NAME:
  diamptoh
 PURPOSE:   (one line only)
  Compute asteroid absolute magnitude given diameter and V geometric albedo
 DESCRIPTION:
 CATEGORY:
  Astronomy
 CALLING SEQUENCE:
  hv = diamptoh(d,pv)
 INPUTS:
  d  - diameter of asteroid in kilometers
  pv - V-band geometric albedo
 OPTIONAL INPUT PARAMETERS:
 KEYWORD INPUT PARAMETERS:
 OUTPUTS:
  return value is the Hv (absolute magnitude)
 KEYWORD OUTPUT PARAMETERS:
 COMMON BLOCKS:
 SIDE EFFECTS:
 RESTRICTIONS:
 PROCEDURE:
 MODIFICATION HISTORY:
  Written by Marc W. Buie, Southwest Research Institute, 2014/05/19