The Importance of Positioning Isolated Neutron Stars: the Case of Geminga

Abstract

We report on a multi-step procedure aimed at measuring, with high accuracy, the coordinates of Geminga within the Hipparcos and Tycho systems. Starting with an astrometric plate containing few tens of Tycho stars and 4 Hipparcos ones, we went through four intermediate steps to measure, to about 0.040 arcsec (per coordinate), the absolute position of Geminga… (More)

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