          Andrew Dolphin
          National Optical Astronomy Observatories
          950 N. Cherry Avenue
          PO Box 26732
          Tucson, AZ 85726

     Phone: (520)318-8503
     Fax: (520)318-8360
     E-mail:dolphin@noao.edu

The information on this page is an update of that presented in Dolphin (2000). The necessitation of the update is for a few reasons:

More recent observations of Omega Cen (through August 2002)
Improved versions of HSTphot to reduce the data
Improved functional forms for the fitting

The limitation of the new calibration equations is that the only consider cold (after April 1994) observations.

Contribution for 2002 HST Calibration Workshop proceedings available here.

Equations last updated September 17, 2002.

Previous equations:

May 31 2002

CTE Correction

The recommended CTE correction below is more complex than usual CTE equations, to allow for the fact that the star brightness is not constant as it is read out, and therefore that the CTE loss per pixel changes during readout. The recipe for correction is as follows:

First, calculate the following variable values:

lct0 = ln(counts/electrons) - 7
bg = sqrt ( background/electrons^2 + 1 ) - 10
lbg = ln(sqrt ( background/electrons^2 + 1 )) - 1
yr = (MJD - 50193) / 365.25

Second, correct for the CTE loss in X readout:

XCTE (mags) = 0.0194*exp(-0.00085*bg)*x/800

Third, recalculate lct using:

lct = lct0 + 0.921*XCTE

Finally, correct for the CTE loss in Y readout:

c1 = 0.0143*(0.729*exp(-0.397*lbg)+0.271*exp(-0.0144*bg))*(1.+0.267*yr-0.0004*yr*yr)*y/800
c2 = 2.99*exp(-0.479*lct)
YCTE (mags) = ln(exp(c1)*(1+c2)-c2)/0.441

Uncertainties of the parameters:

0.0194 +/- 0.0013
0.00085 +/- 0.00054
0.0143 +/- 0.0014
0.729,0.271 +/- 0.030
0.397 +/- 0.015
0.0144 +/- 0.0026
0.268 +/- 0.006
0.0004 +/- 0.0010
2.99 +/- 0.35
0.479 +/- 0.018
0.441 +/- 0.016

Zero Points relative to Holtzman et al. (1995)

GAIN=7 GAIN=14

Filter PC1 WFC2 WFC3 WFC4 PC1 WFC2 WFC3 WFC4

F439W 0.016 +/- 0.015 0.036 +/- 0.004 0.056 +/- 0.005 0.063 +/- 0.003 0.013 +/- 0.003 0.046 +/- 0.002 0.048 +/- 0.002 0.051 +/- 0.002

F555W -0.012 +/- 0.004 0.024 +/- 0.001 0.041 +/- 0.002 0.025 +/- 0.001 0.008 +/- 0.003 0.026 +/- 0.001 0.040 +/- 0.001 0.037 +/- 0.001

F675W 0.021 +/- 0.006 0.035 +/- 0.004 0.033 +/- 0.003 0.029 +/- 0.004 -0.003 +/- 0.003 0.041 +/- 0.001 0.045 +/- 0.002 0.023 +/- 0.002

F814W -0.024 +/- 0.003 0.012 +/- 0.001 0.021 +/- 0.004 0.009 +/- 0.001 0.007 +/- 0.002 0.016 +/- 0.001 0.016 +/- 0.001 0.010 +/- 0.001

note: add these values to Holtzman-calibrated magnitudes

	GAIN=7	GAIN=14
Filter	PC1	WFC2	WFC3	WFC4	PC1	WFC2	WFC3	WFC4
F439W	0.016 +/- 0.015	0.036 +/- 0.004	0.056 +/- 0.005	0.063 +/- 0.003	0.013 +/- 0.003	0.046 +/- 0.002	0.048 +/- 0.002	0.051 +/- 0.002
F555W	-0.012 +/- 0.004	0.024 +/- 0.001	0.041 +/- 0.002	0.025 +/- 0.001	0.008 +/- 0.003	0.026 +/- 0.001	0.040 +/- 0.001	0.037 +/- 0.001
F675W	0.021 +/- 0.006	0.035 +/- 0.004	0.033 +/- 0.003	0.029 +/- 0.004	-0.003 +/- 0.003	0.041 +/- 0.001	0.045 +/- 0.002	0.023 +/- 0.002
F814W	-0.024 +/- 0.003	0.012 +/- 0.001	0.021 +/- 0.004	0.009 +/- 0.001	0.007 +/- 0.002	0.016 +/- 0.001	0.016 +/- 0.001	0.010 +/- 0.001

Additional Offsets for Non-Standard Filters

Filter Std Filt offset

F300W F336W -0.000 +/- 0.000

F380W F439W 0.079 +/- 0.004

F410M F439W 0.064 +/- 0.004

F450W F439W -0.006 +/- 0.004

F467M F439W -0.059 +/- 0.004

F547M F555W -0.008 +/- 0.003

F569W F555W -0.023 +/- 0.003

F606W F555W -0.023 +/- 0.002

F622W F675W 0.001 +/- 0.006

F702W F675W 0.001 +/- 0.002

F785LP F814W 0.002 +/- 0.004

F791W F814W -0.028 +/- 0.005

F850LP F814W 0.002 +/- 0.005

F1042M F814W -0.000 +/- 0.000

note: add these values plus the corresponding calibration from the standard filter table to Holtzman-calibrated magnitudes

Filter	Std Filt	offset
F300W	F336W	-0.000 +/- 0.000
F380W	F439W	0.079 +/- 0.004
F410M	F439W	0.064 +/- 0.004
F450W	F439W	-0.006 +/- 0.004
F467M	F439W	-0.059 +/- 0.004
F547M	F555W	-0.008 +/- 0.003
F569W	F555W	-0.023 +/- 0.003
F606W	F555W	-0.023 +/- 0.002
F622W	F675W	0.001 +/- 0.006
F702W	F675W	0.001 +/- 0.002
F785LP	F814W	0.002 +/- 0.004
F791W	F814W	-0.028 +/- 0.005
F850LP	F814W	0.002 +/- 0.005
F1042M	F814W	-0.000 +/- 0.000

WFPC2 Instrumental Magnitudes

GAIN=7 Zero Points for 1 DN/sec

Filter PC1 WFC2 WFC3 WFC4
F380W 20.952 +/- 0.016 20.982 +/- 0.005 21.009 +/- 0.006 20.987 +/- 0.005

F410M 19.324 +/- 0.016 19.354 +/- 0.006 19.380 +/- 0.006 19.358 +/- 0.005

F439W 20.825 +/- 0.015 20.855 +/- 0.004 20.882 +/- 0.005 20.859 +/- 0.003

F450W 21.921 +/- 0.016 21.951 +/- 0.006 21.978 +/- 0.006 21.956 +/- 0.006

F467M 19.856 +/- 0.016 19.886 +/- 0.006 19.913 +/- 0.006 19.890 +/- 0.005

F547M 21.557 +/- 0.005 21.604 +/- 0.003 21.628 +/- 0.004 21.582 +/- 0.003

F555W 22.451 +/- 0.004 22.498 +/- 0.001 22.522 +/- 0.002 22.476 +/- 0.001

F569W 22.122 +/- 0.005 22.169 +/- 0.003 22.193 +/- 0.004 22.148 +/- 0.003

F606W 22.787 +/- 0.004 22.834 +/- 0.002 22.857 +/- 0.003 22.812 +/- 0.002

F622W 22.303 +/- 0.008 22.328 +/- 0.007 22.333 +/- 0.006 22.300 +/- 0.007

F675W 21.994 +/- 0.006 22.018 +/- 0.004 22.023 +/- 0.003 21.990 +/- 0.004

F702W 22.389 +/- 0.006 22.413 +/- 0.005 22.418 +/- 0.004 22.385 +/- 0.005

F785LP 20.593 +/- 0.005 20.639 +/- 0.004 20.656 +/- 0.006 20.614 +/- 0.004

F791W 21.394 +/- 0.006 21.440 +/- 0.005 21.456 +/- 0.006 21.414 +/- 0.005

F814W 21.554 +/- 0.003 21.599 +/- 0.001 21.616 +/- 0.004 21.574 +/- 0.001

F850LP 19.856 +/- 0.006 19.902 +/- 0.005 19.919 +/- 0.006 19.877 +/- 0.005

F1042M 16.082 +/- 0.003 16.127 +/- 0.001 16.144 +/- 0.004 16.102 +/- 0.001

Filter	PC1	WFC2	WFC3	WFC4
F380W	20.952 +/- 0.016	20.982 +/- 0.005	21.009 +/- 0.006	20.987 +/- 0.005
F410M	19.324 +/- 0.016	19.354 +/- 0.006	19.380 +/- 0.006	19.358 +/- 0.005
F439W	20.825 +/- 0.015	20.855 +/- 0.004	20.882 +/- 0.005	20.859 +/- 0.003
F450W	21.921 +/- 0.016	21.951 +/- 0.006	21.978 +/- 0.006	21.956 +/- 0.006
F467M	19.856 +/- 0.016	19.886 +/- 0.006	19.913 +/- 0.006	19.890 +/- 0.005
F547M	21.557 +/- 0.005	21.604 +/- 0.003	21.628 +/- 0.004	21.582 +/- 0.003
F555W	22.451 +/- 0.004	22.498 +/- 0.001	22.522 +/- 0.002	22.476 +/- 0.001
F569W	22.122 +/- 0.005	22.169 +/- 0.003	22.193 +/- 0.004	22.148 +/- 0.003
F606W	22.787 +/- 0.004	22.834 +/- 0.002	22.857 +/- 0.003	22.812 +/- 0.002
F622W	22.303 +/- 0.008	22.328 +/- 0.007	22.333 +/- 0.006	22.300 +/- 0.007
F675W	21.994 +/- 0.006	22.018 +/- 0.004	22.023 +/- 0.003	21.990 +/- 0.004
F702W	22.389 +/- 0.006	22.413 +/- 0.005	22.418 +/- 0.004	22.385 +/- 0.005
F785LP	20.593 +/- 0.005	20.639 +/- 0.004	20.656 +/- 0.006	20.614 +/- 0.004
F791W	21.394 +/- 0.006	21.440 +/- 0.005	21.456 +/- 0.006	21.414 +/- 0.005
F814W	21.554 +/- 0.003	21.599 +/- 0.001	21.616 +/- 0.004	21.574 +/- 0.001
F850LP	19.856 +/- 0.006	19.902 +/- 0.005	19.919 +/- 0.006	19.877 +/- 0.005
F1042M	16.082 +/- 0.003	16.127 +/- 0.001	16.144 +/- 0.004	16.102 +/- 0.001

GAIN=14 Zero Points for 1 DN/sec

Filter PC1 WFC2 WFC3 WFC4
F380W 20.203 +/- 0.005 20.238 +/- 0.004 20.246 +/- 0.004 20.247 +/- 0.004

F410M 18.575 +/- 0.005 18.610 +/- 0.005 18.617 +/- 0.005 18.619 +/- 0.005

F439W 20.076 +/- 0.003 20.111 +/- 0.002 20.118 +/- 0.002 20.120 +/- 0.002

F450W 21.173 +/- 0.005 21.207 +/- 0.005 21.215 +/- 0.005 21.216 +/- 0.005

F467M 19.107 +/- 0.005 19.142 +/- 0.005 19.149 +/- 0.004 19.151 +/- 0.004

F547M 20.832 +/- 0.004 20.852 +/- 0.003 20.871 +/- 0.003 20.867 +/- 0.003

F555W 21.726 +/- 0.003 21.745 +/- 0.001 21.765 +/- 0.001 21.761 +/- 0.001

F569W 21.398 +/- 0.004 21.417 +/- 0.003 21.436 +/- 0.003 21.432 +/- 0.003

F606W 22.062 +/- 0.004 22.081 +/- 0.002 22.101 +/- 0.002 22.096 +/- 0.002

F622W 21.534 +/- 0.006 21.580 +/- 0.006 21.589 +/- 0.006 21.566 +/- 0.006

F675W 21.224 +/- 0.003 21.270 +/- 0.001 21.279 +/- 0.002 21.256 +/- 0.002

F702W 21.619 +/- 0.004 21.665 +/- 0.003 21.674 +/- 0.003 21.651 +/- 0.003

F785LP 19.879 +/- 0.005 19.889 +/- 0.004 19.895 +/- 0.004 19.887 +/- 0.004

F791W 20.679 +/- 0.006 20.690 +/- 0.005 20.695 +/- 0.005 20.688 +/- 0.005

F814W 20.839 +/- 0.002 20.850 +/- 0.001 20.855 +/- 0.001 20.848 +/- 0.001

F850LP 19.141 +/- 0.005 19.152 +/- 0.005 19.158 +/- 0.005 19.150 +/- 0.005

F1042M 15.367 +/- 0.002 15.378 +/- 0.001 15.383 +/- 0.001 15.376 +/- 0.001

Filter	PC1	WFC2	WFC3	WFC4
F380W	20.203 +/- 0.005	20.238 +/- 0.004	20.246 +/- 0.004	20.247 +/- 0.004
F410M	18.575 +/- 0.005	18.610 +/- 0.005	18.617 +/- 0.005	18.619 +/- 0.005
F439W	20.076 +/- 0.003	20.111 +/- 0.002	20.118 +/- 0.002	20.120 +/- 0.002
F450W	21.173 +/- 0.005	21.207 +/- 0.005	21.215 +/- 0.005	21.216 +/- 0.005
F467M	19.107 +/- 0.005	19.142 +/- 0.005	19.149 +/- 0.004	19.151 +/- 0.004
F547M	20.832 +/- 0.004	20.852 +/- 0.003	20.871 +/- 0.003	20.867 +/- 0.003
F555W	21.726 +/- 0.003	21.745 +/- 0.001	21.765 +/- 0.001	21.761 +/- 0.001
F569W	21.398 +/- 0.004	21.417 +/- 0.003	21.436 +/- 0.003	21.432 +/- 0.003
F606W	22.062 +/- 0.004	22.081 +/- 0.002	22.101 +/- 0.002	22.096 +/- 0.002
F622W	21.534 +/- 0.006	21.580 +/- 0.006	21.589 +/- 0.006	21.566 +/- 0.006
F675W	21.224 +/- 0.003	21.270 +/- 0.001	21.279 +/- 0.002	21.256 +/- 0.002
F702W	21.619 +/- 0.004	21.665 +/- 0.003	21.674 +/- 0.003	21.651 +/- 0.003
F785LP	19.879 +/- 0.005	19.889 +/- 0.004	19.895 +/- 0.004	19.887 +/- 0.004
F791W	20.679 +/- 0.006	20.690 +/- 0.005	20.695 +/- 0.005	20.688 +/- 0.005
F814W	20.839 +/- 0.002	20.850 +/- 0.001	20.855 +/- 0.001	20.848 +/- 0.001
F850LP	19.141 +/- 0.005	19.152 +/- 0.005	19.158 +/- 0.005	19.150 +/- 0.005
F1042M	15.367 +/- 0.002	15.378 +/- 0.001	15.383 +/- 0.001	15.376 +/- 0.001

note: WFPC2mag = -2.5 log (DN/s) + ZP(FG) - CTE
ZP(FG) from above tables
CTE calculated from above equations

UBVRI Transformations

GAIN=7

Filter SMAG SCOL ZP(PC1) ZP(WFC2) ZP(WFC3) ZP(WFC4) T1 T2 Cmin Cmax

F380W B (B-V) 20.977 21.007 21.034 21.012 -0.581 0.777 ... 0.5

F380W B (B-V) 21.329 21.359 21.386 21.364 -0.943 0.103 0.5 ...

F410M B (B-V) 19.634 19.664 19.690 19.668 -0.183 -0.287 ... ...

F439W B (U-B) 20.812 20.842 20.869 20.846 -0.103 -0.046 ... ...

F439W B (B-V) 20.825 20.855 20.882 20.859 0.003 -0.088 ... ...

F439W B (B-R) 20.819 20.849 20.876 20.853 0.019 -0.049 ... ...

F439W B (B-I) 20.822 20.852 20.879 20.856 0.005 -0.023 ... ...

F450W B (B-V) 21.923 21.953 21.980 21.958 0.230 -0.003 ... ...

F467M B (B-V) 19.863 19.893 19.920 19.897 0.480 -0.299 ... 0.5

F467M B (B-V) 19.814 19.844 19.871 19.848 0.432 -0.002 0.5 ...

F547M V (B-V) 21.552 21.599 21.623 21.577 0.031 -0.039 ... 1.0

F547M V (B-V) 21.504 21.551 21.575 21.529 0.056 -0.016 1.0 ...

F547M V (V-I) 21.552 21.599 21.623 21.577 0.027 -0.032 ... 1.1

F547M V (V-I) 21.504 21.551 21.575 21.529 0.049 -0.013 1.1 ...

F555W V (U-V) 22.432 22.479 22.503 22.457 -0.014 0.005 ... ...

F555W V (B-V) 22.451 22.498 22.522 22.476 -0.060 0.033 ... ...

F555W V (V-R) 22.456 22.503 22.527 22.481 -0.121 0.120 ... ...

F555W V (V-I) 22.451 22.498 22.522 22.476 -0.052 0.027 ... ...

F569W V (V-I) 22.120 22.167 22.191 22.146 0.089 -0.003 ... 2.0

F569W V (V-I) 22.452 22.499 22.523 22.478 -0.125 0.022 2.0 ...

F606W V (B-V) 22.796 22.843 22.866 22.821 0.293 0.015 ... 1.7

F606W V (B-V) 23.586 23.633 23.656 23.611 -0.284 0.081 1.7 ...

F606W V (V-I) 22.796 22.843 22.866 22.821 0.254 0.012 ... 2.0

F606W V (V-I) 23.586 23.633 23.656 23.611 -0.247 0.065 2.0 ...

F622W R (V-R) 22.317 22.342 22.347 22.314 -0.252 -0.111 ... ...

F675W R (U-R) 22.014 22.038 22.043 22.010 0.039 -0.007 ... ...

F675W R (B-R) 21.995 22.019 22.024 21.991 0.092 -0.017 ... ...

F675W R (V-R) 21.994 22.018 22.023 21.990 0.253 -0.125 ... ...

F675W R (R-I) 21.985 22.009 22.014 21.981 0.273 -0.066 ... ...

F702W R (V-R) 22.394 22.418 22.423 22.390 0.343 -0.177 ... 0.6

F702W R (V-R) 22.272 22.296 22.301 22.268 0.486 -0.079 0.6 ...

F785LP I (V-I) 20.596 20.642 20.659 20.617 0.091 0.020 ... ...

F791W I (V-I) 21.394 21.440 21.456 21.414 -0.029 -0.004 ... 1.0

F791W I (V-I) 21.435 21.481 21.497 21.455 -0.084 0.011 1.0 ...

F814W I (U-I) 21.530 21.575 21.592 21.550 -0.018 0.002 ... ...

F814W I (B-I) 21.550 21.595 21.612 21.570 -0.031 0.007 ... ...

F814W I (V-I) 21.554 21.599 21.616 21.574 -0.062 0.025 ... ...

F814W I (R-I) 21.554 21.599 21.616 21.574 -0.112 0.084 ... ...

F850LP I (V-I) 19.838 19.884 19.901 19.859 0.160 0.023 ... ...

F1042M I (V-I) 16.029 16.074 16.091 16.049 0.350 0.022 ... ...

Filter	SMAG	SCOL	ZP(PC1)	ZP(WFC2)	ZP(WFC3)	ZP(WFC4)	T1	T2	Cmin	Cmax
F380W	B	(B-V)	20.977	21.007	21.034	21.012	-0.581	0.777	...	0.5
F380W	B	(B-V)	21.329	21.359	21.386	21.364	-0.943	0.103	0.5	...
F410M	B	(B-V)	19.634	19.664	19.690	19.668	-0.183	-0.287	...	...
F439W	B	(U-B)	20.812	20.842	20.869	20.846	-0.103	-0.046	...	...
F439W	B	(B-V)	20.825	20.855	20.882	20.859	0.003	-0.088	...	...
F439W	B	(B-R)	20.819	20.849	20.876	20.853	0.019	-0.049	...	...
F439W	B	(B-I)	20.822	20.852	20.879	20.856	0.005	-0.023	...	...
F450W	B	(B-V)	21.923	21.953	21.980	21.958	0.230	-0.003	...	...
F467M	B	(B-V)	19.863	19.893	19.920	19.897	0.480	-0.299	...	0.5
F467M	B	(B-V)	19.814	19.844	19.871	19.848	0.432	-0.002	0.5	...
F547M	V	(B-V)	21.552	21.599	21.623	21.577	0.031	-0.039	...	1.0
F547M	V	(B-V)	21.504	21.551	21.575	21.529	0.056	-0.016	1.0	...
F547M	V	(V-I)	21.552	21.599	21.623	21.577	0.027	-0.032	...	1.1
F547M	V	(V-I)	21.504	21.551	21.575	21.529	0.049	-0.013	1.1	...
F555W	V	(U-V)	22.432	22.479	22.503	22.457	-0.014	0.005	...	...
F555W	V	(B-V)	22.451	22.498	22.522	22.476	-0.060	0.033	...	...
F555W	V	(V-R)	22.456	22.503	22.527	22.481	-0.121	0.120	...	...
F555W	V	(V-I)	22.451	22.498	22.522	22.476	-0.052	0.027	...	...
F569W	V	(V-I)	22.120	22.167	22.191	22.146	0.089	-0.003	...	2.0
F569W	V	(V-I)	22.452	22.499	22.523	22.478	-0.125	0.022	2.0	...
F606W	V	(B-V)	22.796	22.843	22.866	22.821	0.293	0.015	...	1.7
F606W	V	(B-V)	23.586	23.633	23.656	23.611	-0.284	0.081	1.7	...
F606W	V	(V-I)	22.796	22.843	22.866	22.821	0.254	0.012	...	2.0
F606W	V	(V-I)	23.586	23.633	23.656	23.611	-0.247	0.065	2.0	...
F622W	R	(V-R)	22.317	22.342	22.347	22.314	-0.252	-0.111	...	...
F675W	R	(U-R)	22.014	22.038	22.043	22.010	0.039	-0.007	...	...
F675W	R	(B-R)	21.995	22.019	22.024	21.991	0.092	-0.017	...	...
F675W	R	(V-R)	21.994	22.018	22.023	21.990	0.253	-0.125	...	...
F675W	R	(R-I)	21.985	22.009	22.014	21.981	0.273	-0.066	...	...
F702W	R	(V-R)	22.394	22.418	22.423	22.390	0.343	-0.177	...	0.6
F702W	R	(V-R)	22.272	22.296	22.301	22.268	0.486	-0.079	0.6	...
F785LP	I	(V-I)	20.596	20.642	20.659	20.617	0.091	0.020	...	...
F791W	I	(V-I)	21.394	21.440	21.456	21.414	-0.029	-0.004	...	1.0
F791W	I	(V-I)	21.435	21.481	21.497	21.455	-0.084	0.011	1.0	...
F814W	I	(U-I)	21.530	21.575	21.592	21.550	-0.018	0.002	...	...
F814W	I	(B-I)	21.550	21.595	21.612	21.570	-0.031	0.007	...	...
F814W	I	(V-I)	21.554	21.599	21.616	21.574	-0.062	0.025	...	...
F814W	I	(R-I)	21.554	21.599	21.616	21.574	-0.112	0.084	...	...
F850LP	I	(V-I)	19.838	19.884	19.901	19.859	0.160	0.023	...	...
F1042M	I	(V-I)	16.029	16.074	16.091	16.049	0.350	0.022	...	...

GAIN=14

Filter SMAG SCOL ZP(PC1) ZP(WFC2) ZP(WFC3) ZP(WFC4) T1 T2 Cmin Cmax

F380W B (B-V) 20.228 20.263 20.271 20.272 -0.581 0.777 ... 0.5

F380W B (B-V) 20.580 20.615 20.623 20.624 -0.943 0.103 0.5 ...

F410M B (B-V) 18.885 18.920 18.927 18.929 -0.183 -0.287 ... ...

F439W B (U-B) 20.063 20.098 20.105 20.107 -0.103 -0.046 ... ...

F439W B (B-V) 20.076 20.111 20.118 20.120 0.003 -0.088 ... ...

F439W B (B-R) 20.070 20.105 20.112 20.114 0.019 -0.049 ... ...

F439W B (B-I) 20.073 20.108 20.115 20.117 0.005 -0.023 ... ...

F450W B (B-V) 21.175 21.209 21.217 21.218 0.230 -0.003 ... ...

F467M B (B-V) 19.114 19.149 19.156 19.158 0.480 -0.299 ... 0.5

F467M B (B-V) 19.065 19.100 19.107 19.109 0.432 -0.002 0.5 ...

F547M V (B-V) 20.827 20.847 20.866 20.862 0.031 -0.039 ... 1.0

F547M V (B-V) 20.779 20.799 20.818 20.814 0.056 -0.016 1.0 ...

F547M V (V-I) 20.827 20.847 20.866 20.862 0.027 -0.032 ... 1.1

F547M V (V-I) 20.779 20.799 20.818 20.814 0.049 -0.013 1.1 ...

F555W V (U-V) 21.707 21.726 21.746 21.742 -0.014 0.005 ... ...

F555W V (B-V) 21.726 21.745 21.765 21.761 -0.060 0.033 ... ...

F555W V (V-R) 21.731 21.750 21.770 21.766 -0.121 0.120 ... ...

F555W V (V-I) 21.726 21.745 21.765 21.761 -0.052 0.027 ... ...

F569W V (V-I) 21.396 21.415 21.434 21.430 0.089 -0.003 ... 2.0

F569W V (V-I) 21.728 21.747 21.766 21.762 -0.125 0.022 2.0 ...

F606W V (B-V) 22.071 22.090 22.110 22.105 0.293 0.015 ... 1.7

F606W V (B-V) 22.861 22.880 22.900 22.895 -0.284 0.081 1.7 ...

F606W V (V-I) 22.071 22.090 22.110 22.105 0.254 0.012 ... 2.0

F606W V (V-I) 22.861 22.880 22.900 22.895 -0.247 0.065 2.0 ...

F622W R (V-R) 21.548 21.594 21.603 21.580 -0.252 -0.111 ... ...

F675W R (U-R) 21.244 21.290 21.299 21.276 0.039 -0.007 ... ...

F675W R (B-R) 21.225 21.271 21.280 21.257 0.092 -0.017 ... ...

F675W R (V-R) 21.224 21.270 21.279 21.256 0.253 -0.125 ... ...

F675W R (R-I) 21.215 21.261 21.270 21.247 0.273 -0.066 ... ...

F702W R (V-R) 21.624 21.670 21.679 21.656 0.343 -0.177 ... 0.6

F702W R (V-R) 21.502 21.548 21.557 21.534 0.486 -0.079 0.6 ...

F785LP I (V-I) 19.882 19.892 19.898 19.890 0.091 0.020 ... ...

F791W I (V-I) 20.679 20.690 20.695 20.688 -0.029 -0.004 ... 1.0

F791W I (V-I) 20.720 20.731 20.736 20.729 -0.084 0.011 1.0 ...

F814W I (U-I) 20.815 20.826 20.831 20.824 -0.018 0.002 ... ...

F814W I (B-I) 20.835 20.846 20.851 20.844 -0.031 0.007 ... ...

F814W I (V-I) 20.839 20.850 20.855 20.848 -0.062 0.025 ... ...

F814W I (R-I) 20.839 20.850 20.855 20.848 -0.112 0.084 ... ...

F850LP I (V-I) 19.123 19.134 19.140 19.132 0.160 0.023 ... ...

F1042M I (V-I) 15.314 15.325 15.330 15.323 0.350 0.022 ... ...

Filter	SMAG	SCOL	ZP(PC1)	ZP(WFC2)	ZP(WFC3)	ZP(WFC4)	T1	T2	Cmin	Cmax
F380W	B	(B-V)	20.228	20.263	20.271	20.272	-0.581	0.777	...	0.5
F380W	B	(B-V)	20.580	20.615	20.623	20.624	-0.943	0.103	0.5	...
F410M	B	(B-V)	18.885	18.920	18.927	18.929	-0.183	-0.287	...	...
F439W	B	(U-B)	20.063	20.098	20.105	20.107	-0.103	-0.046	...	...
F439W	B	(B-V)	20.076	20.111	20.118	20.120	0.003	-0.088	...	...
F439W	B	(B-R)	20.070	20.105	20.112	20.114	0.019	-0.049	...	...
F439W	B	(B-I)	20.073	20.108	20.115	20.117	0.005	-0.023	...	...
F450W	B	(B-V)	21.175	21.209	21.217	21.218	0.230	-0.003	...	...
F467M	B	(B-V)	19.114	19.149	19.156	19.158	0.480	-0.299	...	0.5
F467M	B	(B-V)	19.065	19.100	19.107	19.109	0.432	-0.002	0.5	...
F547M	V	(B-V)	20.827	20.847	20.866	20.862	0.031	-0.039	...	1.0
F547M	V	(B-V)	20.779	20.799	20.818	20.814	0.056	-0.016	1.0	...
F547M	V	(V-I)	20.827	20.847	20.866	20.862	0.027	-0.032	...	1.1
F547M	V	(V-I)	20.779	20.799	20.818	20.814	0.049	-0.013	1.1	...
F555W	V	(U-V)	21.707	21.726	21.746	21.742	-0.014	0.005	...	...
F555W	V	(B-V)	21.726	21.745	21.765	21.761	-0.060	0.033	...	...
F555W	V	(V-R)	21.731	21.750	21.770	21.766	-0.121	0.120	...	...
F555W	V	(V-I)	21.726	21.745	21.765	21.761	-0.052	0.027	...	...
F569W	V	(V-I)	21.396	21.415	21.434	21.430	0.089	-0.003	...	2.0
F569W	V	(V-I)	21.728	21.747	21.766	21.762	-0.125	0.022	2.0	...
F606W	V	(B-V)	22.071	22.090	22.110	22.105	0.293	0.015	...	1.7
F606W	V	(B-V)	22.861	22.880	22.900	22.895	-0.284	0.081	1.7	...
F606W	V	(V-I)	22.071	22.090	22.110	22.105	0.254	0.012	...	2.0
F606W	V	(V-I)	22.861	22.880	22.900	22.895	-0.247	0.065	2.0	...
F622W	R	(V-R)	21.548	21.594	21.603	21.580	-0.252	-0.111	...	...
F675W	R	(U-R)	21.244	21.290	21.299	21.276	0.039	-0.007	...	...
F675W	R	(B-R)	21.225	21.271	21.280	21.257	0.092	-0.017	...	...
F675W	R	(V-R)	21.224	21.270	21.279	21.256	0.253	-0.125	...	...
F675W	R	(R-I)	21.215	21.261	21.270	21.247	0.273	-0.066	...	...
F702W	R	(V-R)	21.624	21.670	21.679	21.656	0.343	-0.177	...	0.6
F702W	R	(V-R)	21.502	21.548	21.557	21.534	0.486	-0.079	0.6	...
F785LP	I	(V-I)	19.882	19.892	19.898	19.890	0.091	0.020	...	...
F791W	I	(V-I)	20.679	20.690	20.695	20.688	-0.029	-0.004	...	1.0
F791W	I	(V-I)	20.720	20.731	20.736	20.729	-0.084	0.011	1.0	...
F814W	I	(U-I)	20.815	20.826	20.831	20.824	-0.018	0.002	...	...
F814W	I	(B-I)	20.835	20.846	20.851	20.844	-0.031	0.007	...	...
F814W	I	(V-I)	20.839	20.850	20.855	20.848	-0.062	0.025	...	...
F814W	I	(R-I)	20.839	20.850	20.855	20.848	-0.112	0.084	...	...
F850LP	I	(V-I)	19.123	19.134	19.140	19.132	0.160	0.023	...	...
F1042M	I	(V-I)	15.314	15.325	15.330	15.323	0.350	0.022	...	...

note: SMAG = -2.5 log (DN/s) + ZP(FS) + T1 SCOL + T2 SCOL^2 - CTE
ZP(FS), T1, and T2 from above tables
CTE calculated from above equations

References

"The Charge Transfer Efficiency and Calibration of WFPC2." Dolphin, A. E. PASP, 112, 1397

"WFPC2 Stellar Photometry with HSTphot." Dolphin, A. E. 2000, PASP, 112, 1383