Re: ISS Solar Transit

From: Leo Barhorst via Seesat-l <>
Date: Wed, 28 May 2014 12:29:58 +0200
Just my thoughts.
How old were the TLE you used to predict the transit?
A small orbital adjustment of ISS can result in great changes in time and 

Leo Barhorst

-----Oorspronkelijk bericht----- 
From: Kevin Fetter via Seesat-l
Sent: Wednesday, May 28, 2014 11:37 AM
Subject: Re: ISS Solar Transit

Looking up the info on the pass, it happened around 5:50:43 utc.

At the time, the sun was very high in the sky, so when the iss passed across 
the sun, it was travelling at a good speed across the solar disc. So when 
you when to take the exposure, the iss had moved a good distance away from 
the centre of the solar disk. You would need to capture at very short 
exposure times, and get a few images during the transit,  to hope to catch 
the iss at the centre of the solar disc.

They say the camera you have, can capture up to 6 frames per second, so set 
the camera to do that.


On Wed, 5/28/14, Debasis Sarkar via Seesat-l <> wrote:

Subject: ISS Solar Transit
Received: Wednesday, May 28, 2014, 2:34 AM

Hi Friends,

I am new in this list and thanks for allowing me to be

I am sharing a picture of ISS transit that I have taken on
17th May 2014
from a location lat=26.101400 & lon=87.984298.

The optics was Celestron SCT 8" with Nikon D7000 at Prime
I have taken a Video too with Sky Watchers 120mm f/8
reflector fitted with
a HD Video cam.

Interestingly, despite being on centerline (Plus Minus 200
meters), I did
not get ISS to run through the center of solar disc.
Instead, I had it pass
through a distance of at least 1/4 solar radii from the
center of Sun.
Width of visibility path was 6km. I was following Calsky fro
prediction. Could you please enlighten me on what might have
gone wrong?

Thanks and regards-

Debasis Sarkar
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