Interstellar comet 3I/ATLAS in the Martian sky.
Source: NASA/JPL-Caltech/ASU/Simeon Schmauß

On October 3, interstellar comet 3I/ATLAS flew past Mars at a distance of 30 million km. NASA and ESA deployed spacecraft studying the Red Planet to photograph a visitor from another star system. The Perseverance rover was among them. It took a series of images of the Martian sky in an attempt to capture the comet.

Due to the US government shutdown, NASA is currently unable to make any official statements regarding the results of its observations of the comet. However, amateur astronomer Simeon Schmauß used publicly available images of Perseverance to find it. To do this, he processed and stitched together twenty images taken with a 30-second exposure set on the rover’s Mastcam-Z camera.

Interstellar comet 3I/ATLAS in the Martian sky.
Source: NASA/JPL-Caltech/ASU/Simeon Schmauß

In the final image, you can see a faint cloud of 8th magnitude. This is the interstellar comet 3I/ATLAS. Despite its relative proximity to Mars, it cannot be seen from its surface with the naked eye. This is because the vicinity of Mars receives 2.5 times less sunlight than Earth. Therefore, the activity of 3I/ATLAS is much lower than it could be if the comet were closer to the Sun. Furthermore, contrary to speculation by ufologists, its core is not particularly large.

Interstellar comet 3I/ATLAS in the Martian sky (annotated version).
Source: NASA/JPL-Caltech/ASU/Simeon Schmauß

It is also worth noting that many online resources have begun publishing images taken by Perseverance’s navigation camera, which show a bright elongated object, claiming that this is the interstellar comet 3I/ATLAS, and that the absence of a tail means that it is of artificial origin. However, this is a deception. In reality, these images show Phobos, which was captured in the frame at the moment of shooting. It is bright and moves at high speed across the Martian sky, which creates a “smeared” effect.

An image of Phobos captured by the Perseverance rover’s navigation camera, which is being passed off as a photograph of an interstellar comet.
Source: NASA/JPL-Caltech/ASU

Just a reminder that comet 3I/ATLAS will reach the perihelion of its orbit on October 29. At that moment, it will not be visible from Earth. However, it will be observable by the European JUICE spacecraft, which will be in a suitable position for this.