Summary of DoPhot Object Types

Since our pipeline does "fixed position" photometry relative to a template image, all DoPhot object types codes are >10. The descriptions below are adapted from Appendix C of the DoPhot manual.

Type 11
A "perfect" star. Type 11 objects are used to compute the 7-parameter weighted-mean stellar shape used to extract photometric data from an image.

Type 12
The object is not as peaked as a star and has been classified as a "galaxy" and rejected from further consideration by the PLANET pipeline. (Note, you will generally only encounter this as "type 2" while working non-fixed positions runs over the template image.)

Type 13
A blend of 2 close stars, with the data being for one component of the pair. The final fit uses mean shape parameters for single stars determined from all type 11 objects on the image.

Type 14
Fit failed to converge on a 4-parameter fit based on the mean single-star shape. Photometry is unreliable.

Type 15
Not enough points with adequate S/N for a full 7-parameter fit, so a 4-parameter fit attempted and succeeded. Photometry is suspect, and may indicate image problems or that the object is not a star.

Type 16
Too few points with adequate S/N for even a 4-parameter fit with the mean Type 11 star shape. Not subtracted from the image.

Type 17
Object too faint for a full 7-parameter mean-star fit. No object classification is possible. The results are for a 4-parameter fit, and are reasonable only if the object really is a star.

Type 18
Object was "obliterated" becase it was determined to be saturated, either above the pre-set threshold or found to be flat-topped.


Return to the OSU PLANET Pipeline Instructions
Updated: 2008 April 2 [rwp]