![]() The current orbit shows it coming to perihelion in 2023 I will speculate wildly about possible prospects for this comet in tomorrow’s Sky Notes during the meeting at Burlington House. This is an image of it taken from Chelmsford a few minutes ago. The Pan-STARRS Data Release 2 (DR2) astrometric system is tied to the Gaia DR1 coordinate frame with a systematic uncertainty of ∼5 mas. Newly discovered C/2017 K2 (PANSTARRS) is currently around 16AU from the Sun and mag 19 or so. 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. This article describes the photometric and. 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. The Pan-STARRS 1 3 survey has produced photometry and astrometry covering the 30,000 square degrees >30. 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°. With single-epoch astrometry of 10 milliarcseconds, these observations will yield parallaxes for stars within 100 pc and proper motions out to several hundred. We present the details of the photometric and astrometric calibration of the Pan-STARRS1 3π Survey.
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