What are the current ACS/WFC aperture parameters?

Reply:The ACS Instrument Handbook table 8.1 is updated below updated with the current WFC aperture parameters. Please especially note the updates for the WFC1-IRAMP and WFC2-ORAMP reference pixel and reference V2,V3 entries.

***Table 8.1: WFC Aperture Parameters***
Aperture Name active area	Extent (arcsec)	Reference pixel	Reference V2,V3 (arcsec)	x-axis angle	y-axis angle
Aperture Name active area	Extent (arcsec)	Reference pixel	Reference V2,V3 (arcsec)	(degrees from V3 through V2)
`WFC`4096 × 4096	202 × 202	(2072,200) on WFC1	(258,239)	92.2	177.5
`WFC-FIX`4096 × 4096	202 × 202	(2072, 200)	(259,239)	92.2	177.5
`WFCENTER`4096 × 4096	202 × 202	(2114, 2029)	(261,252)	92.1	177.5
`WFC1`4096 × 2048	202 × 102	(2072, 1024)	(261,198)	92.5	177.3
`WFC1-FIX`4096 × 2048	202 × 102	(2072, 1024)	(261,198)	92.5	177.3
`WFC2`4096 × 2048	202 × 102	(2072, 1024)	(257,302)	91.7	177.8
`WFC2-FIX`4096 × 2048	202 × 102	(2072, 1024)	(257,302)	91.7	177.8
`WFC1-IRAMP`600 × 1500	45 × 85	(680,1325)	(194,187)	93.1	176.6
`WFC1-MRAMP`600 × 1500	65 × 100	(3096,1024)	(312,196)	92.2	177.8
`WFC2-MRAMP`600 × 150	65 × 100	(1048,1024)	(206,303)	91.9	177.5
`WFC2-ORAMP`600 × 1500	60 × 85	(3494,708)	(328,316)	91.4	178.2
`WFC1-SMFL`1024 × 1024	72 × 72	(3096,1024)	(312,196)	92.2	177.8
`WFC2-SMFL`1024 × 1024	72 × 72	(1048,1024)	(206,304)	91.9	177.5