https://Spaceweather.com 2017 Nov 20 published an update on this once in a Solar Sytem (SS) Lifetime event (a small exaggeration), a near miss by an interstellar asteroid. The thing was about 400 meters long and looked like a cigar. It was made of metal and rock and was spininning around its vertical axis once every 7.3 hours. We first saw it after it had already rounded the Sun and was on its way out of the SS. It missed the Earth by about 15,000,000 miles. The Sun for comparison is only 93.000,000 miles away.
Picture below is an artist's concept and is credit spaceweather.com. See above link for the full story and an animation of the event..
