There are some object properties that are important in order to be able to use all the potential of VOSA and get reliable results.
- Object coordinates are necessary to be able to make VO searches (for properties or photometry). Most operations in which we search for information in VO catalogs have to be made in terms of the object coordinates (and some search radius around them). If the coordinates are not available, you won't be able to search the VO.
- Object distance is necessary to be able to calculate bolumetric luminosities from the model fit results and then use these luminosities in the HR diagram to try to get estimation of the mass and age.
- The value of the visual extinction, Av, is necessary to deredden the observed photometry.
You can upload all this information in your Input file if you know it, but VOSA also can help to find values for these object properties searching in VO catalogs.