GoKawiilAmateur astronomers use DIY telescope rigs to measure asteroid shapes via star occultations
A hobbyist describes using a modest, low-cost telescope setup—including a 130-millimeter Newtonian scope, a motorized equatorial mount running the open-source OnStep controller, and a GPS-timed flasher for calibration—to observe asteroid occultations, when an asteroid passes in front of a distant star and briefly blocks its light. By timing these fleeting shadow events, amateur observers can help map an asteroid's shape and size, work that is difficult for large observatories to do alone.
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Because the technique depends on precise timing and location rather than telescope size, it opens asteroid science to amateurs with modest budgets, letting distributed networks of hobbyists gather data professional observatories can't easily collect due to their fixed locations and scheduling constraints. This kind of citizen science could meaningfully contribute to planetary defense and asteroid characterization efforts if enough observers coordinate around predicted occultation events.
- Asteroid occultations occur when an asteroid blocks light from a distant star, casting a brief, narrow shadow on Earth.
- A basic setup—an affordable Newtonian telescope, a motorized mount, and a GPS-based timing flasher—can be used to capture these events.
- Because measurement doesn't require large telescopes, amateur astronomers can collectively help determine asteroid shapes and sizes.
Unistellar eVscope Smart Telescope — This smart telescope is designed with citizen astronomy in mind, including built-in support for tracking and timing asteroid occultation events. Its automated star alignment and light-sensitive sensor make it easier for amateurs to capture the fleeting shadow of an asteroid crossing a star, exactly the kind of DIY measurement described in the article. It's a great way to get into serious sky-watching without needing a mountaintop observatory.
See Unistellar eVscope Smart Telescope on Amazon → Affiliate link — we may earn a commission on purchases, at no extra cost to you. Product picked by AI based on this article; it is not a tested recommendation.Source: spectrum.ieee.org — David Schneider, 2026-09-24
Published there as: “Measure Distant Asteroids With a DIY Rig”
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