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KI V² Data Products

Calibrated V² Output Description

Calibrated narrow-band V² data files are text files that areproduced by the ISC V² calibration applicationnbCalib. Thefollowing gives an example of the output of nbCalib in default mode:

# Calibrating star HDC195987  at 20 32 51.642 +41 53 54.522 
#  with respect to 4 calibrators: 
#  star HDC195194  at 20 28 25.791 +39 19 44.250   size 0.67  error 0.1  2.7 degrees away from target
#  star HDC200031  at 20 59 42.912 +38 49 22.504   size 0.6  error 0.1    6 degrees away from target
#  star HDC177196  at 19 01 26.368 +46 56 05.325   size 0.7  error 0.06   17 degrees away from target
#  star HDC185395  at 19 36 26.538 +50 13 15.970   size 0.84  error 0.04   13 degrees away from target
# Calibration code settings for this run: 
# > Calibrating all wavebands
# > 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
# 271 data lines read from 100180.spec
# Calibration data format:
# name	#VisPts	MJD	m/d/y/h:m:s	UT	Delay(m)	#Chan	\> WL(um)	CalVis	Err	RawVis	Err	SysVis	Err... \> #Cal	U(m)	V(m)	HA(hr)	BLName
# Target HDC195987:
HDC195987	5	51723.37614../../../100/9:1:38	9.0274	-32.2712	5 2.396	0.717954	0.185974	0.5772	0.147111	0.803951	0.0371808 2.299	0.818887	0.054887	0.5996	0.0299239	0.732213	0.0327609 \> 2.203	1.04916	0.110158	0.7392	0.0530713	0.704562	0.0539792  2.106	0.671904	0.162046	0.4934	0.114967	0.734331	0.0456897  2.009	-0.260067	1.31634	-0.1524	0.77102	0.586004	0.0904048  3	-49.483712	-96.068125	-0.860713	KI_K1K2...

# 9 calibrated scans output under name HDC195987
# 9 total calibrated scans output on target HDC195987

The first section of the output 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 designation header, and then a sequence of space delimited data lines. The contents 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	NChannels	Number of spectrometer channels (integer)
8 + 7*(i-1)	Wavelength i	Channel i wavelength (microns) (float)
9 + 7*(i-1)	CalVis i	Channel i calibrated visibility (dimensionless) (float)
10 + 7*(i-1)	ErrVis i	Channel i std error in calibrated visibility (dimensionless) (float)
11 + 7*(i-1)	RawVis i	Channel i raw (L-1) visibility (dimensionless) (float)
12 + 7*(i-1)	ErrRawVis i	Channel i std error in raw visibility (dimensionless) (float)
13 + 7*(i-1)	SysVis i	Channel i estimated system visibility (dimensionless)
14 + 7*(i-1)	ErrSysVis i	Channel i std error in system visibility (dimensionless) (float)
15 + 7*NChannels	# Cals	Number of calibrators used in calibrating this scan (integer)
16 + 7*NChannels	uCoord	u * lambda -- RA baseline projection (m) (float)
17 + 7*NChannels	vCoord	v * lambda -- Dec baseline projection (m) (float)
18 + 7*NChannels	HRangle	Hour angle on target for this scan (decimal hours) (float)
19 + 7*NChannels	Baseline	Baseline designation for this scan (e.g. KI_K1K2) (string)

where the channel index i runs from 1 to NChannels.

More detailed information is available in the documentation for nbCalib.

Calibrated V2 Output Description

Calibrated V² Output Description