How big was Ancalagon?

[Raynor]

Stand back, I'm gonna try science!
http://impact.ese.ic.ac.uk/cgi-bin/c...s=1&tdens=2750

Distance from Impact: 500.00 meters ( = 1640.00 feet ) Projectile diameter: 30.00 meters ( = 98.40 feet ) Projectile Density: 1500 kg/m3 Impact Velocity: 100.00 km per second ( = 62.10 miles per second ) (Your chosen velocity is higher than the maximum for an object orbiting the sun)Impact Angle: 45 degrees Target Density: 2750 kg/m3 Target Type: Crystalline Rock

The Earth is not strongly disturbed by the impact and loses negligible mass.The impact does not make a noticeable change in the tilt of Earth's axis (< 5 hundreths of a degree).The impact does not shift the Earth's orbit noticeably.

Blank template: http://impact.ese.ic.ac.uk/ImpactEffects/