Astronomers Detect Atmosphere on Trans-Neptunian Object 2002 XV93
Japanese astronomers have discovered a thin atmosphere around the trans-Neptunian object 2002 XV93, marking the first such detection on a Kuiper Belt body other than Pluto. Published in Nature Astronomy, the findings rely on stellar occultation data from January 2024, which showed gradual starlight dimming indicative of atmospheric refraction. This discovery challenges existing models of outer solar system formation, suggesting small icy bodies may retain volatiles through cryovolcanism or recent impacts. The finding significantly advances our understanding of planetary evolution and atmospheric retention in distant celestial environments.
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Atmosphere Discovered on Kuiper Belt Object 2002 XV93
A groundbreaking 2026 study led by Ko Arimatsu has confirmed the existence of an atmosphere on 2002 XV93, a small Kuiper Belt object. This discovery marks only the second time an atmosphere has been detected on a trans-Neptunian object, following Pluto. The findings were derived from precise observations of a stellar occultation in 2024, where the object passed in front of a background star. Data collected from three separate locations allowed scientists to detect the atmospheric signature. Previously, Pluto was unique among known Kuiper Belt objects for possessing an atmosphere, which is generated by the sublimation of surface ices like nitrogen and methane. The presence of an atmosphere on such a tiny world challenges existing models of volatile retention in the outer Solar System. This discovery suggests that other small, distant bodies may also retain atmospheres, reshaping our understanding of planetary formation and evolution beyond Neptune. The research highlights the critical role of direct observation and stellar occultations in uncovering the physical properties of remote celestial bodies.
Big ThinkJapanese Astronomers Detect Atmosphere on Trans-Neptunian Object Beyond Pluto
Japanese astronomers have discovered evidence suggesting the presence of an atmosphere on a small, icy celestial body located beyond Pluto's orbit, challenging previous scientific assumptions about objects in the outer Solar System. The object, identified as (612533) 2002 XV93, is approximately 500 kilometers in diameter and situated about 6 billion kilometers from the Sun. The findings, published in Nature Astronomy, indicate that the atmosphere is extremely thin, estimated to be 5 to 10 million times thinner than Earth's. Researchers detected this feature during a stellar occultation in January 2024, where the star's light faded gradually rather than abruptly, implying atmospheric filtering. This discovery makes the object only the second known trans-Neptunian body with an atmosphere, after Pluto. Scientists hypothesize that the atmosphere may originate from cryovolcanic activity or recent comet impacts, though it is too tenuous to support life. This finding questions the prevailing view that small Kuiper Belt objects are inactive and immutable, potentially impacting ongoing debates regarding the classification of dwarf planets like Pluto.
Digi24Astronomers Detect Thin Atmosphere on Small Trans-Neptunian Object 2002 XV93
A Japanese research team, including an amateur astronomer, has reported the detection of a thin atmosphere around 2002 XV93, a trans-Neptunian object in the Kuiper Belt less than a quarter the size of Pluto. Published in Nature Astronomy, the study describes how starlight dimmed gradually as the object passed in front of a background star in January 2024, suggesting the presence of gas. This finding challenges existing astronomical models, as the object's small size and weak gravity should theoretically prevent it from retaining an atmosphere for more than a millennium. While NASA's James Webb Space Telescope found no surface frozen gases, researchers hypothesize that ice volcanoes or a recent cometary impact may be releasing nitrogen, methane, or carbon monoxide. The discovery implies that global atmospheres might exist on smaller celestial bodies than previously thought, necessitating a revision of traditional planetary formation theories. Although independent verification is required, the implications are significant for understanding the diversity of objects in the outer solar system. The article also briefly touches on ongoing political discussions regarding Pluto's planetary status, but the core focus remains on this specific scientific breakthrough concerning atmospheric retention on small icy worlds.
Universe TodayScientists Detect Atmosphere on Minor Planet Beyond Pluto
A team of astronomers from the National Astronomical Observatory of Japan has detected an atmosphere on a minor planet in the Kuiper Belt, marking only the second such discovery after Pluto. The object, designated 2002 XV93, is approximately 311 miles in diameter and located billions of miles from Earth. Researchers observed the trans-Neptunian object during a stellar occultation in January 2024, noting a gradual fade in starlight that indicated the presence of a thin gaseous envelope. Published in Nature Astronomy, the study suggests the atmosphere is five to ten million times thinner than Earth's. Potential origins include cryovolcanic activity or a recent impact by a small icy body. If caused by an impact, the atmosphere may dissipate within centuries; if driven by internal geological processes, it could persist longer. The team plans to use NASA’s James Webb Space Telescope for further monitoring to identify specific gases like methane or carbon monoxide and determine the atmosphere's longevity. This finding challenges existing models of atmospheric formation on small celestial bodies and highlights the dynamic nature of objects in the outer solar system.
FuturismStudy Suggests Icy Object Beyond Pluto Has Unexpected Atmosphere
Japanese astronomers have detected evidence of a thin atmosphere surrounding (612533) 2002 XV93, a small icy object in the Kuiper Belt beyond Pluto. Published in Nature Astronomy, the study challenges existing assumptions that such small, cold bodies cannot sustain atmospheres. The discovery was made during a stellar occultation in January 2024, where observations from three sites in Japan recorded a smooth attenuation of starlight, indicating atmospheric refraction. The atmosphere is estimated to be millions of times thinner than Earth's and likely temporary, lasting less than 1,000 years without replenishment. Since the object lacks surface frozen gases for sublimation, researchers speculate the atmosphere may result from cryovolcanism or a recent comet impact. Independent verification is sought, with experts like Alan Stern emphasizing the need for follow-up observations using the James Webb Space Telescope. Confirming these findings could profoundly impact our understanding of atmospheric formation and retention in the outer solar system, prompting further monitoring to determine if the atmosphere persists or fades.
Latest from Live ScienceAstronomers Detect Atmosphere on Pluto-like Trans-Neptunian Object 2002 XV93
A team of Japanese professional and amateur astronomers has discovered a thin atmosphere around the trans-Neptunian object (TNO) 612533 2002 XV93, marking the first detection of an atmosphere on a TNO other than Pluto. The findings, published in Nature Astronomy, rely on observations from a stellar occultation event in January 2024. As the object passed in front of a distant star, astronomers noted a gradual dimming of starlight rather than an abrupt cutoff, indicating refraction through a gaseous layer with a surface pressure of 100 to 200 nanobars. This discovery challenges the conventional view that small, cold outer solar system bodies are inactive. The origin of the atmosphere remains uncertain, as no surface volatile gases were detected by the James Webb Space Telescope. Leading hypotheses suggest either cryovolcanic outgassing from the interior or a recent comet impact releasing trapped gases. Experts note that this finding implies small TNOs may retain volatile species like methane or nitrogen, offering new insights into the volatile inventory and formation history of the outer solar system.
Sky & TelescopeTrans-Neptunian Object 2002 XV93 May Possess Thin Atmosphere
Astronomers have discovered evidence suggesting that 2002 XV93, a small icy body located beyond Pluto, possesses a thin atmosphere. This finding, reported in Nature Astronomy by Ko Arimatsu and colleagues from the National Astronomical Observatory of Japan, marks the first potential detection of an atmosphere on a solar system object of this size farther from the Sun than Pluto. The discovery was made through stellar occultation observations on January 10, 2024, using telescopes in Japan. Instead of the starlight blinking out sharply, it faded gradually over 1.5 seconds, indicating refraction through a tenuous atmosphere with pressure roughly one ten-millionth of Earth's. Given the object's small size (470 kilometers wide), its gravity should be too weak to retain gas long-term, suggesting the atmosphere may be transient. Possible sources include recent cometary impacts or cryovolcanism. While dust cannot be entirely ruled out, future observations will determine if the atmosphere persists or fades, helping to distinguish between volcanic activity and impact events. This challenges previous assumptions about the inactivity of small trans-Neptunian objects.
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