Real astronomical objects vs. image artifacts

[hubble.leg...@gmail.com]

If you are unsure of what you are looking at, post your question here.

[hubble.leg...@gmail.com]

For observations with the Wide Field Planetary Camera 2 (WFPC2), an
excellent guide on image artifacts and anomalies that can appear in
WFPC2 images can be found here:

http://www.stsci.edu/hst/wfpc2/analysis/wfpc2_anomalies.html

[Brad Whitmore]

Another good reference for WFPC2 anomalies is the addendum listed in
FAQ # 5 under images.

http://hla.stsci.edu/hla_faq.html#Images5

There is a similar reference for the ACS listed under the same FAQ.