On Sunday, December 3, 2017 at 8:28:06 PM UTC-8, Mike_Duffy wrote:

... I was not aware of any objects with a smaller perihelion than
Mercury.

My point re-phrased should thus have had something to do with an estimate
of the fraction of the known objects in the Solar System that have
perihelion less than 'Oomuamua.

Well, Sun-grazing comets can come *very* close to the sun and survive, although many of them do not...

https://www.space.com/30315-sungrazi...fographic.html

https://en.wikipedia.org/wiki/C/2011_W3_(Lovejoy)

https://www.space.com/23780-comet-is...-roasting.html