Orbcomm Constellation Status Report (98-01)

Larry Van Horn (steditor@grove.net)
Thu, 15 Jan 1998 09:34:43 -0500

There has been a bunch of confusion since the December 23 launch of the
eight Orbcomm comsats. We have had various names, designators and
frequencies posted to muddy the waters even more. I finally got an accurate
picture of there current constellation status last night from Orbcomm and as
a result can publish this first Orbcomm constellation status report. I have
also verified most of this information via radio monitoring of the downlinks
(a tough job since these birds are still relatively close together).

Orbcomm Constellation Status Report
January 15, 1998  (98-01)

Intl
Desig       Cat No.     Nomenclature

1995-17A  23545       Orbcomm FM 1 (OSC 1) 137.7075 MHz
1995-17B  23546       Orbcomm FM 2 (OSC 2) 137.6075 MHz
1997-84A	25112	Orbcomm FM 8 (A4)	137.460 MHz
1997-84B	25113	Orbcomm FM 10 (A6) 137.7375 MHz
1997-84C	25114	Orbcomm FM 11 (A7) 137.800 MHz
1997-84D	25115	Orbcomm FM 12 (A8) 137.2875 MHz
1997-84E	25116	Orbcomm FM 9 (A5) 137.3125 MHz (was on 137.6875 for three days) 
1997-84F	25117	Orbcomm FM 5 (A1) 137.200 MHz 
1997-84G	25118	Orbcomm FM 6 (A2)	137.225 MHz
1997-84H	25119	Orbcomm FM 7 (A3) 137.435 MHz 

All of the satellite downlinks above are continuous and high power using
SDPSK modulation at 4800 bps. Orbcomm Common Downlink Frequencies: 137.560
MHz (Gateway downlinks-low power OQPSK at 57.6 kbps TDMA) and 400.100 MHz
satellite tracking beacons.

Additional notes from the December 23 launch:
1997-84J	25120	Pegasus Debris
1997-84K	25121	HAPS Hydrazine 4th Stage

Keplerian Elements (courtesy of Celestial BBS on the Internet-Dr. TS Kelso)
OSC 1 (Orbcomm FM 1)
1 23545U 95017A   98011.82257708  .00000436  00000-0  13993-3 0  2780
2 23545  69.9708 278.6563 0009874 107.4096 252.8116 14.45690605146558
OSC 2 (Orbcomm FM 2)
1 23546U 95017B   98011.78544698  .00000372  00000-0  12188-3 0  3182
2 23546  69.9788 279.1598 0008847  96.5449 263.6684 14.45671277146554
Orbcomm FM 08           
1 25112U 97084A   98  6.40542186  .00000585  00000-0  26093-3 0   130
2 25112  45.0182 115.6160 0007115 295.8376  64.2194 14.22180383  1938
Orbcomm FM 10           
1 25113U 97084B   98013.22164608 -.00000270  00000-0 -59942-4 0   142
2 25113  45.0239  84.1461 0006606 325.8996  34.1421 14.21952629  2908
Orbcomm FM 11           
1 25114U 97084C   98011.67693064  .00000406  00000-0  24417-3 0   162
2 25114  45.0214  91.2880 0006649 329.2838  30.7614 14.21888271  2688
Orbcomm FM 12           
1 25115U 97084D   98014.20785371 -.00000270  00000-0 -59942-4 0   172
2 25115  45.0232  79.6220 0005941 340.8471  19.2160 14.21783388  3045
Orbcomm FM 09           
1 25116U 97084E   98014.20797838 -.00000115  00000-0  10000-4 0   139
2 25116  45.0267  79.6315 0004723 325.8805  34.1733 14.21712455  3049
Orbcomm FM 05           
1 25117U 97084F   98011.40515349 -.00009733  00000-0 -43835-2 0   129
2 25117  45.0180  92.6559 0006516 346.3962  15.7708 14.21155959  2645
Orbcomm FM 06           
1 25118U 97084G   98011.61462010 -.00009748  00000-0 -43835-2 0   125
2 25118  45.0217  91.6806 0004519  13.0211 347.0774 14.21240676  2675
Orbcomm FM 07           
1 25119U 97084H   98  6.41244524  .00000500  00000-0  22674-3 0    96
2 25119  45.0185 115.6553 0005283 318.0659  42.0240 14.21342831  1933

I would like to thank Wende Cover (Orbcomm media relations), Bob Vence
(Orbcomm Engineering), Eric Rosenberg (Orbcomm engineering), and JO1 Karalis
(USSPACECOM) for their help in getting this together and straightening out
the mess.

Good Hunting,

Larry Van Horn
Managing Editor
Satellite Times magazine

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