In an extraordinary cosmic event captured by the Solar and Heliospheric Observatory, the second-brightest comet C/2023A3 (Tsuchinshan-ATLAS) observed by SOHO revealed its bright nucleus and massive dust tail. During intense solar activity, the comet displayed a unique "anti-tail" effect as it moved away from the Sun, becoming increasingly dimmer in the western sky.

NASA astronaut Matthew Dominick used a high-sensitivity camera on the International Space Station to take long-term photos of comet C2023-A3, which is about 99.4 million miles away from Earth. Image source: NASAFrom October 7 to October 13, 2024, the ESA/NASA Solar and Heliospheric Observatory (SOHO) spacecraft captured stunning images of comet C/2023A3 (Tsuchinshan-ATLAS), which is the second brightest comet observed by SOHO. During the same period, the Sun was ejecting massive amounts of material, visible in the center of the frame, while the planet Mercury appeared on the left. The comet's bright nucleus is surrounded by dusty tassels and trails a long, curved tail. SOHO's vantage point allows it to see the edge of the dust tail bent by the solar wind.Source: SimeonSchmauß&SOHO(ESA&NASA)

Towards the end of the video, a rare phenomenon known as an "anti-tail" - a thin line pointing toward the sun - can be seen. This optical illusion occurs when SOHO observes larger dust particles in the comet's orbital plane from an edge-on perspective.

Comet C/2023A3 was first observed early last year. It most likely comes from the distant Oort cloud.

The comet is estimated to have reached a peak brightness of just over -4 magnitude. (Among the more than 5,000 comets observed by SOHO that fly past the sun, only comet C/2006P1 (McNaught) is brighter, reaching magnitude -5.5.

SOHO gets a front-row seat since it's located between the Sun and Earth, but the same comet has been visible from Earth every night since October 12, 2024. Throughout October, the comet will gradually dim and rise higher in the western sky as it moves away from the Sun.

During the week SOHO observed Comet Tsuchinshan-ATLAS, space weather was also very frenetic. The sun unleashed no fewer than four X-class flares (the most powerful type of flare), 28 moderate-intensity M-class flares and 31 coronal mass ejections - the latter of which can be seen in the video as a white cloud of material. All this activity resulted in two geomagnetic storms on Earth, which lit up the night sky with beautiful auroras.

SOHO, short for the Solar and Heliospheric Observatory, is a mission jointly conducted by ESA and NASA to study the sun. For nearly 29 years, it has been observing the Sun itself as well as the much dimmer light from the Sun's outer atmosphere, called the corona. The data in this video was captured by the LASCOC3 coronagraph.

Special thanks to Simeon Schmauß, who processed the raw data to produce this impressive video. For comparison, here's a video of the comet with more standard data processing - the comet was so bright that it partially saturated SOHO's sensors.

Compiled from/SciTechDaily