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4 votes
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Papers/studies about shedding aerodynamic lifting surfaces with booster

Some hits from a shallow dive into NTRS - Performance estimates for space shuttle vehicles using a hydrogen or a methane fueled turboramjet powered first stage Second stage is winged, but otherwise ...
4 votes
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Are there any sources with high-confidence state vectors for GRAIL-A?

What you want is the SPICE Kernels (SPK) from https://pds-geosciences.wustl.edu/grail/grail-l-lgrs-5-rdr-v1/grail_1001/spk/ . They are named like sssttaaYYYY_DDD_yyyy_ddd.spk, where ...
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8 votes

Are there any sources with high-confidence state vectors for GRAIL-A?

Partial answer too long for several comments: tl;dr: The drift you are seeing is just as likely (if not more) to be a difference in your acceleration models as it is an "inaccuracy" (...
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