The space-track development team has added a new class (tle_latest) to help us retrieve the whole TLE catalog. "This will return the most recent TLE for each object in the catalog under nominal system load in about 30 seconds. You can get up to 5 TLEs for each object by varying the ORDINAL between 1-5 or get all 5 by omitting ORDINAL altogether." This query would return all TLEs for all objects (1 TLE per NORAD_CAT_ID): https://beta.space-track.org/basicspacedata/query/class/tle_latest/format/tl e/ORDINAL/1 It returns data very fast. However space-track development team requested not to abuse the usage of the new class: "Please understand that you share this database with thousands of others in the space community and we request that you do not craft scripts that will repeatedly hit this URL in short time spans. Given the pace of updates to the database, it is reasonable to limit your queries to only once every 4 hours. Also, please select a random minute for your script to run so all queries don't converge at the top or the bottom of the hour." Thank you Space-Track! Chip -----Original Message----- From: seesat-l-bounces+ciprian=sufitchi.com@satobs.org [mailto:seesat-l-bounces+ciprian=sufitchi.com@satobs.org] On Behalf Of Ryan Shepperd Sent: Friday, August 31, 2012 11:49 PM To: satelliet lijst (SeeSat) Subject: Re: Space Track API - Problems Marco I agree with you that no one needs to download the entire catalog every few hours; however, they might need to download the changes that often. The missing point is that there are use cases beyond visual satellite observations. I can use fairly ancient TLEs to catch a satellite with binoculars, but that's not the case when I am at my day job. Satellite operators need more timely space situational awareness data than what is required to observe a satellite. I often need to know if another operator's satellite has been maneuvering recently or if an object has displayed recent out-gassing events. These data are of course supplemental to more accurate information available on space-track to authorized users, but they are nevertheless useful. For my job, I download the alldata files once a day and the am/pm last-update files twice a day (at home, I only download them every few weeks). The new interface promises to be more useful for my job in that I could, without wasting anyone's bandwidth, query the catalog for changes a little more often. -Ryan ________________________________ From: Marco Langbroek <marco.langbroek@online.nl> To: ciprian@sufitchi.com; satelliet lijst (SeeSat) <SeeSat-L@satobs.org> Sent: Friday, August 31, 2012 6:23 AM Subject: Re: Space Track API - Problems Op 31-8-2012 10:21, Ciprian Sufitchi schreef: > Or leave the API the way it is now, but keep generating the TLE > bulk file once every 6 hours or so. Maybe I am missing something here. I don't see at all why you'd need such frequent full database updates. One full catalogue download a day is MORE than adequate to generate adequate predictions or check sightings. In case of following objects near decay, or newly launched objects, the elements of these can better be retrieved short before the intended observation via the option to retrieve one or a few catalogue number elements. I download the bulk tle files 1 or 2 times a week at best, and that is more than adequate. - Marco ----- Dr Marco Langbroek - SatTrackCam Leiden, the Netherlands. e-mail: sattrackcam@langbroek.org Cospar 4353 (Leiden): 52.15412 N, 4.49081 E (WGS84), +0 m ASL Cospar 4354 (De Wilck): 52.11685 N, 4.56016 E (WGS84), -2 m ASL Station (b)log: http://sattrackcam.blogspot.com Twitter: @Marco_Langbroek ----- _______________________________________________ Seesat-l mailing list http://mailman.satobs.org/mailman/listinfo/seesat-l -------------- next part -------------- An HTML attachment was scrubbed... URL: http://mailman.satobs.org/mailman/private/seesat-l/attachments/20120831/1e61 103e/attachment.html _______________________________________________ Seesat-l mailing list http://mailman.satobs.org/mailman/listinfo/seesat-l _______________________________________________ Seesat-l mailing list http://mailman.satobs.org/mailman/listinfo/seesat-l
This archive was generated by hypermail 2b29 : Sat Sep 01 2012 - 04:20:58 UTC