Re: Why is ISS still visible in Earth's shadow?

From: DIVYADARSHAN PUROHIT (divyadarshan63@gmail.com)
Date: Tue May 03 2011 - 05:21:05 UTC

  • Next message: Russell Eberst: "2011MAY2-3.OBS"

    Dear Friends,
    
    As you might be aware of earth shine.I think earth shine ,penumbrall effect
    make this miracle.Our discussion is very interesting & helps to open various
    new doors.
    with regards,
    DDPurohit
    
    On Tue, May 3, 2011 at 12:34 AM, Fred Valcho <fvalcho@yahoo.com> wrote:
    
    > I love this topic. Perhaps Ralf, or anyone with the correct tracking gear,
    > could
    > capture the ISS in the Earth's shadow? and post it. I for one, would be
    > very
    > interested.
    >
    >
    >
    > ----- Original Message ----
    > From: Patrick Schmeer <pasc1312-seesat@yahoo.de>
    > To: seesat-l@satobs.org
    >  Sent: Mon, May 2, 2011 11:25:26 AM
    > Subject: Re: Why is ISS still visible in Earth's shadow?
    >
    > I have followed with my 8" SCT the ISS many
    > times not only for some seconds but up to two
    > or three minutes after entering the Earth's
    > shadow - the apparent magnitude was about 11.
    > For me the only explanation would be
    > artificial light sources (position lights or
    > interior lighting of the ISS).
    >
    > Patrick
    >
    >
    > --- Woodchuk <woodl@telus.net> wrote:
    >
    > > Friday evening using a  12.5" dob I followed
    > > the ISS for several second (about 15) after
    > > it went dark as it passed into Earth's shadow .
    > > It was still faintly visible when I lost it in
    > > the trees. It would take almost a minute for
    > > the ISS to move far enough down range before the
    > > Sun would be 6 below the horizon as seen from ISS
    > > and still within the region of Civil twilight --
    > > as seen on  Earth (as tested using Guide 8). I
    > > think that would still be enough light to
    > > illuminate ISS so it could still be seen in a
    > > telescope at about 100x. Being above the Earth's
    > > atmosphere will change the amount of twilight
    > > but by how much??
    > >
    > > I'm sure the extent of twilight could be checked
    > > on video taken from the ISS.
    > >
    > > Larry Wood
    > >
    > >
    > > On 01/05/2011 6:36 PM, Bob King wrote:
    > > > Hi everyone,
    > > > I've always wanted to ask this question. No
    > > > doubt some of you have followed the space station
    > > > into Earth's shadow, where it's visible for some
    > > > time with binoculars. Is it being illuminated by
    > > > the moon or ???
    > > > Thank you for your help!
    > > > Best wishes,
    > > > Bob
    >
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    -- 
    Divyadarshan D.Purohit
    Gurudev Observatory,
    Vadodara
    India
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