The description of the star conditional catalogue . Bytes Format Units Label Explanations -------------------------------------------------------------------- 1- 2 I2 ---- Conditional number 8-11 I4 ---- ntch1 Three number from Tycho-2 15-18 I4 ---- ntch2 22-22 I ---- ntch3 26-40 alpha Right ascencion (hour,min,sec.decimals ) 26-27 I2 hour h 29-30 I2 min m 32-40 F9.6 sec.d s 44-59 delta Declination (degree, arcmin, arcsec.decimal) 44-46 I3 degree o 48-49 I2 arcmin ' 51-59 F9.6 arcsec.d " 63-66 F4.2 V magnitude