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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 01/01/2000/9:1:38 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:

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 dd/mm/yyyy/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