# UNID crossing the Moon

From: Giuseppe N. Gerbore (giuseppegerbore@virgilio.it)
Date: Wed Oct 12 2011 - 15:24:27 UTC

• Next message: Björn Gimle: "Re: UNID crossing the Moon"

```Yesterday night I captured by chance something crossing the Moon:

Seems to me a satellite, but .. let us do some calculation:

Data:

Image angle                4''

Captured path             15'

Transit time                1.93s

By using the approximate relation: sin(A)=Diametre/Range:

1) Plane (D=50m)                  Range             =50/sin(4'')                 =2 578 310 m

Path                =50*60*15/4              =      11 250 m

Velocity          =11 250/1.93              =       5 829 m/s

2) Satellite (D=10m)             Range             =10/sin(4'')                 =   515 662 m

Path                =10*60*15/4              =       2 250 m

Velocity          =2 250/1.93                =       1 165 m/s

3)Bird (D=0.3m)                    Range             =0.3/sin(4'')                =     15 469 m

Path                =0.3*60*15/4             =          67.5 m

Velocity          =67.5/1.93                  =         34.9 m/s

4) Mosquito (D=0.005m)       Range             =0.005/sin(4'')           =           257 m

Path                =0.005*60*15/4         =        1.125 m

Velocity          =1 125/1.93                =          0.58 m/s

Velocity assumed at right angle with line of sight. Might be much more if object approaching or moving away from the observer.

Am I talking complete nonsense?

Giuseppe

Casa, 44.64°N, 10.90°E, 57m asl.

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