How to create Finding Charts for Service Mode
In general, a finding chart has to be attached to each OB. Exceptions are given in the instrument-specific rules. Please read the P2PP3 User Manual for a detailed description on attaching finding charts to OBs. There also exists a video tutorial on this topic.
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 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 parallactic angle)
Please verify that finding charts have sufficient quality and resolution. This can be easily done from within P2PP by using the View Finding Chart option in the Finding Charts menu of the main P2PP interface (see also the P2PP User Manual).
Skycat Finding Chart tool
Although in most cases valid finding charts can be produced with any software tool able to produce output files in JPEG format, ESO recommends the use of the SkyCat-based finding chart tool. This tool provides a user-friendly interface to easily produce finding charts with the general characteristics described above.
Additional rules for NACO finding charts
In addition to the general requirements for finding charts, the following recommendations should be fulfilled:
- Starting with Period 81, at least one chart for each observation must be 2' x 2' in size, with additional charts showing more detail as appropriate.
- All wavefront reference objects must be clearly marked and numbered according to the way they have been ordered in the preparation software. They should be marked R1, R2, R3, etc.
- For imaging observations the field of view of the selected camera must be drawn.
- For polarimetric (only offered with the Wollaston) and coronagraphic observations, the field of view of the S27 or L27 cameras (28 x 28 arcseconds) must be drawn. Additionally, the target that is to be placed behind the mask (for coronagraphy) or centered within the transparent regions of the polarimetric mask must be clearly marked.
- For long slit spectroscopy, the slit must be drawn.
- For spectroscopic templates, the reference star used for preliminary slit centering must be marked and identified.
- For APP imaging the position angle with respect of the fixed orientation of the APP pattern must be shown.
- For LGS in SE mode, this should be explicitly indicated.
- For LGS observation, the position of the Tip Tilt star should be clearly marked.
- Under special circumstances the Finding Charts can be skipped by a Phase 2 Waiver Request.