I just re-found this impact calculator on one of the BA's review pages. You can use it to calculate impact craters on the Moon.

http://janus.astro.umd.edu/astro/impact.html

Of course, you'd have to make an estimate as to what size and composition of meteor would be comparable to the LM/SIVB sizes. I assume a 2-4 meter ice impactor might come close, but I don't know how to estimate the equivilent masses exactly. Anyone willing to help me out here?

But I came across one hitch. When I tried to imput the impact velocities I found on the page linked above (about 1.7kps for the LM's) the calculator says it's too small. The lunar gravity accelerates objects to at least the escape velocity of 2.4kps, and it won't compute anything under that. I assume the slow impact speed of the LM's is because they never reached escape velocity and got out of the gravity well in the first place, right? So the calculator is useless for simulating the LM's, though it's ok for the SIVB's, since they came in at a higher velocity.

It's a fun program, in any case.

__________________
...And that, my liege, is how we know the Earth to be banana-shaped. --Sir Bedevere

<a name="20020719.4:06"> page 20020719.4:06 aka Crater00.bas & Impactor.bas
On 2002-07-19 02:39, David Hall wrote: To: HUb' B
Many Years ago: I revised the Sky & Telescope "BASIC" program
to fit into MY TIME FRAME (this means I changed from MKS to cgs) [Mostly]
left the SI completely [step sise 1,000] { for step = Million}
and added Large crater sizes up to Obliteration ..
--some when i'll include a few lines of basic myself
For Now {in an attemt to be Helpfull} let me say that
also what i did with IMPACTOR.BAS was to turn the Problem around
& instead of solving for Crater size beginning from
Meteorite {SIZE} or (Mass) i solve for "Speed" in
Killometers per Second starting from Crater size.
I can see my error Now writing this line as Speed should be in Centimeters per Second {cgs} &Not K/s [{comprenda'}]

<font size=-1>[ This Message was edited by: HUb' on 2002-07-19 08:13 ]</font>

<a name="20020719.4:51"> page 20020719.4:51 aka {cgs} NOT [MKS]
On 2002-07-19 08:08, HUb' wrote: 4:51 A.M. HUb'
Before beginning: "REMEMBER" the Answer{s} Should be in
centimeters per second.. and not the way I did it here!
' PRELIMINARY defination table for IMPACTOR.BAS ver 98-6-23
: PI = 3.14159 ' PI : CR1 = 18 ': CD1 = 9 ': IK = 20 ' Impactor speed in Kilometers per second
: IR = 1000 ' Impactor density in ?kg/m^3 : GA = 60 ' Impactor Graze Angle of entry in degrees
: ID = 0 ' Impactor Diameter in meters : LK = 7 : CLS : INPUT " enter crater diameter in kilometers "; CD
: PRINT : PRINT " |impactor| FOR a crater of diameter = "; CD; " km "
: PRINT " |density | < assuminhg IMPACTOR SPEED OF in km/s > "
: FOR IR = 1000 TO 4000 STEP 500 : LK = LK + 2 : LOCATE LK, 2 : PRINT IR
: FOR IK = 10 TO 30 STEP 5 : LOCATE 5, IK / 10 * 20 : PRINT IK : GF = (SIN(GA / 180 * PI)) ^ .33
: KT = ((CD * 1000) / (2 * CR1 * GF)) ^ 3.333 : KE = KT * 4.2E+12 : IV = IK * 1000
: MI = 2 * KE / IV ^ 2 : VI = MI / IR : ID = ((VI * 6 / PI) ^ (1 / 3)) : LOCATE LK, IK / 10 * 20
: PRINT INT(ID) : NEXT IK : NEXT IR : LOCATE 20, 5
: PRINT " AN IMPACTOR DIAMETER SHOW ABOVE REQUIRED in meters "
HUb' 4:55 A.M. in order to get back to BASIC
replace the : (Colon) with line feed & carriage return