Tag Archive for 'yale'

[Stellar Mapping] Historical Datasets (Yale & Gliese3)

As part of this weekend’s update to my Stellar Mapping page (more details about that will be in the next post), I’ve decided to move the Historical datasets (Yale and Gliese3) onto a blog post since they’re no longer accurate and probably aren’t being used much anyway (there’s a link from the Stellar Mapping page to this blog post). So, here they are!

Historical Datasets

Historical databases should not be considered “accurate” by modern standards, and have been largely superseded by the ones listed in the “Accurate Datasets” section. The full Yale and Gliese catalogues have been clipped at 300 ly from Sol.

Yale Trigonometric Parallaxes, Fourth Edition: The Yale catalogue (a.k.a the General Catalogue of Trigonometric Parallaxes, or GCTP) is a historical dataset that was one of the most accurate near star catalogues before Hipparcos, with parallax measurements taken from the ground-based observations. It includes many fainter stars that are not in the Hipparcos catalogue, but the distance accuracy is much lower. It also include many stars that are in the Hipparcos catalogue, but because of the lower accuracy they are somewhat shifted from their Hipparcos-derived positions – the difference increases with distance from Sol. However, the Yale catalogue does include Spectral data for most stars. As such, the Yale and Hipparcos catalogues should NOT be combined.

Source: http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=I/238A/picat.
Number of star systems: 6,051
Distance range: 22.8 – 300 lightyears from Sol.
Accuracy: Positional data are less accurate than Hipparcos, but spectral data is included. Physical data are not accurate. All stars are listed as single stars.

 

Gliese Nearby Stars, Preliminary 3rd Version: The Gliese catalogue is one of the “classic” historical star catalogues – it was updated in 1991, and includes all stars known at the time within 25 pc of Sol, and a few that are further out. It has low accuracy, but again includes some of the dimmer stars that Hipparcos does not include. The 2300AD star map is apparently based on the 2nd version of this catalogue.

Source: http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=V/70A.
Number of star systems: 3,667
Distance range: 22.8 – 300 lightyears from Sol.
Accuracy: Positional data are less accurate than Hipparcos, but spectral data is included. Physical data are not accurate. All stars are listed as single stars.