November 15, 2022

One Year After Russian ASAT Test: What Has Changed?

A year has passed since Seradata, a Slingshot Aerospace company, and Numerica Space (now part of Slingshot Aerospace) broke the news to the world that Russia had destroyed one of its satellites in low Earth orbit (LEO). So, what happened then, and what has happened since this destructive anti-satellite (ASAT) test?

A year has passed since Seradata, a Slingshot Aerospace company, and Numerica Space (now part of Slingshot Aerospace) broke the news to the world that Russia had destroyed one of its own satellites in low Earth orbit (LEO). So, what happened then, and what has happened since this destructive anti-satellite (ASAT) test?

Around 0246 GMT on 15 November 2021, a Russian A-235/PL-19 Nudol missile, was launched from Plesetsk in Northern Russia. Approximately five minutes later, the missile intercepted a defunct Soviet-era satellite known as Cosmos 1408. 


A-235/PL-19 Nudol missile launch. Courtesy: Russian Ministry of Defence via

Cosmos 1408 was a 2,000 kg Tselina-D class signals intelligence satellite, launched in 1982, which had been out of service for several decades. When the satellite was struck it exploded causing a “debris cloud” that threatened other spacecraft including the International Space Station (ISS).

A few hours after impact the United States State Department confirmed that an ASAT test had taken place and that an alert had been sent to the American, German, and Russian crew onboard the ISS. 

This “safe haven” protocol alarm procedure was activated at 0900 GMT on the ISS. The seven crew members aboard were instructed to don their space suits, shelter in their spacecraft (Crew Dragon Endurance and Soyuz MS-19) and prepare for possible evacuation should the ISS be struck. They remained in these shelters for approximately six hours before getting an all-clear to return to normal activities.


Image generated by Slingshot Laboratory of predicted position based on TLE with 11/13/21 Epoch.  (

It was the relative proximity of the orbits and the short warning that caused particular concern. The ISS’s orbit was close enough to the debris field to potentially experience a conjunction threat every 93 minutes with the wreckage generated by the ASAT test.

The creation of the respective debris cloud caused international protest. NASA Administrator Bill Nelson said: “I’m outraged by this irresponsible and destabilizing action. With its long and storied history in human spaceflight, it is unthinkable that Russia would endanger not only the American and international partner astronauts on the ISS, but also their own cosmonauts. Their actions are reckless and dangerous, threatening, as well, [to] the Chinese space station and the taikonauts on board.”

The initial emergency for the ISS crew was not the only one the crew members faced. The ISS maneuvers infrequently, on average once a year, to avoid space debris. Since the ASAT in November 2021, the ISS has had to maneuver multiple times to dodge the Cosmos 1408 debris. Most recently, on 25 October 2022, the docked Progress MS-20 (Progress 81P) cargo spacecraft had to fire its thrusters for 5 minutes and 5 seconds in a Predetermined Debris Avoidance Maneuver (PDAM). This was to drive the spacecraft and the attached ISS complex an extra measure of distance away from the predicted track of a fragment of Cosmos 1408 debris.

In addition to the ISS, other spacecraft have had several close encounters with Cosmos debris. According to data from Slingshot Beacon, the event has generated 2,587,750 conjunction data messages (CDMs), meaning there have been more than 2.5 million proximity alerts that operators have had to evaluate from this one debris-generating event. 


Debris Cloud Remains with Us

Simulation created in Slingshot Laboratory showing how the International Space Station (ISS) crosses through the path of Cosmos 1408’s ASAT interception debris.

According to, one month after the interception, 500 pieces of debris had been tracked, a total that later rose to nearly 1,800 pieces. 

Based on the TLE data available on, before impact and first available after impact days later, the main Cosmos 1408 body was likely impacted from behind because the resulting fragment’s orbital energy was of larger magnitude after the collision. Although this would suggest the relative velocity of the two objects at impact would be lower, this type of collision could be considered more perilous in the sense the resulting debris would remain in orbit for years and, potentially, more than a decade, due to the increase in orbital energy magnitude. Additionally, the steeper geometry of the collision dispersed the resulting fragments - at higher velocities - in wider spread.

Whichever way the debris gets there, the concern remains that some orbits are now becoming increasingly populated with spacecraft – especially those used by the large satellite constellations – and that any debris intersecting respective orbits of these constellations might one day result in a chain reaction of cascading debris formation, potentially causing the “Kessler Syndrome” theory posed by Donald Kessler in 1978.

As it is, with so much space junk and live satellites already in these orbits, adding more debris further aggravates the problem. Without a clear global space traffic coordination solution geared towards this level of scale (like Slingshot Beacon), space sustainability faces a serious threat.


How Seradata and Slingshot Discovered the ASAT Test


Slingshot received early news of the ASAT missile launch through the Slingshot Global Sensor Network, which had been monitoring Cosmos 1408. The telescope system in Morocco detected the debris cloud within a few hours of impact. With this early detection, Slingshot was able to release the first images of the aftermath of the collision (above). The images showed that the debris was rapidly moving away from a point of origin within a few hours of the impact. These first images also indicated that some of the larger pieces were breaking apart in the process, creating even more debris.

Additionally, at the time, the space industry’s leading launch and satellite database provider, Seradata (now a Slingshot Aerospace company) was involved in a SACT (Sprint Advanced Concept Training) exercise. SACT is a way for the United States and its allies to technically assess commercial space domain awareness capabilities. It does this via global exercises based on real and simulated space events. Real world events are included in the exercise and sometimes they can dominate, which was the case on 15 November 2021. Because of this exercise, Seradata was the first to break the news to the world via Twitter.


The History of Direct Ascent ASAT Missile Tests

ASAT missile tests have been carried out since the late 1950s. The first successful close pass was made by a B-47 Stratojet air-launched Bold Orion/Altair missile attempting to intercept Explorer 6 on 13 October 1959.  

It was realized, given the 6.4 km pass distance, that a nuclear warhead would have been needed to reach the spacecraft and put it out of action. Exploding nuclear weapons in space to cause damage was explored as a secondary effect of the Starfish Prime. On 9 July 1962, the United States Air Force detonated Starfish Prime, the highest space nuclear test ever conducted. The effects of the test created an artificial solar storm that included auroras (seen in the sky from Hawaii to Tonga to Somoa), geomagnetic activity, and damaged electric systems up to 800 miles away from the explosion. Six satellites were reportedly damaged.

Air-launched missiles gave way to other methods with the Soviet Union. In 1968, the Soviets began testing explosive “killer satellite” technology. The testing stopped when the Soviets declared the first official moratorium on ASAT testing. Yet, two years later, in 1985 when the United States was preparing to launch their first ASAT, the Soviets “considered themselves free” to lift their two-year-old moratorium on ASAT weapons.

The return to air-launched ASATs happened with an F-15A Eagle fighter jet launch of the Vought ASM-135A missile, which successfully intercepted Solwind P78-1, a US gamma ray spectroscopy satellite, at an altitude of 530 km on 13 September 1985. Hundreds of pieces of tracked debris were detected, all of which quickly decayed. Rather than an explosive warhead, the missile used an infrared guided direct interception technique controlled by a solid rocket thruster. While the test was successful, the United States turned away from ASATs and instead concentrated its efforts on directed energy beam weaponry.

More recently, as inspection and service satellite technology have matured, China has been developing satellites not to service and repair spacecraft, but to conduct remote operations to physically attach to and manipulate other satellites.

China decided that it needed to demonstrate a direct interception capability of its own. On 11 January 2007, it used a ground-launched SC-19 missile as an interceptor to strike the Chinese Fengyun-1C weather spacecraft at an altitude of 863 km. The resulting debris was found to have more than 3,000 tracked pieces, the majority of which still remains in orbit. The debris cloud triggered international protest over the test. Apart from the space debris risk, the military implication was that any satellites flying in a sun-synchronous orbit – as most reconnaissance satellites do – were now at risk of missile strike. 

On 20 February 2008, as part of Operation Burnt Frost, a United States Navy Standard Missile-3 (SM-3) missile was fired from the USS Lake Erie. The mission was quickly designed to destroy a non-operational orbitally decaying United States National Reconnaissance Office satellite, USA-193, to stop its stainless-steel tank of hydrazine fuel from surviving re-entry, which was a threat to human life. The SM-3 missile intercepted the satellite USA-193 at 220 km altitude, causing it to break up. It was known from the start that the debris would re-enter and burn up within a short time period, and would not create a lingering debris field. The final piece of detectable USA-193 debris re-entered on 28 October 2009.

Images showing explosive SM-3 “Burnt Frost” interception of USA-193. Courtesy: US MDA

India performed its first ASAT missile test on 27 March 2019 when it used a PDV-Mk 2 missile to destroy its Microsat-R satellite in orbit at an altitude of 285 km, causing 400 pieces of tracked debris. All have now re-entered.

As previously discussed, Russia returned to ASAT missile technology on 15 November 2021 when its Nudol missile struck the Cosmos 1408 spacecraft at an altitude of 470 km, causing 1,789 pieces of tracked debris, some of which are likely to last at least 15 years in orbit.

Table 1: Five successful ASAT missile test interceptions to date



ASAT System


Intercept Alt (km)

Target Launch Mass (kg)

Tracked Debris

Debris still in orbit

Total Debris Lifespan (Years)

13 Sep 1985



Solwind P78-1






11 Jan 2007



Fengyun 1C





15+ est

20 Feb 2008



USA 193






27 Mar 2019









15 Nov 2021


A-235/PL-19 Nudol

Cosmos 1408





15+ est

Sources: Secure World Alliance/NASA/Seradata SpaceTrak/Space-Track.Org as of 10 November 2022


Where is the Debris One Year After the Russian ASAT Test? 

As of 23 October 2022, there were 1,789 pieces of tracked debris from the Russian ASAT interception of Cosmos 1408, of which 439 pieces are still in orbit (as of 10 November 2022).

The Gabbard diagram, which shows the apogee and perigee of Cosmos 1408 and the resulting debris, indicates that the apogees of some parts were boosted all the way up to 700 km, with one piece close to 800 km. Some pieces were sent downwards with perigees now significantly below the interception altitude of 470 km, and some debris were close enough to present a potential conjunction threat to the ISS.

Space object decay prediction is an inexact science with several variables, not least the solar weather effect on the thickness of the Earth’s atmosphere. Nevertheless, a rough assessment is possible using data from the earlier ASM-135A test at a similar altitude. We can, therefore, predict that debris from the Russian test is expected to last in orbit for approximately 15-20 years.


A Gabbard diagram shows the apogee (orange) and perigee (blue) of the debris pieces from the Cosmos 1408 ASAT interception. Data sourced from


Putting an End to ASAT Tests

As it stands, only four nations have demonstrated a direct ascent ASAT capability: China, India, the United States and Russia. While the environment surrounding the use of these weapons has many unknowns it stands to reason that their use, if carried out against a spacecraft from another country, would have a high likelihood of being regarded as a Casus Belli “act of war” by the receiving party.  

U.S. Vice President Kamala Harris announced in April 2022 that the United States has committed to not conduct destructive, direct-ascent anti-satellite (ASAT) missile testing, and called on other nations to do the same. “Through this new commitment and other actions, the United States will demonstrate how space activities can be conducted in a responsible, peaceful, and sustainable manner,” she said.

Several other countries have made similar commitments including Canada, New Zealand, Germany, the United Kingdom, Japan, Australia, South Korea, and Switzerland.

Furthermore, the United Nations is concerned about ASAT testing and is moving towards establishing a new set of rules and norms for responsible behavior in space. 

In the Fall of 2022 the U.N. First Committee voted on a resolution from the United States to forgo the testing of destructive, debris-creating anti-satellite weapons. 154 countries voted in favor of the resolution, with 10 abstaining and eight opposing including permanent Security Council Members, China and Russia. While this is not a legally binding commitment it is a strong indication of the global interest in restricting the use of such weapons, as well as the work yet to be done to gain international consensus on this topic. 


Conclusion: Working Together to Keep Space Safe

Creating more space debris is not in any nation’s best interest - since a chain reaction of conflict could quickly render the space domain unusable for humankind. We must push to accelerate work already underway at both international organizations and the national level to ensure a global ban on destructive, debris-causing, ASAT tests.

We must also increase accountability for safe space operations in the orbital environment. Initiatives like the Space Sustainability Rating are taking the global community in the right direction by challenging space operators to be held to the highest standards of stewardship, but there is still much more to be done. 

Today, our highly skilled team at Slingshot Aerospace is developing and deploying cutting edge technologies like Slingshot Beacon, Slingshot Digital Space Twin™, and the Slingshot Global Sensor Network. These products provide space operators with actionable insights and complete data, so that when faced with the consequences of dangerous or reckless behavior on orbit, such as ASAT tests, they’re able to rapidly and confidently make critical decisions to ensure safety of their operations and of the space operating domain as a whole.

ASAT tests, and the debris they create, are not just a threat to a single satellite — they are a threat to humanity’s future. At Slingshot Aerospace, we are steadfast in our commitment to accelerating space sustainability and will continue to strongly denounce ASAT tests and other behaviors that endanger the sustainability of our planet and the orbits we all depend on.