recalculated this due to a debate on discord, via handcount of all the planets and some math.
3 size 3 (garnir, nomios, kanni)
18 size 4 (asharu, derinkuyu, nortia, skathi, arcadia, kanta's den, olinadu, orthrus, tigra city, cethlenn, donn, epiphany, laicaille, kapteyn, thulian raider base, lost astropolis, port tse, athulf)
25 size 5 (ancyra, cruor, umbra, baetis, hesperus, raesvelg, ragnar complex, agreus, tibicena, nova maxios, coatl, sphinx, salamanca, qaras, culann, asher, chalcedon, nachiketa, eldfell, mairaath, ilm, yesod, suddene, ailmar, cibola)
5 size 6 (jangala, eochu bres, yama, fikenhild, madeira)
7 size 7 (sindria, volturn, tartessus, eventide, gilead, kazeron, mazalot)
1 size 8 (chicomoztoc)
minimum:
3 * 10^3 + 18 * 10^4 + 25 * 10^5 + 5 * 10^6 + 7 * 10^7 + 1 * 10^8
= 177,683,000
maximum:
3 * 9.999 * 10^3 + 18 * 9.9999 * 10^4 + 25 * 9.99999 * 10^5 + 5 * 9.999999 * 10^6 + 7 * 9.9999999 * 10^7 + 1 * 9.99999999 * 10^8
= 1,776,829,941