Astrometry in Wide-field Surveys

Abstract

We present a robust and fast algorithm for performing astrometry and source cross-identification on two dimensional point lists, such as between a catalogue and an astronomical image, or between two images. The method is based on minimal assumptions: the lists can be rotated, magnified and inverted with respect to each other in an arbitrary way. The algorithm is tailored to work efficiently on wide fields with large number of sources and significant non-linear distortions, as long as the distortions can be approximated with linear transformations locally, over the scale-length of the average distance between the points. The procedure is based on symmetric point matching in a newly defined continuous triangle space that consists of triangles generated by an extended Delaunay triangulation. Our software implementation performed at the 99.995% success rate on ~260,000 frames taken by the HATNet project.

Comments: accepted for publication in PASP (9 pages, 5 figures); see http://www.hatnet.hu/software (www.hatnet.hu/software) for software

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• Wide-field millimagnitude photometry with HAT: A Tool for Extra-solar Planet Detection
• TrES-1: The Transiting Planet of a Bright K0V Star
• Representations of celestial coordinates in FITS
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• HAT-P-20b--HAT-P-23b: Four Massive Transiting Extrasolar Planets
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• HAT-P-13b,c: a transiting hot Jupiter with a massive outer companion on an eccentric orbit
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• HAT-P-5b: A Jupiter-like hot Jupiter Transiting a Bright Star
• HAT-P-6b: A Hot Jupiter transiting a bright F star
• HATNet Field G205: Follow-Up Observations of 28 Transiting-Planet candidates and Confirmation of the Planet HAT-P-8b
• HAT-P-17b,c: A Transiting, Eccentric, Hot Saturn and a Long-period, Cold Jupiter
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• HAT-P-30b: A transiting hot Jupiter on a highly oblique orbit
• HAT-P-9b: A Low Density Planet Transiting a Moderately Faint F star
• Refined stellar, orbital and planetary parameters of the eccentric HAT-P-2 planetary system
• HAT-P-4b: A metal-rich low-density transiting hot Jupiter
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• HAT-P-15b: A 10.9-day Extrasolar Planet Transiting a Solar-type Star
• CCD time-series photometry of the globular cluster NGC 6981: Variable star census and physical parameter estimates
• HAT-P-10b: A light and moderately hot Jupiter transiting a K dwarf
• Independent confirmation and refined parameters of the hot Jupiter XO-5b
• HAT-P-25b: a Hot-Jupiter Transiting a Moderately Faint G Star
• HAT-P-31b,c: A Transiting, Eccentric, Hot Jupiter and a Long-Period, Massive Third-Body
• HAT-P-24b: An inflated hot-Jupiter on a 3.36d period transiting a hot, metal-poor star
• DIVE in the cosmic web: voids with Delaunay Triangulation from discrete matter tracer distributions
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• Transit Search from Antarctica and Chile - Comparison and Combination
• Pushing the limits: K2 observations of the trans-Neptunian objects 2002 GV31 and (278361) 2007 JJ43
• Discovery of WASP-65b and WASP-75b: Two Hot Jupiters Without Highly Inflated Radii
• Asymmetric streaming motion in the Galactic bulge X-shaped structure revealed by the OGLE-III proper motions
• Image Subtraction Reduction of Open Clusters M35 & NGC 2158 In The K2 Campaign-0 Super-Stamp
• A Variable Star Census in a Perseus Field
• Variable stars in the bulge globular cluster NGC 6401
• The HATNet and HATSouth Exoplanet Surveys
• The Berlin Exoplanet Search Telescope II. Catalog of Variable Stars. I. Characterization of Three Southern Target Fields
• The WEAVE acquisition and guiding software: pattern recognition-based acquisition and multi-fibre guiding
• Exploring the crowded central region of 10 Galactic globular clusters using EMCCDs. Variable star searches and new discoveries