Shenzhou 6 - revised search elements

From: Ted Molczan (seesat@rogers.com)
Date: Tue Oct 11 2005 - 07:00:40 EDT

  • Next message: J. Zhu: "Re: Shenzhou 6 - revised search elements"

    It appears that the launch window will start on Wednesday Oct 12 UTC, one day
    sooner than originally reported, perhaps in an effort to outrun forecast bad
    weather later in the week.
    
    The most frequently rumoured launch time now is 01:00 UTC, but I have not given
    up on 03:00 UTC, so I have generated search elements for both times. Section 1
    has the 01:00 UTC launch elements; Section 2 has the 03:00 UTC elements.
    
    Either launch time will result in visibility over much of the world between
    about 50 N and 50 S latitude. Roughly speaking, the northern hemisphere will
    have morning visibility; the southern hemisphere will have evening visibility.
    Use the search elements to determine your observing prospects.
    
    Note that the zero decay terms of the circularized Shenzhou elements are
    intentional; past missions made a number of small manoeuvres throughout their
    flight, that essentially negated the effects of drag, apparently to achieve a
    nearly exactly repeating ground track every 31 revolutions.
    
    1. Launch on 2005 Oct 12 at 01:00 UTC
    
    1.1 Elliptical Parking Orbit until 2005 Oct 12 at 07:53 UTC
    
    The spacecraft and rocket body will be in nearly same orbit for the first approx
    6 h and 53 m after launch. Below are search elsets for both.
     
    Shenzhou 6 r    15.5  3.4  0.0  4.4 d
    1 70601U 70600B   05285.08931662  .00809611  00000-0  60000-3 0    09
    2 70601  42.4153  27.4814 0102545 130.0626 230.9292 16.03716253    07
    
    Shenzhou 6       7.8  2.5  0.0  5.4 d
    1 70600U 70600A   05285.08933035  .00794136  00000-0  60000-3 0    09
    2 70600  42.4153  27.4814 0106040 130.0626 230.9292 16.02866600    01
    
    The rocket's apogee will be nearly 5 km lower than Shenzhou's, as a result of
    its separation manoeuvre upon orbital insertion. Therefore, Shenzhou will trail
    a short distance behind its rocket.
     
    1.2 Circularized Orbit after 2005 Oct 12 at 07:53 UTC
    
    Shenzhous 1, 3, 4 and 5 manoeuvred to raise their perigee as they passed through
    apogee for the 5th time. Shenzhou 1 raised its perigee by only 8 km; Shenzhous
    3, 4 and 5 raised it more than 130 km, to nearly circularize their orbit, and
    Shenzhou 6 is expected to do the same. Approx 6 h and 53 m after launch,
    Shenzhou 6 should be in this orbit:
    
    Shenzhou 6       7.8  2.5  0.0  5.4 d
    1 70600U 70600A   05285.33849619  .00000000  00000-0  00000-0 0    02
    2 70600  42.4207  25.8822 0002833 248.3475 111.7085 15.78579562    08
    
    
    2. Launch on 2005 Oct 12 at 03:00 UTC
    
    2.1 Elliptical Parking Orbit until 2005 Oct 12 at 09:53 UTC
    
    The spacecraft and rocket body will be in nearly same orbit for the first approx
    6 h and 53 m after launch. Below are search elsets for both.
     
    Shenzhou 6 r    15.5  3.4  0.0  4.4 d
    1 70601U 70600B   05285.17264995  .00809611  00000-0  60000-3 0    07
    2 70601  42.4153  57.5635 0102545 130.0626 230.9292 16.03716253    02
    
    Shenzhou 6       7.8  2.5  0.0  5.4 d
    1 70600U 70600A   05285.17266368  .00794136  00000-0  60000-3 0    07
    2 70600  42.4153  57.5635 0106040 130.0626 230.9292 16.02866600    06
    
    The rocket's apogee will be nearly 5 km lower than Shenzhou's, as a result of
    its separation manoeuvre upon orbital insertion. Therefore, Shenzhou will trail
    a short distance behind its rocket.
     
    2.2 Circularized Orbit after 2005 Oct 12 at 09:53 UTC
    
    Shenzhous 1, 3, 4 and 5 manoeuvred to raise their perigee as they passed through
    apogee for the 5th time. Shenzhou 1 raised its perigee by only 8 km; Shenzhous
    3, 4 and 5 raised it more than 130 km, to nearly circularize their orbit, and
    Shenzhou 6 is expected to do the same. Approx 6 h and 53 m after launch,
    Shenzhou 6 should be in this orbit:
    
    Shenzhou 6       7.8  2.5  0.0  5.4 d
    1 70600U 70600A   05285.42182953  .00000000  00000-0  00000-0 0    03
    2 70600  42.4207  55.9643 0002833 248.3475 111.7085 15.78579562    03
    
    
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