RE: USA 193 visibility windows

Date: Tue Feb 12 2008 - 13:47:34 UTC

  • Next message: Ted Molczan: "RE: USA 193 visibility windows"

    I presume window for usa 193 for 35 s will be roughly good for 26.0355 e
    30.710 s ?
    How frequently do you update
    For usa193 I am forecasting with orbitron from there.
    -----Original Message-----
    From: Ted Molczan [] 
    Sent: Tuesday, February 12, 2008 5:01 AM
    Subject: USA 193 visibility windows
    Below are estimated visibility windows of USA 193 (aka 06057A / 29651) for
    latitudes of the positional observers known to me.
    A visibility window is a period of time during which a satellite is visible
    an observer's morning or evening twilight sky.
          Period      Lat    Time  Dir
    Feb 05 - Feb 11  44 N  Morning  SB
    Feb 07 - Feb 13  30 N  Morning  SB
    Feb 13 - Feb 18  30 N  Evening  NB
    Feb 16 - Feb 22  44 N  Evening  NB
    Feb 17 - Feb 29  51 N  Evening  NB
    Feb 18 - Mar 02  56 N  Evening  NB
    Feb 20 - Feb 27  35 S  Morning  SB
    Mar 03 - Mar 07  56 N  Evening  SB
    Mar 01 - Mar 08  51 N  Evening  SB
    Mar 04 - Mar 10  44 N  Evening  SB
    Mar 08 - Mar 11  30 N  Evening  SB
    Mar 14 - Mar 17  35 S  Morning  NB 
    SB and NB denote southbound and northbound passes, respectively.
    Not all observers near a given latitude will have good passes on each day of
    window. A few will have passes culminating high above the horizon, most will
    have much lower elevation passes.
    I am near latitude 44 N, so my morning south-bound window ended today. The
    window closes about Feb 13 for observers near 30 N, for whom an evening
    northbound window opens about the same day. That window will move
    northward, opening for observers at 44 N on Feb 16.
    Collectively, observers at or north of 44 N will have evening visibility
    about March 10.
    During the final few days before decay, currently estimated to occur within
    about one week of March 18, observers near 35 S will have morning
    Since there are few positional observers in the southern hemisphere, we are
    likely to lose the object after about March 10, unless they are interested
    observe it, and fortunate to have reasonably high-elevation passes and good
    Ted Molczan
    Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive:
    No virus found in this incoming message.
    Checked by AVG Free Edition. 
    Version: 7.5.516 / Virus Database: 269.20.0/1268 - Release Date: 2/9/2008
    11:54 AM
    Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive:

    This archive was generated by hypermail 2b29 : Tue Feb 12 2008 - 14:18:35 UTC