In July 2025, astronomers announced an exciting discovery: a new object in our Solar System nicknamed Ammonite (officially called 2023 KQ14).

This distant world is helping scientists learn more about the far reaches of our cosmic neighborhood.

When Was Ammonite Discovered?

Ammonite was first spotted in March, May, and August 2023 using the powerful Subaru Telescope at Mauna Kea Observatory in Hawaii. Scientists confirmed its orbit in July 2024 with the Canada-France-Hawaii Telescope. They also found older images of Ammonite from 2005, 2014, and 2021, which helped them understand its path. The discovery was shared with the world in July 2025 in a science journal called Nature Astronomy.

Where Is Ammonite in Our Solar System?

Ammonite is a trans-Neptunian object, meaning it’s located far beyond the planet Neptune in a region called the outer Solar System. It’s one of only four known sednoids, objects with super far-out orbits. Ammonite travels in a stretched-out, oval-shaped path around the Sun.

At its closest point (called perihelion), it’s about 66 astronomical units (AU) from the Sun. At its farthest point (aphelion), it’s a whopping 252 AU away.One AU is the distance from Earth to the Sun, about 93 million miles.

How Far Away Is Ammonite?

So, Ammonite is between approximately 0.001 and 0.004 light years from the Sun, and 0.00398 light years farthest orbit, depending on its position and distance from the sun.

The distance from Earth to Ammonite, based on its position near perihelion (the point in an object’s orbit where it is closest to the Sun), is approximately 0.00111 light-years.

Could Humans Ever Travel to Ammonite?

Traveling to Ammonite would be a huge challenge. Even our fastest spacecraft, like NASA’s Voyager probes, would take tens of thousands of years to reach it. With current technology, humans can’t travel that far.

Future advancements, like super-fast propulsion systems, might make it possible someday, but it’s not something we can do now.

Sending robotic probes would be more realistic, but even that would take decades and lots of planning.

What Is Ammonite Made Of?

Scientists don’t yet know exactly what Ammonite is made of because it’s so far away and hard to study up close.

However, most objects in the outer Solar System, like other trans-Neptunian objects, are made of ice, rock, and frozen gases like methane, ammonia, or water ice.

Ammonite is likely a mix of these materials, giving it a cold, icy surface. It’s estimated to be 137 to 236 miles wide (220–380 kilometers), smaller than a planet but bigger than most asteroids.

Is There Life or Water on Ammonite?

There’s no evidence of life or liquid water on Ammonite. Its surface is probably covered in frozen ices, and it’s far too cold for liquid water to exist.

Life as we know it needs warmth, liquid water, and energy, which Ammonite likely doesn’t have. However, frozen water (ice) might be part of its makeup, as many distant objects have water ice locked in their surfaces.

What’s the Average Temperature on Ammonite?

Ammonite is so far from the Sun that it’s extremely cold. Scientists estimate its temperature to be around -400°F (-240°C) or even colder. This is much too cold for humans or any known life to survive without advanced technology.

Could Humans Live on Ammonite?

No, humans couldn’t live on Ammonite. It’s not a planet with a solid surface like Earth—it’s a small, icy object with no atmosphere, no air to breathe, and freezing temperatures.

Plus, it’s so far from the Sun that there’s barely any sunlight for energy. Even with future technology, living on Ammonite would be nearly impossible.

Why Is Ammonite Important?

Ammonite is special because it’s only the fourth sednoid ever found, joining Sedna, 2012 VP113, and Leleākūhonua.

Its orbit is unique—it travels in the opposite direction of the other sednoids, which surprises scientists. This suggests the outer Solar System is more complex than we thought. Ammonite’s orbit has stayed the same for 4.5 billion years, making it like a “fossil” that holds clues about how our Solar System formed.

This discovery also raises questions about Planet Nine, a possible hidden planet some scientists think influences distant objects.

Ammonite’s orbit doesn’t fit the patterns expected for Planet Nine, so it might mean that Planet Nine may not exist, or it was ejected long ago.

Scientists think Ammonite’s orbit could have been shaped by an ancient event, like a star passing close to our Solar System or an early planet moving around.

Ammonite also shows that a “gap” in objects between 50–75 AU might not be real—it could just be that we haven’t spotted other objects yet due to how faint and far they are. More discoveries like Ammonite could help us understand the Solar System’s history better.

What’s Next for Ammonite?

Scientists are still studying Ammonite using telescopes like the Subaru and Canada-France-Hawaii Telescope.

The FOSSIL project, led by researchers from Japan and Taiwan, will keep looking for more distant objects. Future telescopes or space missions might tell us more about Ammonite’s surface, composition, and role in the Solar System.

Learn More

Sources:

For more details, check out the scientific study published in Nature Astronomy on July 14, 2025: Nature Astronomy – Discovery of Ammonite (2023 KQ14).

Ammonite is an exciting find that shows how much more there is to learn about our Solar System. It’s a reminder that even in our cosmic backyard, new worlds are waiting to be explored.

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