One of the great protagonists that we have in the sky right now is the comet 3I/ATLAS that has received attention both from science and from fans of everything that surrounds us beyond the atmosphere. And what makes this comet be very interesting It is precisely its origin that does not belong to our environment and also that after its passage it will never return. This makes seeing it from Earth be something unique and that no one will ever be able to repeat again.
Getting closer. Right now we are on the verge of its peak moment with us: its closest approach to Earth will occur next week, and this makes many people want to have an idea of how to witness its passage. The appointment will be next December 19.
An impossible trajectory. To understand what we are seeing, we have to look back a couple of months. Orbital calculations placed this comet at its closest point to the Sun at the end of last October, passing slightly inside the orbit of Mars. And this was where we had the first big meeting.
On October 2, the HiRISE camera aboard the Mars Reconnaissance Orbiter (MRO) managed to photograph to the comet from a distance of about 30 million kilometers. It is not common for us to have “eyes” on another planet watching for comets, but the geometry was perfect to capture and visualize it. And all these images have been fundamental to know exactly how and when it will reach our environment.
How and when. The date to mark on the calendar is December 19, 2025. A Friday that will be historic since it will be the moment in which 3I/ATLAS makes its closest approach to Earth, being at a distance of 270 million kilometers. Something that removes any type of risk of impacting the planet.
The eyes are useless. Looking up and seeing the comet will not be possible, but you will need to be minimally equipped since it does not have colored tails or anything similar. That is why you will need to have a medium or large caliber telescope that is capable of capturing a lot of light.
All this accompanied by dark skies, since light pollution in cities makes its detection impossible due to its low brightness. In addition, it is important to have tools such as mobile applications that can guide us where to aim in order to know where we will see it. Although it is also important to have the NASA information about its location.
The best sites. In the northern hemisphere, which is where we are, the comet will be visible before dawn. But to do this it will be necessary to also find the best places with dark skies and no light pollution.
Traditionally in Spain we can have different characteristic sites such as the Teide observatory or mountain ranges that are very high like in the Pyrenees to be in optimal conditions to see it. Likewise, online monitoring through large observation centers can also be an option in the event of not having the appropriate equipment or location.
Images | THAT
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