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]