How Much Is an Asteroid Worth? The Honest Math

Every year or two the same story goes round: NASA is visiting an asteroid "worth $10 quintillion", enough to make everyone on Earth a billionaire. The asteroid is 16 Psyche, the number is real in the sense that someone calculated it, and it is also one of the most misleading figures in popular science. Here is where it came from, why it does not mean what the headlines imply, and what an asteroid is actually worth.

Where the $10 quintillion came from

The number has a known author. Lindy Elkins-Tanton, the lead scientist on NASA's Psyche mission, has said in interviews that the estimate came from her, worked out around 2017 by taking the asteroid's estimated mass, assuming it was mostly iron and nickel with some gold, and multiplying by the market price of those metals. She has since described the figure as essentially meaningless, because there is no technology to bring the material back and because flooding the market with that much metal would make it worthless.

So the person who produced the number disowns it. That should be the end of the story, but it is worth going through the arithmetic, because the same mistake gets made about every asteroid.

Step one: the asteroid is probably not what the number assumed

The $10 quintillion figure assumed Psyche was essentially a lump of exposed planetary core. Later work has undercut that. A 2021 study led by David Cantillo matched telescope spectra to laboratory mixtures and estimated Psyche at roughly 82 percent metal with about 35 percent porosity, more like a loosely packed rubble pile than a solid ingot. A 2022 paper from Brown and Purdue in JGR: Planets went further, finding it very unlikely that an all-iron body of Psyche's size could stay that porous, which means it probably is not an all-iron body at all.

We will find out. The Psyche spacecraft flew past Mars in May 2026 and is on track to enter orbit around the asteroid in August 2029. Until then, any valuation is built on a composition nobody has measured.

Step two: the market cannot absorb it

Suppose Psyche were all metal. Its mass is about 2.3 × 10¹⁹ kg, or 23 million billion tonnes. The whole world mined about 2.4 billion tonnes of iron ore in 2024. Divide one by the other and Psyche holds roughly ten million years of current global iron ore output.

A price is what someone pays for the next tonne, not what you get for all of them at once. Iron ore is cheap precisely because it is abundant. Deliver even a tiny fraction of Psyche to Earth and the price of iron would fall toward the cost of handling it. The $10 quintillion figure multiplies a quantity by a price that would not survive the quantity.

The same logic applies to the metals people actually dream about. Take platinum, the most-cited asteroid prize. The World Platinum Investment Council put total 2025 demand at about 7.8 million ounces, roughly 240 tonnes. At the roughly $1,700 per ounce the metal traded at in early October 2026, the entire annual global platinum market is worth about $13 billion. That is the whole market: every car catalyst, every ring, every investment bar, for a year. An asteroid mine that returned 240 tonnes of platinum would not earn $13 billion; it would double the world's supply and collapse the price.

Step three: it costs more to get there than the cargo is worth

Now the cost side. The only two missions that have brought asteroid material to Earth are Japan's Hayabusa2 and NASA's OSIRIS-REx. OSIRIS-REx cost about $1.02 billion over its lifetime and returned 121.6 grams of Bennu. That is roughly $8 million per gram. A commercial return mission would be far cheaper per kilogram than a one-off science mission, but it gives a sense of the starting point: we are many orders of magnitude away from a cost per kilogram that competes with a mine in South Africa.

Even the cheap end of the field makes the point. AstroForge's first prospector, Odin, cost under $7 million and was lost weeks after launch without reaching its target. Its successor is budgeted at under $10.5 million and will carry a camera, not a shovel. Those missions are not designed to return anything. They are designed to find out what is there, because today nobody knows.

Step four: the famous "platinum asteroids" were not

The $10 quintillion story has smaller cousins. In 2015 the asteroid 2011 UW158 passed Earth and was widely reported as a "$5 trillion platinum asteroid". Radar observations from Arecibo showed a 300 by 600 metre body spinning once every 37 minutes with no more metal than an ordinary rocky asteroid. The platinum figure came from a speculative composition, not a measurement. The pattern repeats: a valuation is published, a measurement arrives years later, and the valuation quietly disappears.

So what is an asteroid actually worth?

Here is a more useful way to think about it. The value of a resource depends on where it is and who needs it there.

On Earth, iron is worth about nothing per kilogram and platinum is worth about $55 per gram, and both are already available. In Earth orbit, every kilogram of anything has had to be launched from the ground at a cost of thousands of dollars, and that is the real price benchmark for asteroid resources. Water split into hydrogen and oxygen is rocket propellant. A tonne of water delivered to a fuel depot in orbit is worth whatever it would have cost to launch that tonne from Earth, and that is a price that does not collapse the moment someone delivers it, because the demand grows with every mission that no longer has to carry its own fuel.

That is why the companies actually flying prospectors have moved away from platinum. Karman+ is hunting water-bearing asteroids to supply the in-space economy, and AstroForge's next mission carries a camera to characterise its target, not equipment to extract from it. The honest valuation of an asteroid today is the value of knowing what it is made of, because that knowledge decides whether anyone sends a second spacecraft.

The honest answer in one paragraph

Psyche is worth roughly what any uninhabited mountain range is worth: a great deal in principle, nothing you can bank. The $10 quintillion figure multiplied a guessed composition by a price that would not survive the sale. Real asteroid value will be measured in tonnes of water sold in orbit and in datasets that de-risk the next mission, and the first numbers in that ledger will be in the millions, not the quintillions. Anyone selling you a bigger number is selling.

Frequently asked questions

Is 16 Psyche really made of metal? Partly, and probably much less than the early estimates. Telescope studies suggest something like 80 percent metal by spectral match but with substantial porosity and rock mixed in. The spacecraft arriving in 2029 will settle it.

Which asteroid is worth the most? There is no honest answer, because "worth" needs a buyer and a delivery location. The near-Earth asteroids that are cheap to reach and might hold water are the valuable ones for the next few decades; our research brief on target selection ranks those.

Could asteroid mining crash the gold or platinum price? Only if someone returned large quantities to Earth, which nobody has a plan or an economic reason to do. The first markets are in space.

Is asteroid mining a good investment? We are not in a position to say and do not offer financial advice. The companies are private, the first missions have failed or slipped, and the timelines run to the 2030s. Frontier is a community-funded research project, not an investment.

Frontier is building in public. Our research briefs, treasury and roadmap are open for anyone to read and check. See how to take part at thefrontier.space/rewards.