Fwd: [Orekit] [Orekit usage] Project Persephone - revival and improvement of SpriteOrbits

[Michael Turner]

I've proposed that a rework of SpriteOrbits could help calibrate one of their drag models. Some good questions were raised, mainly about accuracy of tracking. Since I don't have much of a sense of this myself, I thought I'd ask the ground station list members.

Regards,
Michael Turner
Executive Director
Project Persephone
1-25-33 Takadanobaba
Shinjuku-ku Tokyo 169-0075
Mobile: +81 (90) 5203-8682

tur...@projectpersephone.org

Understand - http://www.projectpersephone.org/

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Donate - http://www.patreon.com/ProjectPersephone

Volunteer - https://github.com/ProjectPersephone 

"Love does not consist in gazing at each other, but in looking outward together in the same direction." -- Antoine de Saint-Exupéry

---------- Forwarded message ---------
From: Luc Maisonobe <nor...@orekit.org>
Date: Wed, Aug 22, 2018 at 6:32 PM
Subject: [Orekit] [Orekit usage] Project Persephone - revival and improvement of SpriteOrbits
To: <michael.eu...@gmail.com>

luc August 22

This is an interesting project. I guess several Orekit users could help (at least I am interested, despite
I have very few time available). I have two questions, though:

• how will the sprites be tracked?
• how many sprites will be released?

If only TLE are available for the sprites, I’m not sure we will get accurate calibration. TLE are a mean model
with limited accuracy and as the sprites will be released as a swarm, there may be some confusion between each individual sprite at the beginning, when they are close to each other.

If some ground system may track the signal from the sprites (I think they at least broadcast a unique identifier), then maybe we could get some measurements (Doppler for example) and could use Orekit orbit determination feature directly. It was not available in 2014 but is now fully operational.

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