Predicting 23632 Interball passes

Bjorn Gimle (bjorn.gimle@online.dextel.se)
04 Sep 1995 13:09:30 GMT

I used this elset to test, once more, different prediction programs:

Interball, set 8, 23632, 95 39 A                                            
1 23632U 95039A   95245.49547350  .00000068  00000-0  00000+0 0    88
2 23632  63.2770 259.6870 9238460 314.5860   9.1800  0.26375601    85

This time, the differences are smaller, but important (elset age?)
The SkyMap 5.10 SGP4 graphic prediction shows maximum magnitude
to occur between 23:50 at 186 deg. az. , 33 deg.elev. 
and 23:54 at 179 deg az., 52 deg.  elev.
Here is a SkyMap text report:
(P, H, 4 are edited in for SGP, Hande, SGP4):

                           TLE file:  C:\TLE\TEMP\23632.tle
                 Configuration file:  H:\QUICKSKY\23632.CFG
                      Tracking site:  Jeffrey C. Hunt, Maryland, US
                           Timezone:   -4 hours
                       Report times:  UTC  
                           Latitude:  +39.3000*
                          Longitude:   -76.6000*
                           Altitude:     +0.0 meters

            Start of Track     Peak Elevation       End of Track
  Date     Time   Azim Elev   Time   Azim Elev   Time   Azim Elev VMag Cat #
Satellite Name
-------- -------- ---- ---- -------- ---- ---- -------- ---- ---- ---- -----
--------------
 9/ 8/95  2:23:36  48* 10*   9:47:50 178* 87*  10:45:21 260* 78*  18.0 23632
Interball, set 8, 23632, 95 39 A
 9/ 9/95  3:36:09  62* 10*  10:14:29 175* 74*  10:46:14 201* 73*  17.0 23632
Interball, set 8, 23632, 95 39 A
 9/ 9/95 23:45:32 193* 10 P  8:02:45 354* 71*  10:47:08 313* 58*  10.6 23632
Interball, set 8, 23632, 95 39 A
 9/ 9/95 23:45:33 193* 10 4  8:02:59 354* 71*  10:47:08 313* 58*  10.6 23632
Interball, set 8, 23632, 95 39 A
 9/ 9/95 23:45:45 193* 10 H  8:02:43 354* 71*  10:47:08 313* 58*  10.6 23632
Interball, set 8, 23632, 95 39 A
 9/11/95  1:05:49  38* 10*   9:11:36 358* 86*  10:48:02 289* 71*  17.7 23632
Interball, set 8, 23632, 95 39 A

Here is a TrakStar prediction for 23632 from Maryland ( UT, Azim, Elev.)
(If you are using a telescope, you may be able to see 
the West Coast pass also:)

1995 Sep 06  05:00:00  MD   279.8189   8.8474  10898.034   1.945648
1995 Sep 06  05:05:00  MD   284.7595  17.6727  11604.011   2.676414
1995 Sep 06  05:10:00  MD   289.3571  24.8240  12487.189   3.182173
1995 Sep 06  05:15:00  MD   293.6627  30.5990  13495.640   3.520001
1995 Sep 06  05:20:00  MD   297.6750  35.2364  14586.043   3.736031
1995 Sep 06  05:25:00  MD   301.3947  38.9653  15727.718   3.867041
1995 Sep 06  05:30:00  MD   304.8257  41.9792  16899.377   3.939707
1995 Sep 06  05:35:00  MD   307.9755  44.4332  18086.482   3.972613
1995 Sep 06  05:40:00  MD   310.8862  46.4837  19292.856   3.978632
1995 Sep 06  05:45:00  MD   313.5065  48.1481  20484.360   3.965980

1995 Sep 09  23:35:00  MD   188.7473   5.3972   6313.638  -2.895303
1995 Sep 09  23:40:00  MD   180.8398  28.0315   5823.754  -0.272652
1995 Sep 09  23:45:00  MD   169.0618  49.0105   6119.226   2.127631
1995 Sep 09  23:50:00  MD   149.8146  63.7827   7009.542   3.659344
1995 Sep 09  23:55:00  MD   121.0801  70.8853   8237.664   4.435182
1995 Sep 10  00:00:00  MD    92.1674  71.6735   9626.104   4.775201
1995 Sep 10  00:05:00  MD    72.8601  69.5203  11079.340   4.892717
1995 Sep 10  00:10:00  MD    61.4420  66.7358  12549.168   4.898882
1995 Sep 10  00:15:00  MD    54.3416  64.0607  14026.768   4.848880
1995 Sep 10  00:20:00  MD    49.7225  61.7562  15469.481   4.771402
1995 Sep 10  00:25:00  MD    46.4958  59.7805  16886.793   4.681176
1995 Sep 10  00:30:00  MD    44.1411  58.0947  18276.173   4.586026
1995 Sep 10  00:35:00  MD    42.3653  56.6552  19636.846   4.490199
1995 Sep 10  00:40:00  MD    40.9928  55.4232  20968.989   4.395994

ViewSat v1.08  12/08/92  also has a different track position :

Viewing location: Baltimore, MD, Lat: 39.291, Lon: -76.613, El: 0
Date and time for start of run: 04 Sep 1995 15:30:00  UTC   
Maximum sun elevation: -7, Minimum sat. elevation: 10.0
Maximum sat. magnitude: 15.0, Minimum Mean Motion: 0.2
Element data file: 23632.TLE

  Date       Time     Azim   Elev   RA     Dec     Alt     Range   Phs   Mag
              UTC     deg    deg   hr:mn   deg     km       km     deg
#23632 Interball, set 8, 23632, 95 39 A
06 Sep 1995 05:02:00 281.75  12.58 17:05  16.96  7623.12 11152.10  89.8 10.7
            05:04:00 283.70  16.01 17:13  20.54  8177.23 11441.09  91.4 10.8
            05:06:00 285.60  19.19 17:22  23.87  8733.42 11761.37  92.9 10.8
            05:08:00 287.45  22.11 17:30  26.96  9290.56 12108.79  94.2 10.8
            05:10:00 289.26  24.80 17:38  29.83  9847.69 12479.55  95.5 10.9
            05:12:00 291.02  27.27 17:46  32.47 10404.08 12870.24  96.6 10.9
            05:14:00 292.73  29.53 17:54  34.91 10959.12 13277.82  97.6 11.0
            05:16:00 294.40  31.60 18:01  37.17 11512.27 13699.60  98.5 11.0
            05:18:00 296.02  33.50 18:09  39.24 12063.21 14133.29  99.4 11.1
            05:20:00 297.59  35.24 18:16  41.16 12611.61 14576.84 100.1 11.1
            05:22:00 299.12  36.83 18:23  42.92 13157.21 15028.52 100.8 11.2
            05:24:00 300.60  38.29 18:31  44.55 13699.82 15486.82 101.5 11.3
            05:26:00 302.03  39.63 18:38  46.06 14239.30 15950.43 102.0 11.3
            05:28:00 303.41  40.86 18:44  47.44 14775.53 16418.26 102.6 11.4
            05:30:00 304.76  41.99 18:51  48.73 15308.43 16889.34 103.0 11.4
            05:32:00 306.05  43.03 18:58  49.91 15837.92 17362.86 103.5 11.5

09 Sep 1995 23:58:00 102.98  71.86 19:30  33.20  8879.85  9068.16 115.2  9.9
            23:59:00  97.46  71.82 19:35  34.77  9158.57  9349.74 115.3 10.0
            00:00:00  92.35  71.63 19:39  36.23  9437.33  9634.34 115.4 10.0
            00:01:00  87.67  71.34 19:43  37.59  9716.04  9921.40 115.5 10.1
            00:02:00  83.42  70.96 19:48  38.87  9994.59 10210.45 115.6 10.2
            00:03:00  79.59  70.52 19:52  40.06 10272.90 10501.06 115.7 10.2
            00:04:00  76.13  70.03 19:56  41.19 10550.90 10792.88 115.7 10.3
            00:05:00  73.03  69.50 20:00  42.24 10828.52 11085.58 115.7 10.3
            00:06:00  70.24  68.96 20:04  43.23 11105.71 11378.90 115.7 10.4
            00:07:00  67.74  68.40 20:08  44.17 11382.40 11672.58 115.7 10.4
            00:08:00  65.47  67.84 20:12  45.04 11658.50 11966.37 115.7 10.5
            00:09:00  63.43  67.28 20:15  45.87 11934.06 12260.17 115.7 10.6

============================================================
== bjorn.gimle@online.dextel.se ;  59.22371 N, 18.22857 E ==
==(bjorn.gimle@duesenberg.se)      +46-8-7428086          ==
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