MSC -- KI V^2 Data Products

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KI V² Data Products

Calibrated V² Output Description

Calibrated wide-band V² data files are text files that areproduced by the ISC V² calibration applicationwbCalib. The following gives an example of the output of wbCalib in default mode:

# option Kband
# 1 command line arguments processed
# >> Calibrating star HDC102713  at 11 49 41.715 +34 55 54.329 
# >> with respect to 1 calibrators: 
# >>  star HDC101501  at 11 41 03.017 +34 12 05.888   size 0.9  error 0.06  1.9 degrees away from target
# Wideband calibration code settings for this run: 
# > Calibrating only K-band (rejecting others at read)
# > Calibrating all frame rates
# > Calibrating incoherent spectrometer V2 data
# > Applying jitter correction
# > Using calibration scans within +/- 1 hr of the target scan
# > Weighting calibration scans WRT temporal proximity, variance doubles in 1 hr
# > Weighting calibration scans WRT sky proximity, variance doubles in 15 deg
# > No minimum calibrated scan uncertainty
# > Flagging calibration warnings when multiple calibrators disagree by more than 2 sigma
# > Rejecting the scan when multiple calibrators disagree by more than 3 sigma
# 246 data lines read from /home/bode/pti/data/100/100074.sum
# 295 data lines read from /home/bode/pti/data/100/100075.sum
# 356 data lines read from /home/bode/pti/data/100/100076.sum...
# Calibration data format:
# name	#VisPts	MJD	m/d/y/h:m:s		UT	Delay(m)	WL(um) \> CalVis	Err RawVis	Err	SysVis	Err	#Cal	\> U(m)	V(m)	HA(hr)	FrameRate	BLName
# Target HDC102713:
HDC102713 5 51618.30862../../../100/7:24:24 7.40684 -18.4294 2.2078 \> 0.628617 0.0181397 0.550502 0.0105877 0.875735 0.0188394 1 \> -46.877792 -99.115972 -0.66552 50 PTI_NS
HDC102713 5 51618.32589../../../100/7:49:16 7.82132 -14.5302 2.2072 \> 0.533166 0.0158086 0.46699 0.00989155 0.87588 0.0181731 1 \> -40.930193 -101.853953 -0.249901 50 PTI_NS
HDC102713 5 51618.35305../../../100/8:28:23 8.47326 -9.49788 2.2044 \> 0.435681 0.0118706 0.377309 0.00526829 0.866021 0.0202618 1 \> -30.624757 -105.368530 0.403829 50 PTI_NS
# 161 calibrated scans output under name HDC102713
# 161 total calibrated scans output on target HDC102713

The first section of the file is an extended preamble (with commentlines indicated by # symbols) containing the following pieces:

Indications of any option flags that were passed to wbCalib
What sources will be calibrated with respect to what calibrators
A summary of how the data is to be calibrated -- a summary of the settings for this run
A summary of where the input data is being found
A template line giving the format of the data to follow

The second section of the file containes a list of calibrated outputdata. For each specified target/pseudonym there is a designationheader, and then a sequence of space delimited data lines. Thecontents of these data lines is described by the following table:

field#	content	comments
1	Target Designation	Target Designation (string)
2	# SUM Records	# of sum records averaged into this target scan (integer)
3	MJD	Modified Julian Date (day) (float)
4	UTC Date/Time	UTC Date/time in ../../../yy/hh:mm:ss format (string)
5	UTC	UTC Time (decimal hours) (float)
6	Delay	Average delay (m) (float)
7	Wavelength	SNR-weighted mean wavelength for scan (microns) (float)
8	CalVis	Calibrated wide-band visibility (dimensionless)
9	ErrVis	Std Error in calibrated visibility (dimensionless)
10	RawVis	Raw (L-1) wide-band visibility (dimensionless)
11	ErrRawVis	Std error in raw wide-band visibility (dimensionless)
12	SysVis	Estimated system visibility (dimensionless)
13	ErrSysVis	Std Error in estimated system visibility (dimensionless)
14	# Cals	Number of calibrators used in calibrating this scan (integer)
15	uCoord	u * lambda -- RA baseline projection (m) (float)
16	vCoord	v * lambda -- Dec baseline projection (m) (float)
17	HRangle	Hour angle on target for this scan (decimal hours) (float)
18	Frame Rate	Frame rate for this scan (Hz) (integer)
19	Baseline	Baseline designation for this scan (e.g. KI_K1K2) (string)

More detailed information is available in the documentation for wbCalib.

Calibrated V2 Output Description

Calibrated V² Output Description