BepiColombo flyby

From: Alexandre Amorim via Seesat-l <>
Date: Tue, 7 Apr 2020 18:06:43 +0000 (UTC)
Dear friends
In April 9-10 we have BepiColombo spacecraft flyby.
More information:ópolis&alt=30&tz=EBST

(Costumize ephemeris for your site).

 Conheça de antemão os eventos celestes do ano
 "Anuário Astronômico Catarinense 2020" 

    Em terça-feira, 7 de abril de 2020 17:03:34 UTC, <> escreveu:  
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Today's Topics:

  1. Re: I saw ISS! (Patrick Schmeer)
  2. 2020APR6.OBS (Russell Eberst)


Message: 1
Date: Mon, 6 Apr 2020 17:26:26 +0000 (UTC)
From: Patrick Schmeer <>
To: Seesat-l <>
Subject: Re: I saw ISS!
Message-ID: <>
Content-Type: text/plain; charset=UTF-8

My own "earthshine hypothesis" is of course nonsense.
When the ISS enters Earth's shadow, our planet would
be still illuminated for an observer at a much higher
altitude ? but not for the ISS itself.
Cees wrote:
> To re-iterate; it was new Moon on March 24th, so
> with the Sun below the horizon, so was the Moon.
Anyway, the new moon would be too faint to cause a
noticeable effect.

> Hence your reasoning also suggests that city lights
> are the remaining option.
This option can also be tested. How bright you see the
ISS in Earth's shadow would depend on the cloud cover
above the bright cities (of course your view of the ISS
should not be blocked by clouds).
The moonlight option (around full moon in particular)
is still valid (for many of my own sightings, not for
Cees'/Cees's observation).

    Am Montag, 6. April 2020, 15:24:23 MESZ hat C. Bassa <> Folgendes geschrieben:  
 Hi Patrick,

On Mon, Apr 6, 2020 at 3:08 PM Patrick Schmeer <> wrote:
> I still think Cees' city lights hypothesis is wrong.

I politely disagree.

In my earlier post, I already ruled out your first two hypotheses; 1)
Earthshine and 2) moonlight for the 22:53UTC observation on March
23rd. Here is the observation I posted earlier:

To re-iterate; it was new Moon on March 24th, so with the Sun below
the horizon, so was the Moon.

The plot at shows the location of ISS
above the Earth. The red line indicates the terminator, and the 3 blue
lines on the dark side indicate the loci of civil (-6 deg solar
altitude), nautical (-12 deg) and astronomical (-18 deg). Hence,
almost the entire footprint of the ISS (gray circle) is located deep
at night; only a small bit of it near Iceland overlaps with locations
between nautical and astronomical twilight. This essentially rules out

You yourself mention that artificial lights on board ISS can be ruled out.

Hence your reasoning also suggests that city lights are the remaining
option. It is interesting to note that at 22:53UTC, ISS was at 60
degrees altitude from Paris, also known as the "city of light".
Furthermore, my observations showed that ISS was fainter around
22:56UTC when it was above the Alps, where there are significantly
less cities.

? ? Cees


Message: 2
Date: Tue, 7 Apr 2020 07:30:00 +0000
From: Russell Eberst <>
To: Ted Molczan <>, Peter Wakelin
    <>, Bjoern Gimle <>,
    Mike McCants <>, Seesat List
Subject: 2020APR6.OBS
Message-ID: <>
Content-Type: text/plain; charset=utf-8; format=flowed


2420 2004 0.211 1204
1307214 200102.89 112056+435130 1.4 1.4 0 S
8803901 200558.81 153605+502721 5.9 5.9 0 S
1204813 201138.39 162737+415338 3.1 3.1 0 S
8509702 201624.60 153320+391030 3.0 3.0 0 S
8807801 202033.40 151223+292058 6.3 6.3 0 S
1500402 202251.31 092120+261110 0.5 0.5 0 S
1402906 202745.41 144751+485746 3.9 3.9 0 S
1300801 203351.80 170915+522953 5.8 5.8 0 S
9001001 204515.91 140646+493646 5.7 5.7 0 S

Total Observations (2020)?? 735
best wishes,
Russell Eberst
55.9486N, 3.1383 W, 150 feet = 46metres above MSL.


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