Joint Assault Gold Ace No Ribbon
For the asteroid in the Infinity universe, see 1986VG1 Ulysses.
ACE04 Ulysses Fragment

A fragment of Ulysses, observed from the ground, entering the atmosphere in July 1999

"Every now and then, I'd tell my daughter the story of the night some years ago, a night when the sky was radiant with shooting stars."
Melissa Herman[1]

Ulysses 1994XF04 (1994XF04ユリシーズ),[2] commonly referred to as Ulysses, was a Strangereal asteroid approximately 1.6 kilometers in diameter. It was the catalyst to the Ulysses Impact Event[3] in 1999.

Researchers at the Seals Bridge University first discovered Ulysses in October 1994. Subsequent research from the Comona Islands predicted the asteroid would collide with Strangereal's Earth in July 1999. The announcement sent Earth's countries into a panic and sparked a large development of shelters. Usea and Anea were the two continents predicted to suffer the most damage, resulting in mass migrations to other parts of the world. Usean countries developed the Stonehenge railgun network to combat Ulysses; on Anea, Estovakia attempted to develop the Chandelier railgun but could not complete it in time.

Ulysses made impact as predicted in July 1999. In a few weeks, over half a million human lives were lost; Usea and Estovakia's infrastructure collapsed; and a widespread humanitarian crisis quickly developed as refugees lost their homes. The political instability from the impacts would last years and inevitably result in the Continental War on Usea and the Estovakian Civil War on Anea.



Researchers from Usea's International Astronomical Union (IAU) at Seals Bridge University discovered Ulysses in October 1994. Researches at Comona University used computer models to calculate the asteroid's trajectory; by December 1994, they confirmed that Ulysses would pass through Earth's Roche limit on July 3, 1999 at 3:30 PM Usea Eastern Standard Time. It would then shatter into numerous fragments and bombard the northern hemisphere with the force of two million nuclear warheads; the atmosphere debris generated by the event would plunge the affected areas into a nuclear winter.[2] July 3, 1999 was known from then on as "Ulysses Day".[4]

The IAU reported its findings to the Federation of Central Usea (FCU) government. The FCU withheld the impact confirmation from the public "due to political and cultural considerations" and called an aerospace conference to decide how to prevent the impending disaster. The conference ended in a clear consensus that the FCU would have to cooperate with its allies to combat the asteroid.[2]

Defense efforts

Usea Today - Ulysses Crisis Page

Edition of Usea Today concerning the Ulysses announcement

"This is an impending disaster, not only for Usea, but the entire world. ... We must take every means so that we may live to see the new millennium."
― FCU President Robert Sinclair[2]

On April 20, 1996, the FCU's serving president, Robert Sinclair, disclosed the existence and impending impact of Ulysses in an historic press conference, generating considerable shock and panic around the world. Later that day, FCU Secretary of State Stateson attended an emergency meeting of the Committee of Foreign Affairs at the Central Usea Treaty Organization (UTO) headquarters.[5] During the meeting, Stateson proposed the creation of a "National Missile Defense" (NMD) system between UTO members.[5] Alternatives to the NMD included a partially completed satellite-borne anti-asteroid laser system.[6] Despite initial hesitations stemming from the NMD's potential use as a weapon of war, it was ultimately chosen by the committee as the most viable option.[5]

However, the NMD plan was eventually scrapped in favor of the FCU's "Defense Initiative", internally known as "Project STN" (Spaceguard Turret Network[7]). The plan proposed an array of railgun cannons, known as Stonehenge, which was ultimately built through an international collaborative effort.[8] In addition to Stonehenge, other planetary defense systems were built within Usea to destroy Ulysses, including North Point's Fortress Intolerance.[6]

Final months

The Stonehenge complex, envisioned as the "defender of the continent", was completed in June 1998; the turrets were completed several months later. Both Osea and Yuktobania initially expressed willingness to collaborate on its construction, but were unable to participate due to reconstruction efforts from the 1995 Belkan War.[9]

In that same month, gravitational analyses obtained by an IAU space probe revealed that Ulysses had a hollow interior. Recalculations performed by the international scientific team concluded that the asteroid's fragments would impact a much larger area of the planet's surface than had been originally predicted. However, the STN project had progressed beyond the point at which further modifications to the weapon's capabilities could be made. Prior to the IAU's revised report, it was believed that the weapon's range of 1,200 kilometers would provide sufficient coverage for Usea; it now became clear that areas of the planet between meridian lines 135 degrees east and 30 degrees west would be hit. This brought the continent of Anea in range of Ulysses's impact.[10]

STN Overhead

The Stonehenge Turret Network facility

After the news of Ulysses's projected range was made public, the FCU opted to make Stonehenge more reliable for its allies and refused to make additional revisions to the weapon's range. This decision left Anea completely unprotected and sparked continent-wide protests at the perceived lack of crisis management efforts.[10] At the suggestion of Lord Alberto Lawrence, the Emmerian government began evacuating areas that were most likely to be hit and constructed a network of underground shelters in and around the nation's capital, Gracemeria, capable of housing 200,000 individuals. As a result, Emmeria was well equipped to handle the aftermath of Ulysses, and Gracemeria became one of the primary relocation sites for Anean refugees.[4] In the meantime, Estovakia constructed its own defensive weapon, the Chandelier railgun, to defend against Ulysses; however, it was not completed in time.[11]

In Usea, the UTO announced its intentions to shelter refugees in each UTO-member nation. Around the world, governmental and private-sector organizations made extensive preparations concerning food and medical supplies, evacuation drills, humanitarian outreach, and disaster relief in anticipation of the impact.[12]


Ulysses from Gracemeria

Fragments of Ulysses over Gracemeria, Emmeria

On July 3, 1999, Ulysses passed through Earth's Roche limit as predicted. The asteroid would spend the next five days shattering into thousands of fragments; on July 8, the fragments began to hit the planet. The majority of fragments fell to Earth over the next two weeks.[13] Stonehenge successfully intercepted a large number of them, preventing mass extinction; however, it failed to completely protect the continent. Some urban areas—such as Comberth Harbor, Anchorhead, and Saint Ark—were unharmed, while other areas—such as Newfield Island and Farbanti, Erusea—suffered impacts that radically altered their geography and devastated the local populations.[14]

Approximately 500,000 people were killed in the initial two-week planetfall period,[13][15] and at least one million more were displaced as refugees.[16] Economists estimate that the damage inflicted was equivalent to 18 months-worth of the Usean continent's total GDP.[15] Around the world, however, certain nations were more affected by Ulysses than others (e.g. fragments that struck Anea heavily damaged Estovakia, while neighboring Emmeria remained relatively unharmed[1]).


The Ulysses's planetfall triggered many changes and upheavals within the nations of the world and had a profound effect on the global population. The event became the catalyst for a number of crises and military conflicts within Usea and Anea, leaving a lasting legacy which spans nearly 20 years. The anniversary of Ulysses Day[4] is likely observed as a day of thanksgiving and solemn remembrance of the innocent lives lost.

Northern hemisphere

Estovakian City Following Ulysses

A destroyed Estovakian city

Following the impacts, Usea was inundated with millions of civilian refugees, which led the UTO to initiate a quota-based refugee relocation effort. Erusea, which had suffered thousands of casualties, responded by restricting its issuing of visas to refugees, preventing their entry into the country. Makeshift camps appeared along the Erusean borders, exacerbating the humanitarian crisis in western Usea.[16] The heated dispute between Erusea and the FCU-backed UTO eventually culminated in Erusea's armed takeover of the Stonehenge railgun facility, triggering the Continental War.[17]

On the Anean continent, Estovakia was one of the countries most adversely affected by Ulysses, suffering widespread destruction and leaving its economy in shambles. The fall of the nation's infrastructure led to a prolonged civil war waged between infighting factions, which only ended when these groups were forcibly united under a junta of top military officers known as "The Generals". As with Usea, the junta declared war on neighboring Emmeria in August 2015.[18]

Osea and Yuktobania

In the years following Ulysses, minor fragments continued to linger in low orbit and fall onto the planet. The elimination of these remnants was rendered impossible by the destruction of Usea's STN facility, and later the Megalith facility as well, during the Continental War. The issue was brought up during the 2008 G7 Summit held aboard the Osean Federation's Arkbird spacecraft, where it was decided that the ship would be used to clean up the debris left by Ulysses.[19]

After the summit, the Arkbird was equipped with weapons built through the joint efforts of Osea and Yuktobania. The maneuverable space vessel was outfitted with Yuktobanian pulse-laser guns for smaller fragments, and an Osean beam laser system and missile launchers for large fragments. Though this was not a perfect solution—it required shattering the fragments into even smaller ones that occasionally survived passing through the atmosphere—the Arkbird successfully cleared 80% of debris around the planet's lower orbits. This led to renewed interest in the construction of an international space station, a project which was sponsored in large part by Osea and Yuktobania.[19]


The fragments of Ulysses produced several craters across the Earth's surface. Many of the most well known impact sites are located in the northern hemisphere—whether Ulysses fragments have significantly impacted the rest of the world, however, is uncertain.


Anderson Crater

Located south of North Point, the impact that formed Anderson Crater obliterated a large area of Newfield Island's eastern face. In the years after Ulysses, plans were put forward to restore the crater area, though these efforts were hampered by the Usean Geological Survey Society's protests and the Continental War's outbreak.[20][21]

Krasinsky Crater

Officially named after Usean astronomer Dr. Romanov Krasinsky,[20] this 1.7-kilometer[20] wide impact site is located at Mount Shezna. The residual heat from the impact melts the snowfall within the crater, which generates billowing white columns of steam in the frigid northern climate.[20][22]

Mackenzie Crater

Due to its location in the arid Faith Park region, researchers believe that the crater will remain virtually unchanged for thousands of years.[20]

Goldberg Crater

Found in the desert terrain of the Whiskey Corridor, it is one of the largest craters created by Ulysses with a diameter of 8.4 kilometers.[20] The force of the collision redirected the flow of water from the Irsali River,[20] causing Old Anchor Point City's port to dry up and become a graveyard of stranded ships.[23]

Ryker Crater

One of the deadliest recorded impacts, a Ulysses fragment decimated the coastal area of Farbanti, killing thousands and flooding the site with seawater. Despite the catastrophe, the Erusean government and many of the city's inhabitants remained there in the aftermath.[20][24]

Newman Crater

Located on Fort Grays Island.[25]

Unnamed crater in Chopinburg Rainforest[26]

Unnamed crater in Roca Roja[27]


Antenora Crater

Located on Sonne Island in northern Estovakia, the impact that formed this crater occurred in the vicinity of the Chandelier.[11]



  • Ulysses is named after the Roman name for the Greek epic hero Odysseus, the protagonist of Homer's Odyssey.
  • The "1994XF04" designation may be based on the minor planet naming conventions used by the real-life International Astronomical Union. If the IAU's naming conventions were used, then:
    • "1994" is the year of its discovery;
    • "X" means it was discovered between December 1–15 (the first half of the month); this is incorrect, since the asteroid was discovered in October and not December, meaning "X" should have been either "T" or "U"; and
    • "F04" (if read as F4) indicates it was the 106th asteroid discovered in that half-month.


  1. 1.0 1.1 Cutscene 02, Ace Combat 6: Fires of Liberation.
  2. 2.0 2.1 2.2 2.3 Asteroid On Collision Course With Earth.
  3. Aces At War: A History 2019, page 97.
  4. 4.0 4.1 4.2 "A Shelterized Castle", GAZE: Last Christmas. Retrieved January 8, 2017.
  5. 5.0 5.1 5.2 "Secretary Of State Expresses Support For NMD Proposal", Usea Today: Asteroid on Collision Course With Earth!. Retrieved December 28, 2016.
  6. 6.0 6.1 Ace Combat: Assault Horizon Legacy.
  7. Hasegawa 1/72 "F-22A ACE COMBAT Mobius 1" (plastic model) description.
  8. "Introduction", Our Science: Titan Guns. Retrieved December 30, 2016.
  9. Aces At War: A History, page 136.
  10. 10.0 10.1 "Wider Damage Range than Estimated", GAZE: Last Christmas. Retrieved January 8, 2017.
  11. 11.0 11.1 Chandelier, Ace Combat 6: Fires of Liberation.
  12. "The World in Unison with Emmeria", GAZE: Last Christmas. Retrieved January 8, 2017.
  13. 13.0 13.1 Ace Combat 04: Shattered Skies - Perfect Guide, page 007.
  14. Ace Combat 04: Shattered Skies.
  15. 15.0 15.1 World / Asteroid Ulysses Enters the Atmosphere, AC04Web. Published 2001. Retrieved January 30, 2017.
  16. 16.0 16.1 "Friction Comes to the Surface of the Refugee Problem", GAZE: War? Retrieved January 8, 2017.
  17. "The Rash Act of Erusia", GAZE: War? Retrieved January 8, 2017.
  18. Ace Combat 6: Fires of Liberation.
  19. 19.0 19.1 "Ark After Stonehenge", GAZE: Arkbird Declaration Summit 2008. Retrieved January 8, 2017.
  20. 20.0 20.1 20.2 20.3 20.4 20.5 20.6 20.7 Color of the World: Craters. Retrieved July 2, 2018.
  21. Sitting Duck, Ace Combat 04: Shattered Skies.
  22. The Northern Eye, Ace Combat 04: Shattered Skies.
  23. Whiskey Corridor, Ace Combat 04: Shattered Skies.
  24. Siege of Farbanti, Ace Combat 04: Shattered Skies.
  25. VR Demo, Ace Combat 7: Skies Unknown.
  26. "Two-pronged Strategy", Ace Combat 7: Skies Unknown.
  27. "Long Day", Ace Combat 7: Skies Unknown.

Start a Discussion Discussions about Ulysses 1994XF04

  • Ulysses intel on the AC 4 training book

    4 messages
    • Hang on, is this the French manual for ''Ace Combat: Distant Thunder'', or is this from a book about more than just Ace Combat?
    • French manual , i have never see this manual in another language .  It is pretty strange to the translator have do this kind of mistake . I ...
  • I Guess Shoemaker–Levy 9 is a source of inspiration for Ulysses 1994XF04

    5 messages
    • Why the info about ulysses size and the ffect on stonehenge are different here ? The Book of tutorial on AC 4 give different data .
    • What different data are you referring to? And are you talking about Comet Shoemaker–Levy 9? Otherwise, this is off-topic from this discussio...