docs: def predict(abg,date,obs=568):
      """Run GB's predict using an ABG file as input."""
      import orbfit
      import RO.StringUtil
      (ra,dec,a,b,ang) = orbfit.predict(abg,date,obs)
      obj['RA']=ra
      obj['DEC']=dec
      obj['dRA']=a
      obj['dDEC']=b
      obj['dANG']=ang
      return obj