Discovery HIP 99770 b was discovered by a team led by Thayne Currie, Mirek Brandt, and Tim Brandt using the Subaru Telescope on Mauna Kea. The comet reaches perihelion 0.1 days earlier than. HIP 99770 b is the first joint direct imaging + astrometric discovery of an extrasolar planet and the first planet discovered using precision astrometry from the Gaia mission. The Pan-STARRS Data Release 2 (DR2) astrometric system is tied to the Gaia DR1 coordinate frame with a systematic uncertainty of ∼5 mas. Gareth Williams found astrometry of 2006 G1 in PanSTARRS data from 2016 January 18.57 and February 14. The bright-star systematic error floor for individual astrometric measurements is 16 mas. The astrometric calibration compensates for similar systematic effects so that positions, proper motions, and parallaxes are reliable as well. For bright stars, the systematic error floor for individual measurements is (σ g, σ r, σ i, σ z, σ y) = (14, 14, 15, 15, 18) mmag. Using external comparisons, we demonstrate that the resulting photometric system is consistent across the sky to between 7 and 12.4 mmag depending on the filter. The photometric goals were to reduce the systematic effects introduced by the camera and detectors, and to place all of the observations onto a photometric system with consistent zero-points over the entire area surveyed, the ≈30,000 deg 2 north of δ = -30°. Include dependency graph for astrometry.h: This graph shows which files directly or indirectly include this file: Go to the source code of this file. We present the details of the photometric and astrometric calibration of the Pan-STARRS1 3π Survey.
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