Faith and rigorous science are not adversaries but companions
Across the centuries, the Catholic Church has sought to demonstrate that the life of faith and the life of inquiry need not be strangers to one another. In late April 2026, the Vatican Observatory gave that conviction a celestial address: four asteroids, discovered by Lithuanian and Vatican astronomers using a telescope on an Arizona mountaintop, were formally named for figures who shaped the Observatory's long history — chief among them Pope Leo XIII, whose baptismal name Gioacchino Pecci now travels the asteroid belt as a permanent designation. The gesture honors not only individuals but an institution built on the conviction that gazing at the heavens is itself a form of devotion.
- A centuries-old tension between religious authority and scientific inquiry finds a quiet but pointed resolution as the Church writes its own astronomers into the permanent record of the cosmos.
- Four asteroids — including one bearing the baptismal name of the pope who rebuilt the Observatory after territorial losses stripped it of its instruments — received official International Astronomical Union designations in April 2026.
- The discoveries were made using the Vatican Advanced Technology Telescope in Arizona, a facility born of necessity after light pollution twice forced the Observatory to abandon its Roman and then its Castel Gandolfo homes.
- The three additional honorees — a 19th-century Deputy Director, a cardinal-administrator, and a Belgian Jesuit who pioneered digital astronomy — trace the full arc of an institution that has quietly contributed to stellar cartography, galactic research, and light pollution science.
- The naming lands as both tribute and argument: that the Observatory Leo XIII re-founded to answer charges of anti-intellectualism has, over more than a century, made the case not in words but in data.
On April 29, 2026, the Vatican Observatory announced that four asteroids would carry the names of figures central to its own history. The most prominent honor belongs to Pope Leo XIII — the pontiff who, in 1891, rebuilt the Observatory after the Church lost the territorial holdings that had housed its astronomical instruments. His baptismal name, Gioacchino Pecci, now identifies asteroid (858334) Gioacchinopecci.
The asteroids were discovered by Lithuanian astronomer Kazimieras Černis and Vatican Observatory astronomer Father Richard P. Boyle, working with the Vatican Advanced Technology Telescope on Mount Graham in Arizona. Their findings were formally registered in the International Astronomical Union's nomenclature bulletin in April. The three other honorees span generations of the Observatory's work: Father Giuseppe Lais, who served thirty years as Deputy Director in the 19th century; Cardinal Pietro Maffi, who led the institution from 1904 until his death in 1931; and Father Florent Bertiau, a Belgian Jesuit who founded the Observatory's Computer Centre in 1965 and pioneered digital analysis of astronomical data.
Leo XIII's 1891 founding document framed the Observatory as a direct answer to critics who accused the Church of hostility toward science. He wrote that the Church's posture toward "true and solid science" was to embrace and promote it — and that astronomy itself was a discipline that "raises the spirit of mortals to the contemplation of heavenly events."
The Observatory's physical history mirrors the Church's shifting circumstances. From Rome's city center, it moved to Castel Gandolfo as electric light dimmed the capital's skies, then eventually to Arizona as suburban expansion dimmed those skies too. The Vatican Advanced Technology Telescope, built in the 1990s, has since become the institution's primary research instrument — and the source of these latest discoveries.
This is not the first time the Observatory's story has been inscribed in the sky. Asteroid (8661) Ratzinger honors the future Pope Benedict XVI for his role in opening Vatican archives on Galileo, and (560974) Ugoboncompagni commemorates Pope Gregory XIII's calendar reforms. The four new names extend that tradition — affirming, in the language of orbital mechanics and permanent designation, that faith and rigorous inquiry have long kept company at the edges of the known universe.
On Wednesday, April 29th, the Vatican Observatory announced that four asteroids discovered in recent years would bear the names of figures central to its own history. The largest honor went to Pope Leo XIII, whose baptismal name, Gioacchino Pecci, now identifies asteroid (858334) Gioacchinopecci. It was Leo XIII who, in 1891, resurrected the Observatory after the Church had lost the territorial holdings that once housed its most productive astronomical instruments.
The four asteroids were found by Lithuanian astronomer Kazimieras Černis and Father Richard P. Boyle, a Vatican Observatory astronomer, using the Vatican Advanced Technology Telescope perched on Mount Graham in Arizona. Their discoveries were formally registered in the International Astronomical Union's nomenclature bulletin in April. The other three asteroids honor figures whose work shaped the Observatory across generations: Father Giuseppe Lais, a 19th-century Italian astronomer who spent thirty years as Deputy Director; Cardinal Pietro Maffi, who led the institution from 1904 until his death in 1931; and Father Florent Constant Bertiau, a Belgian Jesuit who founded the Observatory's Computer Centre in 1965 and pioneered digital analysis of astronomical data.
Leo XIII's decision to rebuild the Observatory carried symbolic weight beyond mere institutional restoration. In his 1891 founding document, the Motu Proprio titled "Ut Mysticam," he explicitly framed the Observatory as a response to critics who claimed the Church opposed scientific inquiry. The Observatory would demonstrate, he wrote, that the Church's posture toward "true and solid science" was to "embrace it, encourage it, and promote it with the fullest possible dedication." He envisioned the work as fundamentally spiritual—a discipline that "raises the spirit of mortals to the contemplation of heavenly events."
The Observatory's physical journey mirrors the Church's changing circumstances. When Leo XIII re-established it, Rome's skies were still dark enough for serious observation. The Observatory occupied the Church of St. Ignatius in the city center, its domes visible from the Vatican walls. By the 1930s, electric lighting had begun to wash out the stars. The telescopes were relocated to Castel Gandolfo, the papal summer residence an hour south of Rome, where their distinctive domes remain visible for kilometers across the countryside. Even that refuge proved temporary. Further urban expansion dimmed the skies again, prompting the construction of the Vatican Advanced Technology Telescope in Arizona during the 1990s—a facility that has since become the Observatory's primary research instrument.
The naming of asteroids follows a formal process managed by the International Astronomical Union. When an asteroid is first detected, it receives a provisional designation based on observation date. Only after astronomers have calculated its orbit with sufficient precision—allowing them to predict its future trajectory reliably—does it receive a permanent number. Of roughly 1.3 million known asteroids, approximately 850,000 have been assigned permanent numbers. Once that happens, the discoverers may propose an official name. The proposal goes to the Working Group for Small Body Nomenclature, which reviews it against established guidelines. If approved, the asteroid becomes known by its official designation: a number followed by the name in parentheses.
This is not the first time the Vatican Observatory has seen its history written into the cosmos. In 2000, German astronomer Lutz Schmadel named asteroid (8661) Ratzinger after the then-Cardinal Joseph Ratzinger, later Pope Benedict XVI, in recognition of his work opening the Vatican archives to researchers investigating the Church's historical treatment of Galileo. An earlier asteroid, (560974) Ugoboncompagni, honors Pope Gregory XIII for his calendar reforms and was also discovered using the Vatican telescope in Arizona.
The four new designations carry a particular resonance for the Observatory's leadership. They represent not just recognition of individual contributions, but affirmation of an institution's core mission as Leo XIII defined it: to show the world that faith and rigorous science are not adversaries but companions. The Observatory's research output—its contributions to stellar cartography, light pollution studies, and galactic structure—speaks to that vision across more than a century. Now, four points of light in the asteroid belt will carry forward the names of those who kept that vision alive.
Citações Notáveis
The Church's attitude toward true and solid science is to embrace it, encourage it, and promote it with the fullest possible dedication— Pope Leo XIII, Motu Proprio 'Ut Mysticam' (1891)
The Observatory would help promote a noble science which raises the spirit of mortals to the contemplation of heavenly events— Pope Leo XIII, on the purpose of the Vatican Observatory
A Conversa do Hearth Outra perspectiva sobre a história
Why does the Vatican care about naming asteroids? It seems like a small gesture.
It's not really about the asteroids themselves. It's about what they represent. Leo XIII rebuilt the Observatory specifically to answer critics who said the Church opposed science. Naming asteroids after the people who kept that work alive is a way of saying: this is still our mission.
But why these four people in particular?
They span the Observatory's entire modern history. Leo XIII founded it. Lais and Maffi kept it running through the 20th century. Bertiau brought it into the computer age. Together, they show continuity—the same commitment across generations.
The telescope moved three times. That seems like a lot of disruption.
It does, but it also shows adaptation. They couldn't work in Rome anymore because of the lights. So they moved to Castel Gandolfo. When that didn't work, they built in Arizona. Each move was about preserving the work, not abandoning it.
What's the significance of the Galileo connection—the archives opening?
That's the Church acknowledging a historical wrong. Galileo was silenced. By opening those records, the Church was saying: we can look at our past honestly. Naming an asteroid after Ratzinger for that work shows the Observatory sees itself as part of that reconciliation.
Do these asteroid names actually matter to astronomers?
They matter in the way that all naming matters. An asteroid is just a number until someone gives it a name. Once it has one, it becomes part of the record. Future astronomers will see these names and know the story. That's how institutions preserve their memory.