No Shift, 180 Degree <b style="color:black;background-color:#ffff66">Rotation</b>

1: Introduction
2: Iteration I
3: Iteration II
4: Summary

1: Introduction

In this series of tests, we tested the performance of WFC3/UVIS instrument distortion coefficient table (IDCTAB) uab1537bi_idc.fits. This IDCTAB contains uniquely computed distortion solutions for 10 filters: F225W, F275W, F336W, F390W, F43W, F555W, F606W, F775W, F814W, and F850LP. All other filters use the values for F606W.

This series of tests is designed to test how the IDCTAB deals with a large (180°) rotation. To that end, two sets of observations were required for this test. The first set was taken in mid-july 2009, and the second set was taken in mid-January 2010 and is rotated by 180° from the first set.

Unfortunately, observations of only 6 of the 10 filters with unique IDCTAB solutions were obtained. Observations were available for filters F225W, F275W, F336W, F438W, F606W, and F814W. Observations were unavailable for filters F390W, F555W, F7775W, and F850LP. Additional details of the observations used for this test can be found in the summary table below.

Summary of Relevant Observation Information
Rootname	Proposal ID	Target Name	Filter	Exposure Time	Date of Observation	Orientat	X Postarg	Y Postarg	RA Postarg	DEC Postarg
iaby02x5q	11452	OMEGACEN	F225W	350.000000	2009-07-15	-28.40584775040186	0.000000	0.000000	2.016968333333E+02	-4.747956944444E+01
ibc301r3q	11911	OMEGACEN	F225W	900.000000	2010-01-14	149.7683471644897	0.000000	0.000000	2.016928333333E+02	-4.747905555556E+01
iaby02x0q	11452	OMEGACEN	F275W	350.000000	2009-07-15	-28.40584775040186	0.000000	0.000000	2.016968333333E+02	-4.747956944444E+01
ibc301qtq	11911	OMEGACEN	F275W	800.000000	2010-01-14	149.7683471644897	0.000000	0.000000	2.016928333333E+02	-4.747905555556E+01
iaby02x4q	11452	OMEGACEN	F336W	350.000000	2009-07-15	-28.40584775040186	0.000000	0.000000	2.016968333333E+02	-4.747956944444E+01
ibc301r5s	11911	OMEGACEN	F336W	350.000000	2010-01-14	149.7683471644897	0.000000	0.000000	2.016928333333E+02	-4.747905555556E+01
iaby02wzq	11452	OMEGACEN	F438W	35.000000	2009-07-15	-28.40584775040186	0.000000	0.000000	2.016968333333E+02	-4.747956944444E+01
ibc301qxq	11911	OMEGACEN	F438W	350.000000	2010-01-14	149.7683471644897	0.000000	0.000000	2.016928333333E+02	-4.747905555556E+01
iaby02x7q	11452	OMEGACEN	F606W	35.000000	2009-07-15	-28.40584775040186	0.000000	0.000000	2.016968333333E+02	-4.747956944444E+01
ibc301qrq	11911	OMEGACEN	F606W	40.000000	2010-01-14	149.7683471644897	0.000000	0.000000	2.016928333333E+02	-4.747905555556E+01
iaby02x2q	11452	OMEGACEN	F814W	35.000000	2009-07-15	-28.40584775040186	0.000000	0.000000	2.016968333333E+02	-4.747956944444E+01
ibc301qzq	11911	OMEGACEN	F814W	40.000000	2010-01-14	149.7683471644897	0.000000	0.000000	2.016928333333E+02	-4.747905555556E+01

2: Iteration I

Iteration 1 Statistics Computed From Binned Vector Plots
Filter	X RMS	Y RMS	Vec Mag RMS	Vec Mag Mean	Vec Mag Median	Vec Mag Max	Vec Mag Min
F225W	0.0273771	0.0464570	0.0259423	73.6910	73.6885	73.7656	73.6290
F275W	0.0214518	0.0164090	0.0219909	73.3759	73.3756	73.4472	73.3180
F336W	0.0192472	0.0236598	0.0188642	73.4310	73.4309	73.4816	73.3862
F438W	0.0260414	0.0192975	0.0235492	72.1972	72.1935	72.2718	72.1456
F606W	0.0228731	0.0226034	0.0230881	73.0718	73.0683	73.1339	73.0144
F814W	0.0184914	0.0234663	0.0192754	72.1775	72.1787	72.2330	72.1179

F225W

F275W

F336W

F438W

F606W

F814W

Shift.dat parameters by Filter
Filter	X Shift	Y Shift	Rotation	Scale
F225W	62.94205	38.32008	-0.000429999999994	0.999988
F275W	62.95741	37.68903	0.00022	0.9999965
F336W	63.59559	36.71012	-0.000310000000013	0.9999953
F438W	62.4213	36.27583	-2.99999999811e-05	0.9999984
F606W	62.73308	37.4697	-0.000209999999981	1.0
F814W	62.32654	36.39898	-2.99999999811e-05	0.9999982

NOTE: In the above table, shift values are in units of drizzled image pixels, rotation values are in units of degrees, and scale values are dimensionless multipliers.

3: Iteration II

Iteration II Statistics Computed From Binned Vector Plots
Filter	X RMS	Y RMS	Vec Mag RMS	Vec Mag Mean	Vec Mag Median	Vec Mag Max	Vec Mag Min
F225W	0.0336515	0.0331442	0.0203942	0.0427191	0.0400018	0.160794	0.00249708
F275W	0.0191096	0.0171655	0.0123848	0.0226815	0.0198300	0.0587857	0.00205341
F336W	0.0214420	0.0185267	0.0134341	0.0250760	0.0234981	0.0866359	0.00100080
F438W	0.0253918	0.0193347	0.0151199	0.0283531	0.0268018	0.0928217	0.00325246
F606W	0.0245699	0.0206247	0.0158022	0.0279968	0.0268345	0.120874	0.000937763
F814W	0.0184651	0.0236663	0.0154733	0.0259433	0.0235946	0.0751794	0.00179471