alternative attack with satellites

another alternative attack would be the "three satellit sister attack".
let me explain. during the cold war russia , formaly known as the Soviet Union, launched a huge amount of satelitttes. most of them were even used today.
but there's also a not well known number of abandoneds which doesn't full fill any task. so if we crack into these satelittes we could adjust the orbit to reroute it onto the earth. Well one satelitte is small and would get burned in the earth athmospehre, so we adjusting 3 or 4 sattelites in a row. If the first or even the second get burned there are even the two others. because they are "travelling" in the shadow of the first two. normal military spectators would recognize these two satelittes as one, so even if they defeat one, they would befaced with the next one in that row. this chain of sattelittes couldn't get extended to far because at a critical point you would recognize some parts of the end of that "satelitte row".
the bad part of this technique is, that it isn't so effectivly. you can't crush citys/landscapes with it. but you can destroy expensive unit like aircraft carriers or stand alone buildings like the white house. those this whole satelitte story is some sort of "lancet attack".
think of the end of the russian space station "mir"

Asteroid Calculator

Asteroid calculator.
http://www.lpl.arizona.edu/impacteffects/
Here's an easier prettier one.
http://simulator.down2earth.eu/#

These let you find out the effects at any given distance as based on different scenarios.

Phase One - FireStorm

Agreeing w/Stick and some of the others...

Perhaps the Nazis may organize a super station, ionizing the the satellitic space garbage into hail to simulate 'firestorms' 'blitzes' etc on urban targets...

it may be more believeable, cost-effective, and it might clear the troposphere for a massive invasion...

400,000 Meter Drop = 35 Meter Rock

If you accept the 400,000 meter drop for a 8.370 x 10^13 J impact in my previous shot, then here are some further numbers:

Assuming the rock came from the moon, average lunar density = 3.4 gm/cm^3.

Further assume the rock is roughly spherical. Then we can use this web page to calculate the effects of friction, arriving at an impact speed and the mass and radius of the rock:

http://hyperphysics.phy-astr.gsu.edu/Hbase/mechanics/fallq.html#c1

This tells me that the moon nazis need a rock with mass 76,327,612 kg. Assuming I didn't drop a decimal place (I'm working on something else right now) this rock will have a diameter of about 35 meters. That size should look good when towed by the flying saucers shown in the Iron Sky trailer.

Note that the calculation accounts for friction, but it does not account for ablation. I assume the rock will neither burn nor crumble while falling.

The rock's terminal velocity is just 5,480 km/hr. This is a fraction of the velocity of a re-entering spaceship (at least 27,400 km/hr) so the rock does not need to burn very much. The 5,480 km/hr wind may cause it to crumble a bit, but even the crumbs will hit the target pretty hard. If you want to show bits of the rock breaking off as it falls, start with a slightly bigger rock.

If you want the moon nazis to drop from an even lower altitude then start with a much bigger rock.

Orbital Altitude, but NOT Orbit

Neither dropping the stones from orbit nor diverting asteroids would be optimal strategy for the moon nazis. Assuming they have anti-gravity technology, their best strategy is to simply hover over the Earth and release the stone a few minutes before the target city rotates beneath them.

This makes aiming easy while reducing the energy absorbed by Earth's atmosphere, since the stone will start at hovering v = 0 kph instead of orbital v = 27,400 kph.

In quick, rough terms:

Suppose the moon nazis want to hit the city with the same energy as the Hiroshime bomb, about 8.370 x 10^13 Joules. If they want a rock to hit a city with with that much energy, when they drop it the rock must have at least that much potential energy.

PE = mgh
solving for mass:
m = PE/(gh)

Let's give the moon nazis two simple scenarios. In the first they want to release the rock from a high altitude of 2,000,000 meters.

(8.370 x 10^13 J)/(9.8 ms/s*2000000 m) = 4,270,408 kilograms.

In the second scenario the moon nazis want to drop a bigger rock from a lower altitude of 400,000 meters:

(8.370 x 10^13 J)/(9.8 ms/s*400000 m) = 21,352,040 kilograms.

Note that I have assumed a rock of infinite density so friction will be ignored. I leave it to you to decide on the density of the rock the moon nazis will choose.

I think the second scenario is better because:

a) It starts with a bigger rock closer to Earth, appearing more terrifying.
b) The rock will be visible from the ground for a longer time, again more terrifying.
c) The bigger rock needs less velocity, so friction is less of a factor.

In my next message I'll go into more detail.

Earth - The White Planet

With respect,

The Nazis, might consider earth to be the White Planet and their #1 priority might be to conserve the White climate while wiping those 'darker' races from the world.

Dropping Nutrino grade materials might not be considered very Nazi and might therefore work against the IronSky comedy.

Get a asteroid...

I think the Nazi should not try to bring a rock from moon, but try to divert a asteroid from somewhere else. Their spaceship are good enough to interplatenar travel besides between Earth and Moon. Also this needs to be prepared a few years in advace. With small correction just before.
A 200 m dark rock could not be detected by Earth astronomers until a few week or even a few days before the impact. Also it could come from another direction an the moon, so that it could be hidden that it is an artificial impact.
That why a high impact angle can be achieved creating a huge explosion.

How about a Near-Earth-Object instead?

46P/Wirtanen "could reach naked-eye visibility during its 2018 return. With perihelion falling on 2018 December 12 and the comet passing 0.0776 AU from Earth just four days later"
http://cometography.com/pcomets/046p.html

Its diameter is estimated at 1.2 km!
http://en.wikipedia.org/wiki/46P/Wirtanen

If I were a SpaceNazi, I'd rush on over to that comet, break it into a bunch of smaller fragments, and send 'em on their way to rain death & destruction upon my enemies!!!

Alternately there would be Asteroid 2008 BT18, due to pass earth at a distance of 0.14 AU in april 2018.
http://en.wikipedia.org/wiki/2008_BT18
Actually a double-asteroid with one being 600m, the other 200m in diameter. http://www.spiegel.de/wissenschaft/weltall/0,1518,565575,00.html
Maybe the smaller part of this double, is actually a nazi-UFO prepping it for mayham?

Meteor Hits

This is just the basic information I found at NASA

Meteor diameter - 160 m
Yield (Megatons) - 10 -100
Consequences - irons,stones hit ground; comets produce airbursts; land impacts destroy area size of large urban area (New York, Tokyo)

As others have already mentioned, it would be easier and more practical for the Nazis to find the appropriate rock already in space. They could then use small explosions to aim the meteor. When it's close enough to Earth a ship can be used to make the aim more precise. Even if the meteor crashed into the ocean near New York the tsunami it would produce would certainly wipe out the city.

Impact effect calculator

Here's an impact effect estimator to do all that pesky maths included in the equations:

http://www.lpl.arizona.edu/impacteffects/

It also gives some kind of estimation about the different phases of impact, eg. when the rock starts breaking up in the athmosphere, and what will happen in a given distance from the impact and when.

"Your position was inside the transient crater and ejected upon impact"

Bad luck...