Mars' orbit: semi-major axis a=1.52 AU, eccentricity e=0.0934, obliquity=25.19 degrees. Albedo = 0.15

Puzzler 2: What is the temperature at the subsolar point at (a) aphelion~N.summer and (b) perihelion~S. summer?

Distance from the Sun at aphelion = a (1+e) = 1.52 x 1.0934 = 1.66 AU

Distance from the Sun at aphelion = a (1-e) = 1.52 x 0.9066 = 1.38 AU

So, the equilibrium temperature at the subsolar point is Teq = 288 K(1-A)^1/4/(distance)^1/2 = 276 /(distance)^1/2

(a) at aphelion = 215 K

(b) at perihelion = 235 K

9% seasonal variation

You could add 5K of green house effect to both of these.