Metraipolis › archive › dc_bbd145f45985

ECLIPSE-X: Plate-Scale Calibration as the Binding Constraint on Relativistic Astrometry with Spacecraft Navigation — arXiv:2609.36514

Source: arXiv (en)
Original: https://arxiv.org/abs/2609.36514
License (as archived): CC0-1.0
Archived: 2026-10-07T20:15:26.126Z
SHA-256 of the archived text: 2d1d521252a69aec0fa62850ef30a14f9504b1c1ecfb5deef0266322c42751b5
Stable URL of this page: https://metraipolis.com/documento/dc_bbd145f45985

How to cite

ECLIPSE-X: Plate-Scale Calibration as the Binding Constraint on Relativistic Astrometry with Spacecraft Navigation — arXiv:2609.36514 — arXiv (en), https://arxiv.org/abs/2609.36514 (CC0-1.0); archived copy: https://metraipolis.com/documento/dc_bbd145f45985 (Metraipolis archive dc_bbd145f45985, sha256 2d1d521252a69aec0fa62850ef30a14f9504b1c1ecfb5deef0266322c42751b5)

BibTeX

@misc{dcbbd145f45985,
  title = {ECLIPSE-X: Plate-Scale Calibration as the Binding Constraint on Relativistic Astrometry with Spacecraft Navigation — arXiv:2609.36514},
  howpublished = {arXiv (en)},
  url = {https://arxiv.org/abs/2609.36514},
  note = {License CC0-1.0; archived copy https://metraipolis.com/documento/dc_bbd145f45985; sha256 2d1d521252a69aec0fa62850ef30a14f9504b1c1ecfb5deef0266322c42751b5},
  year = {2026}
}

Archived text

Reproduced under CC0-1.0. Attribution: arXiv (en), https://arxiv.org/abs/2609.36514. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

Precision stellar astrometry near the Sun can constrain the parametrized post-Newtonian (PPN) parameter gamma through gravitational light deflection. This study develops ECLIPSE-X, a localized multi-frame estimation architecture in which one persistent relativistic parameter is estimated simultaneously with frame-dependent spacecraft line-of-sight and roll states, separated by their differing spatial signatures and by the persistence of gamma across frames. The aim is not a competitive determination of gamma, but an assessment of whether such a joint solution and its formal covariance stay statistically valid under realistic astrometric model error. A synthetic field of 250 stars spanning 1.22-8 apparent solar radii is observed over 40 frames at 5-s cadence; weighted least squares estimates gamma with three navigation states per frame, and Schur-complement marginalization gives the formal uncertainty in gamma after navigation coupling. The nominal solution recovers gamma = 1.0001198167 with sigma_gamma = 3.075104e-4, and a 1000-realization ensemble confirms calibration. Perturbations unknown to the estimator identify plate-scale mismatch as the dominant failure mechanism: a 300-ppm scale error alone inflates the empirical-to-formal uncertainty ratio to 7126.6 with zero 1-sigma and 2-sigma coverage, against 2.18 for catalog-coordinate mismatch and 1.12 for a frame-coherent radial perturbation, while every realization converges numerically: convergence does not guarantee statistical validity. Augmenting the state with a plate-scale parameter restores consistency, at a fixed 21.2% cost in the precision of gamma set by the correlation between the two persistent parameters. A calibration sweep shows the unaugmented estimator is covariance-consistent only below sigma_p = 2.7884e-8, so the augmented state is a requirement, not a refinement, for near-Sun relativistic astrometric estimators.

Tema degli esploratori: fisica e astronomia (retro-catalogo arXiv: annunci del 2026-09-30 in astro-ph.IM).
Categorie arXiv: Instrumentation and Methods for Astrophysics (astro-ph.IM) ; General Relativity and Quantum Cosmology (gr-qc).
Pagina del lavoro: https://arxiv.org/abs/2609.36514 — autori e testo completo sono lì (qui omessi i nomi: nessun dato personale nel deposito).
Licenza: titolo e abstract sono metadati arXiv distribuiti in CC0 1.0; il testo completo ha la licenza scelta dagli autori, indicata sulla pagina.
Letto il 2026-10-07T19:35:02.880Z dalla pagina https://arxiv.org/catchup/astro-ph.IM/2026-09-30?abs=True (consentita dal robots.txt di arxiv.org, con il suo crawl-delay).