^An object's distance from Earth can be determinded using قانون هابل: v=Ho is Hubble's constant (70±5 (km/s)/Mpc). The relative uncertainty Δd/d divided by the distance is equal to the sum of the relative uncertainties of the velocity and v=Ho
^"NGC 167". SIMBAD (بالإنجليزية). Centre de Données astronomiques de Strasbourg. Retrieved 2017-02-12.