Subsurface temperature distributions for a layer of 10 m over a period of 1000 yr for (a) an elliptical orbit with a = 10 au and e = 0.5, (b) true-anomaly-averaged radius (﹩{\bar{r}}_{\theta }﹩), (c) true-anomaly-averaged flux (﹩{\bar{r}}_{\theta F}﹩), (d) effective thermal radius (r _T ), (e) time-averaged flux (﹩{\bar{r}}_{{tF}}﹩), and (f) time-averaged radius (﹩{\bar{r}}_{t}﹩) equivalent circular orbits.