File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file ulughbeg_h.dat 147 1143 Ulugh Beg's catalog from Hyde ulughbeg_s.dat 147 1143 Ulugh Beg's catalog from Sharpe ulughbeg_b.dat 167 1130 Ulugh Beg's catalog from Baily ulughbeg_k.dat 160 1018 Ulugh Beg's catalog from Knobel cross_b.dat 41 1025 Identifications according to Baily cross_k.dat 60 1056 Identifications according to Knobel -------------------------------------------------------------------------------- Byte-by-byte Description of file: ulughbeg_h.dat ulughbeg_s.dat ulughbeg_b.dat ulughbeg_k.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 4 I4 --- UNo [1/1018]? Unique star number (1) 6- 8 A3 --- UCon ?Ulugh Beg constellation 9 A1 --- UInf [~]? ~ if 'informis' 10- 11 I2 --- UNum ?Ulugh Beg number in constellation 12 A1 --- w_Beg [*]? Note about this entry (2) 13- 14 I2 --- LO.z [0/11]? Longitude 1437-07-05 Zodiac sign (3) 15 A1 --- w_LO [*/JPS]? Warning about longitude (4) 16- 17 I2 deg LO.d ?Longitude (degrees) within zodiac sign 19- 20 I2 arcmin LO.m ?Longitude (minutes) 22 A1 --- LA.- [*+-]? Latitude sign (5) 23- 24 I2 deg LA.d ?Latitude (degrees) 25 A1 --- w_LA [*/JPS]? Warning about latitude (6) 26- 27 I2 arcmin LA.m ?Latitude (minutes) 29- 31 A3 --- Mag Magnitude or magnitude range (7) 32 A1 --- MagMod [pm]? Magnitude modifier (7) 33 A1 --- w_Mag [*JPS]? Warning about magnitude (8) -------------------------------------------------------------------------------- Note (1): This is the sequential star number from Baily's edition of Ulugh Beg's catalogue, adopted by Knobel except in Piscis Austrinus where the numbering follows Knobel. Note (2): In Baily's version, * here indicates that there is a note about this star in the Notes section pp. 119-125. Note (3): The degrees part of the ecliptic longitude is expressed by two components: the zodiac sign, an integer from 0 (Aries) to 11 (Pisces), and the offset in degrees (in the range [0, 30[) within the zodiac sign. The degrees part of the ecliptic longitude is therefore 30 * Lo.z + Lo.d. Note (4): In Knobel's version, * here means that the longitude is probably derived from Ptolemy; / means that the star was not observed by Ulugh Beg (position in italics in the text). Note (5): A * represents an unknown latitude sign (e.g. Leo 10 in Baily's version). Note (6): In Knobel's version, * here means that the latitude is probably derived from Ptolemy and / means that the star was not observed by Ulugh Beg (position in italics in the text). Note (7): The magnitude field consists of a single integer or, in Knobel's version, an integer range such as 3-4 or 4-3 used to capture the 'm' or 'p' (for "magna" and "parva") modifiers. In Hyde's and Sharpe's versions, these modifiers are captured in column 32. Baily did not capture these nuances, which he regrets (p. 27 in his Preface to Ulugh Beigh's Catalogue). Note (8): In Knobel's version, * here indicates that the magnitude is taken from Al Sufi's catalog. -------------------------------------------------------------------------------- Byte-by-byte Description of file: cross_b.dat cross_k.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 4 I4 --- UNo [1/1018]? Unique star number (1) 6- 8 A3 --- UCon ?Ulugh Beg constellation 9 A1 --- UInf [~]? ~ if 'informis' 10- 11 I2 --- UNum ?Ulugh Beg number in constellation 12 A1 --- NoId [*+?]? Identification issue (2) 13- 15 A3 --- BCon ?Bayer constellation 17- 19 A3 --- BLet ?Bayer letter in constellation 21 I1 --- BInd ?Bayer index 23- 25 A3 --- FCon ?Flamsteed constellation 27- 29 I3 --- FNum ?Flamsteed number in constellation 31- 34 I4 --- CA [1/1942]? Lacaille number from Coelum Australe 36- 37 I2 hrs ZRa [0/23]? Piazzi right ascension wedge 38 A1 --- Dot [.]? Delimiter 39- 41 I3 --- ZNo ?Piazzi number within right ascension wedge -------------------------------------------------------------------------------- Note (1): This is the sequential star number from Baily's edition of Ulugh Beg's catalogue, adopted by Knobel except in Piscis Austrinus. The numbering follows Knobel in PsA. This number and the Ulugh Beg designation (UCon-UInf-UNum) are absent on continuation records, which contain additional or alternative identifications for the star. Note (2): A '*' here indicates that this catalog entry has no identification; a '?' indicates that the identification is flagged as uncertain; a '+' indicates that the identification has been corrected from an obvious error in the catalog or inferred from catalog notes. -------------------------------------------------------------------------------- History: * 2021-07-26: first release. ================================================================================