Re: Shenzhou 6 - revised search elements

From: J. Zhu (jinzhu@bjp.org.cn)
Date: Tue Oct 11 2005 - 07:17:00 EDT

  • Next message: Ted Molczan: "Request for obs of Shenzhou 6 from Australia and New Zealand"

    I wonder how long after the launch the spaceship could be seen with naked eye
    or from a telescope during the daylight?
    
    Thank you very much for the update elements!	
    
    ======= 2005-10-11 19:00:40 You wrote in your letter: =======
    
    >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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    = = = = = = = = = = = = = = = = = = = =
    			
    
    With best regards, Jin
    
    2005-10-11 
    =========================================================				
    Dr. Jin Zhu                         Tel.: +86-10-51583002
    Director, Beijing Planetarium             +86-13601369613
    No. 138 Xizhimenwai Street           fax: +86-10-68353003
    Beijing 100044, CHINA            email: jinzhu@bjp.org.cn
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