05 September 2025

Comet 3I/Atlas & Solar Activity: 4 - 5 September 2025

SpaceWeather

We've got another nice recording of Comet 3I/Atlas! 

This visitor continues to confound the experts because of several peculiarities it possesses. In this SpaceWeather article, two are mentioned ~ the carbon dioxide-rich ratio and the Sun-loving tail. Here's what they said about the tail:

Normal comet tails are blown away from the sun by solar wind and radiation pressure. 3I/ATLAS’s tail points toward the sun--a twist that astronomers don't fully understand

There's still no clear indication of its size although Nasa (Never A Straight Answer) says that Hubble images have enabled them to make this estimate:

The upper limit on the diameter of the nucleus is 5.6 kilometers, though it could be as small as 320 metres across, researchers report.

Here for more details.


Meanwhile, Gregorio M Vigilante del Sol has some fascinating images of our Sun:

Gregorio M Vigilante del Sol


We had some short bursts of geomagnetic storms a couple of days ago:


Perihelion Solar Activity & 3I/Atlas Update

SpaceWeatherLive We have CMEs galore around 3I/Atlas' perhelion on 29 October 2025 ~ here are some examples for each day between 28 Octo...