Tutorial

Access Rights

The archive browser can be used without logging in but only public data and reference files will be available for download in that case. It is therefore recommended to log in before performing any searches relating to private (proprietary) data.
Generally all data matching a query are shown however private (proprietary) data belonging to another user will not have a download option. Similarly, L0 Files can only be downloaded by a recognised instrument team member.
If there is no checkbox next to an entry after clicking on a result in the results page, this means that you have no access rights to this data or are not correctly logged in.

Target Resolver

The CHEOPS Archive Browser provides a target resolver. Start typing to activate the automatic suggestion based on available target names in the Mission Archive. Once you click the “Resolve” button, the tool will try to resolve the Target Name to derive the target’s RA and DEC values, first using the Mission Archive and then SIMBAD.
Note: The consecutive query to the Mission Archive will not use the Target Name itself but only the RA and DEC values.

Filtering Options

The CHEOPS Archive Browser filtering page provides the CHEOPS science community with different options by which to query the CHEOPS Archive for CHEOPS mission product data. There are three different query tabs in which users can set up archive queries:

• Target and Observation Based Query containing two forms which can be combined:
  • Target Based
  • Observation Request Based
• Reference Data Query containing:
  • Reference File Based
• L0 Data query containing:
  • L0 File Based

After setting up the filters, users need to click on the Submit button to initiate the archive query. Clicking on the Reset button clears all filters of the selected query tab.

Results Page

After the successful submission and execution of the archive query, the results page will display the list of all products found in the CHEOPS Archive that match the entered filter options. The results page comprises a formatted table, where products are grouped by visit.

• Results table options

Download Pop-up

The download pop-up window lists all products from a visit and comes up when a visit ID link from the query results table is clicked on. The window contains a formatted table listing the individual products.

• Download table options

Login Widget

The login widget presented on the right hand side of the CHEOPS Archive Browser home page enables registered users to log in (and log out). Login credentials are provided by the CHEOPS SOC. All questions regarding archive accounts should be sent to the following email address: cheops-pso@unige.ch.

SOC notes

Information about the CHEOPS data releases is available in the SOC notes.

Publication Guidelines

When using/publishing CHEOPS data, authors are asked to follow the official publication guidelines:
https://www.cosmos.esa.int/web/cheops-guest-observers-programme/publication-guidelines

Using CHEOPS data for the first time

Every space mission and ground based telescope has different science data needs. The CHEOPS Data is described in the CHEOPS Observers Manual. This section is intended to point the reader to the most important concepts to simplify the first steps with CHEOPS data.

Data Format

The data format is explained in CHEOPS Observers Manual, Ch3 and in more detail in the Data Product Description Document Annex B, which can be downloaded here.

Science Data

The data is in FITS format and the most important files are:

• SCI_COR_Lightcurve (extracted LC by the DRP in different apertures; One file per aperture)
• SCI_RAW/CAL/COR_FullArray (single full frame image)
• SCI_RAW/CAL/CAL_SubArray (image cube 200×200 px, plus metadata tables):
  • SCI_RAW/CAL/COR_ImageMetadata
  • SCI_RAW/CAL/COR_UnstackedImageMetadata
• SCI_RAW/CAL/COR_Imagette (image cube of imagette images. Only available for high cadence observations of bright targets. plus metadata):
  • SCI_RAW/CAL/COR_ImagetteMetadata
  • SCI_RAW_HkCentroid
  • SCI_RAW_Attitude

Reference Files

The archive also serves the reference files, which give important calibration data most of which are used by the DRP. They are:

• EXT_APP_DE1
• EXT_PRE_StarCatalogue
• REF_APP_BadPixelMap
• REF_APP_BiasFrame
• REF_APP_DarkFrame
• REF_APP_FlatField
• REF_APP_WhitePSF
• REF_APP_OversampledWhitePSF
• REF_APP_CCDLinearisation
• REF_APP_GainCorrection
• REF_APP_Throughput
• REF_APP_SED
• REF_APP_PixelScale
• REF_APP_QE
• REF_APP_Limits-ScienceHk
• REF_APP_ObtReset

A description of the contents of each of FITS files can be found in the Data Product Description Document.

Further reading

Please also check out the following resources at ESA:

• https://www.cosmos.esa.int/web/cheops-guest-observers-programme/cheops-data

 

CHEOPS Archive Browser Version: 14.3.0