Girish Mahajan (Editor)

AS 104 (spacecraft)

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Operator  NASA
SATCAT no.  1385
COSPAR ID  1965-039B
Mission duration  5,275 days
AS-104 (spacecraft)
Mission type  Spacecraft aerodynamics; micrometeroid investigation
Distance travelled  3,282,050,195 kilometers (2.039371443×10 mi)

AS-104 was the fourth orbital test of a boilerplate Apollo spacecraft, and the second flight of the Pegasus micrometeroid detection satellite. It was launched by SA-8, the ninth Saturn I carrier rocket.



The primary mission objective was to demonstrate the launch vehicle iterative guidance mode and evaluation of system accuracy. The launch trajectory was similar to that of mission AS-103.

The Saturn launch vehicle (SA-8) and payload were similar to those of mission AS-103 except that a single reaction control engine assembly was mounted on the boilerplate service module (BP-26) and the assembly was instrumented to acquire additional data on launch environment temperatures. This assembly also differed from the one on the AS-101 mission in that two of the four engines were of a prototype configuration instead of all engines being simulated.


This was the first nighttime launch in the Saturn I series. A built-in 35 minute hold was used to ensure that launch time coincided with the opening of the launch window.

AS-104 was launched from Cape Kennedy Launch Complex 37B at 02:35:01 a.m. EST (07:35:01 GMT) on May 25. 1965, The launch was normal and the payload was inserted into orbit approximately 10.6 minutes after lift-off. The total mass placed in orbit, including the spacecraft, Pegasus B, adapter, instrument unit, and S-IV stage, was 34,113 pounds (15,473 kg). The perigee and apogee were 314.0 and 464.1 miles (505 and 747 km), respectively; the orbital inclination was 31.78'. The 1397 kilogram (3080-pound) Pegasus 2 satellite was also carried to orbit by SA-8, being stowed inside the boilerplate's service module, and remaining attached to the S-IV stage.

The actual trajectory was close to the one predicted, and the spacecraft was separated 806 seconds after lift-off. Several minor malfunctions occurred in the S-I stage propulsion system; however, all mission objectives were achieved.


AS-104 (spacecraft) Wikipedia

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