Refining Transit Settings

User Guide

About Transit and Ephemeris

Using the Service:
  1. Accessing the Transit Service
  2. Build a Transit Prediction Query
  3. Viewing Predictions
  4. Refining Transit Settings
  5. Transit Algorithms
  6. Definitions of Transit Parameters
  7. Building a Transit Service Query by URL
  8. Usage Tips and Troubleshooting

The Settings menu allows you to specify a preference for both ephemeris selection and prediction algorithm, which will be applied to each subsequent transit prediction query. Your selections in this menu determine which values are required in the Transit Service Query Form.

The current settings display in red on the Transit Service Query Form tab at the bottom of the first pane. Click Edit to access the Settings menu.

Ephemeris Selection

This setting affects how your prediction query results are filtered on the Results tab. For example, selecting Most Precise will show only the results that have the the Most-Precise Flag activated (i.e. filtered on =1).

Use This... To Get This... Notes
Most Precise Ephemeris that results in the lowest propagated uncertainty in the requested observing window. Query results on the Results tab will be pre-filtered on the Most Precise column (i.e. only rows with a value of 1 in that column are displayed).
Exoplanet Archive Default Ephemeris from the archive's default set of parameters for the planet. (For more information about archive default parameters, see the FAQ.) Query results on the Results tab will be pre-filtered on the Default Parameters column (i.e. only rows with a value of 1 in that column are displayed).
All All available ephemerides.  
User Defined Custom ephemeris based on values input by the user. This setting is automatically applied when the values are entered in the User Defined area, either by manual input, or by searching for a Single Target and double-clicking on a reference in the results.

Prediction Algorithm Selection

Use This... To Do This... Notes
Try Both The service first tries the Transit Ephemeris algorithm. If there are insufficient parameters to make a prediction, it tries the Orbital Elements algorithm.  
Transit Ephemeris The service only uses the Transit Ephemeris algorithm. Transit Ephemeris was known as Transit Midpoint in previous versions of the service. The underlying calculations have not changed. See Transit Algorithms for details.
Orbital elements (i.e. epoch of periastron) The services only uses the Orbital Elements algorithm. Orbital Elements was known as Epoch of Periastron in previous versions of the Transit Service. The underlying calculations have not changed. See Transit Algorithms for details.

Target Visibility Settings

These settings allow you to specify the constraints to determine when your target(s) are considered observable.

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Last updated: 11 February 2020