Re: NEAR Earth Swing-By prediction program for DOS

Bjoern Gimle (b_gimle@algonet.se)
Fri, 16 Jan 1998 22:48:35 +0100

The NEAR page update announced by Craig Cholar contains a link to an
Excel spreadsheet with EFG lat/lon/height values, that translate easily
to SkyMap rocket trajectory ( after I have fixed some bad time cells)

With this, SkyMap users can produce accurate graphic predictions for
the NEAR spacecraft on Jan.23 from 00:00 to 15:00

A section of the .trj file for MapTime= 01/23/98 06:00 UT until 08:00
with 1 km or larger rounding, is given last in the mail, ( I hope these
1.5 kB are not considered out-of-line ), the full length and precision
file (MapTime=00:00 UT until 15:00), and amended Excel sheet is
available at
http://www.algonet.se/~b_gimle/programs/ibmpc    get : esbgtra3.zip

You'll need SkyMap 5.11 or earlier, or 6.1,
since a bug in 6.0 aborts after the first point.

Mike has written a program for generating vectors, and conversion to
text predictions by a modified SeeSat program. I added some SkyMap
readout below at the right (for Mike, 0.1 deg above eps Per at 6:28:50) :

>The input takes the form: lat 30.315 lon -97.866 height .16
...
>The output looks like this:                      SkyMap with new vectors:
> time   alt azi    R.A.    dec  range   hgt sun      RA...     Decl.
>0630:00  39 300   3 55.5  40.59 15758 14526  38      3.922     +40.43
>0635:00  36 302   3 43.0  42.06 14368 13019  38      3.715     +41.92
>0640:00  32 305   3 27.1  43.72 12989 11504  38      3.449     +43.58
...
>I have run my program with the Washington, DC, lat, long:
>lat 38.8975 lon -77.0092 height .16
> time   alt azi    R.A.    dec  range   hgt sun
>0630:00  26 297   3 55.2  36.52 16412 14528  38      3.918     +36.36
>http://www.fc.net/~mikem/direct.html  and get jan23.zip
>ftp://ftp.fc.net/pub/users/mikem/     and get jan23.zip
>
---------- esbgtra5.trj ------------------
0	35.15	-137.32	37627
300	35.91	-138.96	35278
600	36.77	-140.66	32917
900	37.73	-142.42	30545
1200	38.82	-144.26	28160
1500	40.08	-146.22	25763
1800	41.53	-148.33	23351
2100	43.22	-150.63	20926
2400	45.24	-153.22	18487
2700	47.68	-156.24	16036
3000	50.67	-159.94	13575
3300	54.41	-164.81	11114
3600	59.17	-172.00	8667
3660	60.27	-173.93	8182
3720	61.42	-176.09	7699
3780	62.61	-178.55	7219
3840	63.86	178.62	6743
3900	65.13	175.34	6270
3960	66.43	171.50	5802
4020	67.74	166.94	5340
4080	69.00	161.49	4885
4140	70.17	154.95	4439
4200	71.16	147.12	4002
4260	71.85	137.89	3576
4320	72.10	127.36	3165
4380	71.76	115.97	2770
4440	70.70	104.46	2394
4500	68.85	93.60	2041
4560	66.24	83.93	1714
4620	62.90	75.63	1418
4680	58.91	68.65	1157
4740	54.36	62.78	936
4800	49.32	57.84	760
4860	43.90	53.63	632
4920	38.20	50.00	556
4980	32.32	46.82	534
5040	26.39	44.01	566
5100	20.51	41.48	652
5160	14.79	39.19	790
5220	9.31	37.08	976
5280	4.12	35.13	1206
5340	-0.74	33.31	1475
5400	-5.26	31.60	1778
5460	-9.44	29.98	2112
5520	-13.27	28.43	2472
5580	-16.80	26.96	2853
5640	-20.03	25.54	3254
5700	-22.98	24.17	3670
5760	-25.69	22.85	4099
5820	-28.18	21.58	4540
5880	-30.46	20.34	4990
5940	-32.56	19.13	5448
6000	-34.50	17.96	5912
6060	-36.28	16.81	6382
6120	-37.94	15.69	6857
6180	-39.47	14.60	7335
6240	-40.89	13.53	7817
6300	-42.21	12.48	8301
6600	-47.62	7.52	10747
6900	-51.58	2.95	13211
7200	-54.58	-1.30	15674

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-- SeeSat-L / Visual Satellite Observer Home Page found at   --
-- http://www.satellite.eu.org/satintro.html       --
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