Re: A loss for SeeSat-L

From: Tom Wagner (
Date: Wed Jun 26 2002 - 17:03:25 PDT

From: Robert Oler

>I didn't know Bruno other then from reading his postings here.  They were
consistently informative, thoughtful, and to the point. I am sure that this
was reflective of his public and private persona.

>Its a road we all walk but what varies is the footprints we leave.


I agree with Robert. Bruno was an inspiration to many. He communicated with
me about my night vision scope and participated in observing EGP with his.

As a memorial to his contribution to this group I have copied what I believe
to be his last message to SeeSat. It is pasted below.
EGP in night vision scope
From: Bruno Tilgner (
Date: Thu Jan 03 2002 - 17:42:35 EST

Previous message: "EGP in night vision scope"

>I just observed EGP in different night vision scopes and with different
lenses. Here are the results:

I have yet another method of observing it. I use a VIXEN Skysensor 2000 PC
with a TeleVue Pronto (70 mm objective diameter, 480 mm focal length). This
is followed by a flip mirror to switch between an eyepiece and a
VIXEN B05-3M CCD video camera. The output of the camera is fed into a SONY
video walkman which has an LCD screen of reasonable size and records the
video on a small digital cassette. The whole equipment is portable
and operates on a small (12 Ah) 12-V battery. One advantage of the VIXEN
Skysensor is that one can store TLEs for up to 30 satellites. I have written
a Visual Basic program to transfer TLEs from a PC to the Skysensor in a
matter of minutes.

EGP is very easy to acquire because of its slow motion. Once I have it in
the eyepiece I flip the mirror and the flashes are then recorded on tape.
The VIXEN Skysensor takes care of the tracking, and if it is well aligned it
requires very little manual correction just by looking at the flashes on the
video screen. Because the PAL video standard allows a resolution of 1/25th
second (with special equipment one could examine half-frames every 1/50th
second) it would be possible to measure the flash frequencies which are
fairly complex indeed. The tape is very instructive for people who have
never seen EGP before and has inspired quite a few to look for it

Bruno Tilgner
48.84N 2.2E

Coincidentally, I was just wondering today if anyone would know if something
happened to a contributor. Thanks for letting us know Daniel.  It is indeed
sad news.

Tom Wagner

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