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WG3K > ANS 20.04.25 03:01l 14 Lines 1710 Bytes #178 (0) @ AMSAT
BID : ANS110.6
Read: GUEST
Subj: Changes to AMSAT TLE Distribution for April 18, 2025
Path: IW8PGT<IZ3LSV<I0OJJ<N6RME<CX2SA<OZ5BBS<PI8ZTM<PI8LAP<K5DAT<WW6Q<
WG3K
Sent: 250420/0045Z 16481@WG3K.#SMD.MD.USA.NOAM LinBPQ6.0.24
Two Line Elements or TLEs, often referred to as Keplerian elements or keps in the amateur community, are the inputs to the SGP4 standard mathematical model of spacecraft orbits used by most amateur tracking programs. Weekly updates are completely adequate for most amateur satellites. TLE bulletin files are updated daily in the first hour of the UTC day. New bulletin files will be posted immediately after reliable elements become available for new amateur satellites. More information may be found at https://www.amsat.org/keplerian-elements-resources/.
The following satellites have been added to this week's AMSAT TLE distribution:
HYDRA-W NORAD Cat ID 63490
HADES-ICM NORAD Cat ID 63492
Please note that Two/Three Line Element (TLE or 3LE) sets for spacecraft launched in the near future will not be available, and new formats will be used instead. The essence of the problem is that the US Space Force is running out of five digit numbers to catalog new satellites, see https://celestrak.org/NORAD/documentation/gp-data-formats.php for details.
AMSAT will continue to disseminate TLE for satellites currently in orbit indefinitely as we do now, but we seek comments regarding the best way to support the amateur satellites of the future.
For example, is there any need to augment the weekly e-mail with a new list in one or more of the new formats or is on line access via www.celestrak.orghttp://www.celestrak.org or www.amsat.orghttp://www.amsat.org sufficient? Please send your comments using the form at www.amsat.org/webmaster-contact/http://www.amsat.org/webmaster-contact/ on the AMSAT web site.
[ANS thanks Joe Fitzgerald, KM1P, AMSAT Orbital Elements Manager, for the above information.]
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