Comet C/2025 R3 (PanSTARRS) on April 8, 2026, from eastern Crete. (Image credit: Dimitrios Katevainis)
A long-period comet known as Comet C/2025 R3 (Pan-STARRS) is becoming visible in Earth’s skies, offering a rare viewing opportunity as it makes its first return to the inner solar system in approximately 170,000 years. The comet is currently approaching its closest point to the sun, with visibility expected to improve briefly before it fades from view.
The object was first identified by the Pan-STARRS survey in 2025 and is classified as a long-period comet, meaning it originates from distant regions of the solar system and takes tens of thousands of years to complete a single orbit. Astronomers expect it to brighten significantly as it nears perihelion around April 19–20, though viewing conditions may remain challenging due to its proximity to the sun, according to Jamie Carter writing for Space.com.
At present, the comet’s brightness is near magnitude +6, placing it at the threshold of naked-eye visibility under very dark skies. It may brighten to around magnitude +3 in the coming days, which would make it easier to observe with binoculars and potentially visible without optical aid in ideal conditions. However, as it brightens, it will also appear lower on the horizon and closer to the sun, reducing visibility during twilight.
Observers in the Northern Hemisphere are advised to look toward the eastern horizon approximately 90 minutes before sunrise. The optimal viewing period is between April 10 and April 20, when the comet is bright enough to detect but not yet overwhelmed by daylight. Clear skies and an unobstructed view of the horizon are essential for successful observation.
The comet will move through the region of the sky known as the Great Square of Pegasus during this period. This asterism, formed by four prominent stars, can serve as a reference point for locating the comet. Around April 18, the comet will pass near the galaxy NGC 7814, providing a notable alignment for observers using telescopes or cameras.
Viewing conditions will vary by location. While Northern Hemisphere observers have a limited early-morning window, those in the Southern Hemisphere may have improved visibility later in April and into May, as the comet moves away from the sun in their skies.
Astronomers note that comets are inherently unpredictable, and their brightness and visibility can change rapidly. While binoculars are recommended for clearer observation, even basic equipment can help distinguish the comet’s diffuse glow and developing tail.
Because of its long orbital period, this comet represents a one-time opportunity for current observers. Once it passes through the inner solar system, it will not return for tens of thousands of years.