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The original calculation uses effects from before George Lucas added changes to the series, so I'm going to see if it yields higher results in the updated version.

The reason I'm averaging the two values is because the planet's fragments do not move at the same speed.

Calculation

Average Distance

Alderaan = 278 px / 12,500,000 meters

Panel Length (from Alderaan center) = 1455 px / 65,422,661.8705 meters

Panel Height = 815 px

2*atan(tan(70/2 deg)*(278/815)) = 0.468902925 radians, or 26.866158603906 degrees

Plugging these results into the Angular Size Calculator gets 26,168,000 meters

(65,422,661.8705 + 26,168,000) / 2 = 45795330.9352 m

Kinetic Energy

The explosion started at 2:09 and reached the edge at 2:11, or 3 seconds

45795330.9352 / 3 = 15265110.3117 m/s

(0.5)(5.972e+24)(15265110.3117^2) = 6.9580845e+38 J

Speed

Using the afformentioned site and playing the clip at 25 fps, the beam starts at ~3176 and hits the planet at ~3221, or 45 frames

45 / 25 = 1.8 sec

26,168,000 / 1.8 = 14537777.7778 m/s

Final Tally

Death Star I hits Alderaan = 26,160 Kilometers (Planetary)

Death Star I reaches Alderaan = Mach 42,384.191772 (Sub-Relativistic)

However, they say the Death Star's beams fire at FTL speeds in the Catalyst Novel

  • Computer modeling showed the lasers’ twin collimating beams racing away from the Star Destroyer. Then, captured by gravity, the beams become one, changing vector and accelerating beyond lightspeed as it disappeared into the mask’s churning accretion envelope.

Death Star I Firepower = 1.6630221e+29 Tons of TNT (Dwarf Star level)

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