NASA has officially communicated what the object I have reported is. The strange-looking geometric “object” is actually a reflection of the planet Venus within the telescope lens. This effect signal, has been seen in the past many other times. The answer to the following LINK
STEREO stands for Solar TErrestrial RElations Observatory. It was built by NASA and launched on October 26, 2006.
STEREO has two satellites, also known as probes, which work together to watch the sun. They are in an orbit around the Sun (heliocentric), in effect almost the same orbit of the Earth, but a probe is in front of the Earth (STEREO-A) and one is behind the Earth (STEREO-B). Two big eyes looking at the sun! The two STEREO probes slowly separated for most of the mission, so in January 2008 they were 44 degrees apart.
The two parts making up the STEREO mission were launched at 00:52 UTC on 26 October 2006 on a Delta II 7925-10L carrier from launch base 17B at the Cape Canaveral Air Force Station in Florida; after launch, the two orbiters took on a highly elliptical geocentric orbit, the apogee of which extended to the orbit of the moon. On December 13, 2006, during the fifth orbit around our planet, the couple moved away from our satellite due to the gravitational slingshot effect.
They will continue to separate as the mission progresses. This means that we can observe the Sun and the CMEs from 2 different perspectives in space. From these observations, it is possible to make 3D images and videos.
Often the probes have provided images of unknown flying objects that have passed through the Crown of the Sun, but this time they have traced something truly unique.
Here is this video on line and my monitoring of the object, about 3 times our planet, by eye and cross 30000 km in diameter, to you the necessary considerations.