hasTrumplerClass

Given a predicate that represents a relationship or action between entities, generate a one-sentence description explaining its meaning.  
# Instructions
Focus on describing the relationship, not the entities themselves. 
# Response Format
Begin the description with \' Indicates...\'

Predicate: hasTrumplerClass

Indicates that an astronomical object (typically a star cluster) is associated with a specific Trumpler classification describing its concentration, range of brightness, and richness.