Near-Earth Object/Asteroid 2026 JH2

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SUMMARY

The near-Earth asteroid 2026 JH2, approximately 20 meters in diameter, was discovered on May 10, 2026, by the Mount Lemmon Survey near Tucson, Arizona. It will pass within 91,000 ± 4,500 kilometers of Earth on May 18, 2026, marking a notably close but not unprecedented encounter. The Steward Observatory, operated by the University of Arizona's Department of Astronomy, supports the Mount Lemmon Survey's detection efforts. Similar close approaches have occurred recently, including asteroid 2025 TF, which passed approximately 260 miles from Earth's surface. The late detection of 2026 JH2 highlights ongoing challenges in near-Earth object monitoring.

PREREQUISITES

  • Near-Earth Object (NEO) tracking techniques
  • Asteroid size and distance measurement methods
  • Mount Lemmon Survey observational protocols
  • Orbital mechanics and close approach prediction

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  • Study Minor Planet Center database query tools for NEO data retrieval
  • Analyze Virtual Telescope Project's online observation techniques for asteroid tracking
  • Explore NASA JPL Small-Body Database for orbital parameters and risk assessment
  • Investigate improvements in early detection systems for small near-Earth asteroids

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Astronomers, planetary defense researchers, space mission planners, and astrophysics students focused on near-Earth object detection, tracking, and risk mitigation strategies.

Astronuc
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A near-earth asteroid was discovered on 10 May 2026. It is expected to pass close to earth, 91,000 ± 4,500 kilometres (56,500 ± 2,800 mi) from Earth on 18 May 2026,.

https://en.wikipedia.org/wiki/2026_JH2
https://www.minorplanetcenter.net/db_search/show_object?object_id=2026+JH2
https://www.virtualtelescope.eu/202...ose-encounter-online-observation-18-may-2026/
https://theskylive.com/2026jh2-info

The asteroid was discovered through the Mount Lemmon Survey located on a mountain northeast of Tucson, Arizona. The Steward Observatory is operated by the University of Arizona's Department of Astronomy.
https://en.wikipedia.org/wiki/Mount_Lemmon_Survey
https://en.wikipedia.org/wiki/Mount_Lemmon_Observatory
 
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Astronuc said:
It is expected to pass close to earth, 91,000 ± 4,500 kilometres

Glad it wasn't 4,500 ± 91,000
 
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2026 JH2, which is approaching its closest distance to Earth today is about 20 meters (66 feet) in diameter. The concern is that it got so close before being detected.

https://www.wired.com/story/asteroi...fly-right-past-the-earth-relatively-speaking/

Its passage, while noteworthy, is not rare; in fact, in the past year, many objects have come as close if not closer. Noteworthy among these was, for example, the passage of the small asteroid 2025 TF about 260 miles) from Earth's surface.
https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=2025 TF&view=OPC
 
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