AS-104 was the fourth orbital test of a boilerplate Apollo spacecraft, and the second flight of the Pegasus micrometeoroid detection satellite. It was launched by SA-8, the ninth Saturn I carrier rocket.
 Launch of Saturn AS-104 | |
| Mission type | Spacecraft aerodynamics; micrometeoroid investigation |
|---|---|
| Operator | NASA |
| COSPAR ID | 1965-039B |
| SATCAT no. | 1385 |
| Mission duration | 8,810 days[1] |
| Distance travelled | 3,282,050,195 kilometers (2.039371443×109 mi) |
| Orbits completed | ~79,790 |
| Spacecraft properties | |
| Spacecraft | Apollo BP-26 Pegasus 2 |
| Launch mass | 1,451.5 kilograms (3,200 lb) |
| Start of mission | |
| Launch date | May 25, 1965, 07:35:01 UTC |
| Rocket | Saturn I SA-8 |
| Launch site | Cape Kennedy LC-37B |
| End of mission | |
| Decay date | July 8, 1989[1] |
| Orbital parameters | |
| Reference system | Geocentric |
| Regime | Low Earth orbit |
| Perigee altitude | 511 kilometers (318 mi) |
| Apogee altitude | 739 kilometers (459 mi) |
| Inclination | 31.7 degrees |
| Period | 97.2 minutes |
| Epoch | 4 July 1965[2] |
Objectives edit
The primary mission objective was to demonstrate the launch vehicle's iterative guidance mode and to evaluate 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). 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.
Launch edit
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 2:35:01 a.m. EST (07:35:01 GMT) on May 25, 1965.[3] 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.[4][5]
References edit
- ^ a b "Apollo Model 4". n2yo.com. Retrieved February 3, 2023.
- ^ McDowell, Jonathan. "Satellite Catalog". Jonathan's Space Page. Retrieved October 31, 2013.
- ^ "May 1965". Saturn Illustrated Chronology - Part 6 January 1965 through December 1965. NASA. Retrieved February 3, 2023.
- ^ Pack, P. B.; Solmon, G.W. (May 17, 1965). "SA-8 operational trajectory". Retrieved February 3, 2023.
- ^ Weichel, H. J. (August 2, 1965). "SA-8 flight test data report". NASA. Retrieved February 3, 2023.
External links edit
This article incorporates public domain material from websites or documents of the National Aeronautics and Space Administration.