Asteroid Occultation 2026: Indonesia Astronomy Collaboration & Observation

Bosscha Observatory in Indonesia held an online colloquium on March 14, 2026, to discuss collaborative opportunities for observing the occultation of a star by the asteroid Strenua on April 26, 2026. The event, which will be visible across parts of Indonesia and Australia, involves an asteroid passing between Earth and a distant star, temporarily dimming the star’s light.

The colloquium, broadcast via the Bosscha Observatory’s YouTube channel, focused on coordinating observation efforts, particularly within the narrow path of the asteroid’s shadow. Researchers emphasized the importance of a network of observers to capture precise timing data as Strenua passes in front of the star HIP 35933. The data collected will be used to create a “light curve,” a graph of the star’s brightness over time, which will allow astronomers to determine key properties of the asteroid.

“The more observation points involved, the more accurate the information that can be obtained,” said Agus Triono, a researcher at Bosscha Observatory, according to a statement released by the Institut Teknologi Bandung (ITB). This highlights the need for collaboration between astronomy communities, observatories, and amateur skywatchers throughout Indonesia.

Asteroid occultations are a valuable tool for astronomers, offering a high-resolution method for studying celestial bodies. Unlike traditional telescopic observations, occultations can achieve resolutions comparable to more sophisticated techniques and are less affected by light pollution. The technique allows for precise estimations of an asteroid’s diameter, shape, and orbit.

The upcoming occultation of Strenua is particularly significant due to limited existing data on the asteroid. Observations during the April 26th event are expected to improve the accuracy of information regarding its size, shape, and trajectory. The predicted path of the occultation crosses several Indonesian islands, including Sumatra, Java, Bali, West Nusa Tenggara, and East Nusa Tenggara, extending into Australia.

Bosscha Observatory is actively encouraging wider collaboration between institutions, communities, and individual observers to prepare for the occultation. The observatory noted that the event’s brief duration requires rapid photometric techniques – capturing as many images as possible within a short timeframe – and that data from a single observation point is limited, necessitating simultaneous observations from multiple locations.

Understanding the characteristics of asteroids like Strenua is crucial for planetary defense efforts and for learning more about the formation of our solar system. The data gathered will contribute to a more comprehensive database of near-Earth objects.