SkyServer: Table Descriptions
Table Descriptions
DR7 Help
 Site News
 Cooking with Sloan
 Search Form Guide
 SQL Tutorial
 SQL in SkyServer
 Sample SQL Queries
 Query Limits
 Searching Advice
 Archive Intro
 Table Descriptions
 Schema Browser
 Web Browsers
 Data Publications
 SkyServer Sites
 Contact Help Desk

UnknownPhotoThis view contains only those primary photometric objects classified as unknown (not a star,galaxy,or sky). As such, it is a view of PhotoPrimary, which is itself a view of PhotoObjAll.