The Bayer designation stars - 25 Parsecs
Source
This model is generated from data obtained from the 'Preliminary Version of the 3rd Catalogue of Nearby Stars', Gliese W. and Jahreiss H. (Astron. Rechen-Institut, Heidelberg, 1991). The catalogue is listed at NASA's Astronomical Data Center as 5070a.
The data includes over 3800 stars with a trigonometric parallax >= 0.0390 arcsec (25 Parsecs). This model contains all the visible stars from the table (visual magnitude < 6).
Names
Only the stars with Bayer designations have been named. With all names showing, the stars themselves are hidden in the clutter.
The names of the stars were obtained from the following fields:
- Remarks (if a Bayer Letter/Constellation) *
- Giclas
- LHS
- OtherName
- Ident
*
A) Extraction of the Bayer letter and constellation from the
remarks field proved tricky as the field contains a variety
of other information in no fixed order. I searched each Remark
for Greek letters then extracted the letter, suffix (e.g. (2)) and
3 letter constellation name.
It will fail if it encounters a
(hypothetical) name such as OMI(10) Sig, as it assumes that the
digit only goes up to 9. In this case the extraction code
would return 'OMI(10) Si', omitting the last character.
In addition, the code does no 'back check' that would enable it to
detect the '50' in '50 UPS And'. This will return 'UPS And'.
B) I browsed the data file to check the abbreviations it used for
Greek letters, it listed every letter except Omega. I check for
'OME' irregardless.
The proper symbols for Greek letters have been used for all letters for which I could find a 'Courier' font equivalent. This is a random grab bag of letters (Alpha, but not Beta, Pi but not Theta...).
Stars
Color
Although the spectral class is listed in the data file, I've ignored it (it had even more variants than the Bayer/constellation) and instead used the absolute magnitude as a rough guide to the star's color.
- minimum mag RED to 4.79 (Sol's mag) YELLOW
- 4.79 to 3.79 WHITE
- 3.79 to maximum mag LIGHT BLUE
Multiples
Binary and Tertiary star systems are shown by placing the B and C stars further from Sol by 0.3 and 0.6 ly respectively. This leads to the peculiar situation that Rigil Kentaurus (Alpha Centauri A) appears closer to Proxima Centauri (about 0.19 ly), than it's own orbital star, Alpha Centauri B. Oh well, ya' get that..
Position
Celestial coordinates are given according to epoch 1950.
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