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(hip 1) parallax ? I/337/tgas (2016)
http://forum.celestialmatters.org/viewtopic.php?f=2&t=879
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Author:  symaski62 [ Wed, 05-10-16, 13:22 GMT ]
Post subject:  (hip 1) parallax ? I/337/tgas (2016)

hip 1 3.45 to 4.55 to 7.19 parallax ?!

:(

http://simbad.u-strasbg.fr/simbad/sim-b ... 20%208.961

parallax => 3.54 => I/239/hip_main => The Hipparcos and Tycho Catalogues (ESA 1997)

parallax => 4.55 => I/311/hip2 => Hipparcos, the New Reduction (van Leeuwen, 2007)

parallax => 7.19 => I/337/tgas => Gaia DR1 (Gaia Collaboration, 2016)

DAFUQ ! parallax ?! :shock:

facepalm !

Author:  ajtribick [ Wed, 05-10-16, 21:11 GMT ]
Post subject:  Re: (hip 1) parallax ? I/337/tgas (2016)

Also bear in mind the uncertainties.

XHIP gives 4.55±1.33 mas
TGAS gives 7.19±0.68 mas

In units of the error on the XHIP parallax, this is a 2σ difference. 2σ differences should occur often enough that several thousand stars in the XHIP catalogue likely have true parallaxes outside the 2σ range.

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