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These have agreeded definitions and interpretions however their
presense is obtional. These are largely common to all observations
and telescopes but not essential. These may be ignored by a
single dish FITS reader.
- OBSERVER
- A string giving the observer's name.
- OBSID
- A string describing the observation.
- PROJID
- A string describing the project.
- SCAN
- A scan ID number. Typically this is an identification number
given to a chunk of data when the data is taken. Not all telescopes
provide a scan ID number.
- OBSMODE
- The type of data and observing mode (8 characters
total). The type (LINE, CONT, PULS, etc) + the
mode (PSSW, FQSW, BMSQ, PLSQ, LDSW, TLPW, etc).
These rules do NOT define these observing modes. Writers are strongly
encouraged to use the FITS comments to document these modes.
- MOLECULE
- A string used as a line identifier (with TRANSITI).
- TRANSITI
- A string used as a line identifier (with MOLECULE.)
- TEMPSCAL
- A string describing the scaling applied to reach
the output intensity scale (``TB'',``TA'',``TA*'',``TR'',``TR*'').
- FRONTEND
- A string giving the name of the front end device.
- BACKEND
- A string giving the name of the back end device.
- TCAL
- The calibration temp (K).
- THOT
- The hot load temp (K).
- TCOLD
- The cold load temp (K).
- TRX
- The receiver temp (K).
- FREQRES
- The frequency resolution in Hz. This may differ
from the channel spacing.
- TIMESYS
- The time system which applies to all time columns
and keywords (see the y2k FITS DATE agreement).
- VELDEF
- The velocity definition and frame (8 characters).
The first 4 characters describe the velicity definition. Possible
definitions include:
- RADI
- radio
- OPTI
- optical
- RELA
- relativistic
The second 4 characters describe the reference frame (e.g. ``-LSR'',
``-HEL'', ``-OBS''). If the frequency-like axis gives a frame,
then the frame in VELDEF only applies to any velocities given
as columns or keywords (virtual columns).
- VFRAME
- The radial velocity of the reference frame wrt the
observer.
Vframe - Vtelescope.
- RVSYS
- The radial velocity,
Vsource - Vtelescope.
- OBSFREQ
- The observed frequency (Hz) at the reference pixel
of the frequency-like axis.
- IMAGFREQ
- The image sideband freq (Hz) corresp. to OBSFREQ.
- LST
- The LST (seconds) at the start of scan.
- AZIMUTH
- The azimuth at TIME (deg) (if the TIME axis is
non-degenerate, then this is the azimuth at the TIME
of the first pixel on the TIME axis.
- ELEVATIO
- The elevation at TIME (deg) (same caveat as for AZIMUTH)
- TAU
- The opacity at OBSFREQ.
- TAUIMAGE
- The opacity at IMAGFREQ.
- TAUZENIT
- The opacity per unit air mass.
- HUMIDITY
- The relative humidity (fraction, 0..1).
- TAMBIENT
- The ambient temp (K).
- PRESSURE
- The atmospheric pressure (mm Hg).
- DEWPOINT
- The dew point (K).
- WINDSPEE
- The wind speed (m/s).
- WINDDIRE
- The wind direction (deg. west of north).
- BEAMEFF
- The main-beam efficiency.
- APEREFF
- The antenna aperture efficiency.
- ETAL
- The rear spillover and scattering efficiency.
- ETAFSS
- The forward spillover and scattering efficiency.
- ANTGAIN
- K per Jy.
- BMAJ
- The major main-beam FWHM (deg).
- BMIN
- The minor main-beam FWHM (deg).
- BPA
- The beam position angle (degrees east of north).
- SITELONG
- The site longitude (deg).
- SITELAT
- The site latitude (deg).
- SITEELEV
- The site elevation (m).
- RESTFREQ
- The rest frequency (Hz).
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2004-08-28
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