How to create Finding Charts for Service Mode
In general, a finding chart has to be attached to each OB. Exceptions are possible for some instruments, in which case this is specified in the instrument-specific rules, which can be found by selecting the instrument from the pull-down instrument selector menu in the upper right of this web page.
General Finding Chart Requirements
Regardless of the instrument, finding charts must have all the following characteristics:
- Clearly indicate the Observing Run ID.
- Clearly indicate the PI Name.
- Clearly indicate the OB Name or Target Name, as used in the OB to which it is attached.
- The target(s) position(s) must be clearly indicated.
- The entire instrument field-of-view must be shown.
- North and East must be clearly indicated.
- The scale must be indicated by drawing a bar and writing the bar length in arcseconds or arcminutes.
- The wavelength range of the image must be indicated. Whenever possible, finding charts should have similar central wavelength to observations (e.g. DSS charts are often inappropriate for IR observations, e.g. near the galactic equator).
- The images should be negative, i.e. dark objects on light background.
- The output files must be in JPEG format and their size must be less than 1 Mbyte.
- Positions of spectroscopic acquisition reference stars, if any, should be marked.
- Spectroscopic finding charts must indicate the slit(s) position(s) clearly (unless slits are aligned along the parallactic angle)
Please verify that finding charts have sufficient quality and resolution. This can be done using p2 by attaching the finding chart and then clicking on the "thumbnail" version to see the full size version displayed in your browser.
Please read the P2 finding chart tutorial for a detailed description on how to attach finding charts to OBs.
How to create finding charts
p2 Finding Chart Generation service
A Finding Chart Generation service, called p2fc, is integrated into p2. It allows the automated, non-interactive creation of finding charts for individual or multiple OBs at the push of a button for almost all of the current VLT and La Silla instruments that require finding charts. A detailed description and instructions for usage are available in the dedicated p2fc Finding Charts page.
A command line interface to p2fc is also available, via the Python p2api, allowing control over many of the characterisitics of the FC generation that are not possible in the single click implementation available in p2.
Other Finding Chart tools
Alternatively, valid finding charts can be produced with any software tool able to produce output files in JPEG format. For users who do not use the p2 finding chart generation service or instrument specific preparation tools like FIMS or KARMA, ESO recommends the use of the SkyCat-based finding chart tool. This tool provides another user-friendly interface to easily produce finding charts with the general characteristics described above.
Skycat, including the ESO Finding Chart Plugin, is now available from the ESO software repositories (see below), package name eso-skycat.
Additional rules for HAWK-I finding charts
In addition to the general Finding Chart requirements, the finding charts for HAWK-I must show a field of 11 arcmin x 11 arcmin or larger in case large observing offsets are defined, preferentially in the wavelength of your observations.
For FAST photometry the FoV corresponding to the detector windowing setup should be clearly marked.
Finding Charts for all HAWK-I modes, non-AO and AO observations, can be easily prepared by using the Finding Chart generation by button click within p2 as the most convenient option.
Note: If you are using the HAWKI_img_acq_(LGS)_Preset with the Alpha and Delta offset for the target different from (0,0), then the Finding Chart must show the field as it is at the end of the acquisition (i.e. after the telescope performed the offset for the target).