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Table of content (hide) (Spectroscopic FITS headers situation as of 2015-06-27) 1. RBT (PST2) raw spectra (before any reduction):1.1 Made before 2014-04-05DATE - UT file creation after exposure and CCD readout (NTP synced PC clock)
FRAME - UT file creation after exposure and CCD readout (NTP synced PC clock)
JD - UT file creation after exposure and CCD readout - calculated from DATE
JDCENTER - UT weighted exposition center - experimental
1.2 Made after 2014-04-05DATE - UT file creation after exposure and CCD readout (NTP synced PC clock)
DATE-BEG - UT exposure start (NTP synced PC clock)
JD - UT exposure start - calculated from DATE-BEG
JDCENTER - UT weighted exposition center - experimental
2. RBT (PST2) reduced spectra:2.1 Reduced before 2015-06-27Only spectra made before 2014-04-05 should have correct time:
DATE - last modification time (by IRAF)
DATE-OBS - exposure start UT
JD - mid-exposure UT
HJD - mid-exposure UT [this is usable only in RA and DEC are correct]
JDCENTER - UT weighted exposition center - experimental
Spectra made after 2014-04-05 have SHIFTED time after reduction:
DATE - last modification time (by IRAF)
DATE-BEG - exposure start UT
DATE-OBS - exposure start UT + (full exposure time) + (CCD readout time)
JD - mid-exposure UT + (full exposure time) + (CCD readout time)
HJD - mid-exposure UT + (full exposure time) + (CCD readout time) [this is usable only in RA and DEC are correct]
JDCENTER - UT weighted exposition center - experimental
2.2 Reduced after 2015-06-27All spectra should have correct time:
DATE - last modification time (by IRAF)
DATE-BEG - exposure start UT
DATE-OBS - exposure start UT
JD - mid-exposure UT
HJD - mid-exposure UT [this is usable only in RA and DEC are correct]
JDCENTER - UT weighted exposition center - experimental
3. PST (PST1) raw spectra (before any reduction):3.1 Made before 2014-09-26DATE - UT exposure start (NTP synced PC clock)
3.2 Made after 2014-09-26DATE - UT file creation after exposure and CCD readout (NTP synced PC clock)
3.3 Made after 2015-07-02 12:00 UTDATE - UT file creation after exposure and CCD readout (NTP synced PC clock)
DATE-BEG - UT exposure start (NTP synced PC clock)
4. PST (PST1) reduced spectra:4.1 Reduced before 2015-06-27Only spectra made before 2014-09-26 should have correct time:
DATE - last modification time (by IRAF)
DATE-OBS - exposure start UT
JD - mid-exposure UT
HJD - mid-exposure UT
Spectra made after 2014-09-26 have SHIFTED time after reduction:
DATE - last modification time (by IRAF)
DATE-OBS - exposure start UT + (full exposure time) + (CCD readout time)
JD - mid-exposure UT + (full exposure time) + (CCD readout time)
HJD - mid-exposure UT + (full exposure time) + (CCD readout time) [this is usable only in RA and DEC are correct]
4.2 Reduced after 2015-06-27All spectra should have correct time:
DATE - last modification time (by IRAF)
DATE-OBS - exposure start UT
JD - mid-exposure UT
HJD - mid-exposure UT
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