/usr/include/astrometry/tycho2.h is in libastrometry-dev 0.70+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# This file is part of the Astrometry.net suite.
# Licensed under a 3-clause BSD style license - see LICENSE
*/
/*
Parses Tycho-2 data files, which are available here:
http://www.astro.ku.dk/~cf/CD/data/
*/
#ifndef TYCHO2_H
#define TYCHO2_H
#include <stdint.h>
#include "astrometry/starutil.h"
// 206 bytes of data, but each record is supposed to be terminated
// by \r\n, making...
#define TYCHO_RECORD_SIZE_RAW 206
// ... 208 bytes total!
#define TYCHO_RECORD_SIZE 208
#define TYCHO_SUPPLEMENT_RECORD_SIZE_RAW 122
#define TYCHO_SUPPLEMENT_RECORD_SIZE 124
struct tycho2_entry {
// together these form the star ID.
int16_t tyc1; // [1, 9537] in main catalog; [2, 9529] in suppl.
int16_t tyc2; // [1, 12121] main; [1,12112] suppl.
uint8_t tyc3; // [1, 3] main, [1, 4] suppl.
// flag "P": photo-center of two stars was used for position
anbool photo_center;
// flag "X": no mean position, no proper motion
anbool no_motion;
// flag "T"
anbool tycho1_star;
// flag "D"
anbool double_star;
// flag "P" ( DP)
anbool photo_center_treatment;
// flag "H" (in supplements)
anbool hipparcos_star;
// [degrees]
double ra; // RAdeg
double dec; // DEdeg
double mean_ra; // mRAdeg
double mean_dec; // mDEdeg
// [degrees]
float sigma_ra; // mas2deg(e_RA*)
float sigma_dec; // mas2deg(e_DE)
float sigma_mean_ra; // mas2deg(e_mRA*)
float sigma_mean_dec; // mas2deg(e_mDE)
// [arcsec/yr]
float pm_ra; // pmRA* / 1000
// (note that this is actually a change in RA*cos(Dec))
float pm_dec; // pmDE / 1000
// [arcsec/yr]
float sigma_pm_ra; // e_pmRA* / 1000
float sigma_pm_dec; // e_pmDE / 1000
// [yr]
float epoch_ra; // epRA + 1990
float epoch_dec; // epDE + 1990
float epoch_mean_ra; // mepRA
float epoch_mean_dec; // mepDE
//
uint8_t nobs; // Num
// "goodness"
float goodness_mean_ra; // g_mRA
float goodness_mean_dec; // g_mDEC
float goodness_pm_ra; // g_pmRA
float goodness_pm_dec; // g_pmDEC
// [mag] (0.0 means unavailable)
float mag_BT; // BT
float mag_VT; // VT
float sigma_BT; // e_BT
float sigma_VT; // e_VT
// [mag] supplements only: Hp magnitude
float mag_HP; // HP
float sigma_HP; // e_HP
// [degrees], -1.0 for null.
float prox;
float correlation;
int32_t hipparcos_id; // [1, 120404] (or zero for null)
char hip_ccdm[4]; // (up to three chars; null-terminated.)
};
typedef struct tycho2_entry tycho2_entry;
int tycho2_guess_is_supplement(const char* line);
int tycho2_parse_entry(const char* line, tycho2_entry* entry);
int tycho2_supplement_parse_entry(const char* line, tycho2_entry* entry);
#endif
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