I'll start compiling these into 'volumes' in order to make them easier to catalogue and check.
Feat #1: Arisa and Kata-Tui: Planet Stoppers! (also Superman and Salaak)[]
Feat here, Action Comics Vol 1 589. Despite what the art may look like, this is frm 1987, so this is Post-Crisis material. The object is described as a planetoid, so I'll use the radius of Pluto, so that gives us a radius of 1,188.3 km. The object was completely comprised of Earth-soil, so 1600 kg/m^3.
Volume of sphere nets us 7.03×10^9 km^3, 7.03e+18 m^3
7.03e+18 * 1600 = 1.1248e+22 kg
Hal says it'll reach Earth in 12 minutes.
sqrt(1-(tan(35)*(438/630))^2/((tan(35)*(438/630))^2+1))*12,742 = 12,102.27 km (12,102,270 m)
2atan(tan(70deg/2)*[438/630]) = 0.906081623×180°/π = 51.914652892°
Angsizing yields 1.2430e+7 m
1.2430e+7 m / 12 minutes = 17,263.8 m/s
1.1248e+22 * 0.5 * 17,263.8^2 = 1.6761702e+30 J
They didnt completely stop it, but slwed it down a lot. They needed a 20% boost to send it back, so I'll aume they scale to 9% of the KE. Also divide by four. That nets us 3.7713829e+29 J
90.13 Exatons
I'll do the other calcs later.
Feat #2: John tanks a supernova[]
Feat here, Cosmic Odyssey Vol 1 2. John Stewart tanks a supernova that was immensely powerful. Was calculated here, but apparently the 'galaxy shaking' part was a chain reaction. Still, John tanked the blunt of a supernova so let's calculate that. M3X calculated the energy to be 3.57497708551999984e+52 J, and a radius of 6,371,000 meters, as the explosion seemed to come from the contact spot.
(3.57497708551999984e+52) / (4π((6371000)^2)) = 7.008873e+37 J
7.008873e+37 * 0.68 = 4.7660336e+37 J
11.39 Ninatons
Large Planet level
Edit: One thing I forgot to take into account was that Xanshi is a smol planet. I used Mercury as my bass last time. Mercury has a radius of 2,439,700 m.
(3.57497708551999984e+52) / (4π((2,439,700)^2)) = 4.7795889e+38 J
4.7795889e+38 * 0.68 = 3.2501205e+38 J (Dwarf star level)