File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file piazzi.dat 142 7646 Piazzi star catalog ident.dat 97 7732 Cross-identifications of Piazzi's stars notes.dat Issues in source catalog -------------------------------------------------------------------------------- Byte-by-byte Description of files: piazzi.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 2 I2 --- ZHr [0/23] Hour part of the star identifier 3 A1 --- Dot [.] Dot delimiter 4- 6 I3 --- ZNum Star number within the hour 7 A1 --- Note [*]? Flag 8- 10 A3 --- Con ?Constellation abbreviation 12- 14 A3 --- BLet ?Bayer letter within constellation 16 A1 --- BInd ?Bayer index 18- 20 I3 --- FNum ?Flamsteed number within constellation 22- 23 I2 --- HNum ?Hevelius number within constellation 25- 28 I4 --- LNum ?Lacaille CA number 30- 32 I3 --- ZoNum ?Zodiacal star number 34- 36 I3 --- MNum ?Mayer number 38- 39 I2 --- Mag [1/12]?Magnitude or lower magnitude value 40 A1 --- Delim [~]? Delimiter for magnitude range 41- 42 A2 --- Mag_ ?Upper magnitude value (1) 44- 45 I2 h RAh Right Ascension 1800 to the minute (hours) 47- 48 I2 min RAmin Right Ascension 1800 to the minute (minutes) 50- 52 I3 deg RAd Right Ascension 1800 (degrees) 54- 55 I2 arcmin RAm Right Ascension 1800 (minutes) 57- 60 F4.1 arcsec RAs Right Ascension 1800 (seconds) 62- 68 F7.2 arcsec RApre Yearly precession in RA 70- 75 F6.3 arcsec pmRA ?Yearly proper motion in RA 77- 82 A6 --- pmRA_t ?Source of pmRA 84- 86 I3 --- RA_ob ?Number of observations of RA 88- 89 I2 deg DEd Degrees DE, 1800 91- 92 I2 arcmin DEm Minutes DE, 1800 94- 97 F4.1 arcmin DEs Seconds DE, 1800 99 A1 --- DEsgn [+-] Sign DE 101-106 F6.2 arcsec DEpre Yearly precession in DE 108-113 F6.3 arcsec pmDE ?Yearly proper motion in DE 115-120 A6 --- pmDE_t ?Source of pmDE 122-124 I3 --- DE_ob Number of observations of DE 125 A1 --- Upper [^]? Flag for uppercase name (2) 126-134 A9 --- name ?Star name or other qualifier -------------------------------------------------------------------------------- Note (1): this field is left-justified so that a magnitude range looks better to human eyes, as in 4~5 or 9~10. It would qualify for type I2 if it were right-justified. Note (2): a '^' here indicates that the star name or some part of the star designations is written in capital letters, the meaning of which is explained in the catalog's introduction. Byte-by-byte Description of file: ident.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 2 I2 --- ZHr [0/23]? Hour part of the star identifier (1) 3 A1 --- Dot [.]? Delimiter (1) 4- 6 I3 --- ZNum ?Star number within the hour (1) 7 A1 --- NoId [*]? Star if unidentified entry 8- 14 F7.2 arcmin dRA ?Difference in right ascension.cos(DE) (2) 16- 22 F7.2 arcmin dDE ?Difference in declination (2) 24- 29 F6.2 arcmin dist ?Distance from associated object (2) 31- 33 A3 --- BCon ?Bayer constellation 35- 37 A3 --- BLet ?Bayer letter 39 A1 --- BInd ?Bayer index 41- 43 A3 --- FCon ?Flamsteed constellation 45- 47 I3 --- FNum [1-141]? Flamsteed number 49- 52 I4 --- HR [1-9110]? Bright Star catalog number 54- 59 I6 --- HD [1-359083]? Henry Draper catalog number 61- 66 I6 --- HIP [1-120416]? Hipparcos catalog number 68- 71 A4 --- Com ?Component letter(s) (3) 73-102 A30 --- Name ?Object name(s) (4) -------------------------------------------------------------------------------- Note (1): the identifier is missing on lines containing additional matches for the current star. Note (2): difference (HIP - Piazzi), or (SAO - Piazzi) if there is no HIP match for this identification. Note (3): component letter(s) from the Hipparcos or CCDM catalog. Note (4): including the SAO number when the star doesn't have a match in the Hipparcos catalog, in which case the position differences correspond to the SAO position and proper motion. -------------------------------------------------------------------------------- History: * 2019-11-18: initial release. * 2020-02-10: [piazzi.dat] letter omi instead of o for 3.112, which is erroneous but accords with Flamsteed's catalog and was more likely what Piazzi intended. * 2020-02-21: [piazzi.dat] fix constellation typo for 5.103. * 2020-02-24: [ReadMe] fix unit errors in field descriptions. * 2020-02-27: [piazzi.dat] Flamsteed letter o instead of omi for 8.122. * 2020-03-05: [piazzi.dat] letter o instead of omi for 11.189. * 2020-03-17: [piazzi.dat] fixed several errors: - Bayer index 2 instead of Fl. number for 14.159, - constellation Aqr instead of Vul for 20.380, - Fl. number 1 instead of Bayer index for 21.100, - Fl. number 2 instead of Bayer index for 21.160, - Bayer index 2 instead of Fl. number for 22.152, - Fl. number 1 instead of Bayer letter iot for 22.249. * 2020-03-22: [piazzi.dat] fixed more errors: - Fl. number 1 instead of Bayer index for 4.187, - Fl. number 2 instead of Bayer index for 4.203. * 2020-03-24: [piazzi.dat] - constellation Scl instead of Sco for 23.148, - Fl. letter o instead of omi for 18.149. ================================================================================