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Twenty-five years ago today, the USAF/LTV ASM-135 anti-satellite missile successfully intercepted a target satellite orbiting 300 nautical miles above the Earth.  The test was the first and only time that an aircraft-launched missile successfully engaged and destroyed an orbiting spacecraft.

The United States began testing anti-satellite missiles in the late 1950’s.  These and subsequent vehicles used nuclear warheads to destroy orbiting satellites.  A serious disadvantage of this approach was that a nuclear detonation intended to destroy an adversary satellite will likely damage nearby friendly satellites as well.

By the mid 1970’s, the favored anti-satellite (ASAT) approach had changed from nuclear detonation to kinetic kill.  This latter approach required the interceptor to directly hit the target.  The 15,000-mph closing velocity provided enough kinetic energy to totally destroy the target.  Thus, no warhead was required.

The decision to proceed with development and deployment of a US kinetic kill weapon was made by President Jimmy Carter in 1978.  Carter’s decision came in the aftermath of the Soviet Union’s successful demonstration of an orbital anti-satellite system.

LTV Aerospace was awarded a contract in 1979 to develop the Air-Launched Miniature Vehicle (ALMV) for the USAF.  The resulting anti-satellite missile (ASM) system was designated the ASM-135.  The two-stage missile was to be air-launched by a USAF F-15A Eagle executing a zoom climb.  In essence, the aircraft acted as the first stage of what was effectively a 3-stage vehicle.

The ASM-135 was 18-feet in length and 20-inches diameter.  The 2,600-lb vehicle was launched from the centerline station of the host aircraft.  The ASM consisted of a Boeing SRAM first stage and an LTV Altair 3 second stage.  The vehicle’s payload was a 30-lb kinetic kill weapon known as the Miniature Homing Vehicle (MHV).

The ASM-135 was first tested in flight on Saturday, 21 January 1984.  While successful, the missile did not carry a MHV.  On Tuesday, 13 November 1984, a second ASM-135 test took place.  Unfortunately, the missile failed when the MHV that it was carrying was aimed at a star that served as a virtual target.  Engineers went to work to make the needed fixes.

In August of 1985, a decision was made by President Ronald Reagan to launch the next ASM-135 missile against an orbiting US satellite.  The Solwind P78-1 satellite would serve as the target.  Congress was subsequently notified by the Executive Branch regarding the intended mission.

The historic satellite takedown mission occurred on Friday, 13 September 1985.  USAF F-15A (S/N 77-0084), stationed at Edwards Air Force Base, California and code-named Celestial Eagle, departed nearby Vandenberg Air Force Base carrying the ASM-135 test package.  Major Wilbert D. Pearson was at the controls of the Celestial Eagle.

Flying over the Pacific Ocean at Mach 1.22, Pearson executed a 3.8-g pull to achieve a 65-degree inertial pitch angle in a zoom climb.  As the aircraft passed through 38,000-feet at Mach 0.93, the ASM-135 was launched at a point 200 miles west of Vandenberg.  Both stages fired properly and the MHV intercepted the Solwind P78-1 satellite within 6-inches of the aim point.  The 2,000-lb satellite was obliterated.

In the aftermath of the stunningly successful takedown of the Solwind P78-1 satellite, USAF was primed to continue testing the ASM-135 and then introduce it into the inventory.  Plans called for upwards of 112 ASM-135 rounds to be flown on F-15A aircraft stationed at McChord AFB in Washington state and Langley AFB in Virginia.  However, such was not to be.

Even before the vehicle flew, the United States Congress acted to increasingly restrict the ASM-135 effort.  A ban on using the ASM-135 against a space target was put into effect in December 1985.  Although USAF actually conducted successful additional ASM-135 flight tests against celestial virtual targets in 1986, the death knell for the program had been sounded.

In the final analysis, a combination of US-Soviet treaty concerns, tepid USAF support and escalating costs killed the ASM-135 anti-satellite effort.  The Reagan Administration formally cancelled the program in 1988. 

While the ASM-135 effort was relatively short-lived, the technology that it spawned has propagated to similar applications.  Indeed, today’s premier exoatmospheric hit-to-kill interceptor, the United States Navy SM-3 Block IA anti-ballistic missile, is a beneficiary of ASM-135 homing guidance, intercept trajectory and kinetic kill technologies.

Posted in Aerospace, History

Comments

John Hackman August 13, 2013

J. Terry White,
I was there at Ridley Mission Control at E.A.F.B. on Friday September the 13th 1985. I came in at midnight to prep the missile for transport to the F-15 hanger. Left E.A.F.B. at 4:30 the next afternoon. I worked for two years for LTV on the upper stage before being picked up by Boeing. Spent the rest of my career with them. But in all I spent 4 years on ASAT plus the time to pack everything up and ship it off after the program was cut. Guess you could say I “turned out the lights”.

I have an original picture of the one at the top of this page and another showing the lower SRAM stage igniting. Both signed by Major Doug Pearson.

I’m retired now and some of the old guys along with myself were trying to remember the lead test engineer for Boeing on ASAT at E.A.F.B. at that time. Would you happen to know this fellas name?

I also found it funny a couple of years ago when the U.S. Navy launched an ASAT missile at that satellite that was falling to earth and said something like that had never been tried before. The Navy wanted a sea launched version of the ASAT missile but of course the program was cut.

At the time it was cut we were told that it pissed the Russians off so bad because of the advanced technology within the “MV”. Miniature Vehicle. This was the kinetic kill device on the very tip of the missile as I’m sure you know.

If you can help with that name it sure would shut up a bunch of grumpy old men.

Sincerely,

John Hackman

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