
David R. Scott
Third spaceflight
Command Module Pilot
Alfred M. Worden
First spaceflight
Lunar Module Pilot
James B. Irwin
First spaceflight
All three astronauts on the all-Air Force crew received either an honorary degree or Master’s degree from the University of Michigan, including Scott’s honorary degree, awarded in the Spring of 1971, just months before the launch. Scott did attend the University of Michigan, but left before graduating to accept an appointment to West Point. The crew did their undergraduate work at West Point or the United States Naval Academy.
Backup crew
Position
Astronaut
Commander
Richard F. Gordon, Jr.
Command Module Pilot
Vance D. Brand
Lunar Module Pilot
Harrison H. Schmitt
Schmitt was the first member of Group 4 to be selected as either a prime or backup crew member for an Apollo flight.
Support crew
Joseph P. Allen
Robert A. Parker
Karl G. Heinze
Flight directors
Gerry Griffin, Gold team
Milton Windler, Maroon team
Glynn Lunney, Black team
Gene Kranz, White team
Mission parameters
Mass:
Launch mass: 2,921,005 kg
Total spacecraft: 46,782 kg
CSM mass: 30,354 kg, of which CM was 5840 kg, SM 24,514 kg
LM mass: 16,428 kg, ascent stage at lunar liftoff 4,951 kg
Earth orbits: 3 before leaving for Moon, about one on return
Lunar orbits: 74
Earth parking orbit
Perigee: 169.5 km
Apogee: 171.3 km
Inclination: 29.679
Period: 87.84 min
LM-CSM docking
Undocked: 1971-07-30 – 18:13:16 UTC
Docked: 1971-08-02 – 19:10:25 UTC
EVAs
Scott – Stand up EVA – LM upper hatch
Start Stand Up EVA: 1971-07-31, 00:16:49 UTC
End Stand Up EVA: July 31, 00:49:56 UTC
Duration: 33 minutes, 07 seconds
Scott and Irwin – EVA 1
EVA 1 Start: 1971-07-31, 13:12:17 UTC
EVA 1 End: July 31, 19:45:59 UTC
Duration: 6 hours, 32 minutes, 42 seconds
Scott and Irwin – EVA 2
EVA 2 Start: 1971-08-01, 11:48:48 UTC
EVA 2 End: August 1, 19:01:02 UTC
Duration: 7 hours, 12 minutes, 14 seconds
Scott and Irwin – EVA 3
EVA 3 Start: 1971-08-02, 08:52:14 UTC
EVA 3 End: August 2, 13:42:04 UTC
Duration: 4 hours, 49 minutes, 50 seconds
Worden (Irwin – Stand up) – Transearth EVA 4
EVA 4 Start: 1971-08-05, 15:31:12 UTC
EVA 4 End: August 5, 16:10:19 UTC
Duration: 39 minutes, 07 seconds
Planning and training
Commander Dave Scott during geology training in New Mexico on March 19, 1971.
The crew for Apollo 15 had previously served as the backup crew for Apollo 12. There had been a friendly rivalry between that prime and backup crew on that mission, with the prime being all Navy, and the backup all Air Force.
Originally Apollo 15 would have been an H mission, like Apollos 12, 13, 14. But on September 2, 1970, NASA announced it was cancelling what were to be the current incarnations of the Apollo 15 and Apollo 19 missions. To maximize the return from the remaining missions, Apollo 15 would now fly as a J mission and have the honor of carrying the first Lunar Rover.
One of the major changes in the training for 15 was the geology training. Although on previous flights the crews had been trained in field geology, for the first time 15 would make it a high priority. Scott and Irwin would train with Leon Silver, a Caltech geologist who on Earth was interested in the Precambrian. Silver had been suggested by Harrison Schmitt as an alternative to the classroom lecturers that NASA had previously used. Among other things, Silver had made important refinements to the methods for dating rocks using the decay of uranium into lead in the late 1950s.
At first Silver would take the prime and backup crews to various geological sites in Arizona and New Mexico as if for a normal field geology lesson, but as launch time approached, these trips became more realistic. Crews began to wear mock-ups of the backpacks they would carry, and communicate using walkie-talkies to a CapCom in a tent. (During a mission the Capsule Communicators (CapComs), always fellow astronauts, were the only people who normally would speak to the crew). The CapCom was accompanied by a group of geologists unfamiliar with the area who would rely on the astronauts’ descriptions to interpret the findings.
The decision to land at Hadley came in September 1970. The Site Selection Committees had narrowed the field down to two sites Hadley Rille or the crater Marius, near which were a group of low, possibly volcanic, domes. Although not ultimately his decision, the commander of a mission always held great sway. To Dave Scott the choice was clear, with Hadley, being “exploration at its finest”.
Command Module Pilot Al Worden undertook a different kind of geology training. Working with an Egyptian, Farouk El-Baz, he flew over areas in an airplane simulating the speed at which terrain would pass below him while in the CSM in orbit. He became quite adept at making observations as the object traveled below.
Hardware
The Lunar Roving Vehicle, or the Rover, had been in development since May 1969, with the contract awarded to Boeing. It could be folded into a space 5 ft by 20 in (1.5 m by 0.5 m). Unloaded it weighed 460 lb (209 kg) and when carrying two astronauts and their equipment, 1500 lb (700 kg). Each wheel was independently driven by horsepower (200 W) electric motor. Although it could be driven by either astronaut, the Commander always drove. Travelling at speeds up to 6 to 8 mph (10 to 12 km/h), it meant that for the first time the astronauts could travel far afield from their lander and still have enough time to do some serious scientific experiments.
The Saturn V that launched Apollo 15 was designated SA-510, the tenth flight-ready model of the rocket. Apollo 15 used Command/Service Module CSM-112, which was given the callsign Endeavour, named after the HM Bark Endeavour and Lunar Module LM-10, callsign Falcon, named after the United States Air Force Academy mascot. If Apollo 15 had flown as an H mission it would have been with CSM-111 and LM-9. That CSM was used by the Apollo Soyuz Test Project but the Lunar Module went unused and is now on display at the Kennedy Space Center.
As the payload of the rocket was greater, changes were made to its launch trajectory and Saturn V itself. The rocket was launched in a more southerly direction (80100 degrees azimuth) and the Earth parking orbit lowered to 166 km (90 nautical miles) above the Earth’s surface. These two changes meant 1100 pounds (500 kg) more could be launched. The propellant reserves were reduced and the number of retrorockets on the S-IC first stage reduced from eight to four. The four outboard engines of the S-IC would be burned longer and the center engine would also burn longer before being shut down (see Saturn V for more information on the launch sequence). Changes were also made to the S-II second stage to stop pogo oscillations.
On the Lunar Module, the fuel and oxidizer tanks were enlarged on both the descent and ascent stages and the engine bell on the descent stage was extended. Batteries and solar cells were added for increased electrical power. In all this increased the weight of the Lunar Module to 36,000 pounds (16,330 kilograms), 4000 pounds (1800 kg) heavier than previous models.
The astronauts themselves wore new spacesuits. On all previous Apollo flights, including the non-lunar flights, the commander and lunar module pilot had worn suits with the life support, liquid cooling, and communications connections in two parallel rows of three. On Apollo 15, the new suits, dubbed the “A7L-B,” had the connectors situated in triangular pairs. This new arrangement, along with the relocation of the entry zipper (which went in an up-down motion on the old suits), from the right shoulder to the left hip, allowed the inclusion of a new waist joint, allowing the astronauts to bend completely over, and even to sit on the rover. Upgraded backpacks allowed for longer-duration moonwalks, and the command module pilot, who wore a suit with three connectors, would wear a five-connector version of the old moon suit the liquid cooling water connector being removed, as the command module pilot would make a “deep-space EVA” to retrieve film cartridges on the flight home.
Apollo 15 SM SIM bay (NASA)
Technicians at the Kennedy Space Center had many problems with the SIM bay. It was the first time it had flown and experienced problems from the start. Problems came from the fact the instruments were designed to operate in zero gravity, but had to be tested in the 1 g on the surface of the Earth. As such, things like the 7.5 m booms for the mass and gamma ray spectrometers could only be tested using railings that tried to mimic the space environment, and so they never worked particularly well. When the technicians tried to integrate the entire bay into the rest of the spacecraft, data streams would not synchronize, and lead investigators of the instruments would want to make last minute checks and changes. When it came time to test the operation of the gamma-ray spectrometer, it was necessary to stop every engine within 10 miles (16 km) of the test site.
Once all the various components had been installed on the Saturn V, it was moved to the launch site, Launch Complex 39A. During late June and early July 1971, the rocket and Mobile Service Structure were struck by lightning at least four times. All was well however, with only minor damage suffered.
Mission highlights
Launch incident
Shortly after the Saturn V first stage separation, the instrumentation on the spent Stage 1 went dead. This was traced to the exhaust of Stage 2 striking the stage and burning out the electronics. This was later traced to a reduction in the number of Stage 1 retrofire charges from 8 to 4, a weight-saving measure first used on this mission to improve the launch vehicle performance. It was discovered that the two stages were in fact uncomfortably close following stage separation, due to the slow thrust decay of the F-1 engines, and failure of any one charge could have caused a collision. Subsequent flights returned to the original retrofire configuration.
Outward journey
of a series on
Apollo 15.
Outward journey
Solo operations
Lunar surface
Return to Earth
Main article: Apollo 15, Outward journey
Launching at 9:34:00 am EDT on 1971-07-26, Apollo 15 would take four days to reach the Moon. After spending two hours in orbit around the Earth, the S-IVB third stage of the Saturn V was reignited to send them to the Moon.
During the retrieval of the LM from its stowed position below the CSM, a light came on the control panel that indicated the valves of the Service Propulsion System were open and the engine should be firing. A short was found in a switch that controlled all the redundant valves for the engine. New procedures were developed to deal with this. During their first inspection of the LM, Scott and Irwin found that the glass cover of a tapemeter had broken forcing them to clean up the glass shards lest they breathe them in.
On the fourth day they entered into lunar orbit and prepared for lunar descent.
Orbital observations
Main article: Apollo 15, Solo operations
During the three day explorations of the Moon by Scott and Irwin, Worden had a busy schedule of observations. Apollo 15 was the first mission to carry the SIM bay, which contained a panoramic camera, gamma ray spectrometer, mapping camera, laser altimeter and mass spectrometer. Worden had to operate the shutter and lenses on the camera and turn on and off the various instruments. During the coast back to Earth, he would perform an EVA to retrieve film cassettes from the cameras. His photographs and observations led to the selection of Taurus Littrow as the future Apollo 17 landing site.
Lunar surface
Main article: Apollo 15, Lunar surface
Panoramic Assembly of Apollo 15 Landing Site (Moonpans)
Apollo 15 was the first mission to perform three EVAs on the lunar surface. After landing at 268 N 338 E, Scott removed the top hatch of the LM to perform a site survey, take some panoramic photographs and get a brief overview of the surrounding areas. This was the only stand up EVA performed during any of the Apollo lunar landing missions.
On the first EVA the crew drove the Rover south to sample the area at Elbow Crater. The planned stop at Station 2 was eliminated due to time constraints. The crew continued to the base of Mount Hadley Delta where they sampled the only small boulder they could find. They then drove back the LM where Irwin picked up and deployed the Apollo Lunar Surface Experiment Package (ALSEP) while Scott unloaded the samples from the rover. Scott had extreme difficulty drilling the holes for the heat-flow experiment, forcing him to come back the next day to complete the task. The cause of Scott’s troubles was ultimately determined to be a faulty design of the drill stems. The stems have external flutes to carry the drill cuttings to the surface but, because of the relatively low strength of the fiberglass/boron-filament laminate of which these stems were made – chosen because of their thermal characteristics – the walls were made thicker at the joins by decreasing the depth of the flutes.
The second EVA again took Scott and Irwin to the base of Mount Hadley Delta but they went up its slope. Here Irwin found the Genesis Rock sitting atop another rock as if it were perched on a pedestal. Returning to the LM, Scott completed the heat flow holes and began on a core sample which once again was extremely difficult to drill. He was once again forced to leave it for the next day. Scott strained so hard trying to remove the core tube sample that his finger tips were bruised and sore for two weeks. He was finally able to extract the tubes with a little help from Irwin.
The difficulties with the core sample meant the cancellation of the traverse to the North Complex. The crew still traveled to the edge of Hadley Rille. Returning to the LM for the last time, Scott simultaneously dropped a falcon feather and his geology hammer to prove Galileo Galilei’s theory that in a vacuum, objects of different mass accelerate at the same rate, which they did. Before Scott could pick up the feather and return it to earth, Irwin inadvertently stepped on the feather, which buried it in the lunar soil forever.
The astronauts spent 18 hours and 37 minutes exploring the moon’s surface in their electronic moonbuggy. The astronaunts joked that they wanted to explore all day. Scott said, “I wish we could just sit down and play with the rocks for a while. Look at these things. Theye shiny, sparkling.”
Apollo 15’s lunar plaque
On LRV 1, a plaque was attached bearing the inscription:
MANS FIRST WHEELS ON THE MOON, DELIVERED BY FALCON, 1971-07-30
And the signatures of the Apollo 15 Astronauts.
Return to Earth
Main article: Apollo 15, Return to Earth
After lifting off from the lunar surface, Falcon and Endeavour rendezvoused and docked. After transferring across the lunar samples and other equipment, Falcon was jettisoned. It would fire its rocket engine to cause it to impact the lunar surface. During lunar liftoff, Al Worden played the United States Air Force song “Wild Blue Yonder”, signifying the all-Air Force makeup of the Apollo 15 crew. The plan was to play the song after Falcon was well in orbit, but he started the song a few seconds after liftoff, making it hard for Falcon’s crew to hear the conversation with mission control. When Worden realized his mistake, he stopped the song and started it again a few minutes later as originally planned.
The period from the final moonwalk to the lunar ascent and rendezvous with Endeavour proved to be physically and mentally exhausting for the crew and ground controllers, and led to serious problems. By the time of rendezvous, Scott and Irwin had gone 20 hours without sleep, including a grueling third EVA on the lunar surface. It was later determined they had depleted their body fluid electrolytes, and both men began to show heart irregularities. In Irwin’s case this was particularly serious, and after the flight he would eventually suffer two heart attacks. After the demanding lunar orbit rendezvous and docking, coordination between the exhausted crew and mission controllers broke down, delaying the jettison of Falcon’s spent ascent stage. Learning from this experience, NASA changed the training and flight schedules of the two subsequent Apollo lunar landing missions to allow a full sleep period before liftoff from the lunar surface, and added supplemental electrolytes to the crew’s diet.
Apollo 15 spent one more day in lunar orbit, continuing the observations of Worden. After releasing a subsatellite, the crew ignited their Service Propulsion engine to put them on a trajectory back to Earth. The next day, Worden performed an EVA to retrieve the film cassettes from the SIM bay cameras, the first deep-space EVA performed outside of earth orbit.
The Apollo 15 spacecraft splashed down safely despite a parachute failure.
The twelfth day in space was uneventful, with Mission Control holding a press conference where the astronauts were asked questions submitted by the news media. On their 13th and final day they prepared for reentry. During descent, one of their parachutes failed, meaning they landed under only two. Thankfully, the third parachute was added for redundancy and they landed successfully, although the landing was harder than usual.
Scandals
Further information: Apollo 15 postage stamp incident
Dave Scott’s space suit on display at the NASM.
After a highly successful mission, the reputation of the crew and NASA was tarnished somewhat by a deal they made with H. Walter Eiermann, an American citizen who had many professional and social contacts with NASA employees and the astronaut corps. Scott had carried 398 unauthorized First-Day Covers in his spacesuit. Eiermann had promised each astronaut US$7,000 in the form of savings accounts in return for 100 covers signed after having returned from the Moon. He told them that he would not advertise or sell the covers until the end of the Apollo program. Irwin wrote in his book To Rule the Night that the astronauts had agreed to the deal as a way to help finance their children’s college tuition.
Scott sent 100 of these covers to Eiermann to Stuttgart, Germany. Eiermann then passed them on to the stamp dealer Hermann E. Sieger from Lorch, Germany, who had previously approached him and had suggested the deal. Sieger proceeded to sell the covers for an average price of US$1,500 in a public sale in Germany. On hearing this news, Scott contacted Eiermann, asking him to stop the sale. The crew also decided against receiving any money from Eiermann. NASA took possession of the remaining 298 covers.
All three crew members were formally reprimanded and their personnel evaluation Officer Efficiency Reports were changed to reflect a formal finding of “lack of judgment.” Worden was reassigned within NASA from flight status. Scott was not reassigned. He had already begun working on the design of the docking module for the upcoming ASTP mission when the cover scandal broke. Irwin resigned to form “High Flight”, a Christian outreach ministry based in Colorado. Congressional questioning of NASA officials about the “Stamp Affair” caused further embarrassment for the agency as the Apollo program wound down.
Another minor controversy centered around two timepieces, a watch and stopwatch, carried by Scott. He had agreed to evaluate the timepieces for the manufacturer at the request of a friend. Thinking they might be useful, particularly for the possible timing of a manually controlled emergency propulsion maneuver, Scott took them along on the mission without prior authorization.
One final controversial event happened after the flight. The crew had contacted Belgian sculptor Paul Van Hoeydonck to create a small statuette to personally commemorate those astronauts and cosmonauts having lost their lives in the furtherance of space exploration. The small aluminium sculpture called “Fallen Astronaut” was left on the Moon next to the Rover at the end of EVA 3, along with a plaque bearing the names of fourteen American astronauts and Russian cosmonauts. Unknown at the time, two of the original selection of 20 cosmonauts were also deceased before Apollo 15: Valentin Bondarenko (fire during training, March 1961) and Grigori Nelyubov (train accident/suicide, February 1966). Therefore, their names were not included on the plaque. The memorial was left while the TV camera was turned off. Only Irwin knew what Scott was doing at the time. Scott told mission control he was doing some clean up activities around the rover so they wouldn’t know what he was doing. They had agreed with Van Hoeydonck that no replicas were to be made. After mentioning the statuette during their post-flight press conference, the National Air and Space Museum contacted the crew asking for a replica made for the museum, and Van Hoeydonck subsequently advertised replicas for sale to the public. Under pressure from NASA, Van Hoeydonck withdrew the sale offer.
Spacecraft locations
Apollo 15’s current location
The Command Module Endeavour is displayed at the National Museum of the United States Air Force, Wright-Patterson Air Force Base, Dayton, Ohio.
The Lunar Module Falcon descent stage and LRV 1 remain at the landing site at 26 7′ 55.99″ N 3 38′ 1.90″ E.
Falcon’s ascent stage impacted the Moon 3 August 1971 at 03:03:37.0 UT (2 August, 11:03 PM EDT) 26.36 N, 0.25 E.
Mission insignia
Robbins Medallion from Apollo 15
The circular patch features stylized red, white and blue birds flying over the Hadley Rille section of the moon. Immediately behind the birds, a line of craters form the Roman numeral XV. The artwork is circled in red, with a white band giving the mission and crew names and a blue border. Scott contacted fashion designer Emilio Pucci to design the patch, who came up with the basic idea of the three-bird motif. The crew changed the colors from blues and greens to more patriotic red, white and blue.
Visibility from space
The halo area of the Apollo 15 Landing site, generated by the LM’s exhaust plume, was observed by a camera aboard the Japanese lunar orbiter SELENE and confirmed by comparative analysis of photographs in May 2008. This corresponds well to photographs taken from the Apollo 15 Command Module showing a change in surface reflectivity due to the plume, and is the first visible trace of manned landings on the moon seen from space since the close of the Apollo program. This evidence is important due to accusations that the moon landings were staged.
Multimedia
Apollo 15
Rover training – Scott and Irwin train on Earth to use the Lunar Rover. (2.57 MB, ogg/Theora format).
Launch of Apollo 15 – Launch of Apollo 15 running from T-30s through to T+40s. (1.29 MB, ogg/Theora format).
Transposition, Docking and Extraction – Endeavour comes into dock with Falcon (3.03 MB, ogg/Theora format).
CSM moving away – Endeavour filmed from Falcon after undocking. (3.05 MB, ogg/Theora format).
Landing on the Moon- The landing on the Moon at Hadley seen from the perspective of the Lunar Module Pilot. Starts at about 5000 feet. (5.47 MB, ogg/Theora format).
Onboard the Lunar Rover – 16 mm film sequence of driving the Lunar Rover. (3.26 MB, ogg/Theora format).
Hammer and Feather Drop – Scott demonstrates that Galileo was right. (1.38 MB, ogg/Theora format).
Liftoff from the Moon – The liftoff from the Moon as seen by the TV camera on the Rover. (2.31 MB, ogg/Theora format).
Liftoff from the Moon – The liftoff from the Moon as from the perspective of the Lunar Module Pilot. (1.18 MB, ogg/Theora format).
Worden’s EVA – Worden undertakes an EVA to retrieve film cassettes from the Science Instrument Module. (2.81 MB, ogg/Theora format).
Splashdown – Descent and splashdown of Apollo 15. (3.67 MB, ogg/Theora format).
An experiment at LBNL involving high energy particles from a cyclotron used to investigate the origin of the flashes of light seen by Apollo astronauts on their way to the Moon. Experiments were also done onboard Apollo 15, 16 and 17 and Skylab to investigate this phenomenon with the “Light Flashes Experiment Package” (a box of instrumentation worn on the head during light flash count sequences) flying on Apollo 16 and 17.
Depiction in fiction
Portions of the Apollo 15 mission are dramatized in the miniseries From the Earth to the Moon episode entitled “Galileo was Right”.
See also
Extra-vehicular activity
List of spacewalks
Splashdown
List of artificial objects on the Moon
Google Moon
Notes
^ Richard W. Orloff. “Apollo by the Numbers: A Statistical Reference (SP-4029)”. NASA. http://history.nasa.gov/SP-4029/Apollo_00g_Table_of_Contents.htm. Retrieved 2009-07-18.
^ a b “Apollo 15: 1971 Year in Review, UPI.com”
^ a b Apollo Lunar Surface Journal
^ Two Sides of the Moon, by David Scott and Alexei Leonov, Simon & Schuster, 2004
^ The “halo” area around Apollo 15 landing site observed by Terrain Camera on SELENE(KAGUYA)
^ Light Flashes Experiment
References
NASA Apollo 15 press kit – July 15, 1971
Chaikin, Andrew (1994). A Man On The Moon: The Voyages of the Apollo Astronauts. Viking. ISBN 0-670-81446-6.
Harland, David M. (1999). Exploring the Moon: The Apollo Expeditions. Springer/Praxis Publishing. ISBN 1-85233-099-6.
NASA Manned Spacecraft Center (1972). Apollo 15 Preliminary Science Report. Scientific and Technical Office, NASA.
Lattimer, Dick (1985). ‘All We Did was Fly to the Moon. Whispering Eagle Press. ISBN 0-9611228-0-3.
Apollo 15 Flight Journal. Retrieved on 2005-06-17
Apollo 15 Lunar Surface Journal. Retrieved on 2005-06-17
Apollo By The Numbers: A Statistical Reference by Richard W. Orloff (NASA). Retrieved on 2005-06-17
Moonport: A History of Apollo Launch Facilities and Operations. Retrieved on 2005-06-17
Apollo 15 in the Encyclopedia Astronautica. Retrieved on 2005-06-17
Apollo 15 | Endeavour in A Field Guide to American Spacecraft.
Apollo 15 Launch Video
Apollo Program Summary Report. Retrieved on 2005-06-17
NSSDC Apollo 15 page. Retrieved on 2007-12-20
NASA (1972-09-15). Articles Carried on Manned Space Flights. Press Release.
Sieger Flown Moon Covers. Retrieved on 2005-06-18
In the Mountains of the Moon NASA film on the Apollo 15 mission (Part 1) (Part 2)
Apollo 15 television transmissions ApolloTV.net Video
Wikimedia Commons has media related to: Apollo 15
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Missions of the Apollo program
Rocket tests
SA-1 SA-2 SA-3 SA-4 SA-5 AS-203 (Apollo 2)
Abort tests
QTV Pad Abort Test-1 A-001 A-002 A-003 Pad Abort Test-2 A-004
Boilerplate tests
A-101 A-102 A-103 A-104 A-105
Unmanned missions
AS-201 AS-202 (Apollo 3) Apollo 4 Apollo 5 Apollo 6 Skylab 1
LEO missions
Apollo 7 Apollo 9 Skylab 2 Skylab 3 Skylab 4 Apollo-Soyuz Test Project
Lunar missions
Apollo 8 Apollo 10 Apollo 11 Apollo 12 Apollo 13 Apollo 14 Apollo 15 Apollo 16 Apollo 17
Apollo 1 (AS-204) List of missions Canceled missions
Categories: Apollo 15 | Apollo program | Lunar human spaceflights | Lunar spacecraft | Sample return missions
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