Stargazers in Brunei watched the waning crescent Moon move directly across Jupiter on Wednesday morning, hiding the solar system's largest planet from view for several minutes in an event known as a lunar occultation. The Astronomical Society of Brunei Darussalam (PABD) said the alignment placed the Sultanate inside the narrow band of the globe from which the passage was visible, according to The Star.
Observers followed the sequence from its earliest stage, when Jupiter drew close to the Moon's bright edge before dawn, through ingress, when the 38 per cent illuminated crescent swallowed the planet, and finally egress, when it emerged on the Moon's far side.
Why it matters
The PABD describes an occultation as the result of Earth, the Moon and Jupiter falling into a straight line in space, a geometry that puts the Moon squarely between ground-based observers and the planet.
For Brunei, the timing of that geometry is what makes Wednesday's event notable. The Star reports that the last lunar occultation of Jupiter visible from the country occurred more than ten years ago, on August 6, 2016, and that local observers will not get another chance until April 12, 2038.
The event also drew attention beyond Brunei. Outlets in other regions covered the same alignment, with Arab News reporting on the Moon and Jupiter appearing together over Saudi Arabia, and Sky & Telescope and The Daily Galaxy among those carrying coverage of the occultation and related observations of Jupiter's moons.
Timing varied by district
The Star reports that the exact schedule shifted slightly depending on where in Brunei observers were stationed.
In Bandar Seri Begawan, Jupiter slipped behind the Moon at 6.13am and came back into view at 6.30am, a span of roughly 17.5 minutes. In Tutong, the disappearance came at 6.10am and the reappearance at 6.33am.
The occultation unfolded after sunrise, which would normally rule out naked-eye viewing. But the PABD noted that Jupiter's brightness, at magnitude -2.0, combined with its high position in the sky, kept it within reach of binoculars and telescopes. Stargazers reportedly began tracking the approach in the predawn hours, when Jupiter appeared as a bright star just below the Moon.
A viewing path across several countries
Brunei was one of several places positioned to see the passage. The Star reports that the viewing path also crossed Australia, Indonesia, India and Malaysia, meaning the same event was observable across a wide stretch of the region.
Members of the PABD and local astrophotographers recorded the full sequence from multiple locations in Brunei, capturing the approach, the disappearance and the reappearance as they happened.
The next opportunity to see Jupiter hidden by the Moon from Brunei is expected on April 12, 2038, according to The Star.
