This is only tangentially on topic, but since the Solar Helioscopic Observatory was launched almost 20 years ago it has discovered over 3000 comets, approximately one every 2.6 days, most of those are in a terminal death spiral, which is extremely eccentric and elliptical. Those who don't burn up generally won't come back for thousands of years, only a few hundred comets out of possibly trillions actually are known as periodic, ie their orbit is stable enough and they will return regularly.