Comet C/2025 R3 (PanSTARRS) in May 2026: Current Visibility, Magnitude, and Best Viewing Dates
As of May 13, 2026, Comet C/2025 R3 (PanSTARRS) is no longer a good target for the Northern Hemisphere, but it is visible in the evening sky for Southern Hemisphere observers. The comet has already passed its peak brightness and is now fading, but it is also moving farther from the Sun in the sky, which should make it easier to catch from the end of April through May. For the best chance, use binoculars, choose a place with a clear horizon, and check the comet’s exact position in the Star Walk 2 app.
Contents
- Comet C/2025 R3 (PanSTARRS) At a Glance
- Comet C/2025 R3 (PanSTARRS): When And Where to See?
- Comet C/2025 R3 (PanSTARRS): Finder Charts
- Comet C/2025 R3 (PanSTARRS): Latest News
- What is Comet C/2025 R3?
- Comet C/2025 R3: Orbit and trajectory
- Comet C/2025 R3: Discovery
- C/2025 R3 (PanSTARRS): frequently asked questions
- Comet C/2025 R3: Summary
Comet C/2025 R3 (PanSTARRS) At a Glance
- Official name: C/2025 R3 (PanSTARRS)
- Also written as: C2025 R3, PanSTARRS comet, comet Pan-STARRS
- Peak brightness: reached about mag 1.5 around April 26; was too close to the Sun to be observed visually
- Perihelion: April 19, 2026, 21:28 GMT (~0.49 AU)
- Closest approach to Earth: April 26, 2026 (~0.48 AU)
- Best viewing: Southern Hemisphere (late April to early May, evening sky)
Comet C/2025 R3 (PanSTARRS) Right Now: May 13, 2026
- Visible right now: yes, through telescopes in the evening sky
- Current brightness: mag 6.8
- Constellation: Orion
- Distance to the Sun: 0.73 AU
- Distance to Earth: 0.90 AU
- Elongation: 44.9°
Comet C/2025 R3 (PanSTARRS): When And Where to See?
Comet C/2025 R3 (PanSTARRS) is now a promising target for the Southern Hemisphere. The comet has passed its brightest point and is fading, but it is also moving farther from the Sun in the sky. That means it may become easier to observe in practice over the next several evenings, even as its magnitude number gets higher.
From the Northern Hemisphere, the best observing window has already closed. C/2025 R3 was a morning target before perihelion, but by late April it moved too close to the Sun in the sky. Since the end of April, it has been generally lost in bright twilight for northern observers.
Comet C/2025 R3 (PanSTARRS): Visibility & Viewing Tips for the Northern Hemisphere
For observers in the Northern Hemisphere, C/2025 R3 is largely lost in the Sun’s glare. The comet was best placed before perihelion, when it appeared low in the pre-dawn sky. The next practical observing opportunities belong mainly to the Southern Hemisphere.
Comet C/2025 R3 (PanSTARRS): Visibility & Viewing Tips for the Southern Hemisphere
In the Southern Hemisphere, the comet was poorly placed at first, but conditions are improving as it shifts into the evening sky:
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From late April into early May: This should be the most rewarding viewing window for the Southern Hemisphere. By then, the comet is expected to appear in the evening sky and move farther from the Sun, making it easier to follow after sunset. In early May, it may still be around magnitude 4, bright enough to stand out well in 10×50 binoculars. A small telescope will show more detail, and under dark skies the comet may still be visible to the naked eye.
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By late May: The comet is expected to fade to around magnitude 9 to 10, making it mainly a target for telescopes rather than binoculars.
Comet C/2025 R3 (PanSTARRS): Finder Charts
Here’s what Comet C/2025 R3 (PanSTARRS) will be doing in the sky in April-May 2026 — including the best observing windows, the most photogenic pairings, and the moments when the comet passes interesting deep-sky landmarks. If you’re planning to observe or photograph the comet, this is where to start.
Comet C/2025 R3 (PanSTARRS) in April 2026: from Pegasus to Taurus
In April 2026, Comet C/2025 R3 (PanSTARRS) moves quickly through several constellations, passes notable background objects, and shifts from a morning target in the Northern Hemisphere to a more favorable evening object in the Southern Hemisphere. For skywatchers, this is the month to watch closely; for astrophotographers, it offers the most dramatic combinations — but also the biggest challenge, since the comet gets closer to the Sun in the sky.
- In early April, the comet entered the Great Square of Pegasus and took about a week to sweep across this famous asterism.
- On April 17, it passed within about 2° of the galaxy NGC 7814 (mag 11).
- On April 19, the comet crossed from Pegasus into Pisces. To its east, skywatchers could also spot Mercury, Mars, Saturn, and Neptune gathered in a 4-planet parade.
- On April 24, C/2025 R3 made a brief detour into Aries, spending only a couple of hours within the constellation.
- On April 25, the comet moved into Cetus. By then, it lies very close to the Sun in the sky, making it difficult to observe. A few days later, it becomes essentially unobservable from the Northern Hemisphere, moving to the Southern sky.
- On April 29, the comet ends its brief visit to Cetus and moves to Taurus, where it remains through early May.
Comet C/2025 R3 (PanSTARRS) in May 2026: Through Eridanus, Orion, and Monoceros
By May 2026, Comet C/2025 R3 (PanSTARRS) is expected to be fading, but it may still be very rewarding — especially for astrophotography. As the comet becomes better placed for southern observers, it passes several well-known deep-sky objects, creating opportunities for more scenic compositions. In other words, May may bring a dimmer comet, but also some of the most interesting photo opportunities of the season.
- On May 1, the comet enters the constellation Eridanus.
- From May 7 to 8, C/2025 R3 passes between two deep-sky objects: the Witch Head Nebula (NGC 1909, mag 8) and NGC 1788 (mag 10).
- On May 8, the comet enters the constellation Orion.
- From May 10 to 12, C/2025 R3 can be seen within about 2° of the Orion Nebula.
- On May 16, the comet crosses the border between Orion and Monoceros.
- From May 23 to 25, the comet passes within about 1° of the Red Rectangle Nebula (mag 9).
Comet C/2025 R3 (PanSTARRS) visibility under moonlight
When preparing to observe a comet, the Moon is an important factor to consider, as its brightness can wash out faint celestial objects. That’s why planning around the Moon’s cycle is crucial. Here’s how it looks for May 2026:
- May 1, 2026 – Full Moon: the worst time for observation — the Moon’s glare dominates the sky all night, overwhelming faint details of the comet.
- May 9, 2026 – Last Quarter: conditions begin to improve again, with the Moon rising later at night and leaving the early hours darker.
- May 16, 2026 – New Moon: the best dark-sky window of the month. Moonlight will not interfere, but by this time the comet will be fainter, so binoculars or a small telescope will be strongly recommended.
- May 23, 2026 – First Quarter: moonlight returns to the evening sky, making faint comet details harder to see. The comet will also be fading further, so a telescope may be needed.
- May 31, 2026 – Full Moon: poor conditions again. The bright Moon will wash out the sky, and by late May C/2025 R3 is expected to be much fainter.
To maximize your chances, try observing during the first half of May, when the comet is still bright enough for binoculars, and especially around the New Moon on May 16, when the sky will be darkest. For more convenient planning, check the Moon Calendar on our website: it shows moonrise and moonset times, as well as the Moon phase and illumination, tailored for your location.
Comet C/2025 R3 (PanSTARRS): Latest News
Follow the latest updates on Comet C/2025 R3 (PanSTARRS) — including new images, brightness estimates, and visibility updates as the comet continues its journey.
May 4: Comet C/2025 R3 (PANSTARRS) Is Visible in the Southern Sky
Comet C/2025 R3 (PANSTARRS) has returned to view after its close approach to the Sun — and this time it’s a target for Southern Hemisphere observers. Recent reports show the comet low in the western sky after sunset, with an estimated brightness around magnitude 4–5. It is unlikely to be easily spotted with the naked eye, but binoculars, a small telescope, or even a camera can reveal it under good conditions.
For the best chance, look about an hour after sunset from a place with a clear, unobstructed western horizon — beaches, open fields, or hills with no trees or buildings in the way are ideal. The comet is fading now, but it is also moving into darker skies, so the next several evenings may still bring good views. In binoculars, look for a small fuzzy glow; in photos, the coma and tail should stand out more clearly.
Astrophotographers should be ready to shoot: the geometry over the next few days could even produce a faint anti-tail — a sharp, Sunward-pointing spike that is usually easier to capture photographically than to see visually. Short exposures stacked together may help bring out the tail before the comet sinks below the horizon.
Earlier updates from April 2026
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April 28: Comet C/2025 R3 (PanSTARRS) has left SOHO’s view and was soon to return to the Southern Hemisphere’s evening sky.
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April 26: Around its closest approach to Earth, Comet C/2025 R3 (PanSTARRS) showed a narrow ion tail alongside its broader dust tail in SOHO images.
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April 24: Comet C/2025 R3 (PANSTARRS) appeared in images from the SOHO spacecraft while it was too close to the Sun to be observed from the ground.
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April 20: Comet C/2025 R3 (PanSTARRS) passed perihelion. The expected dramatic forward-scattering boost did not appear to happen.
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April 17: Observer reports confirmed that Comet C/2025 R3 (PanSTARRS) had become visible to the naked eye under good dark-sky conditions.
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April 16: Over just a few days, the comet brightened noticeably and its tail began changing shape, appearing broader and more spread out.
- April 16: Comet C/2025 R3 (PanSTARRS) began developing a faint anti-tail — a rare perspective effect caused by larger dust particles along the comet’s orbit.
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April 15: As the comet moved to less than 30° from the Sun, it continued to brighten but also became harder to spot in the strengthening morning twilight.
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April 13: By April 13, Comet C/2025 R3 (PanSTARRS) had already crossed the technical magnitude threshold often associated with naked-eye visibility.
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April 11: New images suggested that the comet was developing a more complex tail structure, including two distinct features within its ion tail.
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April 10: The comet was already looking better than expected in binoculars, small telescopes, and especially in photos, with its gas tail stretching more than 10° across the sky.
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April 9: It was becoming clear that Comet C/2025 R3 (PanSTARRS) was relatively low in dust, which cast doubt on the chances of a strong forward-scattering boost.
What is Comet C/2025 R3?
- Type: non-periodic comet¹
- Orbital period: about 160,000 years (current estimate, may still be refined)
¹C/2025 R3 (PanSTARRS) is a comet with an extremely long period, which means it spends most of its time far beyond the planets, in the distant reaches of the Solar System. Objects like this can take tens of thousands or even millions of years to return, and some visit us only once. You can learn more about different types of comets in our dedicated article.
Comet C/2025 R3: Orbit and trajectory
The orbit of Comet R3 is unusual. It is tilted by about 125° relative to the plane of the planets, which means it approaches the Sun on a retrograde orbit (moving in the opposite direction to the planets). Such steeply inclined paths are typical for comets that come from the Oort Cloud, a vast reservoir of icy bodies surrounding the Solar System.
Another intriguing aspect is the comet’s future. Preliminary calculations show its path may be so elongated that it doesn’t form a closed loop around the Sun. If confirmed, this would make the comet’s orbit hyperbolic, meaning it will swing past the Sun once and then head back out into interstellar space. In that case, April 2026 could be the only time in history when humans get to see C/2025 R3. Even if later refinements show the orbit is still bound, the period would likely be so long that no one alive today would ever see it return.
Comet C/2025 R3: Discovery
The comet was discovered on September 8, 2025, by the Pan-STARRS survey telescope in Hawaii. At the time, it appeared only as a faint 19th-magnitude speck — far too dim for the unaided eye or even amateur telescopes and visible only with sensitive CCD detectors. Follow-up observations confirmed its motion against background stars, and soon after, orbit calculations were published through the Minor Planet Center (MPC), establishing it as a new cometary body.
Pan-STARRS stands for Panoramic Survey Telescope & Rapid Response System — an automated sky survey project in Hawaii that scans the heavens for asteroids, comets, and other transient objects. The program has become one of the world’s most prolific discoverers of new comets, including C/2025 R3.
Why is the comet called C/2025 R3 (PanSTARRS)?
The official designation C/2025 R3 follows the standard comet naming convention:
- C/ — a non-periodic comet, usually on a long-period or hyperbolic orbit.
- 2025 — the year of discovery.
- R — indicates discovery in the first half of September (each half-month is assigned a letter from A to Y, skipping I).
- 3 — it was the third comet discovered in that half-month.
The suffix PanSTARRS is attached to the name to credit the survey project that made the discovery.
Scientific significance
Non-periodic comets like C/2025 R3 are pristine leftovers from the early Solar System, likely formed in the cold, distant Oort Cloud. Studying their gases and dust provides insights into planetary formation. Because R3 is on a retrograde, steep orbit, its dynamics can also inform models of how Oort Cloud objects are perturbed into the inner Solar System.
C/2025 R3 (PanSTARRS): frequently asked questions
Is Comet C/2025 R3 visible right now?
Comet C/2025 R3 (PanSTARRS) is beginning to return to view for observers in the Southern Hemisphere. It is still a difficult twilight target, very low above the western horizon after sunset, but its separation from the Sun is increasing. From the Northern Hemisphere, the comet is generally lost in bright twilight.
Will Comet C/2025 R3 be visible to the naked eye?
In theory, yes — Comet C/2025 R3 (PanSTARRS) is still bright enough for naked-eye visibility. In practice, it is much harder: the comet remains very close to the Sun in the sky and is difficult to observe. Since it has already passed peak brightness and is now gradually fading, it will probably become more of a binocular target by the time viewing conditions improve.
Has Comet C/2025 R3 been seen with the naked eye?
Yes. In mid-to-late April 2026, observer reports confirmed that Comet C/2025 R3 (PanSTARRS) was visible without optical aid under dark skies. However, it was never an easy object: the comet stayed low in the sky and moved closer to the Sun each day, so dark skies, clear horizons, and excellent observing conditions were essential.
When will Comet C/2025 R3 be brightest?
Comet C/2025 R3 (PanSTARRS) appears to have reached its peak brightness around April 26, 2026, near its closest approach to Earth. At that time, it was about magnitude 1.5. From this point on, the comet is expected to gradually fade.
Where will Comet C/2025 R3 be visible?
The best practical viewing opportunities now belong to the Southern Hemisphere. Look for C/2025 R3 shortly after sunset, very low above the western horizon. The comet is fading, but it is also moving farther from the Sun, so observing conditions should improve. In the Northern Hemisphere, the best viewing window has already closed.
Comet C/2025 R3: Summary
Comet C/2025 R3 (PanSTARRS) has already passed its peak brightness and is now gradually fading, but it remains one of the most exciting comet targets of 2026. Now the best practical viewing opportunities are shifting to the Southern Hemisphere, where C/2025 R3 is beginning to return to the evening sky. To track Comet C/2025 R3 in the sky and see when it is visible from your location, use the Star Walk 2 app.
