This file contains information on the guide stars used by ISO.
The APHSTAR file contains a primary header with the fields described in Table D.4. In this example non-mandatory fields are filled with example values.
| Keyword | Value | Description |
| SIMPLE = | T | / File does conform to FITS standard |
| BITPIX = | 8 | / Number of bits per data pixel |
| NAXIS = | 0 | / Number of data axes |
| EXTEND = | T | / FITS dataset may contain extensions |
| COMMENT | FITS (Flexible Image Transport System) format defined in | |
| COMMENT | Astronomy and Astrophysics Supplement Series v44/p363, | |
| COMMENT | v44/p371, v73/p359, v73/p365. | |
| COMMENT | Contact the NASA Science Office of Standards and Technology | |
| COMMENT | for the FITS Definition document #100 and other FITS | |
| COMMENT | information. | |
| ORIGIN = | 'ESA ' | / Not from central ESA archive |
| TELESCOP = | 'ISO ' | / Infrared Space Observatory |
| COMMENT | ISO operational guide-star list | |
| FILENAME = | 'APHSTAR ' | / File name in archive |
| DATE = | '1999-11-18' | / Date of addition to archive |
| FILEVERS = | '1919 ' | / File version in archive |
| OLPVERS = | 'OLP_80B1' | / SOC OLP system version |
| CALGVERS = | 'CALG_40 ' | / SOC OLP CAL-G files version |
| USERNAME = | 'APOLLOCK' | / Product not catalogued |
| DATE-OLD = | '1999-05-17' | / Date of original creation by IDT |
The APHSTAR file contains records described in Table D.5.
| Keyword | Number | Format | Description |
| REFNUM | 1 | I4 | ISO guide-star catalogue reference number |
| TYC | 2 | I2 | Tycho Catalogue identifier (TYC(3)=1) |
| HIP | 1 | I4 | Hipparcos Catalogue identifier |
| VMAG | 1 | R4 | V magnitude |
| PMOTION | 2 | I4 | Proper motion in (arcsec/yr)*100000 |
| PARALLAX | 1 | I4 | Trigonometric parallax in arcsec*100000 |
| SPARE | 4 | I1 | Spare space |