Re: GEO Sats.

From: Tony Beresford (
Date: Fri Mar 02 2001 - 20:22:59 PST

  • Next message: Russell: "MAR3.OBS"

    At 14:57 3/03/01 , Cantv wrote:
    >I read the web pages sent by Ron Lee, Tony Beresford and Ed Cannon answering
    >my previous mail finding a lot of information about Geo sats. With that
    >readings and using some formulas, I got the altitude of Geo sats : 35.869
    >Km. aprox. So, I think that is very far to use  binoculars.
    The solar panels have areas of 30 square meters or even more. Though they
    have only 12 percent reflectivety, they can give mag +1 or +2 sharp flashes.
    Just take a Iridium flare at mag -7, and dim it 2500 times (about 8.5 m)
    gives you mag 1.5 at 40,000Km range 
    > What I am gonna
    >do is to use a reflex camera pointing to the sky (according to latest
    >Geo-sats tle's) leaving open the shooter for a couple of hours. 
    This is a the technique of an image of geosats that Paul Maley made
    years ago. A print is on show at the space & rockets section of the
    Science Museum in London. Remember the limiting factor on the exposure
    length will be the sky brightness particularly if you are in a urban environment.
    This means use as large an F-ratio camera lense as feasible.
    Working geosats wil show up as point images, non-working ones as short streaks,
    aand the stars as lots of overlapping long streaks.
    >According to
    >previous mails, due to my low latitud the best days will be from 03/19 to
    >03/22 during equinox. My first target will be Geo-sats non-operational
    >because there are tumbling although they are higher.I am looking for an
    >evidence of "parking" problem along geostationary arc above the equator. !
    >Richard Bassan
    >Caracas, venezuela.
    >Unsubscribe from SeeSat-L by sending a message with 'unsubscribe'
    >in the SUBJECT to
    Unsubscribe from SeeSat-L by sending a message with 'unsubscribe'
    in the SUBJECT to

    This archive was generated by hypermail 2b29 : Fri Mar 02 2001 - 20:40:17 PST