At the first light of the morning, when the sky still has to choose whether to remain night or become day, C/2025 R3 (PanSTARRS) still passes there. We are looking for it from Italy down to the eastwith a clean horizon and a little luck. The most mocking part of the story is all here: the comet has already reached a brightness capable of taking it up tonaked eye under really dark skies, and right now it has become more uncomfortable to observe, squashed close to the Sun and bathed in the dawn glow. Al April 21, 2026 is found in Fishshines around the magnitude 3.4is approximately 0.50 astronomical units from the Sun And 0.51 from Earthwith aelongation of 16.2 degrees. So the comet is there, and it is also bright. The problem now is all in the position.
The most important step came on April 19, 2026 at 11:28 pm local timewhen C/2025 R3 reached the perihelion about 0.49 astronomical units from the Sun. The closest approach to the Earth remains set for April 26around 0.48 astronomical units. Estimates spoke of a maximum brightness close to magnitude 3.5 in the basic scenario, with more optimistic hypotheses capable of going much higher. The really useful part for those who look at the sky fromnorthern hemisphereincluding Italy, fell until April 18-19in the 45-60 minutes before sunriselow on the eastern horizon. In those conditions a 10×50 binoculars remains the most sensible instrument, while a small telescope adds something more. Under very dark skies the comet has also entered naked eye territory, although binoculars continue to remain the best choice.
Now the picture is changing quickly. Between the April 20th and 25th the comet may still remain close to its peak brightness, yet it becomes more difficult to follow from Italy because it slips further and further into the dusk. After the April 25th the solar glare makes it practically almost lost to northern observers. In the’southern hemisphere the opposite happens: until April 20th it remains an uncomfortable objective, then between late April and early May the most interesting phase arrives, with the comet in evening sky and a more favorable separation from the Sun. At the beginning of May it could still be around the magnitude 4therefore clearly visible in a 10×50 and still reachable with the naked eye under clear skies; by the end of May it should fall to around magnitude 9 or 10, becoming primarily a telescope target.
In recent days C/2025 R3 has also changed its face quite quickly. The April 17 reports arrived confirming the visibility to the naked eye in good dark conditions. The April 16 the tail appeared wider and more spread out and began to show faintness anti-tailthat is, that rare perspective effect that makes it seem like a small appendage pointed towards the Sun.April 11th new images suggested a more complex structure, with two distinct elements in the ionic tail. The April 10th the gaseous tail exceeded i 10 degrees in the photographs. The April 9th An important detail had also emerged: the comet appeared relatively low in dust, and this cooled expectations about a possible spectacular increase in brightness linked to forward scattering. The April 20thimmediately after perihelion, the balance remained positive: brilliant comet, in line with expectations, without the sensational explosion that some had hoped for. In one of the best-known images of these days, taken on April 18 above the castle of Kunětice in the Czech Republic, a fireball crossed the sky right next to the comet.
April remains the month to follow most carefully
The April route is the one that concentrates almost everything. At the beginning of the month the comet entered the Great Square of Pegasus and went through it in about a week. The April 17 it passed within approx 2 degrees from the galaxy NGC 7814. The April 19th she slipped from Pegasus to the Fish and, in the same sector of the sky, the observers also had the company of Mercury, Mars, Saturn and Neptune in a parade of four planets. The April 24 C/2025 R3 makes a brief foray intoAries. The April 25th enter Cetusin a now difficult phase for the North because it is too close to the Sun. Il April 29 leaves Cetus and moves to Bullwhere it remains until the first days of May.
May brings a weaker comet, but very interesting especially for those who photograph the sky. The May 1st enter Eridano. Between the 7 and 8 May passes between the Witch’s Head Nebula And NGC 1788. THE’May 8th arrives in Orion and between May 10th and 12th approaches within approx 2 degrees at the Orion Nebula. The May 16th crosses the border withUnicorn. Between the 23 and 25 May passes within approx 1 degree from the Red Rectangle Nebula. For those who live in southern latitudes, the most satisfying part of the passage begins here.
Even the Moon decides a lot. The most favorable phase of this spring fell around New Moon on April 17thwhich gave us the darkest sky just as the comet was getting really interesting. There Full Moon on April 2nd made the search more tiring, that of May 1st will do the same. The First Quarter of April 24th adds background light in the evening part, while the May 9thwith theLast Quarterconditions begin to improve again. For those who try to observe it now, the best hours are those in which the Moon has already set and the sky still retains some true darkness.
It comes from very far away and may never return
C/2025 R3 is classified as non-periodic comet. The current estimate of the orbital period revolves around 160,000 yearswith margins still susceptible to refinement. The orbit is inclined by approx 125 degrees relative to the plane of the planets, so the comet moves in the direction retrogradein the opposite direction to the planets of the Solar System. This type of trajectory is typical of objects arriving from Oort cloudthe large reservoir of icy bodies surrounding the outer Solar System. The NASA JPL database also classifies it as Hyperbolic Comettherefore with a trajectory that could also prove to be open: one pass and off we go. If the calculations confirm this solution, 2026 will remain the only useful transit in human history. Even in the case of an orbit still linked to the Sun, the times remain so long as to make any idea of a return completely out of scale for us. From a scientific point of view, the value lies precisely here: these comets preserve very ancient material and help to better understand the formation of planets and the way in which Oort Cloud objects are pushed towards the inner Solar System.
The discovery dates back toSeptember 8, 2025. The new body was identified in the program’s images Pan-STARRS at Hawaiiinitially as a very faint object around the 19th-20th magnitude. Subsequent observations confirmed the movement relative to the background stars and the Minor Planet Center formalized it as a new comet. Even the name tells the bare minimum: C/ indicates a non-periodic comet, 2025 it is the year of discovery, R postpones to the first half of September, 3 reports that it was the third comet discovered in that period, while PanSTARRS credits the survey program that found it. The Pan-STARRS project, developed and managed by the Institute for Astronomy at the University of Hawaii, is a wide-field imaging system designed to scan the sky and intercept moving objects such as asteroids and comets.
