ACS FAQs

Phase 1

Can I extend the proprietary period for my data? Answer
What overhead is required to change ACS detectors during an observing sequence? Answer
Are autoparallel observations allowed for ACS and what is their policy? Answer
Are there special policies for the use of SBC and parallel observations? Answer
Is there any target acquisition mode available? Answer
Are digital versions of the transmission curves available? Answer

How accurate are the ACS aperture overlays in the VTT? Answer
What are ACS subarrays? How can I use them? Answer
What guiding concerns should I have for my ACS observations? Answer
Why do I get serial buffer dumps in RPS2 and why does it take so long to process? Answer
How do POS-TARGs and patterns interact? Answer
Why does adding a WFPC2 coordinated parallel to an existing ACS/WFC result in large changes? Answer
Will a 9-degree moon avoidance angle gaurantee a zodi-limited background level? Answer
Is it OK to put a bright star in the gap between the two WFC chips? Answer
How well do integral pixel dithers in the WFC work? Answer
What is the offset in the U2 direction that can be taken before a gap appears? Answer
What aperture should I use for large mosaics? Answer
Can I add WFPC2 coordinated parallels to my ACS observations? Answer
What are the current ACS/WFC aperture parameters? Answer
Dithering for hot pixels Answer
What are the minimum and maximum length of an exposure with each detector? Answer
How do I change the configuration from my Phase I submission? Answer

What is the meaning of the 2x2 resolution element in the ACS ETC for an extended source? What do I do if my source is larger than the 2x2 element? Answer
Are digital versions of the transmission curves available? Answer
What do "counts" mean in the ACS Instrument Handbook? Answer
What are N_pix, epsilon_f and epsilon_f(1)? Answer
What is (epsilon_Nspix)' and how is the spectroscopic S/N calculated? Answer
How can I maximize SNR when observing a faint diffuse target in the UV with the SBC? Answer
How do I use the ETC for an emission-line source? Answer
Will binning be available for the CCDs? Answer