Re: Apollo TLE to Keplarian elements

From: Mike McCants (mmccants@io.com)
Date: Tue May 25 2004 - 14:10:33 EDT

  • Next message: Mike McCants: "Re: Apollo TLE to Keplarian elements"

    >I wanted to plot the position of the Apollo 16 Saturn IVB booster in
    >trans-lunar trajectory (on the way to the Moon) in 1972.
    
    There is a tle on Jonathan's site.  It says:
    
    1 06301U 72096  B 72342.71041666  .00000000 +00000-0 +00000-0   00011
    2 06301 028.4240 344.4490 9704960 154.9150 154.7300 00.08500276 00011
    
    For the origin of this tle, it says: "jcm by hand:  MA is TA"
    
    I ran "SeeSat 4.0" against this tle and it is clear that the mean
    anomaly should not be 154 at this epoch.  I changed the elset to:
    
    1 06301U 72096  B 72342.71041666  .00000000 +00000-0 +00000-0   00011
    2 06301 028.4240 344.4490 9704960 154.9150   0.0000 00.08500276 00011
    
    This produced the following results for Austin, TX:
    
    1972 DEC 7/8 UT
     time   alt azi    R.A.   dec      range       hgt sun
    1900:00  23 168  18 27.5 -35.5     21785     19662 151
    2000:00  28 175  18 53.8 -31.7     29792     27885 147
    2100:00  30 186  19  8.3 -29.3     36977     35165 144
    2200:00  29 199  19 18.0 -27.5     43665     41788 141
    2300:00  26 212  19 25.2 -26.1     50029     47917 140
    0000:00  19 224  19 31.2 -25.0     56166     53653 138
    
    1972 DEC 8/9 UT
     time   alt azi    R.A.   dec      range       hgt sun
    1846:00  22 130  20 37.7 -18.8    130447    128048 129
    1946:00  31 142  20 37.6 -18.7    132877    131030 128
    2046:00  38 158  20 37.3 -18.6    135424    133948 128
    2146:00  41 176  20 36.9 -18.5    138118    136804 128
    2246:00  40 195  20 36.5 -18.4    140973    139601 128
    2346:00  35 212  20 36.1 -18.2    143987    142341 128
    0046:00  27 226  20 36.0 -18.0    147143    145027 127
    0146:00  17 237  20 36.1 -17.8    150411    147660 127
    
    1972 DEC 9/10 UT
     time   alt azi    R.A.   dec      range       hgt sun
    1855:00  23 127  20 56.7 -16.3    188332    185964 125
    1955:00  33 139  20 56.4 -16.3    189648    187858 125
    2055:00  40 155  20 56.0 -16.3    191116    189721 125
    2155:00  43 174  20 55.4 -16.2    192763    191551 125
    2255:00  43 194  20 54.9 -16.1    194605    193351 124
    2355:00  37 212  20 54.4 -16.0    196637    195120 124
    0055:00  29 226  20 54.1 -15.9    198842    196859 124
    0155:00  19 238  20 54.0 -15.8    201189    198568 124
    
    1972 DEC 10/11 UT
     time   alt azi    R.A.   dec      range       hgt sun
    1859:00  23 125  21  7.9 -14.9    225946    223599 123
    1959:00  33 138  21  7.6 -14.9    226598    224843 123
    2059:00  41 153  21  7.2 -14.9    227411    226064 123
    2159:00  45 173  21  6.7 -14.8    228414    227262 123
    2259:00  44 193  21  6.1 -14.8    229620    228438 123
    2359:00  39 212  21  5.7 -14.7    231029    229592 123
    0059:00  31 227  21  5.3 -14.6    232622    230723 123
    0159:00  21 238  21  5.1 -14.5    234367    231833 123
    
    The "ephem" program says that the moon was at RA 21 16, Dec -13.1
    at 0200 UT on Dec 11, 1972.  Dist 244000 miles.  The elongation
    was only 60 degrees.
    
    The first night out, Dec 8 at 0000 UT, the objects were very low in the
    southwest after sunset.
    
    Mike McCants
    
    -------------------------------------------------------------------------
    Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive:  
    http://www.satobs.org/seesat/seesatindex.html
    



    This archive was generated by hypermail 2b29 : Tue May 25 2004 - 14:15:32 EDT