| name | value | description |
| UNKNOWN | 0 | Unknown: Object type is not known. |
| COSMIC_RAY | 1 | Cosmic-ray track (not used). |
| DEFECT | 2 | Defect: Object is caused by a defect in the telescope or processing pipeline. (not used) |
| GALAXY | 3 | Galaxy: An extended object composed of many stars and other matter. |
| GHOST | 4 | Ghost: Object created by reflected or refracted light. (not used) |
| KNOWNOBJ | 5 | KnownObject: Object came from some other catalog (not the SDSS catalog). (not yet used) |
| STAR | 6 | Star: A a self-luminous gaseous celestial body. |
| TRAIL | 7 | Trail: A satellite or asteriod or meteor trail. (not yet used) |
| SKY | 8 | Sky: Blank sky spectogram (no objects in this arcsecond area). |
| NOTATYPE | 9 | NotAType: |