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J/A+A/516/A28       Star catalogue of Tycho Brahe (1627)        (Verbunt+, 2010)

Three editions of the star catalogue of Tycho Brahe. Machine-readable versions and comparison with the modern Hipparcos Catalogue. Verbunt F., van Gent R.H. <Astron. Astrophys. 516, A28 (2010)> =2010A&A...516A..28V
ADC_Keywords: Historical catalog ; Positional data Keywords: astrometry - history and philosophy of astronomy Abstract: Tycho Brahe completed his catalogue with the positions and magnitudes of 1004 fixed stars in 1598. This catalogue circulated in manuscript form. Brahe edited a shorter version with 777 stars, printed in 1602, and Kepler edited the full catalogue of 1004 stars, printed in 1627. We provide machine-readable versions of the three versions of the catalogue, describe the differences between them and briefly discuss their accuracy on the basis of comparison with modern data from the Hipparcos Catalogue. We also compare our results with earlier analyses by Dreyer (1916Obs....39..127D, On Tycho Brahe's manual of trigonometry) and Rawlins (1993BAAS...25.1335R, Atmospheric Clarity and Tycho's Fake Stars), finding good overall agreement. The magnitudes given by Brahe correlate well with modern values, his longitudes and latitudes have error distributions with widths of 2-arcmin, with excess numbers of stars with larger errors (as compared to Gaussian distributions), in particular for the faintest stars. Errors in positions larger than about 10-arcmin, which comprise about 15 per cent of the entries, are likely due to computing or copying errors. Description: We present in three data files the Machine-readable versions of three editions of Tycho Brahe's star catalogue. The main file KeplerE.dat contains the catalogue as published by Kepler in 1627 as part of the Tabulae Rudolphinae, with some emendations. The second file Variants.dat contains the data from other editions if different from the data in KeplerE.dat. These other editions are i) the Manuscript version of Brahe from 1598, as published by Dreyer in the Tychonis Brahe Dani Opera Omnia Vol. III (Kopenhagen, 1916), ii) the shorter version published by Brahe In the Astronomiae Instauratae Progymnasmata (1602), iii) the original (i.e. not emended) edition by Kepler (1627), iv) variants given by Kepler (1627) as `meus catalogus' or as `Piserus'. In addition to the data from the Historical catalogue, the machine-readable version contain the modern identification with a Hipparcos star and the latter's magnitude, and based on this identification the positional accuracy. The third file Names.dat contains the latin descriptions of the stars as given in Brahe's manuscript version (1598). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file keplere.dat 95 1007 Emended version of Kepler (1627) edition of Tycho Brahe Star Catalogue variant.dat 95 82 Variants on Kepler Emended version from other editions names.dat 95 1007 Descriptions of the stars, from the Manuscript version of the catalogue
See also: I/239 : The Hipparcos and Tycho Catalogues (ESA 1997) J/A+A/516/A29 : Star catalogue of Hevelius (1690) (Verbunt+, 2010) Byte-by-byte Description of file: keplere.dat variant.dat
Bytes Format Units Label Explanations
1- 4 I4 --- M ?=0 Sequence number in Manuscript Catalogue 6- 8 I3 --- B ?=0 Sequence number in Brahe 1602 edition 10- 13 I4 --- K ?=0 Sequence number in Kepler 1627 edition 15- 16 I2 --- C Sequence number of constellation in Kepler 18 A1 --- --- [=] 19- 21 A3 --- cst Abbreviation of constellation name 23- 24 I2 --- N Sequence number of star in constellation 26- 27 I2 30deg Elon.Z [1,12] Zodiacal sign of ecliptic longitude (1) 29- 30 I2 deg Elon.d [0,30] Degrees of ecliptic longitude (1) 32- 35 F4.1 arcmin Elon.m Arcminutes of ecliptic longitude (1) 37- 38 I2 deg Elat.d Degrees of ecliptic latitude (2) 40- 43 F4.1 arcmin Elat.m Arcminutes of ecliptic latitude (2) 45 A1 --- Elat.- [AB] Sign of ecliptic latitude, Australis (-) or Borealis (+) (2) 47 I1 --- VB Magnitude as given by Brahe; 9 for `nebulous' 48 A1 --- n_VB [.:] Magnitude qualifier (3) 50- 55 I6 --- HIP ? Hipparcos number of identification 58 I1 --- I [1,6] Quality of identification (4) 61 I1 --- D [0,5] Comparison flag with Dreyer (5) 63 I1 --- R [0,5] comparison flag with Rawlins (5) 65- 68 F4.1 mag Vmag ?=0 Magnitude of Hipparcos identification 70- 75 F6.1 min Dlon ?=0 Difference in longitude: Hipparcos-Brahe 77- 82 F6.1 arcmin Dlat ?=0 Difference in latitude: Hipparcos-Brahe 84- 89 F6.1 arcmin Delta ?=0 Offset between Brahe star and identification 92 A1 --- v.K K indicates variant from Kepler (1627) (6) 93 A1 --- v.P P indicates variant from Brahe (1602) (6) 94 A1 --- v.M M indicates variant from manuscript 1598 (6) 95 A1 --- v.I C/P indicates variant meus catalogus/Piserus (6)
Note (1): The ecliptic longitude (for the equinox of AD 1601.0) is given by λ = (Z-1)30 + Elon.d + Elon.m/60 Note (2): The ecliptic latitude (for the year AD 1601.0) is given by β = ±(Elat.d + Elat.m/60); (+ for Borealis, - for Australis) Note (3): Magnitude qualifier: : = brighter; . = fainter Note (4): Flag 'I' as follows: 1 = secure identification with nearest star 2 = secure identification, even though not nearest star 3 = probable identification 4 = possible identification 5 = not identified 6 = double entry Note (5): Comparison flags as follows: 0 = no identification given by Dreyer/Rawlins 1 = same identification given by Dreyer/Rawlins 2 = identification in Dreyer/Rawlins to alternative identification 3 = identification in Dreyer/Rawlins different from our identification 4 = identification in Rawlins different due to corrected position 5 = called `utter fake' by Rawlins Note (6): in variants.dat file only
Byte-by-byte Description of file: names.dat
Bytes Format Units Label Explanations
1- 4 I4 --- M ?=0 Sequence number in Manuscript Catalogue 6- 8 I3 --- B ?=0 Sequence number in Brahe 1602 edition 10- 13 I4 --- K ?=0 Sequence number in Kepler 1627 edition 16- 95 A80 --- Name Latin description of star in Manuscript 1598 (1)
Note (1): Mathematical symbols (square, triangle) from the manuscripts are indicated with LaTeX form ($, $△$); zodiac symbols from the manuscript are indicated with the wasysym form (\aries, \taurus, \gemini, \cancer, etc.)
Acknowledgements: Frank Verbunt, f.w.m.verbunt(at) Astron. Inst. Utrecht University, Netherlands
(End) Frank Verbunt [AIU Univ., Netherlands], Patricia Vannier [CDS] 05-Mar-2010
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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