  Photometric characteristics for all models of Starlink satellites launched to
date are reviewed. The Original design that lacked brightness mitigation is the
most luminous. SpaceX installed a sunshade on the VisorSat model which reduced
its luminosity by a factor of 3. The visor was omitted on Post-VisorSat
spacecraft with laser communication which followed, but the company added a
reflective layer which resulted in an intermediate brightness between Original
and VisorSat. SpaceX is applying advanced brightness mitigation techniques to
their Generation 2 Starlink satellites which are larger. The first of these,
called Minis, are dimmer than Gen 1 Starlinks despite their greater size.
Photometric observations verify that brightness mitigation efforts employed by
SpaceX reduce spacecraft luminosity substantially. However, the satellites
still have some negative impact on astronomical observations and the very large
satellites planned for later in Gen 2 may interfere more seriously.
