THANKS Re: Where did the TLEs go for BY70-1?
Greetings Mac,
Thanks for this!
The AMSAT ftp site isn't updated frequently enough for the deteriorating orbit and a single precision PLAN13 implementation on the ATmega1280.
As an example here's the CELESTRAK output:
BY70-1 1 41909U 16083C 17029.24424671 .00506735 24288-5 70240-3 0 9991 2 41909 97.5768 109.7306 0160558 244.2616 114.2002 15.85900257 5044
Here's the AMSAT record sampled from the same time.
BY70-1 1 41909U 16083C 17026.84471594 .00329730 24344-5 49404-3 0 9999 2 41909 97.5781 107.0760 0167800 253.3870 105.1424 15.83446051 4663
As expected, atmospheric drag has the largest effect on the semi-major axis, eccentricity, and argument of perigee. Alas it won't be long now. Still haven't gotten a confirmed QSO!
Best Todd
Mac A. Cody maccody at att.net Sun Jan 29 02:43:52 UTC 2017 Previous message: [amsat-bb] Where did the TLEs go for BY70-1? Next message: [amsat-bb] NJ7H-9 Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] Todd,
Mark KK6OTJ told me that you can find the latest TLEs for BY70-1 by using the SATCAT search function at http://www.celestrak.com/satcat/search.asp Search using the name BY70-1.
73,
Mac / AE5PH
A suggestion would be to contact Tim through his website, politely explain that BY70-1 is of interest to amateurs, and request that he include it in the amateur.txt list because you need frequent updates. In the past he has been very responsive.
73s,
Alan WA4SCA
<-----Original Message----- <From: AMSAT-BB [mailto:amsat-bb-bounces@amsat.org] On Behalf Of Todd Deckard <Sent: Sunday, January 29, 2017 6:48 AM <To: amsat-bb@amsat.org <Subject: [amsat-bb] THANKS Re: Where did the TLEs go for BY70-1? < <Greetings Mac, < <Thanks for this! < <The AMSAT ftp site isn't updated frequently enough for the deteriorating orbit and a single precision <PLAN13 implementation on the ATmega1280. < <As an example here's the CELESTRAK output: < <BY70-1 <1 41909U 16083C 17029.24424671 .00506735 24288-5 70240-3 0 9991 <2 41909 97.5768 109.7306 0160558 244.2616 114.2002 15.85900257 5044 < <Here's the AMSAT record sampled from the same time. < <BY70-1 <1 41909U 16083C 17026.84471594 .00329730 24344-5 49404-3 0 9999 <2 41909 97.5781 107.0760 0167800 253.3870 105.1424 15.83446051 4663 < <As expected, atmospheric drag has the largest effect on the semi-major axis, eccentricity, and argument <of perigee. Alas it won't be long now. Still haven't gotten a confirmed QSO! < <Best <Todd < < <>Mac A. Cody maccody at att.net <>Sun Jan 29 02:43:52 UTC 2017 <>Previous message: [amsat-bb] Where did the TLEs go for BY70-1? <>Next message: [amsat-bb] NJ7H-9 <>Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] <>Todd, < <>Mark KK6OTJ told me that you can find the latest TLEs for BY70-1 by using <>the SATCAT search function at http://www.celestrak.com/satcat/search.asp <>Search using the name BY70-1. <> <>73, <> <>Mac / AE5PH < < <_______________________________________________ <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
I worked BY70-1 during the 0439 UTC pass this evening using the TLEs provided through AMSAT.org. I had a successful QSO with W5ACM in EL29 (I'm in EM12). It became obvious, though, that BY70-1 arrived sooner than the TLEs indicated. It was very difficult to maintain proper aiming and Doppler shift correction enable proper communication with BY70-1 during the times around TCA.
For those interested, I sent the email below to Dr. Kelso at Celestrak.com. Hopefully, something will be done shortly.
73,
Mac / AE5PH
Dr. Kelso,
First, let me express my thanks for your excellent web site and TLE data service. I have used it numerous times over the years to learn more about satellite dynamics and, in recent months, to obtain predictions for amateur satellites for communications.
There has been a lot of interest in the amateur satellite community regarding the recently-launched Chinese cubesat BY70-1. While it is sad to know that it will reenter in a few weeks, ham radio operators have been communicating through BY70-1 as much as possible.
Since BY70-1 has exited the listing of satellites launched in the last 30 days, it has become difficult to load timely TLE data into the commonly available amateur satellite tracking softwares. I was wondering if it would be possible to place the TLE data for BY70-1 into the Amateur Radio or CubeSats listing so that timely updates become available again. This would only be to be done for the short term, as it is currently estimated that BY70-1 will reenter about February 22, 2017.
Thanks for your consideration.
Regards,
Mac Cody / AE5PH
On 01/29/2017 07:21 AM, Alan wrote:
A suggestion would be to contact Tim through his website, politely explain that BY70-1 is of interest to amateurs, and request that he include it in the amateur.txt list because you need frequent updates. In the past he has been very responsive.
73s,
Alan WA4SCA
<-----Original Message----- <From: AMSAT-BB [mailto:amsat-bb-bounces@amsat.org] On Behalf Of Todd Deckard <Sent: Sunday, January 29, 2017 6:48 AM <To: amsat-bb@amsat.org <Subject: [amsat-bb] THANKS Re: Where did the TLEs go for BY70-1? < <Greetings Mac, < <Thanks for this! < <The AMSAT ftp site isn't updated frequently enough for the deteriorating orbit and a single precision <PLAN13 implementation on the ATmega1280. < <As an example here's the CELESTRAK output: < <BY70-1 <1 41909U 16083C 17029.24424671 .00506735 24288-5 70240-3 0 9991 <2 41909 97.5768 109.7306 0160558 244.2616 114.2002 15.85900257 5044 < <Here's the AMSAT record sampled from the same time. < <BY70-1 <1 41909U 16083C 17026.84471594 .00329730 24344-5 49404-3 0 9999 <2 41909 97.5781 107.0760 0167800 253.3870 105.1424 15.83446051 4663 < <As expected, atmospheric drag has the largest effect on the semi-major axis, eccentricity, and argument <of perigee. Alas it won't be long now. Still haven't gotten a confirmed QSO! < <Best <Todd < < <>Mac A. Cody maccody at att.net <>Sun Jan 29 02:43:52 UTC 2017 <>Previous message: [amsat-bb] Where did the TLEs go for BY70-1? <>Next message: [amsat-bb] NJ7H-9 <>Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] <>Todd, < <>Mark KK6OTJ told me that you can find the latest TLEs for BY70-1 by using <>the SATCAT search function at http://www.celestrak.com/satcat/search.asp <>Search using the name BY70-1. <> <>73, <> <>Mac / AE5PH < < <_______________________________________________ <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
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
When will we have a closer idea of when it may re-enter?
It would be neat to try to catch it on video.
Joe WB9SBD Sig The Original Rolling Ball Clock Idle Tyme Idle-Tyme.com http://www.idle-tyme.com On 1/29/2017 6:48 AM, Todd Deckard wrote:
Greetings Mac,
Thanks for this!
The AMSAT ftp site isn't updated frequently enough for the deteriorating orbit and a single precision PLAN13 implementation on the ATmega1280.
As an example here's the CELESTRAK output:
BY70-1 1 41909U 16083C 17029.24424671 .00506735 24288-5 70240-3 0 9991 2 41909 97.5768 109.7306 0160558 244.2616 114.2002 15.85900257 5044
Here's the AMSAT record sampled from the same time.
BY70-1 1 41909U 16083C 17026.84471594 .00329730 24344-5 49404-3 0 9999 2 41909 97.5781 107.0760 0167800 253.3870 105.1424 15.83446051 4663
As expected, atmospheric drag has the largest effect on the semi-major axis, eccentricity, and argument of perigee. Alas it won't be long now. Still haven't gotten a confirmed QSO!
Best Todd
Mac A. Cody maccody at att.net Sun Jan 29 02:43:52 UTC 2017 Previous message: [amsat-bb] Where did the TLEs go for BY70-1? Next message: [amsat-bb] NJ7H-9 Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] Todd, Mark KK6OTJ told me that you can find the latest TLEs for BY70-1 by using the SATCAT search function at http://www.celestrak.com/satcat/search.asp Search using the name BY70-1.
73,
Mac / AE5PH
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
participants (4)
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Alan -
Joe -
Mac A. Cody -
Todd Deckard