Re: Sunangle and skymap

From: Ulhas Deshpande (ulhas@nagpur.dot.net.in)
Date: Sun Mar 10 2002 - 03:08:00 EST

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    Right Bjoern
    As I see it I need to concentrate on the area around the anti sun point. So
    look east in the evening and west in the morning. But whatis the 'Clerke
    Belt" and how do I find the dec for 21 N?
    Ulhas Deshpande
    Nagpur, Central India
    21 08 30 N,79 03 08 E Alt 247 m
    ----- Original Message -----
    From: "Björn Gimle" <b_gimle@algonet.se>
    To: "Ulhas Deshpande" <ulhas@nagpur.dot.net.in>; "Matson, Robert"
    <ROBERT.D.MATSON@saic.com>; "Seesat-L" <SeeSat-L@satobs.org>
    Sent: Wednesday, 06 March, 2002 11:54
    Subject: Re: Sunangle and skymap
    
    
    >
    > > GMT). I set up my 16 x 70 binos and looked for any flashes in the region
    > but
    > > found none in about half hours search. Are none of these sats flashing
    for
    > > India? How does one know when flashes occur? Is there any preffered sun
    > > angle?
    >
    >
    > The geometry that causes this phenomenon is based on the following
    > assumptions:
    > 1. The satellite is geostationary, i.e. in circular orbit with MM=1.0027
    and
    > i=0
    > 2. It is operationally stabilized to point its solar panel normals near
    the
    > Sun.
    > 3. The panel normals are fixed at declination 0, but follow the Sun in
    R.A.
    > This means that if the Sun's declination is "near" the declination of the
    > Clarke belt (-8 from 60N) the satellites often flare near the R.A. of 12h
    +
    > Sun's R.A.
    >
    > You don't really have to know which satellites to look at - just find the
    > most likely place, and keep watching it as the rotating Earth shifts it
    > (about 2.5 degrees/h in R.A., 18 degrees/h or more in R.A.
    >
    >
    > Use SkyMap (Rob Matson) to find where to look.
    > See instructions and an example with screenshot and .cfg file at
    > http://www.algonet.se/~b_gimle/geoflare.htm
    >
    > -- bjorn.gimle@tietotech.se (office)                         --
    > -- b_gimle@algonet.se (home)  http://www.algonet.se/~b_gimle --
    > -- COSPAR 5919, MALMA,    59.2576 N, 18.6172 E, 23 m         --
    > -- COSPAR 5918, HAMMARBY, 59.2985 N, 18.1045 E, 44 m         --
    >
    >
    >
    >
    >
    
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