AO 91 identification
All,
Currently only three TLE sets have been published for the five Cubesats that were launched with JPSS 1. Now 18SPCS claims that JPSS 1 (soon to be called NOAA 20) is object 43013, that MiRaTa is object 43014 and that Buccaneer RRM is object 43015.
Detailed doppler measurements show that AO 91 almost certainly is object 43016 (2017-073D). But since two TLE sets are still missing, we shall have to wait to be absolutely sure.
73, Nico PA0DLO
All,
The missing two TLE sets have now been published by 18SPCS. The reason it took so long is probably that it was hard to detect all three 1U Cubesats with a distance between them of only a few kilometers. Since they are now less than 2 seconds apart, it is not yet possible to determine which one is AO 91.
So AO 91 is either object 43016, 43017 or 43018. For the time being you can use any of the TLE sets for these three objects.
73, Nico PA0DLO
On 19-11-17 15:26, Nico Janssen wrote:
All,
Currently only three TLE sets have been published for the five Cubesats that were launched with JPSS 1. Now 18SPCS claims that JPSS 1 (soon to be called NOAA 20) is object 43013, that MiRaTa is object 43014 and that Buccaneer RRM is object 43015.
Detailed doppler measurements show that AO 91 almost certainly is object 43016 (2017-073D). But since two TLE sets are still missing, we shall have to wait to be absolutely sure.
73, Nico PA0DLO
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As noted the objects are still too close to call who is who.
For the time being, I will continue to use NORAD CAT ID 43015 until it becomes obvious that 43016, 43017, or 43018 is the preferred TLE set. I do not want to change CAT IDs any more than necessary.
The AO-91 team is still very happy with object 43015 TLE, but as is normal in these tight groupings, a change is also very probable.
Thanks Nico!
Ray Hoad WA5QGD Orbital Elements Manager
-----Original Message----- From: Nico Janssen [mailto:hamsat@xs4all.nl] Sent: Sunday, November 19, 2017 15:45 To: AMSAT amsat-bb@amsat.org; Ray Hoad ray.hoad@mypbmail.com Subject: Re: [amsat-bb] AO 91 identification
All,
The missing two TLE sets have now been published by 18SPCS. The reason it took so long is probably that it was hard to detect all three 1U Cubesats with a distance between them of only a few kilometers. Since they are now less than 2 seconds apart, it is not yet possible to determine which one is AO 91.
So AO 91 is either object 43016, 43017 or 43018. For the time being you can use any of the TLE sets for these three objects.
73, Nico PA0DLO
On 19-11-17 15:26, Nico Janssen wrote:
All,
Currently only three TLE sets have been published for the five Cubesats that were launched with JPSS 1. Now 18SPCS claims that JPSS 1 (soon to be called NOAA 20) is object 43013, that MiRaTa is object 43014 and that Buccaneer RRM is object 43015.
Detailed doppler measurements show that AO 91 almost certainly is object 43016 (2017-073D). But since two TLE sets are still missing, we shall have to wait to be absolutely sure.
73, Nico PA0DLO
Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
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Ray Hoad