What is *security_class* of a system?

EVE Technology and Research Center Third Party Developers
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6

Some systems have no security_class classification at all.

PS> Get-EveRoute -OriginSystemName 'new eden' -DestinationSystemName '4-HWWF' -RouteFlag shortest -ShowDetails -Parallel |where {!$_.security_class} |select route_index, name, security_class, security_status|ft

route_index name     security_class    security_status
----------- ----     --------------    ---------------
          1 New Eden                 0.260553807020187
         42 DAYP-G                  -0.392761290073395


PS> Get-EveSystemKills |select -ExpandProperty system_id|Get-EveSystem|where {!$_.security_class}|select name, security_class, security_status|ft

name    security_class    security_status
----    --------------    ---------------
Akidagi                 0.444938838481903
S-1LIO                 -0.100362598896027
Hasama                  0.271440237760544
WW-KGD                 -0.179159358143806
Hikkok…                 0.342755079269409
Aivonen                 0.377330243587494
Hykani…                  0.24685937166214
Pyneka…                 0.239632815122604
Reitsa…                 0.189510479569435
Tsuruma                 0.542633414268494
Kinakka                 0.415623009204865
XFBE-T                 -0.185925513505936
Uuhula…                 0.492079496383667
Uchomi…                 0.494726926088333
Kedama                   0.33846440911293
...