APT ETC

User's Guide
Contents
Return to ETC
Welcome
SYNPHOT
SNR and Exposure Time
SNR
Time
Optimal SNR
Spectroscopy
Target Acquisition
Basic Use
Page Heirarchy
Reference
Extraction Regions
Spectral Distribution
User Spectra
Other Spectra
Extinction
Normalization
Background
CCD Parameters
ID Number
Calculations
SYNPHOT Calls
Call Descriptions
Call Parameters
NICMOS Spectroscopic Extraction Regions
Tables
Spectral Elements
NICMOS Filters
NICMOS Dispersers
ACS Filters and Dispersers
COS Dispersers
WFC3 Filters and Dispersers
STIS Filters and Dispersers
NICMOS Tables
COS Tables
STIS Tables and Topical Help
spacer

The ETC Request ID

For every calculation performed with the ETC, an ID is provided at the top of the output page.  Users who report problems or seek help on the use of this estimator should always provide this ID in their help request. Failure to provide it may make it impossible to properly resolve any problems.

 

The ETC ID can also be used to view the results produced by a previous request. On the ETC web pages, there is a link labeled Previous calculation results at the bottom of the menu area on the left side of the page. Clicking that link will take you to the page shown in Figure 1: Previous ETC Calculation Result. Enter the full ID as originally given into the Exposure ID field and click the "my previous ETC result" button.

 

graphic: request previous result by ID