Ted Molczan said > In partial response to Phil Clark's question, the two 57 deg inclination > element sets bear a superficial resemblance to the orbit of 89061D, which is > known to have broken up. Jonathan McDowell's compilation of U.N. orbit filings, > shows the periods and orbital dimensions of many such pieces. Perhaps this is as good a time as any to ask if there is interest in a large archive of TLEs I've been assembling. It's a superset of the materials available at Jonathan McDowell's site (he was kind enough to send me CD ROMs with his data), and currently contains something over 17 million TLEs. Possibly it would be useful for studying the long-term behavior of orbits or, as in the present instance, studying the appearance of "strange" TLEs in normal NORAD distributions. If there is interest, I'd be happy to zip the archive and send it out to requesters on a couple of CD ROMs. Since I don't want to get into the CD ROM manufacturing business in too serious a way (they take about 20 minutes a disk to produce), the offer is limited to six copies, probably on a first-come-first-served basis. If there is greater demand than I expect, I may prioritize the requests on some other basis than order of receipt. The price is $US 0.00 -- CD ROMs are cheap, and the postage isn't worth bothering about. I ask, however, that recipients be willing to distribute the data further if they find interested parties. If you'd like a copy, let me know by private e-mail. P.S.: Of course I'd be delighted to receive copies of TLE archives others might have. Here's the current contents of the archive, where the Znnnn names indicate the epochs of the TLEs in the files. Z1950_9 24,884 04-01-00 Z1960_9 15,817,087 04-29-00 Z1970_9 137,264,699 04-24-00 Z1980_2 83,747,807 04-28-00 Z1983_6 93,162,355 04-28-00 Z1987_9 154,719,886 04-29-00 Z1990 76,926,564 04-26-00 Z1991 85,254,884 04-26-00 Z1992 94,480,701 04-26-00 Z1993 93,565,606 04-26-00 Z1994 122,797,532 04-26-00 Z19950_1 100,765,518 04-26-00 Z19952_3 173,018,931 04-29-00 Z19960_1 162,215,911 05-01-00 Z19962_3 161,979,389 04-30-00 Z19970_1 199,951,037 04-24-00 Z19972_3 184,327,572 04-25-00 Z19980_1 185,145,103 04-25-00 Z19982_3 56,640,441 04-26-00 Z19990_1 78,663,299 04-25-00 Z19992_3 87,806,856 04-25-00 Z2000 100,751,079 05-01-00 22 file(s) 2,449,027,141 bytes ----------------------------------------------------------------- Unsubscribe from SeeSat-L by sending a message with 'unsubscribe' in the SUBJECT to SeeSat-L-request@lists.satellite.eu.org http://www2.satellite.eu.org/seesat/seesatindex.html
This archive was generated by hypermail 2b29 : Tue May 02 2000 - 08:34:56 PDT