Ummites: The People of Ummo

The Ummo affair began in Madrid in 1966, when a contactee-circle organizer named Fernando Sesma Manzano started receiving long typewritten letters and photographs that claimed to come from a spacefaring people, the Ummites, of the planet Ummo. What grew out of that first delivery became one of the largest documentary hoax corpora in the history of European ufology.

Sesma was no random recipient. A Spanish postal-service employee, he had already founded a Madrid contactee organization, Los Amigos de los Visitantes del Espacio (Friends of Space Visitors), back in 1954, more than a decade before the first Ummo letter reached him. The receptive circle was already built. The hoax simply walked into a room that had been waiting for it.

On February 6, 1966, roughly half a dozen witnesses near the Madrid suburb of Aluche reported a landed, three-legged saucer-shaped craft about 33 feet across, marked with a distinctive emblem: three vertical bars joined by a single horizontal line. Among the witnesses was José Luis Jordán Peña, who would later admit that he staged the whole scene.

Sixteen months on, on June 1, 1967, four photographs surfaced of an alleged Ummite craft bearing that same emblem, taken over San José de Valderas in Alcorcón. The photographer was again Jordán Peña, and he later admitted the 'craft' was a small model suspended on a wire. The most reproduced images in the entire case were, by the confessor's own account, a toy and a thread.

The correspondence, mostly in Spanish with some letters in French and other languages, eventually ran to well over a thousand typed pages. It claimed to originate with the Ummites of the planet Ummo, orbiting a star the authors called Iumma and tentatively identified with Wolf 424, a real star in the constellation Virgo. Crucially, the letters treat Iumma as a single sun.

Wolf 424 is genuine, and that is exactly the problem. It is a nearby red-dwarf binary system (components Wolf 424 A and B), roughly 14.3 to 14.4 light-years away in Virgo, and its close-binary nature was established by the astronomer Dirk Reuyl in 1941. The hoax borrowed a real object out of the astronomy of its day, then described it wrong.

Critics have singled that mistake out as a tell against extraterrestrial authorship. If the Ummites truly lived on a planet in the Wolf 424 system, they would grow up under two suns and would surely say so. The letters speak of only one. A civilization cannot misremember how many stars it orbits. A human author working from a 1960s star catalog easily can.

The letters also backdated the visit. They claimed the Ummites first landed on Earth covertly near Digne-les-Bains, in the Alpes-de-Haute-Provence region of southern France, in March 1950, sixteen years before the Madrid contacts began. There is no evidence for this at all beyond the letters that assert it.

The corpus grew to a scale unusual for a hoax. A 1988 letter referenced roughly 3,850 pages already in circulation, and some researcher estimates for the total theoretical output run as high as 160,000 pages. But only about 1,300 pages have actually been catalogued and verified by independent researchers. The larger totals rest on single, uncorroborated figures, and should be read as claims, not counts.

Believers took the apparatus seriously enough to build a whole constructed language out of it. Antonio Ribera catalogued about 403 Ummite words in 1978, and Jean Pollion's 2002 book Ummo, de vrais extraterrestres listed over 1,000. These are real publications, and they document how elaborate the internal machinery of the hoax became. They are evidence of craftsmanship, not of an alien tongue.

In 1993, José Luis Jordán Peña (1931 to 2014), a Spanish telecommunications technician and former science teacher who also described himself as a psychologist and a onetime vice-president of the Spanish Society for Parapsychology, published a confession. Titled UMMO Special: el otro mito que hace crash ('UMMO Special: the other myth that crashed'), it ran in issue 29 of the rationalist magazine La Alternativa Racional, and in it he admitted that he had authored the Ummo letters and staged both the Aluche and Valderas sightings.

He gave a motive, too, and it was chilling in its own quiet way. Jordán Peña described the whole thing as a deliberate 'psychosociological experiment': a test of how far otherwise rational, credentialed people, scientists and military officers and journalists among them, could be drawn into sustained belief in a fabricated extraordinary claim. He said he had even manufactured physical props for it, including plastic fragments passed off as advanced alien material.

One faction of longtime researchers has never accepted the confession as the whole truth. Their argument is that a single non-specialist could not plausibly have written the letters' more technical passages on cosmology and genetics on his own, and that Jordán Peña may therefore have fronted for a larger group, or simply overstated his own role. It is an argument from incredulity, unproven, but it is the reason the case never quite closed.

The confession's most prominent holdout is the French physicist Jean-Pierre Petit, a CNRS researcher. Despite Peña's 1993 statement, Petit said on French television in the 1990s that some of his own ideas in cosmology and magnetohydrodynamics had been inspired by material in the Ummo letters, and in 2018 he described personal 'contact' experiences that he linked to the case. It is a striking endorsement from a credentialed scientist, and it rests, so far, on his testimony alone.

Small devotee groups reportedly persisted for decades after 1993, including one nicknamed 'the Daughters of Ummo' in Bolivia. The detail gets repeated across secondary sources, but it has not been independently documented in any depth, so we hold it loosely.

The independent analysts who studied the letters before the confession reached the same verdict. Ufologist Jacques Vallée, in Revelations: Alien Contact and Human Deception (1991), and researcher Mike Dash, in Borderlands (2000), both judged the scientific content to be, in Vallée's phrase, 'knowledgeable but unremarkable': plausible for the 1960s but visibly dated by the 1990s, exactly what you would expect from a well-read human author and not from an advanced civilization.

Beyond the confession, researchers have floated rival origin theories, none of them proven. Vallée raised the possibility of a Cold War intelligence operation, a disinformation effort tied to flushing out Western sympathizers of the dissident Soviet physicist Andrei Sakharov. Dash suggested some of the material may have worked as coded anti-Franco dissent, circulated under Spain's censorship regime. Both are speculation about a hoax whose author has already claimed sole authorship.