What's happened
Astronomers have identified a tiny trans‑Neptunian object, (612533) 2002 XV93, with a detectable atmosphere, according to Nature Astronomy. The atmosphere is extremely thin, and its origin could be enduring cryovolcanism or a recent impact. Observations were conducted during a stellar occultation in 2024.
What's behind the headline?
analysis
- The findings challenge the view that atmospheres form only on larger bodies; they show that even small icy worlds can host atmospheres under the right conditions.
- The study presents two competing mechanisms and emphasizes the need for follow‑up observations, including potential Webb Space Telescope data, to determine atmospheric composition and persistence.
- This update appears to shift expectations about the dynamism of distant Solar System objects and could influence models of atmospheric retention in small bodies.
brief:
- What’s new: a 310‑mile object in the Kuiper Belt may have a real, albeit extremely thin, atmosphere.
- Why it matters: it expands the set of bodies considered capable of hosting atmospheres and prompts questions about cryovolcanism and impact events at extreme distances.
- Next steps: additional observations to verify composition and assess whether the atmosphere persists or fades over time.
How we got here
Researchers have focused on trans‑Neptunian objects in the Kuiper Belt. (612533) 2002 XV93 is about 310 miles (500 km) in diameter and orbits the Sun at roughly 3.4 to 5.5 billion miles away. The object’s atmosphere is estimated to be 5–10 million times thinner than Earth’s and 50–100 times thinner than Pluto’s. Two explanations are proposed: a long‑lasting atmosphere sustained by internal gas supply or a temporary atmosphere generated by an impact.
Our analysis
The Times of Israel reports on the Nature Astronomy study led by Ko Arimatsu; AP News and NY Post cover corroborating perspectives from other researchers and observers. The NYT piece features quotes from Michael Brown and others analyzing the occultation data.
Go deeper
- What would confirm an enduring atmosphere on such a small body?
- Could similar atmospheres exist on other trans‑Neptunian objects?
- When will Webb Space Telescope observations occur to verify composition?
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National Astronomical Observatory of Japan - Astronomical observatory
The National Astronomical Observatory of Japan is an astronomical research organisation comprising several facilities in Japan, as well as an observatory in Hawaii and Chile.