In the world of astronomy, few discoveries still manage to really surprise. But when it is Gennadiy Borisov to sign the sighting, something extraordinary is always to be expected. The Ukrainian star, already known for having discovered the first real interstellar comet in 2019 (2i/Borisov), returned to the limelight in May 2025 with the reporting of a new celestial object that has left even the most experienced scientists: C/2025 J1 (Borisov).
This comet, captured between 2 and 3 May at the Personal Observatory of Borisov in Crimea, stands out for a series of characteristics really out of the ordinary. So much so that some astronomers did not hesitate to call it “almost interstellar” 535 million kilometerseven more distant than the orbit of Mars.
Why does this comet intrigues so much?
C/2025 j1 It is not an ordinary comet. According to the official data of the Jet propulsion laboratory (NASA)its orbit has an inclination of about 95.4 ° Compared to the plane of the Solar System, which means that the object does not move following the usual flat and circular trajectory, but the system penetrates as a vertical blade. A real anomaly, which led someone to compare it to an intruder in a well -organized party.
But that’s not all. His too orbital eccentricity – that is, the measure of how much the orbit is elliptical or hyperbolic – it is extreme: equal to 1,00069617. This value suggests that C/2025 j1 it could actually have an open orbit, that is, not closed around the sun, which would rank it as Object out of the Solar System. It is not said that it comes from other star systems such as the famous 2i/Borisov, but we cannot even exclude it completely.
The closest approach to the sun, known as periheliontheJune 11, 2026. However, contrary to the most spectacular comets that crown the sky near our star, this will remain at a great distance. Its maximum brightness will be very lowestimated between magnitude 17,2 and 17.7making it invisible to the naked eye but observable with medium or large opening telescopes.
Anyone who has a telescope and alive in the northern hemisphere will have time untilAugust 2026 to try to intercept it in the night sky, in particular in the area near the Polar stara detail that makes it even more interesting from an observational point of view. After this date, the comet will move to the southern hemisphere, where it will remain visible until the part of the 2027.
This Longevity of observation It is a rarity in the world of comets, which usually shine briefly and then dissolved. Scientists hope to monitor c/2025 j1 for many months, analyzing their activity, chemical composition and variations in its tail.
A letter sealed by deep space
Comets are often defined “messengers of the primordial solar system“, Real natural archives of ancient matter. Each passage allows us to access fundamental information on the origin of the planets and the chemical composition of the deep space.
In the case of C/2025 j1his anomalous orbit raises fascinating questions: it could be a wreck from the Oort cloudpushed inland by distant gravitational disturbances, or an object formed in a region never explored of our own system. In any case, it is a precious celestial body, capable of telling stories still all to be deciphered.
And just as we aim our eyes and our probes on Mars or on the exoplanets in search of traces of life, comets like this remind us that there are still enormous mysteries right under our cosmic noseand that sometimes it is the unexpected to open the doors of knowledge.
