HST Duplication Checking
Use this page to check for duplications with your HST proposal.
This form will check for possible duplications with your proposal.
An observation is reported as a possible duplication if:
- it comes from a proposal other than the one you're checking;
- it is within 5 arcminutes of one of your observations;
- it uses the same instrument as your observation;
- it has been or will be executed in proposal cycles 7 through 16.
Please note: This interface does not yet contain the cycle 17 GTO reserved targets. For Cycle 17 GTO and ERS targets, please see the following pages:
The COS GTO Science Programs
The WFC3 Early Release Science Program
You may do more complex duplication-checking using the HST Duplication Checking form,
or with the Proposed and Archived Exposures Catalog.
There is also a help page for these forms.