Hipparcos Positioning of Geminga : How and Why

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dc.creatorCaraveo, P. A.
dc.creatorLattanzi, M. G.
dc.creatorMassone, G.
dc.creatorMignani, R. P.
dc.creatorMakarov, V. V.
dc.creatorPerryman, M. A. C.
dc.creatorBignami, G. F.
dc.date1997-11-04
dc.date.accessioned2026-07-07T02:24:55Z
dc.date.available2026-07-07T02:24:55Z
dc.descriptionAccuracy in the absolute position in the sky is one of the limiting factors for pulsar timing, and timing parameters have a direct impact on the understanding of the physics of Isolated Neutron Stars (INS). We report here on a high-accuracy measurement of the optical position of Geminga (V=25.5), the only known radio-quiet INS. The procedure combines the Hipparcos and Tycho catalogues, ground-based astrometric data,and Hubble Space Telescope (HST) Wide Field Planetary Camera (WFPC2) images, to yield Geminga's absolute position to within ~40 mas (per coordinate). Such a positional accuracy, unprecedented for the optical position of a pulsar or an object this faint, is needed to combine in phase gamma-ray photons collected over more than 20 years, i.e. over 2.5 billions of star' revolutions. Although quite a difficult task, this is the only way to improve our knowledge of the timing parameters of this radio silent INS.
dc.description4 pages, Latex, 2 postscript figures, Accepted for publication in Astronomy and Astrophysics
dc.identifierhttps://arxiv.org/abs/astro-ph/9711029
dc.identifierhttp://arxiv.org/abs/astro-ph/9711029
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/11740
dc.subjectAstrophysics
dc.titleHipparcos Positioning of Geminga : How and Why
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