[stormer]

Based on its magnitude I saw an size estimate of 50 km. If it is a sphere its volume would be 1.33*3.14*(25^3) or about 65,000 km^3. Assuming its mass is the same as water, we get 6.5*10^13 metric tons (I think). With little atmosphere to impede or ablate the comet, if it hits, it may be quite the show. I’ll leave it to someone else to do force and energy calculations.

[SgtHooper]

And it may kick out debri in our direction. That WOULD be interesting.

[rmichaelj]

If it is an ice comet- could leave a bit of water and thicken up the atmosphere (a microspoic amount). A Mud puddle on mars would be cool (but given the thin atmosphere would evaporate quickly.

[T. P. Pole]

Assuming its mass is the same as water

Now, now, we all know the density of a comet is the same as a hot fudge sundae.

[Errant]

I’ll leave it to someone else to do force and energy calculations.

2×10¹º megatons

:)