APT Bulk Target Ingest
JWST APT includes a capability to ingest a file containing fixed target information directly into the APT target section.
For programs involving a large number of targets, APT supports the ingest of catalogs or lists of targets and target information in various formats.
File Formats for Importing
The are 4 supported file formats:
- Whitespace Separated
- Comma Separated Values (CSV)
- Tab separated Values (TSV)
- Virtual Observatory Table (VOT)
Here is an example of a CSV file for fixed targets. (Solar sytem targets are not supported for bulk entry.)
# Name, RA, DEC, RA Uncertainty, Dec Uncertainty, RA PM, RA PM units, DEC PM, DEC PM units, Epoch, Annual Parallax, "Comments"
SDSS2346-0016,23 46 25.6700,-00 16 0.05,0.1,0.1,3.4, MAS/YR,1.0,MAS/YR,1989.9,,"From the Sloan Survey"
V-V1343-AQL,19 11 50,4 58 58,,,,,,,,,"This object is from SIMBAD"
HD76932,08 58 43.9300,-16 07 57.90,,,,,,,,,
There are several items to note about the format:
- Lines starting with a "#" are comment lines.
- The first line in the file (there can be other comment lines between this line and the data) contains the names of the columns; the column names in the file must be unique, and they are not case sensitive. The names above are the names that APT uses, but you can use other names for some columns and APT may properly interpret them (e.g. RA can be RA, Right Ascension, or R.A.) If you do not supply a column identification line, or if your column names cannot be interpretted by APT, you can manually assign the columns.
- You do not need to supply values for all of the APT fields (e.g. you can skip the RA Uncertainty field and populate it in APT after ingest).
- Each line must contain the exact same number of entries. For CSV format, you can use extra commas to represent missing data (e.g. for SDSS2346-0016, there is 1 comma between the Epoch and Comment to indicate that the Annual Parallax field is not populated. Note that for Whitespace and Tab separated, this method will not work (i.e. you cannot have extra whitespace or tabs to indicate blank fields).
- The coordinate fields can support multiple formats, as shown above. For RA, you can use 19 09 53.0 (no units), 16h 22m 31s (units), or 118.77170 (decimal degrees). For Dec, you can use 4 53 16 (no units), -17d 52m 44.0s (units), or 22.00137 (decimal degrees); note that you cannot use ' (minutes) or " (seconds) for the units.
- Note that text fields need to use double quotes (") and not single quotes (').
- To specify quotes within a text field, use double double quotes (e.g. "This will preserve the ""quote"" mark.")
- For some text field data, you will need to use quotes around the text. In Whitespace separated files, quotes are needed around all text fields that contain white space (e.g. "19 09 53.0"). In CSV files, quotes are needed if the text field contains a comma (e.g. "This object, from my list, is interesting").
Accessing the Importer
To ingest a target list into APT:
(a) go to the File Menu, Import, Import Targets, or
(b) select the Targets folder in the Tree Editor and click on the Import Targets in the APT window (or right click on the Targets folder and select Import Targets from the menu), or
(c) select the Fixed Targets folder in the Tree Editor and click on the Import Targets in the APT window (or right click on the Fixed Targets folder and select Import Targets from the menu).
These options are shown in Figure 1.
Assigning Column Names
After selecting the Importer, you need to select the file format, the file name, and the coordinate type (only equatorial is supported). See Figure 2. Once you select the file format, you will see the file format displayed. See Figure 2.
Also, the entry in the Annual Parallax column has an incorrect format. You may import a file with this type of error, although the object with the error will NOT be imported (but all the other targets will be). However, if all the entries in a given column are improperly formatted, the Importer will not accept the file for import.
With all the columns identified, click on the Import button to load the targets into APT.
Besides the Target Name, RA, and Dec, two other fields are required for a minimal, complete target specification and Category and Description. These fields will need to be entered manually as the importer will not populate these fields from the file.