The Hipparcos–Gaia Catalog of Accelerations

By Timothy D. Brandt. Astrophysical Journal Supplement Series, 2018

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This paper presents a cross-calibrated catalog of Hipparcos and Gaia astrometry to enable their use in measuring changes in proper motion, i.e., accelerations in the plane of the sky. The final catalog adopts the reference frame of the second Gaia data release (DR2) and locally cross-calibrates both the scaled Hipparcos–Gaia DR2 positional differences and the Hipparcos proper motions themselves to this frame. This gives three nearly independent proper motion measurements per star, with the scaled positional difference usually being the most precise. We find that a linear combination of the two Hipparcos reductions is superior to either reduction on its own and address error inflation for both Hipparcos and Gaia DR2. Our adopted error inflation is additive (in quadrature) for Hipparcos and multiplicative for Gaia. We provide the covariance matrices along with the central epochs of all measurements. Our final proper motion differences are accurately Gaussian with the appropriate variances and are suitable for acceleration measurements and orbit fitting. The catalog is constructed with an eye toward completeness; it contains nearly 98% of the Hipparcos stars. It also includes a handful of spurious entries and a few stars with poor Hipparcos reductions that the user must vet by hand. Statistical distributions of accelerations derived from this catalog should be interpreted with caution.

Subfields: Astronomy and Astrophysics, Molecular Biology

View Paper: https://www.semanticscholar.org/paper/98a015af5ba435261c173e5b34a9bbe5cdc5dda4

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Citations in the corpus

Gaia Early Data Release 3 (2020, background): “The problem was confirmed by Brandt (2018) in a comparison with proper motions calculated from the position differences between the DR2 and HIPPARCOS catalogues, and by Lindegren (2020a,b) in a comparison with radio-interferometric (VLBI) observations of bright radio stars.”
The Hipparcos–Gaia Catalog of Accelerations: Gaia EDR3 Edition (2021, background): “A cross-calibration is required first to enforce a common reference frame and to ensure Gaussian residuals with the appropriate variance (Brandt 2018, hereafter B18).”
Stellar and substellar companions of nearby stars from Gaia DR2 (2018, methodology): “J/A+A/623/A72 Wielen et al. (1999), Jorissen et al. (2004), Makarov & Kaplan (2005), Frankowski et al. (2007), Makarov et al. (2008), Brandt (2018) and Brandt et al. (2018).”
Unresolved stellar companions with Gaia DR2 astrometry (2020, methodology): “…or unresolved companions can induce a shift of the barycentre with respect to the photocentre which can be detected when proper motion estimates from two or more epochs are compared in a method known as the proper motion anomaly (PMa; see e.g. Bessel 1844; Brandt 2018; Kervella et al. 2019a, b).”