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

nametext
secondary objectThe best observation of an object with multiple observation is called the primary object, and other observations are stored in the PhotoObjAll table and PhotoObj view as secondary objects.