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package nom.tam.fits.header;
/*
* #%L
* nom.tam FITS library
* %%
* Copyright (C) 1996 - 2024 nom-tam-fits
* %%
* This is free and unencumbered software released into the public domain.
*
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* distribute this software, either in source code form or as a compiled
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* of this software dedicate any and all copyright interest in the
* software to the public domain. We make this dedication for the benefit
* of the public at large and to the detriment of our heirs and
* successors. We intend this dedication to be an overt act of
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*/
/**
* This data dictionary contains FITS keywords that have been widely used within the astronomical community. It is
* recommended that these keywords only be used as defined here. These are the Keywords that describe the observation.
*
*
*
* @author Richard van Nieuwenhoven
*/
public enum ObservationDescription implements IFitsHeader {
/**
* The value field shall contain a floating point number giving the air mass during the observation by a ground
* based telescope. The value of the airmass is often approximated by the secant of the elevation angle and has a
* value of 1.0 at the zenith and increases towards the horizon. This value is assumed to correspond to the start of
* the observation unless another interpretation is clearly explained in the comment field.
*/
AIRMASS(SOURCE.NOAO, HDU.ANY, VALUE.REAL, "air mass"),
/**
* The value field gives the declination of the observation. It may be expressed either as a floating point number
* in units of decimal degrees, or as a character string in 'dd:mm:ss.sss' format where the decimal point and number
* of fractional digits are optional. The coordinate reference frame is given by the RADECSYS keyword, and the
* coordinate epoch is given by the EQUINOX keyword. Example: -47.25944 or '-47:15:34.00'.
*/
DEC(SOURCE.NOAO, HDU.ANY, VALUE.STRING, "declination of the observed object"),
/**
* The value field shall contain a floating point number giving the nominal declination of the pointing direction in
* units of decimal degrees. The coordinate reference frame is given by the RADECSYS keyword, and the coordinate
* epoch is given by the EQUINOX keyword. The precise definition of this keyword is instrument-specific, but
* typically the nominal direction corresponds to the direction to which the instrument was requested to point. The
* DEC_PNT keyword should be used to give the actual pointed direction.
*/
DEC_NOM(SOURCE.HEASARC, HDU.ANY, VALUE.REAL, "nominal declination of the observation"),
/**
* The value field shall contain a floating point number giving the declination of the observed object in units of
* decimal degrees. The coordinate reference frame is given by the RADECSYS keyword, and the coordinate epoch is
* given by the EQUINOX keyword.
*/
DEC_OBJ(SOURCE.HEASARC, HDU.ANY, VALUE.REAL, "declination of the observed object"),
/**
* The value field shall contain a floating point number giving the declination of the pointing direction in units
* of decimal degrees. The coordinate reference frame is given by the RADECSYS keyword, and the coordinate epoch is
* given by the EQUINOX keyword. The precise definition of this keyword is instrument-specific, but typically the
* pointed direction corresponds to the optical axis of the instrument. This keyword gives a mean value in cases
* where the pointing axis was not fixed during the entire observation.
*/
DEC_PNT(SOURCE.HEASARC, HDU.ANY, VALUE.REAL, "declination of the pointed direction of the instrument"),
/**
* The value field shall contain a floating point number giving the declination of the space craft (or telescope
* platform) X axis during the observation in decimal degrees. The coordinate reference frame is given by the
* RADECSYS keyword, and the coordinate epoch is given by the EQUINOX keyword. This keyword gives a mean value in
* cases where the axis was not fixed during the entire observation.
*/
DEC_SCX(SOURCE.HEASARC, HDU.ANY, VALUE.REAL, "declination of the X spacecraft axis"),
/**
* The value field shall contain a floating point number giving the declination of the space craft (or telescope
* platform) Z axis during the observation in decimal degrees. The coordinate reference frame is given by the
* RADECSYS keyword, and the coordinate epoch is given by the EQUINOX keyword. This keyword gives a mean value in
* cases where the axis was not fixed during the entire observation.
*/
DEC_SCZ(SOURCE.HEASARC, HDU.ANY, VALUE.REAL, "declination of the Z spacecraft axis"),
/**
* The value field shall contain a floating point number giving the geographic latitude from which the observation
* was made in units of degrees.
*/
LATITUDE(SOURCE.UCOLICK, HDU.ANY, VALUE.REAL, "geographic latitude of the observation"),
/**
* The value field shall contain a floating point number giving the angle between the direction of the observation
* (e.g., the optical axis of the telescope or the position of the target) and the moon, measured in degrees.
*/
MOONANGL(SOURCE.STScI, HDU.ANY, VALUE.REAL, "angle between the observation and the moon"),
/**
* The value field shall contain a character string giving a name for the observed object that conforms to the IAU
* astronomical object naming conventions. The value of this keyword is more strictly constrained than for the
* standard OBJECT keyword which in practice has often been used to record other ancillary information about the
* observation (e.g. filter, exposure time, weather conditions, etc.).
*/
OBJNAME(SOURCE.NOAO, HDU.ANY, VALUE.STRING, "AU name of observed object"),
/**
* The value field shall contain a character string which uniquely identifies the dataset contained in the FITS
* file. This is typically a sequence number that can contain a mixture of numerical and character values. Example:
* '10315-01-01-30A'
*/
OBS_ID(SOURCE.HEASARC, HDU.ANY, VALUE.STRING, "unique observation ID"),
/**
* The value field shall contain a floating point number giving the position angle of the y axis of the detector
* projected on the sky, in degrees east of north. This keyword is synonymous with the CROTA2 WCS keyword.
*/
ORIENTAT(SOURCE.STScI, HDU.IMAGE, VALUE.REAL, "position angle of image y axis (deg. E of N)"),
/**
* The value field shall contain a floating point number giving the position angle of the relevant aspect of
* telescope pointing axis and/or instrument on the sky in units of degrees east of north. It commonly applies to
* the orientation of a slit mask.
*/
PA_PNT(SOURCE.UCOLICK, HDU.ANY, VALUE.REAL, "position angle of the pointing"),
/**
* The value field gives the Right Ascension of the observation. It may be expressed either as a floating point
* number in units of decimal degrees, or as a character string in 'HH:MM:SS.sss' format where the decimal point and
* number of fractional digits are optional. The coordinate reference frame is given by the RADECSYS keyword, and
* the coordinate epoch is given by the EQUINOX keyword. Example: 180.6904 or '12:02:45.7'.
*/
RA(SOURCE.NOAO, HDU.ANY, VALUE.STRING, "R.A. of the observation"),
/**
* The value field shall contain a floating point number giving the nominal Right Ascension of the pointing
* direction in units of decimal degrees. The coordinate reference frame is given by the RADECSYS keyword, and the
* coordinate epoch is given by the EQUINOX keyword. The precise definition of this keyword is instrument-specific,
* but typically the nominal direction corresponds to the direction to which the instrument was requested to point.
* The RA_PNT keyword should be used to give the actual pointed direction.
*/
RA_NOM(SOURCE.HEASARC, HDU.ANY, VALUE.REAL, "nominal R.A. of the observation"),
/**
* The value field shall contain a floating point number giving the Right Ascension of the observed object in units
* of decimal degrees. The coordinate reference frame is given by the RADECSYS keyword, and the coordinate epoch is
* given by the EQUINOX keyword.
*/
RA_OBJ(SOURCE.HEASARC, HDU.ANY, VALUE.REAL, "R.A. of the observed object"),
/**
* The value field shall contain a floating point number giving the Right Ascension of the pointing direction in
* units of decimal degrees. The coordinate reference frame is given by the RADECSYS keyword, and the coordinate
* epoch is given by the EQUINOX keyword. The precise definition of this keyword is instrument-specific, but
* typically the pointed direction corresponds to the optical axis of the instrument. This keyword gives a mean
* value in cases where the pointing axis was not fixed during the entire observation.
*/
RA_PNT(SOURCE.HEASARC, HDU.ANY, VALUE.REAL, "R.A. of the pointed direction of the instrument"),
/**
* The value field shall contain a floating point number giving the Right Ascension of the space craft (or telescope
* platform) X axis during the observation in decimal degrees. The coordinate reference frame is given by the
* RADECSYS keyword, and the coordinate epoch is given by the EQUINOX keyword. This keyword gives a mean value in
* cases where the axis was not fixed during the entire observation.
*/
RA_SCX(SOURCE.HEASARC, HDU.ANY, VALUE.REAL, "R.A. of the X spacecraft axis"),
/**
* The value field shall contain a floating point number giving the Right Ascension of the space craft (or telescope
* platform) Y axis during the observation in decimal degrees. The coordinate reference frame is given by the
* RADECSYS keyword, and the coordinate epoch is given by the EQUINOX keyword. This keyword gives a mean value in
* cases where the axis was not fixed during the entire observation.
*/
RA_SCY(SOURCE.HEASARC, HDU.ANY, VALUE.REAL, "R.A. of the Y spacecraft axis"),
/**
* The value field shall contain a floating point number giving the Right Ascension of the space craft (or telescope
* platform) Z axis during the observation in decimal degrees. The coordinate reference frame is given by the
* RADECSYS keyword, and the coordinate epoch is given by the EQUINOX keyword. This keyword gives a mean value in
* cases where the axis was not fixed during the entire observation.
*/
RA_SCZ(SOURCE.HEASARC, HDU.ANY, VALUE.REAL, "R.A. of the Z spacecraft axis"),
/**
* The value field shall contain a floating point number giving the angle between the direction of the observation
* (e.g., the optical axis of the telescope or the position of the target) and the sun, measured in degrees.
*/
SUNANGLE(SOURCE.STScI, HDU.ANY, VALUE.REAL, "angle between the observation and the sun");
private final FitsKey key;
ObservationDescription(IFitsHeader.SOURCE status, HDU hdu, VALUE valueType, String comment) {
key = new FitsKey(name(), status, hdu, valueType, comment);
}
@Override
public final FitsKey impl() {
return key;
}
}
