Definition of "Thule"

I have reached these lands but newly // From an ultimate dim Thule.

1844, Edgar Allan Poe, The Works of the Late Edgar Allan Poe II (1859), “Dream-Land”, page 41, first stanza, lines 5–6

For distant India tremble may // Beneath your mighty rule, // And Thulé⁵ bow beneath your sway // Far in the Northern sea, // But if to care and want you’re prey, // No king are you, but slave.

1969, V.E. Watts (translator), Boëthius (author), The Consolation of Philosophy, bk III, ch. v, page 89

5. To the Romans Thulé, variously identified as Iceland or Mainland in the Shetland Isles, marked the extreme northern limit of the known world, just as India here stands for the farthest east.

ibidem, footnote 5

For the purposes of discussion, MU69’s larger and smaller lobes have been informally designated “Ultima” and “Thule,” respectively, by the New Horizons team. Ultima and Thule have best-fit measured diameters of ~19.5 and ~14.2km, respectively, with errors of only a few percent at this time.

2019 January 24, Stern, S. A., J. R. Spencer, H. A. Weaver, C. B. Olkin, J. M. Moore, W. Grundy, R. Gladstone et al., “Overview of initial results from the reconnaissance flyby of a Kuiper Belt planetesimal: 2014 MU69”, in arXiv‎

Ultima and Thule have similar colors with measured albedos ∼0.06, indicating that UT is a typical member of the Cold Classical Kuiper Belt class of objects.

2020, Umurhan, O. M., J. T. Keane, R. A. Beyer, M. Bird, I. Linscott, S. B. Porter, J. R. Spencer et al., “Thermophysical, Gravitational, and Geomorphology Properties of 2014 MU69”, in Abstracts of the 235th AAS Meeting (Honolulu, HI), page 717