How large of a mirror would be needed to warm Titan up to ~290K?
Paul Birch in his paper "Terroforming Mars Quickly" calculated a mirror size of:
Support Mirror: 2.5 x 10^7m radius 3x 105m wide
Distance: between .91 x 10^8m perihelion and 1.09 x 10x10^14m2 aphelion.
4.6piR^2 ~ 1.7x10^ x 14m^2 with a mass of 5x10^10kg (55.12 short tons).
Lens 400km above the surface, 460km radius
Source: https://www.orionsarm.com/fm_store/TerraformingMarsQuickly.pdf (p. 4 -6 of PDF).
I understand that Titan has a thicker atmosphere + smaller land area and I don't know how to account for that.
Also, I understand you may only need small mirrors to warm smaller areas (i.e. not the whole planet). Is this viable given how thick Titan's clouds are?