This is a grab bag of historical information which it
would be good to preserve about any DEIMOS run (in
fact, about any observing run with any instrument,
but DEIMOS is our current target).  Some info is
preserved per exposure, some is logged all night,
some is preserved per night at start time, some might
be preserved per run.

These data come from various sources, but they can all
be accomodated in one schema for later correlation.

Logging:
every N minutes all night

	Dome temp
	Outside temp
	Instrument innards temp(s)
	Wind
	Sky background
	Seeing

Per frame (based partly on NOAO IRAF docs):
Goes into FITS headers/tables that observer
takes home with data

	Date
	Observer
	Instrument
	Telescope
	Detector (*)
	Comments
	Object
	Slitmask barcode
	EXPTIME
	DARKTIME 
	IMAGETYP	(FLAT ZERO DARK FRINGE COMP CALIBS CALIBI)
	UT
	RA
	DEC
	ST
	EPOCH
	ZD
	AIRMASS (can't this be computed from the above?)
	PREFLASH
	GAIN
	DWELL
	CAMTEMP
	DEWTEMP
	BIASSEC
	TRIMSEC
	DATASEC
	CCDSEC
	ORIGSEC
	CCDSUM
	DISPERSE
	TILTPOS
	POSANGLE
	DISPAXIS
	FILTERS
	
Per night (or are some of these per run?):
Logged for both astronomical and engineering purposes

	Zero frames
	Dark frames
	Flat fields
	Calibration (image) frames
	Calibration (spectral) frames
	Which CCDs are in which locations in array
	Snapshot defect list of each CCD
	Fringe frames?
	
Archiving data taken:
	All "long" FITS headers go in database
	All images go to archival storage, either
		exabyte/DLT (yuck) or jukebox
	All headers in DB are marked with a 
		"statute of limitations" date
		determining when public access
		will be permitted by the obs.