Date: Sun, 28 Nov 93 04:30:29 PST
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Subject: Ham-Space Digest V93 #93
To: Ham-Space
Ham-Space Digest Sun, 28 Nov 93 Volume 93 : Issue 93
Today's Topics:
APT-Satellites: Report NOV 21, 1993
Two-Line Orbital Element Set Format
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----------------------------------------------------------------------
Date: Mon, 22 Nov 1993 08:16:23 GMT
From: dog.ee.lbl.gov!agate!howland.reston.ans.net!xlink.net!gmd.de!peter.henne%gmd.de@network.ucsd.edu
Subject: APT-Satellites: Report NOV 21, 1993
To: ham-space@ucsd.edu
Observed at station 50.7 NLat, 7.1 ELon, NOV 21, 1993
NOAA-9: APT 137.62 On
NOAA-10: APT 137.50 On
NOAA-11: APT 137.62 On
NOAA-12: APT 137.50 On
Meteor 2-21: APT 137.85 On
Meteor 3-3: APT 137.30 On
NOAA-9, 11 and 12 transmit ch.2 and ch.4 from daylight parts
of the orbit, ch.3 and ch.4 from night passes. NOAA-10 always
transmits ch.2 and ch.4, so ch.2 (vis) is black at night.
No changes for Meteor 2-21 (weak signal) and Meteor 3-3, both
transmit only vis from daylight.
+------------------------------------------+
|Peter Henne (peter.henne@gmd.de) |
| (henne@gmd.de) |
|German Nat.Research Center.f.Comp.Science |
|D-5205 St.AUGUSTIN 1 |
|Fed.Rep. of Germany |
+------------------------------------------+
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Date: Fri, 26 Nov 1993 16:05:27 MST
From: swrinde!cs.utexas.edu!howland.reston.ans.net!agate!library.ucla.edu!news.mic.ucla.edu!unixg.ubc.ca!nntp.cs.ubc.ca!alberta!ugc!nebulus!ve6mgs!usenet@network.ucsd.edu
Subject: Two-Line Orbital Element Set Format
To: ham-space@ucsd.edu
As a service to the satellite user community, the following description of the
NORAD two-line orbital element set format is uploaded to sci.space.news and
rec.radio.info on a monthly basis. The most current orbital elements
from the NORAD two-line element sets are carried on the Celestial BBS, (513)
427-0674, and are updated daily (when possible). Documentation and tracking
software are also available on this system. The Celestial BBS may be accessed
24 hours/day at 300, 1200, 2400, 4800, or 9600 bps using 8 data bits, 1 stop
bit, no parity. In addition, element sets (also updated daily) and some
documentation and software are also available via anonymous ftp from
archive.afit.af.mil (129.92.1.66) in the directory pub/space.
==============================================================================
Data for each satellite consists of three lines in the following format:
AAAAAAAAAAA
1 NNNNNU NNNNNAAA NNNNN.NNNNNNNN +.NNNNNNNN +NNNNN-N +NNNNN-N N NNNNN
2 NNNNN NNN.NNNN NNN.NNNN NNNNNNN NNN.NNNN NNN.NNNN NN.NNNNNNNNNNNNNN
Line 0 is a eleven-character name.
Lines 1 and 2 are the standard Two-Line Orbital Element Set Format identical
to that used by NORAD and NASA. The format description is:
Line 1
Column Description
01-01 Line Number of Element Data
03-07 Satellite Number
10-11 International Designator (Last two digits of launch year)
12-14 International Designator (Launch number of the year)
15-17 International Designator (Piece of launch)
19-20 Epoch Year (Last two digits of year)
21-32 Epoch (Julian Day and fractional portion of the day)
34-43 First Time Derivative of the Mean Motion
or Ballistic Coefficient (Depending on ephemeris type)
45-52 Second Time Derivative of Mean Motion (decimal point assumed;
blank if N/A)
54-61 BSTAR drag term if GP4 general perturbation theory was used.
Otherwise, radiation pressure coefficient. (Decimal point assumed)
63-63 Ephemeris type
65-68 Element number
69-69 Check Sum (Modulo 10)
(Letters, blanks, periods, plus signs = 0; minus signs = 1)
Line 2
Column Description
01-01 Line Number of Element Data
03-07 Satellite Number
09-16 Inclination [Degrees]
18-25 Right Ascension of the Ascending Node [Degrees]
27-33 Eccentricity (decimal point assumed)
35-42 Argument of Perigee [Degrees]
44-51 Mean Anomaly [Degrees]
53-63 Mean Motion [Revs per day]
64-68 Revolution number at epoch [Revs]
69-69 Check Sum (Modulo 10)
All other columns are blank or fixed.
Example:
NOAA 6
1 11416U 86 50.28438588 0.00000140 67960-4 0 5293
2 11416 98.5105 69.3305 0012788 63.2828 296.9658 14.24899292346978
--
Dr TS Kelso Assistant Professor of Space Operations
tkelso@afit.af.mil Air Force Institute of Technology
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End of Ham-Space Digest V93 #93
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