On 3 , april 2000 the   UAI Lunar Section reported a short note   concerning a suspect event in Oceanus Procellarum near to the craters Landsberg and Reinhold.

The GLR group on 8, april 2000 reported the interpretation  that the white spot is clearly an reflex or an high albedo feature . In our images presented in the GLR site there are several features having high albebo (f.e to the NW of Reinhold,  SW of Reinhold, E of Landsberg).

In this communication he reported the theory of the mirror reflection.

The presence of smooth region can produce a mirror effect due to the rays of the sun.
This effect will depend by the geometry of the earth-moon- sun.
 

In the mathematical model performed by Dr. Carbognani (http://www.fis.unipr.it/~albino/documenti/luna/tlp1/TLP1.html)

the condition of the TLP, due to the mirror reflection, is depending from several parameters :

-longitude subsolar

-longitude of the lunar region

-angle of phase.

It is evident that will be necessary also to study  the composition of the smooth lunar surface. This consideration is valid in order to explain the segnalation carried out by L. Vazzoler ( white spot near to the Landsberg crater).

 The paper performed by Dr. Carbognani is in agree with the our preceding conclusion.

In fact, the mirror reflection of the solar radiation could explain some suspect events. In the table below are reported the regions of probable effect mirror at specific Angle of phase (from Carbognani's model).
 
 Table and relation
 

Angle Phase	age	phase	Lambdasub	Lambdatlp	region
135°	03d 16h	0.15	135° E	67.5° E	Mare Foecunditatis NE
90°	07d 09h	0.50	90° E	45° E	Mare Foecunditatis NW
45°	11d 01h	0.85	45° E	22.5° E	Mare Tranquillitatis south
0°	14d 18h	1.00	0°	0°	Sinus medii
45°	18d 10h	0.85	315° E	337.5° E	Mare Insularum
90°	22d 03h	0.50	270° E	315° E	Oceanus Procellarum center
135°	25d 19h	0.15	225° E	292.5° E	Oceanus Procellarum W

 

The our researches also are in agreement.
The results could to fit under latitudes within in +/- 10 ° from the equatorial area.
We have individuated several areas of interest for lunar observer as shown below:

age            features

3d16h                   Langrenus, Webb, Apollonius
7d09h                   Tauruntius, Goclenius, Gutemberg, Messier
11d01h                 Arago, lamont, Ross, Sabine, Hypatia, Teophylus
14d 18h                Higynus, Triesnecker, Reamur, Rhoeticus
18d 10h                Landsberg, Reinhold, Fra Mauro
22d 03h                near kepler, Flamsteed, Letronne
25d 19h                Grimaldi, Hevelius, Cavalerius

Conclusion: We thanks all the GLR observers for the TLP researches and Albino Carbognani for the interesting paper which supports our studies.

The researches about the mirror effect and the composition of the smooth lunar  surface are still in progress!

A conclusive report will be done!

Rome 12 april 2000