Absolute magnitude then equals the apparent magnitude an object would have if it were at a standard luminosity distance -LRB- NUMBER@1 parsecs , NUMBER@2 AU , or NUMBER@3 km depending on object type -RRB- away from the observer , in the absence of astronomical extinction .

In astronomy , absolute magnitude is the apparent magnitude , m , an object would have if it were at a standard luminosity distance away from us , in the absence of interstellar extinction .
